Leg : 61 Top/Bottom Interval(mm): 40/ 70 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 563.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 564.56 Sect/Pc #: 2/PCE 1
ROCK = APHYRIC TO MODERATELY MICROPHYRIC BASALT
SHARP CONTACT BETWEEN APHYRIC BASALT AND
MODERATELY MICROPHYRIC BASALT,ROCK IS 80% ALTERED;
Texture: APHYRIC-MODERATELY MICROPHYRIC,INTERSERTAL;
Where sampled: CHILLED SILL MARGIN
TOP MARGIN OF SILL*
Phenocrysts- OLIVINE ( 0%)
IN MODERATELY MICROPHYRIC PART;
OLIVINE ( 0%)
Size(mm): .05X0.6
IN APHYRIC PART;
PLAGIOCLASE ( 2.6%)
Morphology: ELONGATE PRISMS
MICROPHENOS IN MODERATELY MICROPHYRIC PART,
AVERAGE DIMENSIONS = 0.05 X 0.6 MM,APPROX COMP
AN65-45 (QUESTIONABLE),THIN MARGIN ENVELOPES ARE
MORE ACIDIC;
PLAGIOCLASE ( TR%)
Size(mm): 0.05X0.6 Morphology: ELONGATE PRISMS
MICROPHENOS IN APHYRIC PART,AVERAGE DIMENSIONS =
0.05 X 0.6 MM,APPROX COMP AN65-45 (QUESTIONABLE),
THIN MARGINAL ENVELOPES ARE MORE ACIDIC;
CLINOPYROXENE ( 2%)
Size(mm): 0.5 Morphology: EQUIDIMENSIONAL
MICROPHENOS IN MODERATELY MICROPHYRIC PART,0.5 MM
ACROSS;
CLINOPYROXENE ( TR%)
Size(mm): 0.5 Morphology: EQUIDIMENSIONAL
MICROPHENOS IN APHYRIC PART,0.5 MM ACROSS;
MAGNETITE ( 0.4%)
Size(mm): 0.6
MICROPHENOS IN MODERATELY MICROPHYRIC PART,0.6 MM
ACROSS,DEEPLY ALTERED TO DARK BROWN OXIDES;
MAGNETITE ( 0%)
Size(mm): 0.6
IN APHYRIC PART*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE
ALTERED MICROLITES,APPROX COMP AN32-65;
CLINOPYROXENE
Morphology: EQUIDIMENSIONAL
ALTERED;
MAGNETITE ( 10%)
Size(mm): <0.04 Morphology: DUST-LIKE
ALTERED PARTLY TO HYDROXIDES;
GLASS ( >70%)
ALTERED*
Alteration - CARBONATE
Location: VEIN INTERIOR
COLLOFORM AGGREGATES;
CLAY MINERALS
Location: VEIN MARGINS, Replacing: GLASS,GROUNDMASS
Location: GROUNDMASS
BRIGHT GREEN IN VEINS AND PALE GREEN IN
GROUNDMASS;
PYRITE
Location: VEIN MARGINS
ALTERED TO HYDROXIDES;
OTHER
MAGN DEEPLY ALTERED TO DARK BROWN HYDROXIDES;
HYDROXIDE
Vesicles -
Percent: 0
Leg : 61 Top/Bottom Interval(mm): 290/ 320 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 563.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 564.81 Sect/Pc #: 2/PCE 3A
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,INTERGRANULAR-DIABASIC;
Where sampled: INTERIOR OF SILL*
Phenocrysts- PLAGIOCLASE
Size(mm): 0.8-1.0 Morphology: LATHS
HEAVILY ALTERED*
Groundmass - PLAGIOCLASE ( 27%)
Size(mm): 0.1-0.5
APPROX COMP AN80 ZONED TO AN38,HEAVILY ALTERED;
CLINOPYROXENE ( 25%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL-EUHEDRAL
AUGITE,2VZ= 40;
MAGNETITE ( 10%)
Size(mm): 0.004-0.08 Morphology: EUHEDRAL
TI-MAGN,COLORLESS;
GLASS ( 0%)
QUARTZ ( <1%)
Size(mm): 0.1 Morphology: ANHEDRAL
WITH APATITE INCLUSIONS*
Alteration - CLAY MINERALS ( 3%)
BROWN;
CHLORITE ( 35%)
Replacing: PLAG,CPX
Leg : 61 Top/Bottom Interval(mm): 440/ 480 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 566.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 566.96 Sect/Pc #: 1/PCE 2A
ROCK = APHYRIC BASALT
HIGHLY ALTERED,ALTERATION VEIN PRESENT,TOTAL
ALTERATION PRODUCTS= 35%;
Texture: APHYRIC,INTERGRANULAR-DIABASIC;
Where sampled: SILL INTERIOR*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.3
APPROX COMP AN50 ZONED TO ?;
CLINOPYROXENE ( 20%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL
CLEAR AND HEAVILY REPLACED (AMOST TOTALLY) BY
GREEN CLAY AND CHLORITE (IN THAT ORDER);
MAGNETITE ( 15%)
OTHER ( 35%)
ALTERATION PRODUCTS*
Alteration - COMBINATION ( 35%)
Location: VEINS Replacing: PYX
INCLUDES CARB + CLAY MINS (BROWN AND GREEN--GREEN
CLAY REPLACES PYX) + ZEOLITES + CHLORITE (REPLACES
PYX AFTER GREEN CLAY) + FE AND MN OXIDES +
HYDROXIDES
CARBONATE
Location: VEINS
CLAY MINERALS
Location: VEINS
ZEOLITE
Location: VEINS
FERROUS OXIDE
Location: VEINS
MANGANESE OXIDE
Location: VEINS
HYDROXIDE
Location: VEINS
Leg : 61 Top/Bottom Interval(mm): 1170/1200 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 566.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 567.69 Sect/Pc #: 1/PCE 2G
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,DIABASIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1-0.5
APPROX COMP AN70 TO AN50;
CLINOPYROXENE ( 45%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL
AUGITE,LIGHT GREENISH BROWN IN COLOR;
MAGNETITE ( 10%)
Size(mm): 0.05-0.2
TI-MAGN,DOES NOT INCLUDE THE DUST-LIKE MAGN FOUND
WITH CLAY + ZEOLITES IN ALTERED ZONES*
Alteration - COMBINATION ( 25%)
Replacing: CPX
INCLUDES CLAY MINS (GREEN AND BROWN) + ZEOLITES
(FIBROUS WITH LOW RELIEF) + MAGN DUST;
CLAY MINERALS
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 60/ 90 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 566.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 568.08 Sect/Pc #: 2/PCE 1
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,DIABASIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.3-0.5 Morphology: ANHEDRAL
STRANGELY ZONED,APPROX COMP AN80*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1-0.4
APPROX COMP AN77 ZONED TO AN36;
CLINOPYROXENE ( 70%)
Size(mm): 0.1-0.5
AUGITE,2VZ= 55,HALF OF CPX ALTERED TO GREEN CLAY;
MAGNETITE ( 10%)
Size(mm): 0.005-0.2
TI-MAGN,ALSO FINE GRAINED MAGN ASSOCIATED WITH
GREEN CLAY*
Alteration - CLAY MINERALS ( 35%)
Replacing: CPX
GREEN;
CALCITE ( <1%)
Location: GROUNDMASS Replacing: PLAG,CPX
COMBINATION
Location: VEIN
INCLUDES 1)CALCITE + PYRITE 2)CALCITE 3)BROWN
CLAY 4)CHALCEDONY 5)QUARTZ AND 6)SECOND
GENERATION OF CALCITE*
Leg : 61 Top/Bottom Interval(mm): 970/1010 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 572.00 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 572.99 Sect/Pc #: 1/PCE 1H
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,DIABASIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE
IDENTITY AND/OR PERCENTAGE QUESTIONABLE;
PLAGIOCLASE ( <1%)
Size(mm): 0.3-0.6 Morphology: SUBHEDRAL
STRONGLY ZONED*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.2-0.7
APPROX COMP AN75,NOT STRONGLY ZONED;
CLINOPYROXENE ( 56%)
Size(mm): 0.1-0.6 Morphology: SUBHEDRAL
AUGITE,LIGHT BROWN;
MAGNETITE ( 7%)
Size(mm): 0.002-0.3
TI-MAGN*
Alteration - CARBONATE ( 2%)
PATCHY WHOLESALE REPLACEMENT OF ROCK;
CLAY MINERALS ( 10%)
GREEN,PATCHY WHOLESALE REPLACEMENT OF ROCK;
COMBINATION
Location: VEIN
VEIN CONTAINS PYRITE + CA + CHALCEDONY + CLAY +
QUARTZ*
Leg : 61 Top/Bottom Interval(mm): 1160/1190 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 572.00 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 573.17 Sect/Pc #: 1/PCE 1H
ROCK = APHYRIC BASALT
VEIN IN HIGHLY ALTERED BASALT,BASALT IS SIMILAR
TO PREVIOUS CORES,PERVASIVELY ALTERED TO GREEN
CLAY + BROWN CLAY + MINOR CHLORITE;
Texture: APHYRIC;
Where sampled: VEIN FROM SILL INTERIOR*
Alteration - CALCITE
CHLORITE
CHALCEDONY
PYRITE
CLAY MINERALS
BRIGHT YELLOW-GREEN + GREEN + BROWN CLAY,DOMINANT
ALTERATION (PERVASIVE)*
Leg : 61 Top/Bottom Interval(mm): 1370/1400 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 572.00 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 573.39 Sect/Pc #: 1/PCE 1I
ROCK = BASALT VEIN;
Where sampled: VEIN IN ALTERED BASALT*
Alteration - QUARTZ
Location: VEIN
CALCITE
Location: VEIN
FIRST + SECOND GENERATIONS;
PYRITE
Location: VEIN
CLAY
Location: VEIN
GREEN + BROWN;
CHALCEDONY
Location: VEIN
ZEOLITE
Location: VEIN
PRESENCE QUESTIONABLE;
FERROUS OXIDE
Location: VEIN
FERROUS HYDROX MINS
Location: VEIN
MANGANESE OXIDE
Location: VEIN
MANGANESE HYDROXIDE
Location: VEIN
Leg : 61 Top/Bottom Interval(mm): 980/1000 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 574.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 574.99 Sect/Pc #: 1/PCE 1E
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: INTERIOR OF SILL*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 0.4-0.5 Morphology: ACICULAR-PRISMATIC
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 47%)
Size(mm): <0.2 Morphology: SUBHEDRAL
APPROX COMP AN70-58,MICROLITIC TO GROUNDMASS;
CLINOPYROXENE ( 46%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITIC TO GROUNDMASS;
MAGNETITE ( 5%)
Size(mm): <0.05 Morphology: PRISMATIC
OBSERVED MORE FREQUENTLY IN ALTERED PART*
Alteration - CLAY MINERALS ( 25%)
Location: SPOTS, Replacing: CPX
Location: MESOSTASIS
Leg : 61 Top/Bottom Interval(mm): 360/ 380 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 574.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 575.87 Sect/Pc #: 2/PCE 2B
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: INTERIOR OF SILL*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.5-1.0 Morphology: PRISMATIC
APPROX COMP AN55-60,MICROPHENOS TO PHENOS;
CLINOPYROXENE ( 1%)
Size(mm): 0.5
ASSOCIATES WITH PLAG LATHS,MICROPHENOS TO PHENOS*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): <0.2 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC TO GROUNDMASS,OFTEN IN SPHERULITIC
AGGREGATES WITH CPX;
CLINOPYROXENE ( 46%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITIC TO GROUNDMASS,OFTEN IN SPHERULITIC
AGGREGATES WITH PLAG;
MAGNETITE ( 5%)
Size(mm): <0.05 Morphology: PRISMATIC
MICROLITIC TO GROUNDMASS,MAGN IS OBSERVED MORE
FREQUENTLY IN ALTERED PART*
Alteration - CLAY MINERALS ( 30%)
Location: SPOTS, Replacing: CPX
Location: MESOSTASIS
Leg : 61 Top/Bottom Interval(mm): 1280/1300 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 576.00 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 577.29 Sect/Pc #: 1/PCE 5C
ROCK = PLAG-CPX PHYRIC DOLERITE;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: INTERIOR OF SILL*
Phenocrysts- PLAGIOCLASE ( 7%)
Size(mm): 0.4-0.7 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN60,MICROPHENOS TO PHENOS;
CLINOPYROXENE ( 7%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL-EUHEDRAL
MICROPHENOS TO PHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.4 Morphology: PARTLY SPHERULITIC
MICROLITIC TO GROUNDMASS;
CLINOPYROXENE ( 40%)
Size(mm): <0.4 Morphology: PRISMATIC
MICROLITIC TO GROUNDMASS;
MAGNETITE ( 6%)
Size(mm): <0.05 Morphology: PARTLY DUST-LIKE
MAGN IS OBSERVED MORE FREQUENTLY IN ALTERED AREA,
MICROLITIC TO GROUNDMASS*
Alteration - CLAY MINERALS ( 25%)
Location: SPOTS Replacing: CPX PHENOS,PLAG
CPX PHENOS AND PLAG IN THE MESOSTASIS ARE ALTERED*
Leg : 61 Top/Bottom Interval(mm): 480/ 500 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 576.00 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 577.99 Sect/Pc #: 2/PCE 2B
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: INTERIOR OF SILL*
Phenocrysts- PLAGIOCLASE ( 7%)
Size(mm): 0.4-0.9 Morphology: LATHS
APPROX COMP AN55,SOME LARGE PLATES OF CPX
ENCLOSING LATHS OF PLAG (OPHITIC TEXTURE),
MICROPHENOS TO PHENOS;
CLINOPYROXENE ( 8%)
Size(mm): 0.4-1 Morphology: PLATES
SOME LARGE PLATES OF CPX ENCLOSING LATHS OF PLAG
(OPHITIC TEXTURE),MICROPHENOS TO PHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC;
CLINOPYROXENE ( 39%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC;
MAGNETITE ( 6%)
Size(mm): <0.1 Morphology: PARTLY DUST-LIKE
MICROLITIC;
QUARTZ ( TR%)
ALKALI FELDSPAR ( TR%)
Alteration - CLAY MINERALS ( 30%)
Location: SPOTS Replacing: CPX,PLAG,CPX PHENOS
PHENOS OF CPX AND MICROLITES OF PLAG + CPX ARE
ALTERED*
Leg : 61 Top/Bottom Interval(mm): 100/ 120 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 578.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 578.11 Sect/Pc #: 1/PCE 1
ROCK = MICRODOLORITE;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE
Size(mm): 0.2-0.4 Morphology: EUHEDRAL
PCT. UNCERTAIN,SMEC PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( 1%)
Morphology: ELONGATE PRISMS,TABULAR
MICROPHENOS,DIMENSIONS ARE 0.08-0.1 X 0.3-1.6 MM,
APPROX COMP AN42-90,MARGINS ARE MORE ACIDIC;
CLINOPYROXENE ( TR%)
Groundmass - PLAGIOCLASE ( 55%)
DIMENSIONS ARE 0.02-0.12 X 0.2-0.6 MM,APPROX COMP
AN60-80,MICROLITIC;
CLINOPYROXENE ( 36%)
Size(mm): 0.08-0.6 Morphology: EQUIDIMENSIONAL
MAGNETITE ( 8%)
Size(mm): 0.06-0.2 Morphology: INTERGRANULAR
GLASS ( 15%)
PERCENTAGE QUESTIONABLE,ALTERED TO DARKLY BROWN
CLAY*
Alteration - CLAY MINERALS ( 15%)
Replacing: OL,PYX,GLASS
ISOLATED PSEUDOMORPHS,OL REPLACED BY SMECTITE
PSEUDOMORPHS,GLASS ALTERED TO DARK BROWN CLAY*
Leg : 61 Top/Bottom Interval(mm): 490/ 510 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 578.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 578.50 Sect/Pc #: 1/PCE 2
ROCK = MICRODOLERITE;
Texture: MICRODOLORITIC-INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.8X1.5 Morphology: TABULAR
APPROX COMP AN62-45,ZONED,DIMENSIONS ARE 0.8 X
1.5 MM;
CLINOPYROXENE ( TR%)
Size(mm): 0.6X0.8
DIMENSIONS ARE 0.6 X 0.8 MM*
Groundmass - PLAGIOCLASE ( 31%)
Morphology: PRISMS,MICROLITIC
MICROLITIC;
CLINOPYROXENE ( 45%)
Morphology: ANHEDRAL
MAGNETITE ( 8%)
Morphology: INTERGRANULAR
GLASS ( 15%)
INTERSTITIAL,ALTERED TO DARK-BROWN CLAY*
Alteration - SPHENE ( TR%)
Location: VEINS
IN LEUCOXENE AGGREGATES NEAR AND WITHIN VEINS,
HYDROTHERMAL VEIN FILLING;
CARBONATE ( <1%)
SMALL RELICTS IN CLAY,HYDROTHERMAL VEIN FILLING;
CLAY MINERALS ( 9%)
Location: VEIN INTERIOR Replacing: GLASS
HYDROTHERMAL VEIN FILLING,GLASS ALTERED TO DARK
BROWN CLAY;
ZEOLITE ( 3%)
Location: VEINS
INTERIOR OF VEINS AND LATER VEINS,HYDROTHERMAL
VEIN FILLING;
MUSCOVITE ( 2%)
Location: VEIN MARGINS Replacing: CLAY.MIN,PYX
MUSCOVITE OR PARAGONITE,REPLACING CLAY + FIBROUS
RADIAL AGGREGATES OF PYX,HYDROTHERMAL VEIN
FILLING*
Leg : 61 Top/Bottom Interval(mm): 580/ 600 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 578.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 580.09 Sect/Pc #: 2/PCE 2
ROCK = APHYRIC BASALT
ALTERED,ALL.MINS AND GLASS ARE A PALE GRAYISH
GREEN COLOR;
Texture: APHYRIC,MICRODOLORITIC-INTERSERTAL;
Where sampled: SILL BOTTOM*
Phenocrysts- PLAGIOCLASE ( TR%)
MICROPHENOS*
Groundmass - PLAGIOCLASE
HEAVILY ALTERED;
CLINOPYROXENE
HEAVILY ALTERED;
MAGNETITE ( 12%)
GLASS
PERCENTAGE UNCERTAIN,ALTERED*
Alteration - CLAY MINERALS ( 60%)
Replacing: ALL.MINS,GLASS
PALE GRAYISH-GREEN COLOR*
Vesicles -
Percent: 0
Leg : 61 Top/Bottom Interval(mm): 910/ 930 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 578.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 580.42 Sect/Pc #: 2/PCE 2
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
ALTERED;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC-VARIOLITIC;
Where sampled: SILL TOP*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( TR%)
CLINOPYROXENE ( 2%)
Size(mm): 0.2-1.0 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): <0.02 Morphology: LATHS,NEEDLES
CLINOPYROXENE ( 2%)
Size(mm): <0.02 Morphology: EQUIDIMENSIONAL
MAGNETITE ( 8%)
Size(mm): <0.02 Morphology: DUST-LIKE
GLASS ( 73%)
MESOSTASIS DEEPLY ALTERED*
Alteration - CLAY MINERALS ( 80%)
Replacing: ALL.MINS,GLASS
Leg : 61 Top/Bottom Interval(mm): 1130/1160 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 578.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 580.65 Sect/Pc #: 2/PCE 2
ROCK = CPX-PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL;
Where sampled: NEXT TO GLASSY MARGIN OF SILL*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.1X1.2 Morphology: ELONGATE PRISMS
DIMENSIONS ARE 0.1 X 1.2 MM;
CLINOPYROXENE ( 2%)
Size(mm): 0.2-1.0 Morphology: EQUIDIMENSIONAL
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.04 Morphology: LATHS
CLINOPYROXENE ( 2%)
Size(mm): 0.04 Morphology: IRREGULAR
MAGNETITE ( 8%)
Size(mm): <0.02 Morphology: DUST-LIKE
GLASS ( 68%)
OPAQUE MESOSTASIS*
Alteration - CLAY MINERALS ( 70%)
Location: MESOSTASIS Replacing: GLASS
Leg : 61 Top/Bottom Interval(mm): 720/ 740 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 581.73 Sect/Pc #: 1/PCE 2E
ROCK = CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC,INTERSERTAL-VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN OF SILL*
Phenocrysts- CLINOPYROXENE ( 2%)
Size(mm): 0.5-1.2 Morphology: EQUIDIMENSIONAL
Groundmass - PLAGIOCLASE
Size(mm): <0.04
CLINOPYROXENE
Size(mm): <0.02
SPOTS OF VARIOLITIC AGGREGATES ARE COMMON;
MAGNETITE ( 7%)
Morphology: DUST-LIKE,INTERGRANULAR
SPOTS IN THE MESOSTASIS;
GLASS ( 30%)
SPOTS AND INTERSTITIAL*
Alteration - CLAY MINERALS ( 30%)
Location: MESOSTASIS, Replacing: ALL.MINS,GLASS
Location: GLASS SPOTS
Vesicles -
Size(mm): 0.08
Percent: 2
Location: GROUNDMASS
Filling: ZEOLITES
Shape: ELONGATE,
Shape: IRREGULAR
VUGS,FILLING QUESTIONABLE,SURROUNDED BY
VARIOLITIC AGGREGATES*
Leg : 61 Top/Bottom Interval(mm): 1440/1460 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 582.45 Sect/Pc #: 1/PCE 4C
ROCK = CPX-PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE
PERCENTAGE UNKNOWN,PSEUDOMORPHS AFTER GREEN CLAY;
PLAGIOCLASE ( 1%)
Size(mm): 0.2-0.4
APPROX COMP AN60;
CLINOPYROXENE ( 2%)
Size(mm): 0.3-0.6 Morphology: EUHEDRAL
AUGITE,TWINNED AND WITH INCLUSIONS*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): <0.2 Morphology: SKELETAL
MICROLITE AND CRYSTALLITES,APPROX COMP AN55
USUALLY;
CLINOPYROXENE ( 47%)
Size(mm): <0.08
AUGITE,QUENCH TEXTURES,2VZ= 50;
MAGNETITE ( 10%)
Size(mm): <0.02 Morphology: ANHEDRAL-EUHEDRAL
TI-MAGN*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX,GROUNDMASS
GREEN + BROWN*
Leg : 61 Top/Bottom Interval(mm): 930/ 950 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 583.44 Sect/Pc #: 2/PCE 3F
ROCK = CPX MODERATELY MICROPHYRIC BASALT
ALTERED;
Texture: MODERATELY MICROPHYRIC,INTERGRANULAR-DIABASIC
(SUBOPHITIC);
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <<1%)
Size(mm): 0.5
CLINOPYROXENE ( 3%)
Size(mm): 0.3-0.5
AUGITE,MICROPHENOS*
Groundmass - OLIVINE
PRESENCE QUESTIONABLE;
PLAGIOCLASE ( 25%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP AN60-AN50;
CLINOPYROXENE ( 44%)
Size(mm): 0.05-0.2 Morphology: SUBHEDRAL-EUHEDRAL
AUGITE,LIGHT BROWN COLOR;
MAGNETITE ( 10%)
Size(mm): 0.005-0.2
TITANOMAGNETITE;
GLASS ( 3%)
REPLACED BY CLAY,INTERSTITIAL TRIANGULAR PATCHES*
Alteration - CLAY MINERALS ( 10%)
Replacing: CPX,GLASS
MIXED WITH SECONDARY MAGN DUST,GREEN;
ZEOLITE ( 5%)
Replacing: CPX
MIXED WITH SECONDARY MAGN DUST*
Leg : 61 Top/Bottom Interval(mm): 160/ 200 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 586.18 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE
BADLY ALTERED;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.9-1.0
ONLY ONE PHENO IN SECTION;
CLINOPYROXENE ( 2%)
Size(mm): 0.4-0.8
AUGITE WITH OPHITIC PLAG*
Groundmass - PLAGIOCLASE ( 21%)
Size(mm): 0.2-0.4 Morphology: SUBOPHITIC
APPROX COMP AN68;
CLINOPYROXENE ( 45%)
Size(mm): 0.1-0.6 Morphology: SUBHEDRAL
AUGITE,LIGHT BROWN;
MAGNETITE ( 5%)
Size(mm): <0.1 Morphology: SUBHEDRAL-EUHEDRAL
TI-MAGN;
GLASS ( 2%)
SMALL INTERSTITIAL PATCHES OF ALTERED GLASS,
VARIOLITIC PATCHES WITH FRESH GLASS*
Alteration - CLAY MINERALS ( 25%)
LARGE PATCHES (2 MM),WHOLESALE REPLACEMENT OF
ROCK*
Leg : 61 Top/Bottom Interval(mm): 400/ 420 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 586.41 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE
BADLY ALTERED;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Phenocrysts- CLINOPYROXENE ( 1%)
Size(mm): 0.4-1.0 Morphology: SUBHEDRAL
AUGITE*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN75-AN45;
CLINOPYROXENE ( 36%)
Size(mm): 0.1-0.3
AUGITE,LIGHT BROWN COLOR;
MAGNETITE ( 5%)
Size(mm): <0.05
TI-MAGN;
GLASS ( 8%)
INTERSTITIAL ALTERED GLASS PATCHES*
Alteration - COMBINATION ( 30%)
Location: VEINS,PATCHES
LARGE PATCHES OF CLAY WITH MINOR (LATE) CHLORITE
(ALSO IN VEINS);
CLAY MINERALS
Location: PATCHES,VEINS
CHLORITE
Location: PATCHES,VEINS
Leg : 61 Top/Bottom Interval(mm): 930/ 960 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 586.95 Sect/Pc #: 1/PCE 1E
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
ALTERED,GLASSY;
Texture: MODERATELY MICROPHYRIC,VARIOLITIC;
Where sampled: BOTTOM CHILL MARGIN OF SILL*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): <0.15 Morphology: EUHEDRAL
MICROPHENOS,APPROX COMP AN78-65 (ZONED);
CLINOPYROXENE ( 3%)
Size(mm): 0.05-0.2 Morphology: EUHEDRAL
MICROPHENOS,AUGITE*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): <0.03
SMALL MICROLITES AND CRYSTALLITES;
CLINOPYROXENE ( 5%)
Size(mm): <0.005
AUGITE?,QUENCH TEXTURED FORM;
MAGNETITE ( 10%)
Size(mm): <0.02
TI-MAGN;
GLASS ( 75%)
GLASSY GROUNDMASS MOSTLY REPLACED BY CLAY AND
CHLORITE*
Alteration - CLAY MINERALS
Location: GROUNDMASS Replacing: GROUNDMASS,GLASS,CPX
PERCENTAGE VARIABLE;
CHLORITE
Location: GROUNDMASS Replacing: GROUNDMASS,GLASS,CPX
PCT. VARIABLE*
Leg : 61 Top/Bottom Interval(mm): 1230/1250 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 587.24 Sect/Pc #: 1/PCE 1I
ROCK = CPX-PLAG MODERATELY PHYRIC BASALT
ALTERED;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.5
APPROX COMP AN55-65 (OSCILLATORY ZONING);
CLINOPYROXENE ( 2%)
Size(mm): 0.5-1.0
AUGITE,SUBOPHITIC TEXTURE*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-0.3
APPROX COMP AN60;
CLINOPYROXENE ( 37%)
Size(mm): <0.2 Morphology: SUBHEDRAL-ANHEDRAL
AUGITE,LIGHT BROWN;
MAGNETITE ( 5%)
Size(mm): <0.05 Morphology: SUBHEDRAL
TI-MAGN;
GLASS ( 15%)
ALTERED INTERSTITIAL GLASS PATCHES (ALTERED TO
GREENISH BROWN CLAY)*
Alteration - CLAY MINERALS ( 10%)
Replacing: CPX,GLASS
GREEN-GREENISH BROWN*
Leg : 61 Top/Bottom Interval(mm): 1460/1490 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 587.48 Sect/Pc #: 1/PCE 1K
ROCK = CPX MODERATELY MICROPHYRIC BASALT
ALTERED,FINE GRAINED;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC-INTERSERTAL;
Where sampled: NEAR CHILL MARGIN OF SILL*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.1 Morphology: SUBHEDRAL
ONLY ONE XTL IN SECTION,MICROPHENOS
CLINOPYROXENE ( 3%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL-SUBHEDRAL
AUGITE,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 39%)
Size(mm): <0.03 Morphology: SKELETAL
MICROLITES;
CLINOPYROXENE ( 38%)
Size(mm): <0.01
QUENCH XTLS AND SMALL MICROLITES;
MAGNETITE ( 10%)
Size(mm): <0.01
TI-MAGN;
GLASS
ALL GLASS APPEARS TO BE PLUCKED FROM SECTION (IF
NOT FOR THIS GLASS WOULD PROBABLY COMPRISE 15% OF
THE ROCK)*
Alteration - COMBINATION ( 10%)
Location: VEINS, Replacing: GROUNDMASS
Location: GROUNDMASS
CLAYS + CHLORITE;
CLAY MINERALS
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 80/ 90 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 587.59 Sect/Pc #: 2/PCE 1B
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
ALTERED,GLASSY;
Texture: MODERATELY MICROPHYRIC,VARIOLITIC-HYALOPILITIC;
Where sampled: GLASSY MARGIN OF SILL*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
MICROPHENOS,APPROX COMP AN61,ONLY SLIGHTLY ZONED;
CLINOPYROXENE ( 5%)
Size(mm): 0.05-0.5 Morphology: EUHEDRAL
MICROPHENOS,AUGITE*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): <0.03
MICROLITES AND CRYSTALLITES;
CLINOPYROXENE ( 10%)
Size(mm): <0.02
QUENCH XTLS AND MICROLITES;
MAGNETITE ( 5%)
Size(mm): <0.01 Morphology: EUHEDRAL
TI-MAGN;
GLASS ( 69%)
ALMOST COMPLETELY REPLACED BY CLAY + CHLORITE*
Alteration - COMBINATION
Replacing: GLASS,PLAG PHENOS,
Replacing: CPX PHENOS
CLAYS + CHLORITE ARE REPLACING ALL GLASS AND SOME
QUENCH PLAG + CPX PHENOS;
CLAY MINERALS
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 100/ 110 Describer: Riech, V.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: SEDIMENTARY
Core: 21 Sample Midpoint(m) : 587.60 Sect/Pc #: 2/PCE 1D
ROCK = SEDIMENT
QUARTZIFIED RADIOLARIAN CLAYSTONE,THERE IS A HIGH
AMOUNT OF REDDISH BROWN TRANSPARENT PIGMENT
(ORIGIN AND NATURE?--IN CONTACT WITH GLASSY MARGIN
OF A SILL--BAKED),QUARTZ OCCURS IN THE MATRIX +
VEINS + RADIOLARIAN MOLDS (RADS ARE TOTALLY
DISSOLVED BEFORE CHERTIFICATION),ACCESSORY
COMPONENTS ARE FISH REMAINS AND A GREENISH CLAY
MIN (CHLORITE?) WHICH SOMETIMES FORMS GREENISH
INCLUSIONS AND IS CONCENTRATED AROUND FISH
REMAINS;
Where sampled: SEDIMENT BETWEEN TWO BASALT SILLS
BETWEEN UNITS 3 + 4*
Alteration - QUARTZ
Location: MATRIX,VEINS,
Location: RAD MOLDS
RADS ARE TOTALLY DISSOLVED BEFORE CHERTIFICATION;
CLAY MINERALS
GREENISH (CHLORITE?),SOMETIMES FORMS GREENISH
INCLUSIONS AND IS CONCENTRATED AROUND FISH
REMAINS*
Leg : 61 Top/Bottom Interval(mm): 260/ 290 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 586.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 587.78 Sect/Pc #: 2/PCE 2
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
GLASSY,ALTERED;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC;
Where sampled: NEAR CHILLED MARGIN OF LOWEST SILL IN CORE*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.15-0.25 Morphology: EUHEDRAL
APPROX COMP AN55-60;
CLINOPYROXENE ( 4%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL-SUBHEDRAL
AUGITE,IN GLOMEROPHYRIC CLUSTERS WITH PLAG*
Groundmass - PLAGIOCLASE ( 10%)
<0.02 LONG,MICROLITES AND CRYSTALLITES;
CLINOPYROXENE ( 50%)
Size(mm): <0.003
QUENCH XTLS MOSTLY WITH SOME CRYSTALLITES;
MAGNETITE ( 12%)
Size(mm): <0.008
TI-MAGN;
GLASS ( 21%)
MOSTLY ALTERED TO CHLORITE + GREEN CLAY*
Alteration - COMBINATION ( 30%)
Location: GROUNDMASS Replacing: GROUNDMASS,GLASS,PLAG
CLAYS (GREEN) + CHLORITE,REPLACING QUENCH XTLS
AND GLASS;
CLAY MINERALS (S %)
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 100/ 120 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 588.11 Sect/Pc #: 1/PCE 2
ROCK = CPX-PLAG MODERATELY PHYRIC BASALT
ALTERED;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL;
Where sampled: MARGINAL PORTION OF SILL*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.4-0.6
APPROX COMP AN63;
CLINOPYROXENE ( 5%)
Size(mm): 0.2-0.4
AUGITE*
Groundmass - PLAGIOCLASE ( 27%)
Size(mm): 0.1-0.2
APPROX COMP AN60 ZONED TO AN29;
CLINOPYROXENE ( 20%)
Size(mm): <0.2
AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.04
GLASS ( 15%)
INTERSTITIAL PATCHES TOTALLY REPLACED;
AMPHIBOLE
Alteration - COMBINATION ( 35%)
GREEN CLAY + CHLORITE + SECONDARY AMPHIBOLE;
CLAY MINERALS (S %)
AMPHIBOLE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 350/ 370 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 588.36 Sect/Pc #: 1/PCE 4B
ROCK = CPX-PLAG MODERATELY PHYRIC BASALT
ALTERED;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL;
Where sampled: NEXT TO GLASSY MARGIN OF SILL TOP
TOP OF SILL*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( <1%)
Morphology: TABULAR
APPROX COMP AN58;
CLINOPYROXENE ( 2%)
AVERAGE SIZE = 0.8 MM*
Groundmass - PLAGIOCLASE
Morphology: LATHS
FINE GRAINED MESOSTASIS;
CLINOPYROXENE
Morphology: EQUIDIMENSIONAL,
Morphology: RADIALLY FIBROUS
FINE GRAINED MESOSTASIS;
MAGNETITE ( 12%)
Morphology: DUST-LIKE
GLASS ( 30%)
MESOSTASIS AND PSEUDOMORPHS*
Alteration - CARBONATE ( TR%)
CLAY MINERALS ( 30%)
Location: MESOSTASIS Replacing: GLASS,PYX
PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 1100/1120 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 589.11 Sect/Pc #: 1/PCE 4H
ROCK = CPX MODERATELY PHYRIC BASALT
ALTERED,MORE COARSE GRAINED THAN PREVIOUS THIN
SECTION;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL-
MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Morphology: LATHS
CLINOPYROXENE ( 3%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE = 1.2 MM,INCLUDE PLAG LATHS WITHIN*
Groundmass - PLAGIOCLASE ( 47%)
AVERAGE DIMENSIONS = 0.02 X 0.6 MM,APPROX COMP
AN60,MICROLITES;
CLINOPYROXENE ( 20%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE = 0.06 MM;
MAGNETITE ( 10%)
AVERAGE SIZE = 0.05,INTERSTITIAL;
GLASS ( 20%)
INTERSTITIAL,ALTERED TO DARK CLAY*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
DARK IN COLOR*
Leg : 61 Top/Bottom Interval(mm): 1380/1410 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 589.40 Sect/Pc #: 1/PCE 4I
ROCK = APHYRIC BASALT
HEAVILY ALTERED,MORE FINE GRAINED THAN PREVIOUS
THIN SECTION;
Texture: APHYRIC,INTERSERTAL;
Where sampled: CHILLED MARGIN OF SILL
BOTTOM OF SILL*
Phenocrysts- CLINOPYROXENE ( TR%)
Groundmass - PLAGIOCLASE
PERCENT UNKNOWN,ALTERED;
CLINOPYROXENE
PERCENT UNKNOWN,ALTERED;
MAGNETITE ( 7%)
GLASS
ALTERED*
Alteration - CLAY MINERALS ( 85%)
Location: ENTIRE ROCK Replacing: ALL.MINS,GLASS
Leg : 61 Top/Bottom Interval(mm): 1120/1140 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 590.63 Sect/Pc #: 2/PCE 1
ROCK = APHYRIC BASALT
ALTERED,CONTACT OF HYALOPILITIC AND INTERSERTAL
BASALTS;
Texture: APHYRIC,HYALOPILITIC,INTERSERTAL;
Where sampled: GLASSY MARGIN OF SILL*
Phenocrysts- COMBINATION ( TR%)
Size(mm): 1.6
INCLUDES PLAG+CPX GLOMEROPORPHYRITIC INTERGROWTHS*
Groundmass - PLAGIOCLASE
HEAVILY ALTERED TO DARK GRAY CHLORITE + CLAY;
CLINOPYROXENE
HEAVILY ALTERED TO DARK GRAY CHLORITE + CLAY;
MAGNETITE
HEAVILY ALTERED TO DARK GRAY CHLORITE + CLAY;
GLASS
HEAVILY ALTERED TO DARK GRAY CHLORITE + CLAY*
Alteration - COMBINATION
Location: GROUNDMASS Replacing: GROUNDMASS,ALL.MINS
DARK GRAY CHLORITE + CLAY;
CLAY MINERALS
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 1350/1370 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 590.86 Sect/Pc #: 2/PCE 2A
ROCK = APHYRIC BASALT
SLIGHTLY ALTERED,MORE COARSE GRAINED THAN
PREVIOUS THIN SECTION;
Texture: APHYRIC,INTERSERTAL-MICRDOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
CLINOPYROXENE ( TR%)
Groundmass - PLAGIOCLASE ( 55%)
Morphology: ELONGATE PRISMS
AVERAGE DIMENSIONS = 0.04 X 0.5 MM,APPROX COMP
AN54-78,ZONATED,MICROLITES;
CLINOPYROXENE ( 20%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE = 0.3 MM;
MAGNETITE ( 8%)
Morphology: INTERGRANULAR,DUST-LIKE
AVERAGE SIZE = 0.04 MM;
GLASS ( 17%)
INTERSTITIAL*
Alteration - CLAY MINERALS ( 17%)
Location: INTERGRANULAR Replacing: GLASS
CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
DARK GRAY*
DARK BROWN*
Leg : 61 Top/Bottom Interval(mm): 610/ 680 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 591.65 Sect/Pc #: 3/PCE 1F
ROCK = APHYRIC BASALT
SLIGHTLY MORE COARSE GRAINED THAN PREVIOUS THIN
SECTION BUT ALSO MORE RICH IN GLASS;
Texture: APHYRIC,INTERSERTAL-MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
CLINOPYROXENE ( TR%)
Groundmass - PLAGIOCLASE ( 32%)
Morphology: ELONGATE PRISMS,MICROLITIC
AVERAGE DIMENSIONS = 0.08 X 0.5,ZONED,APPROX
COMP AN40-77,MICROLITES;
CLINOPYROXENE ( 40%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE;
MAGNETITE ( 8%)
Morphology: INTERGRANULAR
GLASS ( 20%)
INTERSTITIAL,ALTERED TO CLAY*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
DARK BROWN*
Leg : 61 Top/Bottom Interval(mm): 810/ 840 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 593.33 Sect/Pc #: 4/PCE 1C
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION,
ENRICHED IN PYROXENE;
Texture: MICRODOLERITIC-INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
CLINOPYROXENE ( TR%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 28%)
Morphology: ELONGATE PRISMS
AVERAGE DIMENSIONS = 0.08 X 0.9 MM,APPROX COMP
AN52-71,MICROLITES;
CLINOPYROXENE ( 49%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE = 0.4 MM;
MAGNETITE ( 8%)
AVERAGE SIZE = 0.12 MM,INTERSTITIAL;
GLASS ( 15%)
INTERSTITIAL,ALTERED TO DARK BROWN CLAY*
Alteration - CLAY MINERALS ( 15%)
Location: INTERSTITIAL Replacing: GLASS
DARK BROWN*
Leg : 61 Top/Bottom Interval(mm): 810/ 850 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 588.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 594.83 Sect/Pc #: 5/PCE 1E
ROCK = MICRODOLERITE
MORE CRYSTALLINE AND COARSE GRAINED THAN PREVIOUS
THIN SECTION;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 2
Groundmass - PLAGIOCLASE ( 32%)
Morphology: ELONGATE PRISMS
AVERAGE DIMENSIONS = 0.06 X 0.4 MM,ZONED,APPROX
COMP AN52-67,MICROLITES;
CLINOPYROXENE ( 60%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE 0.1;
MAGNETITE ( 8%)
Morphology: IRREGULAR
AVERAGE SIZE 0.1,INTERSTITIAL;
GLASS ( 0%)
Alteration - CLAY MINERALS ( 12%)
Replacing: PYX
DARK BROWN PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 190/ 210 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 597.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 597.20 Sect/Pc #: 1/PCE 1A
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC;
Where sampled: CONTACT BETWEEN SEDIMENT AND BASALT SILL*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.5
APPROX COMP AN60-65,MICROPHENOS;
CLINOPYROXENE ( 5%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL-EUHEDRAL
REPLACED BY CALCITE (PSEUDOMORPHS),MICROPHENOS*
Groundmass - PLAGIOCLASE ( 5-6%)
Size(mm): <0.1
ALTERED TO CLAY + CHLORITE;
CLINOPYROXENE ( 5-6%)
Size(mm): <0.1
ALTERED TO CLAY + CHLORITE;
MAGNETITE ( 8%)
Size(mm): 0.01 Morphology: ANGULAR
MOST OF IT IS SECONDARY;
GLASS ( 75%)
ALTERED TO CHLORITE*
Alteration - CARBONATE ( 15%)
Location: VEIN,CLOT Replacing: CPX PHENOS
CPX PHENOS REPLACED BY CALCITE;
COMBINATION ( 45%)
Location: MESOSTASIS Replacing: GLASS,PLAG,CPX
INCLUDES CLAY.MINS+CHLORITE;
QUARTZ ( <1%)
Replacing: GLASS
MAGNETITE ( <8%)
8% TOTAL MAGN OF WHICH MOST IS SECONDARY*
Leg : 61 Top/Bottom Interval(mm): 690/ 710 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 597.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 599.20 Sect/Pc #: 2/PCE 1C
ROCK = CPX-PLAG SPARSELY PHYRIC BASALT
MASSIVE;
Texture: SPARSELY PORPHYRITIC,INTERSERTAL-HYALOPILITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 0.1%)
Size(mm): 1.8 Morphology: SUBHEDRAL
APPROX COMP AN65;
CLINOPYROXENE ( 1-2%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL-EUHEDRAL
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.4 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC;
CLINOPYROXENE ( 38%)
Size(mm): <0.1 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 5%)
Size(mm): <0.05 Morphology: ANGULAR
GLASS ( 15%)
MESOSTASIS*
Alteration - CLAY MINERALS ( 40%)
Replacing: PLAG,CPX,GLASS
REPLACING MICROLITES OF PLAG + CPX*
Leg : 61 Top/Bottom Interval(mm): 950/ 980 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 597.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 599.47 Sect/Pc #: 2/PCE 2A
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
BASALT SILL;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL
APPROX COMP AN65,MICROPHENOS;
CLINOPYROXENE ( 3%)
Size(mm): 0.3-0.4 Morphology: EUHEDRAL-SUBHEDRAL
FORMS A SUBOPHITIC TEXTURE IN SOME AREAS,
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.2 Morphology: SUBHEDRAL
PARTLY MICROLITIC;
CLINOPYROXENE ( 35%)
Size(mm): <0.1 Morphology: SUBHEDRAL
PARTLY MICROLITIC;
MAGNETITE ( 6%)
Size(mm): <0.05 Morphology: ANGULAR
GLASS ( 15%)
MOSTLY ALTERED TO CLAY MINS*
Alteration - CLAY MINERALS (35-40%)
Location: GROUNDMASS Replacing: CPX,GLASS
Leg : 61 Top/Bottom Interval(mm): 750/ 770 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 597.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 600.76 Sect/Pc #: 3/PCE 5
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 4-5%)
Size(mm): 0.4-0.5 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN65,MICROPHENOS;
CLINOPYROXENE ( 3-4%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL-EUHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITIC;
CLINOPYROXENE
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE
Size(mm): <0.1 Morphology: ANGULAR
APATITE
Morphology: ACICULAR
IN CPX AND PLAG*
Alteration - COMBINATION ( 35%)
Replacing: CPX,PLAG,CPX PHENOS
SMEC + CHLORITE,PHENOS AND MICROLITES OF CPX ARE
OFTEN ALTERED,PLAG PARTLY ALTERED,
CHLORITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 80/ 100 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 606.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 606.09 Sect/Pc #: 1/PCE 2A
ROCK = DOLERITE;
Texture: INTERGRANULAR-SUBOPHITIC;
Where sampled: SILL INTERIOR*
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5-6%)
Size(mm): 0.4-0.9 Morphology: SUBHEDRAL
PLAGIOCLASE ( 5-6%)
Size(mm): 0.4-0.9 Morphology: SUBHEDRAL
APPROX COMP AN60,PHENOS AND MICROPHENOS;
CLINOPYROXENE ( 3-4%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL-EUHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.3 Morphology: EUHEDRAL-SUBHEDRAL
MICROLITIC;
CLINOPYROXENE ( 45%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 3-5%)
Size(mm): <0.1 Morphology: ANGULAR
QUARTZ ( TR%)
ALKALI FELDSPAR ( TR%)
Alteration - CLAY MINERALS ( 35%)
Replacing: CPX MICROPHENOS,PLAG,CPX
REPLACING MICROPHENOS OF CPX,MICROLITES OF
PLAG + CPX ARE OFTEN ALTERED*
Leg : 61 Top/Bottom Interval(mm): 270/ 310 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 606.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 606.29 Sect/Pc #: 1/PCE 2C
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 6-8%)
Size(mm): 0.4-1.5 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN65 (AN80-25?),PHENOS AND
MICROPHENOS;
CLINOPYROXENE ( 6-8%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL-EUHEDRAL
OFTEN FORMS AGGREGATES (GLOMEROPORPHYRITIC)*
Groundmass - PLAGIOCLASE ( 38%)
Size(mm): <0.3 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC TO GROUNDMASS;
CLINOPYROXENE ( 37%)
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITIC TO GROUNDMASS;
MAGNETITE ( 10%)
Size(mm): <0.1 Morphology: ANGULAR
GLASS
FRESH;
QUARTZ ( TR%)
ALKALI FELDSPAR ( TR%)
Alteration - CLAY MINERALS (20-30%)
Replacing: CPX,PLAG
ALTERED MICROLITES OF CPX + PLAG*
Leg : 61 Top/Bottom Interval(mm): 510/ 540 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 606.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 611.03 Sect/Pc #: 4/PCE 4
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.6-1.2 Morphology: SUBHEDRAL-EUHEDRAL
PHENOS + MICROPHENOS,APPROX COMP AN60-65;
CLINOPYROXENE ( 5-6%)
Size(mm): 0.4 Morphology: SUBHEDRAL-EUHEDRAL
FORMS AGGREGATES IN SOME CASES,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.3 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC TO GROUNDMASS;
CLINOPYROXENE ( 40%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITIC TO GROUNDMASS;
MAGNETITE ( 10%)
Size(mm): <0.1 Morphology: ANGULAR
Alteration - CLAY MINERALS ( 20%)
Replacing: CPX,PLAG
ALTERED MICROLITES OF PLAG + CPX*
Leg : 61 Top/Bottom Interval(mm): 390/ 420 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 615.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 615.41 Sect/Pc #: 1/PCE 5
ROCK = DOLERITE
VERY ALTERED;
Texture: SUBOPHITIC (DIABASIC);
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.6 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,TWINNED,APPROX COMP AN60;
CLINOPYROXENE ( <1%)
Size(mm): 0.3-0.5 Morphology: SUBHEDRAL
MICROPHENOS,AUGITE;
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN60;
CLINOPYROXENE ( 15%)
Size(mm): 0.1-0.2
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.2 Morphology: SKELETAL,SUBHEDRAL
TI-MAGN;
GLASS (10-15%)
ALTERED INTERSTITIAL PATCHES OF GLASS;
QUARTZ ( TR%)
IN INTERSTITIAL GLASS PATCHES;
AMPHIBOLE ( 15%)
RIMMING CPX*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX,PLAG
GREEN;
CHLORITE ( 15%)
Replacing: CPX,PLAG
Leg : 61 Top/Bottom Interval(mm): 390/ 420 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 615.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 615.41 Sect/Pc #: 1/PCE 5
ROCK = DOLERITE;
Texture: INTERSERTAL-INTERGRANULAR;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.4-0.7 Morphology: SUBHEDRAL
MICROPHENOS,APPROX COMP AN60;
CLINOPYROXENE ( 3%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
MICROPHENOS,OFTEN FORMS AGGREGATES*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <0.2 Morphology: SUBHEDRAL-EUHEDRAL
MICROLITIC;
CLINOPYROXENE ( 35%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 3-5%)
Size(mm): <0.08 Morphology: ANGULAR
GLASS ( 5%)
ALTERED TO A CLAY MIN*
Alteration - COMBINATION ( 40%)
Replacing: PLAG,CPX,GLASS
CLAY + CHLORITE REPLACE MICROLITES OF PLAG + CPX
AND GLASS;
CLAY MINERALS
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 990/1020 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 615.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 616.01 Sect/Pc #: 1/PCE 9
ROCK = DOLERITE
ALTERED;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
CLINOPYROXENE ( <1%)
Size(mm): 0.4-0.5
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL
APPROX COMP AN62;
CLINOPYROXENE ( 35%)
Size(mm): 0.05-0.15
AUGITE;
MAGNETITE ( 10%)
PERCENTAGE IS DIFFICULT TO DETERMINE BECAUSE THE
THIN SECTION IS TOO THICK;
GLASS ( 10%)
ALTERED INTERSTITIAL PATCHES*
Alteration - COMBINATION ( 25%)
DARK ALTERATION PRODUCTS ARE NOT DIFFERENTIABLE
DUE TO THE THICKNESS OF THIS SECTION*
Leg : 61 Top/Bottom Interval(mm): 990/1020 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 615.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 616.01 Sect/Pc #: 1/PCE 9
ROCK = DOLERITE;
Texture: INTERSERTAL-INTERGRANULAR;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.5-0.6 Morphology: SUBHEDRAL
PARTLY SUBOPHITIC,APPROX COMP AN70;
CLINOPYROXENE ( 3%)
Size(mm): 0.5-0.6 Morphology: SUBHEDRAL
PARTLY SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): <0.4 Morphology: SUBHEDRAL-EUHEDRAL
PARTLY MICROLITIC;
CLINOPYROXENE ( 48%)
Size(mm): <0.3 Morphology: SUBHEDRAL
PARTLY MICROLITIC;
MAGNETITE ( 2%)
Size(mm): <0.05 Morphology: ANGULAR
Alteration - CLAY MINERALS ( 25%)
Location: SPOTS Replacing: CPX
Leg : 61 Top/Bottom Interval(mm): 310/ 330 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 626.32 Sect/Pc #: 1/PCE 2
ROCK = DOLERITE
ALTERED WITH GRANOPHYRIC PATCHES;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Phenocrysts- CLINOPYROXENE ( TR%)
Size(mm): TO 0.5
AUGITE*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.1-0.3
APPROX COMP AN58 ZONED TO AN2(;
CLINOPYROXENE ( 15%)
Size(mm): <0.2
AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.2 Morphology: SUBHEDRAL
TI-MAGN;
COMBINATION ( 2-3%)
INCLUDES ALKALI FELDSPAR + QUARTZ GRANOPHYRIC
INTERGROWTHS;
AMPHIBOLE ( 15%)
NEEDLES + PATCHES,ACTINOLITE? + HBL;
QUARTZ
Morphology: CRYSTALLINE,SUBHEDRAL
Alteration - CLAY MINERALS ( 20%)
GREEN;
CHLORITE ( 15%)
Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 970/1000 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 626.99 Sect/Pc #: 1/PCE 8
ROCK = DOLERITE
ALTERED,COARSE GRAINED WITH GRANOPHYRES;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Phenocrysts- CLINOPYROXENE ( <1%)
Size(mm): 0.6-0.7 Morphology: SUBHEDRAL
AUGITE*
Groundmass - PLAGIOCLASE ( 23%)
Size(mm): 0.2-0.5
APPROX COMP AN87 CORES WITH RIMS OF AN35;
CLINOPYROXENE ( 35%)
Size(mm): 0.4-0.5
AUGITE;
MAGNETITE ( 7%)
Size(mm): <0.2 Morphology: EUHEDRAL-SUBHEDRAL
TI-MAGN;
COMBINATION ( 2-3%)
INCLUDES QUARTZ + ALKALI FELDSPAR GRANOPHYRES;
AMPHIBOLE
ACTINOLITE? (NON-PLEOCHROIC) + HBL (GAMMA= DARK
BROWN--ALPHA= CLEAR--BETA= LIGHT BROWN--GAMMA TO
Z= 0 DEGREES)*
Alteration - COMBINATION ( 35%)
Location: PATCHES
INCLUDES AMPH + CHLORITE + BROWN CLAY IN PATCHES
AND DISTRIBUTED THROUGH ROCK,AMPH RIMMED WITH
CHLORITE*
Leg : 61 Top/Bottom Interval(mm): 770/ 800 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 628.28 Sect/Pc #: 2/PCE 6
ROCK = DOLERITE
ALTERED,GRANOPHYRIC;
Texture: DIABASIC,COARSE GRAINED;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.2-0.9
APPROX COMP AN70 ZONED TO AN40;
CLINOPYROXENE ( 33%)
Size(mm): 0.2-0.8
AUGITE;
MAGNETITE ( 12%)
Size(mm): TO 0.2
TI-MAGN;
COMBINATION ( 1-2%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRIC PATCHES;
APATITE ( TR%)
Alteration - COMBINATION ( 30%)
Location: PATCHES
INCLUDES BROWN CLAY + AMPH*
Leg : 61 Top/Bottom Interval(mm): 1250/1280 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 628.77 Sect/Pc #: 2/PCE 9
ROCK = DOLERITE
GRANOPHYRIC;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.6 Morphology: SUBHEDRAL-EUHEDRAL
COMPLEX TWINS,APPROX COMP AN50-AN30;
CLINOPYROXENE ( 37%)
Size(mm): 0.2-0.5
AUGITE,PALE BROWN;
MAGNETITE ( 10%)
Size(mm): <0.3 Morphology: EUHEDRAL-ANHEDRAL
TI-MAGN;
COMBINATION ( 3%)
INCLUDES QUARTZ + ALKALI FELDSPAR GRANOPHYRIC
AGGREGATES*
Alteration - COMBINATION ( 20%)
INCLUDES BROWN CLAY + AMPH*
Leg : 61 Top/Bottom Interval(mm): 1250/1280 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 628.77 Sect/Pc #: 2/PCE 9
ROCK = MICRODOLERITE;
Texture: SPOTTED MICRDOLERITIC-DOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
AVERAGE DIMENSIONS= 0.4X1.0 MM,APPROX COMP
AN52-70 (SOME GRAINS SHOW ZONING AN70-28),
GLOMEROPORPHRYTIC AGGREGATES WITH CPX;
CLINOPYROXENE ( 2%)
AVERAGE SIZE= 0.8,GLOMEROPORPHYRITIC AGGREGATES*
Groundmass - PLAGIOCLASE ( 25%)
AVERAGE LENGTH= 0.1-0.6 MM,AVERAGE COMP AN62,
MICROLITES,GRAIN SIZE LIMITS FOR MICRODOLERITIC
AND DOLERITIC TEXTURES ARE ACCEPTABLE;
CLINOPYROXENE ( 64%)
Size(mm): 0.02-0.3 Morphology: EQUIDIMENSIONAL
MAGNETITE ( 8%)
AVERAGE SIZE= 0.2,INTERGRANULAR;
GLASS
HOLOCRYSTALLINE;
QUARTZ ( TR%)
Size(mm): 0.2-0.4
INTERGRANULAR AND IN GRANOPHYRIC AGGREGATES;
ALKALI FELDSPAR ( TR%)
Size(mm): 0.1
GRANOPHYRIC NUCLEARS;
APATITE ( TR%)
Morphology: ACICULAR
NEEDLES IN QUARTZ*
Alteration - CLAY MINERALS ( 15%)
Location: INTERGRANULAR Replacing: ALL.MINS
DARK BROWN*
Leg : 61 Top/Bottom Interval(mm): 710/ 740 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 629.73 Sect/Pc #: 3/PCE 3
ROCK = MICRODOLERITE
GRAIN SIZE AND TEXTURE THE SAME AS IN PREVIOUS
THIN SECTION;
Texture: MICRODOLERITIC-DOLERITIC;
Where sampled: SILL INTERIOR
Phenocrysts- PLAGIOCLASE ( TR%)
Morphology: ELONGATE PRISMS,TABULAR
AVERAGE LENGTH= 1.0,APPROX COMP AN52-70,SLIGHTLY
CORRODED;
CLINOPYROXENE ( 1%)
Morphology: EQUIDIMENSIONAL
SLIGHTLY CORRODED*
Groundmass - PLAGIOCLASE ( 30%)
AVERAGE LENGTH= 0.1-0.6,AVERAGE COMP AN62,
MICROLITES,GRAIN SIZE LIMITS FOR MICRODOLERITIC
AND DOLERITIC TEXTURES ARE ACCEPTABLE;
CLINOPYROXENE ( 61%)
Size(mm): 0.02-0.3 Morphology: EQUIDIMENSIONAL
MAGNETITE ( 8%)
AVERAGE SIZE= 0.2,INTERGRANULAR;
GLASS
HOLOCRYSTALLINE;
COMBINATION ( TR%)
Size(mm): 0.1-0.4
INCLUDES QUARTZ + ALKALI FELDSPAR INTERGRANULAR
GRANOPHYRIC AGGREGATES;
APATITE ( TR%)
Morphology: ACICULAR
THIN NEEDLES IN QUARTZ*
Alteration - CLAY MINERALS ( 20%)
Location: INTERGRANULAR Replacing: ALL.MINS
PSEUDOMORPHS,PALE GRAYISH GREEN*
Leg : 61 Top/Bottom Interval(mm): 1330/1360 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 626.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 630.35 Sect/Pc #: 3/PCE 6
ROCK = MICRODOLERITE
ALL THE SAME AS IN PREVIOUS THIN SECTION,
SUBPARALLEL PYROXENE AND MAGNETITE GRAIN CHAINS
APPEAR;
Texture: MICRODOLERITIC-DOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Morphology: TABULAR
AVERAGE SIZE= 1.6,COARSE ZONAEDGRAINS;
CLINOPYROXENE ( TR%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 1.6*
Groundmass - PLAGIOCLASE (30-45%)
AVERAGE LENGTH= 0.4 MM,AVERAGE COMP AN62,
MICROLITES;
CLINOPYROXENE (43-58%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.02-0.3 MM;
MAGNETITE ( 12%)
AVERAGE SIZE= 0.2,INTERGRANULAR;
QUARTZ ( TR%)
Size(mm): 0.1-0.3
INTERGRANULAR ISOLATED GRAINS AND GRANOPHYRIC
AGGREGATES;
ALKALI FELDSPAR ( TR%)
Size(mm): 0.1
INTERGRANULAR ISOLATED GRAINS AND GRANOPHYRIC
AGGREGATES;
APATITE ( TR%)
Size(mm): <0.02 Morphology: ACICULAR
NEEDLES IN QUARTZ*
Alteration - CLAY MINERALS ( 20%)
Location: INTERGRANULAR Replacing: PLAG
PSEUDOMORPHS,PRESUMABLY REPLACING PLAG,PALE
GRAYISH GREEN*
Leg : 61 Top/Bottom Interval(mm): 960/ 980 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 630.97 Sect/Pc #: 1/PCE 4
ROCK = DOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION
AND MORE LEUCOCRATIC;
Texture: DOLERITIC-MICRODOLERITIC*
Groundmass - PLAGIOCLASE (35-45%)
AVERAGE LENGTH= 0.2-0.6 MM,APPROX COMP AN43-63,
MICROLITES;
CLINOPYROXENE (43-53%)
Morphology: EQUIDIMENSIONAL
MAGNETITE ( 10%)
AVERAGE SIZE= 0.6,INTERGRANULAR;
GLASS
HOLOCRYSTALLINE ROCK;
COMBINATION ( 2%)
Size(mm): 0.4-0.8
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRIC
INTERGROWTHS;
APATITE ( TR%)
Morphology: ACICULAR
THIN NEEDLES IN QUARTZ*
Alteration - CLAY MINERALS ( 12%)
Replacing: PYX
PSEUDOMORPHS,DARK BROWN*
Leg : 61 Top/Bottom Interval(mm): 280/ 300 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 631.79 Sect/Pc #: 2/PCE 1B
ROCK = MICRODOLERITE
SLIGHTLY MORE FINE GRAINED THAN PREVIOUS THIN
SECTION,INTERSTITIAL VARIOLITIC AGGREGATES;
Texture: SPOTTED MICRODOLERITIC-DOLERITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Morphology: PRISMS
AVERAGE LENGTH= 0.1-0.8,APPROX COMP AN60-80,
MICROLITES;
CLINOPYROXENE ( 33%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.08-0.4 MM;
MAGNETITE ( 7%)
Size(mm): 0.04-0.4
INTERGRANULAR;
GLASS ( 15%)
AVERAGE SIZE= 0.4 MM,INTERSTITIAL VARIOLITIC
AGGREGATES;
QUARTZ ( TR%)
Size(mm): 0.1
INTERSTITIAL*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
BROWN PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 730/ 750 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 632.24 Sect/Pc #: 2/PCE 2B
ROCK = DOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION
AND MORE CRYSTALLIZED,VARIOLITIC,INTERSTITIAL;
Texture: SPOTTED DOLERITIC-VARIOLITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 38%)
Morphology: ELONGATE PRISMS,TABULAR
LENGTH= 0.6-4 MM,APPROX COMP AN52-62;
CLINOPYROXENE ( 18%)
Size(mm): 0.4-5 Morphology: ELONGATE PRISMS
CORRODED,INCLUDING PLAG MICROLITES;
MAGNETITE ( 6%)
Size(mm): 0.1-1.2
INTERGRANULAR;
GLASS ( 38%)
Size(mm): 1-8
INTERSTITIAL VARIOLITIC TO HYALOPILITIC
MESOSTASIS*
Alteration - CLAY MINERALS ( 10%)
Replacing: GLASS
PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 80/ 100 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 633.09 Sect/Pc #: 3/PCE 1
ROCK = MICRODOLERITE
MORE FINE GRAINED THAN PREVIOUS THIN SECTION,
IDENTICAL TO (28-2, 28-30 CM);
Texture: MICRODOLERITIC-VARIOLITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Morphology: PRISMS
AVERAGE LENGTH= 0.1-0.8 MM,APPROX COMP AN60-72,
MICROLITES;
CLINOPYROXENE ( 38%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.08-0.4;
MAGNETITE ( 7%)
Size(mm): 0.4-0.4
INTERGRANULAR;
GLASS ( 15%)
INTERSTITIAL VARIOLITIC AGGREGATES*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
BROWN PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 1340/1360 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 634.35 Sect/Pc #: 3/PCE 3G
ROCK = MICRODOLERITE
SLIGHTLY MORE FINE GRAINED THAN PREVIOUS THIN
SECTION,HOLOCRYSTALLINE;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Morphology: ELONGATE PRISMS
LENGTH= 1.2 MM;
CLINOPYROXENE ( 1%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.5,CORRODED*
Groundmass - PLAGIOCLASE (35-40%)
AVERAGE LENGTH= 0.4 MM,APPROX COMP AN58-65,
MICROLITES;
CLINOPYROXENE (53-58%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.03 MM;
MAGNETITE ( 7%)
AVERAGE SIZE= 0.2 MM,INTERGRANULAR;
GLASS
HOLOCRYSTALLINE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: ALL.MINS
BROWN PSEUDOMORPHS AND GRAYISH GREEN GROUNDMASS*
Leg : 61 Top/Bottom Interval(mm): 680/ 700 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 635.19 Sect/Pc #: 4/PCE 2B
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION;
Texture: SPOTTED MICRODOLERITIC-HYALOPILITIC,
INTERSTITIAL;
Where sampled: SILL INTERSTITIAL*
Phenocrysts- PLAGIOCLASE ( 2%)
Morphology: ELONGATE PRISMS
LENGTH= 0.8-1.2 MM,APPROX COMP AN72;
CLINOPYROXENE ( 1%)
Morphology: EQUIDIMENSIONAL
CORRODED,AVERAGE SIZE= 1.2*
Groundmass - PLAGIOCLASE ( 45%)
LENGTH= 0.04-0.4 MM,APPROX COMP AN48-65,
MICROLITES;
CLINOPYROXENE ( 35%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.1 MM;
MAGNETITE ( 8%)
AVERAGE SIZE= 0.07 MM,INTERGRANULAR;
GLASS ( 12%)
Size(mm): 0.1-1.3
INTERSTITIAL HYALOPILITIC AGGREGATES*
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: GLASS,ALL.MINS
BROWN PSEUDOMORPHS AND PALE GRAYISH GREEN IN
GROUNDMASS*
Leg : 61 Top/Bottom Interval(mm): 260/ 280 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 630.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 636.27 Sect/Pc #: 5/PCE 1
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION;
Texture: MICRODOLERITIC,HOLOCRYSTALLINE;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( RARE%)
RARE RELICTS OF RESORBED COARSE GRAINS;
CLINOPYROXENE ( RARE%)
RARE RELICTS OF RESORBED COARSE GRAINS*
Groundmass - PLAGIOCLASE ( 55%)
LENGTH= 0.4-1.2,APPROX COMP AN52,MICROLITES;
CLINOPYROXENE ( 40%)
Size(mm): 0.2-0.8 Morphology: ELONGATED
INTERGRANULAR,CORRODED;
MAGNETITE ( 5%)
Size(mm): 0.04-0.08 Morphology: DUST-LIKE
Alteration - CLAY MINERALS ( 30%)
Replacing: ALL.MINS
PALE GRAYISH GREEN*
Leg : 61 Top/Bottom Interval(mm): 60/ 90 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 636.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 636.08 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL-EUHEDRAL
CLINOPYROXENE ( 7-10%)
Size(mm): 0.4-0.9 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.4 Morphology: EUHEDRAL-SUBHEDRAL
MICROLITIC,OFTEN FORMS SPHERULITIC AGGREGATES;
CLINOPYROXENE ( 40%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 5-8%)
Size(mm): <0.1 Morphology: ANGULAR
QUARTZ ( TR%)
ALKALI FELDSPAR ( TR%)
APATITE
Alteration - CLAY MINERALS (10-15%)
Location: SPOTS Replacing: CPX,PLAG
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 1020/1050 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 636.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 640.03 Sect/Pc #: 3/PCE 1D
ROCK = DOLERITE;
Texture: SUBOPHITIC-OPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.7-1.0 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN55;
CLINOPYROXENE ( 15%)
Size(mm): 0.6-1.0 Morphology: SUBHEDRAL-EUHEDRAL
MAGNETITE ( 3-5%)
Size(mm): 0.7 Morphology: SKELETAL
PARTLY SKELETAL*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.4 Morphology: EUHEDRAL
APPROX COMP AN60,MICROLITIC;
CLINOPYROXENE ( 30%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 5%)
Size(mm): <0.4 Morphology: SKELETAL
MICROLITIC;
QUARTZ ( 1-2%)
FORMS MICROPEGMATITE WITH ALK.SPAR;
ALKALI FELDSPAR
FORMS MICROPEGMATITE WITH QUARTZ;
KAERSUTITE ( TR%)
APATITE
Morphology: ACICULAR
Alteration - CLAY MINERALS ( 0-5%)
Location: SPOTS Replacing: CPX
CHLORITE ( 1%)
Replacing: CPX
Leg : 61 Top/Bottom Interval(mm): 370/ 400 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 636.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 642.39 Sect/Pc #: 5/PCE 1C
ROCK = DOLERITE;
Texture: INTERGRANULAR-SUBOPHITIC;
Where sampled: SILL INTERIOR
MASSIVE DOLERITE SILL*
Phenocrysts- PLAGIOCLASE ( 1-3%)
Size(mm): 0.7-0.8 Morphology: SUBHEDRAL
APPROX COMP AN50;
CLINOPYROXENE (10-12%)
Size(mm): 0.7-1.2 Morphology: EUHEDRAL-SUBHEDRAL
THE PHENOS OF THIS THIN SECTION ARE CHARACTERIZED
BY PREVAILING LARGE CPX (ABOUT 1 MM) AND MAGN;
MAGNETITE ( 2-4%)
Size(mm): 0.6-1.0 Morphology: SKELETAL
THE PHENOS OF THIS THIN SECTION ARE CHARACTERIZED
BY PREVAILING LARGE CPX (ABOUT 1 MM) AND MAGN*
Groundmass - PLAGIOCLASE ( 36%)
Size(mm): <0.3 Morphology: SUBHEDRAL-EUHEDRAL
CLINOPYROXENE ( 36%)
Size(mm): <0.3 Morphology: SUBHEDRAL
MAGNETITE ( 4-6%)
Size(mm): <0.2 Morphology: SKELETAL
COMBINATION ( 1-2%)
INCLUDES QUARTZ + ALK.SPAR FORMING MICROPEGMATITE;
KAERSUTITE ( 1%)
APATITE ( TR%)
Alteration - CLAY MINERALS ( 10%)
Location: SPOTS Replacing: PLAG,CPX
CHLORITE ( 5%)
Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 970/1000 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 636.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 644.49 Sect/Pc #: 6/PCE 1
ROCK = DOLERITE;
Texture: INTERGRANULAR-SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 2-3%)
Size(mm): 0.5-0.9 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN60-63;
CLINOPYROXENE ( 5-7%)
Size(mm): 0.5-0.9 Morphology: SUBHEDRAL
MAGNETITE ( 1-2%)
Size(mm): 0.7 Morphology: SKELETAL
Groundmass - PLAGIOCLASE ( 41%)
Size(mm): <0.3 Morphology: EUHEDRAL-SUBHEDRAL
MICROLITIC;
CLINOPYROXENE ( 40%)
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 5%)
Morphology: SKELETAL
COMBINATION ( 2%)
INCLUDES QUARTZ + ALK.SPAR FORMING MICROPEGMATITE;
KAERSUTITE ( TR%)
APATITE ( TR%)
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX
CHLORITE ( 5%)
Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 480/ 500 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 645.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 645.49 Sect/Pc #: 1/PCE 2
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 0.4-1.8 Morphology: SUBHEDRAL-EUHEDRAL
CLINOPYROXENE ( 8-9%)
Size(mm): 0.4-1.3 Morphology: SUBHEDRAL
MAGNETITE ( 4%)
Size(mm): 0.4 Morphology: SKELETAL
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.4 Morphology: EUHEDRAL-SUBHEDRAL
MICROLITIC;
CLINOPYROXENE ( 40%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MICROLITIC;
MAGNETITE ( 3%)
Size(mm): <0.2 Morphology: SKELETAL
MICROLITIC;
COMBINATION ( 0-1%)
INCLUDES QUARTZ + ALK.SPAR FORMING MICROPEGMATITE;
KAERSUTITE ( 0-1%)
Alteration - CLAY MINERALS ( 5-6%)
Location: SPOTS Replacing: CPX
CHLORITE ( 5-6%)
Location: SPOTS Replacing: PLAG,HBL
Leg : 61 Top/Bottom Interval(mm): 210/ 230 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 645.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 649.72 Sect/Pc #: 4/PCE 1
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5-8%)
Size(mm): 0.4-0.7 Morphology: SUBHEDRAL
ZONED,APPROX COMP AN40-60;
CLINOPYROXENE ( 4%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL-EUHEDRAL
MAGNETITE ( 1-2%)
Size(mm): 0.5-0.8 Morphology: SKELETAL
Groundmass - PLAGIOCLASE ( 42%)
Size(mm): <0.4 Morphology: SUBHEDRAL-EUHEDRAL
CLINOPYROXENE ( 40%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MAGNETITE ( 3-4%)
Size(mm): <0.2 Morphology: SKELETAL-ACICULAR
COMBINATION ( 0-1%)
INCLUDES QUARTZ + ALK.SPAR FORMING MICROPEGMATITE;
KAERSUTITE ( 0-1%)
Size(mm): <0.2
HORNBLENDE
GREEN*
Alteration - CLAY MINERALS ( 5-10%)
Location: SPOTS Replacing: CPX
CHLORITE ( 5%)
Location: SPOTS Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 480/ 500 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 654.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 654.49 Sect/Pc #: 1/PCE 2A
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 8-10%)
Size(mm): 0.4-0.7 Morphology: SUBHEDRAL
APPROX COMP AN60-50;
CLINOPYROXENE ( 3-5%)
Size(mm): 0.4-0.7 Morphology: EUHEDRAL-SUBHEDRAL
MAGNETITE ( 1-2%)
Size(mm): 0.4 Morphology: SKELETAL
TI-MAGN*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.3 Morphology: SUBHEDRAL-EUHEDRAL
CLINOPYROXENE ( 35%)
Size(mm): <0.4 Morphology: SUBHEDRAL
CLINOPYROXENE ( 35%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MAGNETITE ( 4-5%)
Size(mm): <0.2 Morphology: SKELETAL
COMBINATION ( 2%)
INCLUDES QUARTZ + ALK.SPAR FORMING MICROPEGMATITE;
KAERSUTITE ( 0-1%)
Size(mm): 0.1
Alteration - CLAY MINERALS ( 3-5%)
Location: SPOTS Replacing: CPX
CHLORITE ( 3-5%)
Location: SPOTS Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 440/ 480 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 655.50 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 655.96 Sect/Pc #: 1/PCE 3
ROCK = DOLERITE;
Texture: HYALOPILITIC-INTERSERTAL;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 1-2%)
Size(mm): 0.4-0.8 Morphology: PRISMATIC
APPROX COMP AN60-65;
CLINOPYROXENE ( 2-3%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL
OFTEN FORMS AGGREGATES*
Groundmass - PLAGIOCLASE ( 42%)
Size(mm): <0.2 Morphology: SUBHEDRAL
CLINOPYROXENE ( 42%)
Size(mm): <0.05 Morphology: SUBHEDRAL
MAGNETITE ( 2-3%)
Size(mm): <0.01 Morphology: DUST-LIKE
GLASS ( 5-10%)
ALTERED TO CLAY*
Alteration - CLAY MINERALS (10-20%)
Location: INTERSTITIAL Replacing: GLASS,CPX
CHLORITE
Location: VEIN,SPOTS
Leg : 61 Top/Bottom Interval(mm): 980/ 0 Describer: Moberly, R.
Hole: 462A Top of Core Depth(m) : 655.50 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 657.98 Sect/Pc #: 2/
ROCK = HYALOCLASTITE
CEMENTED BY ZEOLITES,GRAINS= 60%,PERCENT TEXTURE=
30% SAND + 70% SILT*
Groundmass - PLAGIOCLASE ( 1%)
GLASS ( 40%)
ONLY SLIGHTLY ALTERED,ANGULAR AND BLOCKY-POLYGONAL
TO SUBROUNDED,SIZE RANGE IS 10-120 MICRONS BUT
MOST GRAINS ARE 50-70 MICRONS (COARSE SILT OR FINE
SAND),POORLY PACKED,WELL SORTED;
OTHER ( 19%)
VOLCANIC GRAINS OF LITHIC AND ALTERED LITHIC
BASALT*
Alteration - CLAY MINERALS
IN ALTERED GLASS;
ZEOLITE ( 40%)
PROBABLY CLINOPTILOLITE,CEMENT CONSISTS OF A
MOSAIC OF LATHS (5X2 MICRONS) OF ZEOLITES*
Leg : 61 Top/Bottom Interval(mm): 100/ 120 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 685.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 685.11 Sect/Pc #: CC/PCE 2
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC-SPHERULITIC;
Where sampled: SILL MARGINAL ZONE*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.4 Morphology: EUHEDRAL
ZONED,MICROPHENOS,APPROX COMP AN80,IN
GLOMEROPHYRIC CLUSTERS WITH CPX;
CLINOPYROXENE ( 3%)
Size(mm): 0.1-0.3 Morphology: SUBHEDRAL
AUGITE,IN GLOMEROPHYRIC CLUSTERS WITH PLAG,
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 28%)
Size(mm): <0.2 Morphology: SKELETAL,QUENCH,ANHEDRAL
CLINOPYROXENE ( 37%)
Size(mm): <0.2
AUGITE;
MAGNETITE
Size(mm): <0.04 Morphology: SKELETAL,QUENCH,GRANULAR
TI-MAGN;
GLASS (10-15%)
Alteration - CLAY MINERALS ( 20%)
Replacing: CPX,GLASS
BROWNISH GREEN*
Leg : 61 Top/Bottom Interval(mm): 210/ 230 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 685.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 685.22 Sect/Pc #: CC/PCE 3
ROCK = PLAG SPARSELY MICROPHYRIC BASALT
MORE FINE GRAINED THAN PREVIOUS THIN SECTION,HAS
VEIN-LIKE INTERSERTAL SEGREGATION;
Texture: SPARSELY MICROPHYRIC,VARIOLITIC;
Where sampled: GLASSY SILL MARGIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.2
IN GLOMEROPHYRIC AGGREGATES WITH CPX,MICROPHENOS;
CLINOPYROXENE ( TR%)
AVERAGE SIZE= 0.4 MM,IN GLOMEROPHYRIC AGGREGATES
WITH PLAG*
Groundmass - PLAGIOCLASE ( 2%)
Size(mm): <0.04 Morphology: LATHS
IN VARIOLITIC MESOSTASIS;
CLINOPYROXENE ( >1%)
Size(mm): 0.08 Morphology: EQUIDIMENSIONAL
MAGNETITE
Size(mm): <0.01 Morphology: DUST-LIKE
PERCENTAGE IS UNKNOWN;
GLASS ( >95%)
VARIOLITIC MESOSTASIS*
Alteration - CLAY MINERALS ( 1%)
Replacing: CPX,PLAG
PSEUDOMORPHS AFTER CPX + PLAG IN
GLOMEROPORPHYRITIC AGGREGATES,DARK BROWNISH GREEN;
CLAY MINERALS ( >90%)
Location: MESOSTASIS Replacing: GLASS
BROWN*
Leg : 61 Top/Bottom Interval(mm): 340/ 360 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 685.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 685.35 Sect/Pc #: CC/PCE 4
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.3-0.5 Morphology: EUHEDRAL
CORRODED,MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): 0.4
AUGITE,SUBOPHITIC,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-0.3 Morphology: LATHS
APPROX COMP AN65;
CLINOPYROXENE
Size(mm): 0.1-0.2 Morphology: GRANULAR
AUGITE;
MAGNETITE
Size(mm): <0.04
TI-MAGN*
Alteration - AMPHIBOLE
Replacing: CPX
CLAY MINERALS ( 15%)
Replacing: ALL.MINS
BROWN*
Leg : 61 Top/Bottom Interval(mm): 530/ 550 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 691.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 691.54 Sect/Pc #: 1/PCE 6
ROCK = DOLERITE
FRESH;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 42%)
Size(mm): 0.3-0.5 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AN70;
CLINOPYROXENE ( 43%)
Size(mm): 0.3-0.5
2VZ 50,AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.5
TI-MAGN;
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRES (AT LEAST
QUARTZ IS PRESENT);
APATITE ( TR%)
Alteration - CLAY MINERALS ( 5%)
Replacing: CPX
BROWN*
Leg : 61 Top/Bottom Interval(mm): 180/ 200 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 691.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 692.69 Sect/Pc #: 2/PCE 1
ROCK = DOLERITE
RELATIVELY FRESH,FINE;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 41%)
Size(mm): 0.1-0.2
APPROX COMP AN60;
CLINOPYROXENE ( 41%)
Size(mm): 0.1-0.2
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.04
TI-MAGN;
GLASS ( 3%)
ALTERED INTERSTITIAL PATCHES;
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRIC PATCHES*
Alteration - CLAY MINERALS ( 10%)
Replacing: CPX,GLASS
BROWN*
Leg : 61 Top/Bottom Interval(mm): 420/ 460 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 691.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 692.94 Sect/Pc #: 2/PCE 1
ROCK = PLAG-CPX MODERATELY MICROPHYRIC BASALT
FAIRLY FRESH;
Texture: MODERATELY MICROPHYRIC,VARIOLITIC,HYALOPILITIC,
INTERGRANULAR;
Where sampled: GLASSY SILL MARGIN*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
GLOMEROPHYRIC CLUSTERS WITH CPX,MICROPHENOS;
CLINOPYROXENE ( 2%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL
GLOMEROPHYRIC CLUSTERS WITH PLAG,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.04
IN INTERGRANULAR PATCHES;
CLINOPYROXENE ( 61%)
Size(mm): <0.04
IN INTERGRANULAR PATCHES;
MAGNETITE ( 5%)
Size(mm): <0.04
TI-MAGN*
Alteration - CLAY MINERALS ( 5-20%)
Location: SPOTS Replacing: GLASS,CPX
Leg : 61 Top/Bottom Interval(mm): 490/ 510 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 691.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 693.00 Sect/Pc #: 2/PCE 2
ROCK = PLAG-CPX MODERATELY MICROPHYRIC BASALT
FRESH;
Texture: MODERATELY MICROPHYRIC,GLASSY-VARIOLITIC;
Where sampled: GLASSY SILL MARGIN*
Phenocrysts- PLAGIOCLASE ( 4%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL
MICROPHENOS,APPROX COMP AN70,IN GLOMEROPHYRIC
AGGREGATES WITH CPX;
CLINOPYROXENE ( 2%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
MICROPHENOS,AUGITE,IN GLOMEROPHYRIC AGGREGATES
WITH PLAG*
Groundmass - CLINOPYROXENE
Morphology: SKELETAL
QUENCH;
PLAGIOCLASE
PROBABLE MICROLITES,SWALLOW-TAIL TEXTURED;
GLASS ( 94%)
APPEARS EITHER DEVITRIFIED OR ALTERED,IT IS BROWN
AND SLIGHTLY ISOTROPIC*
Alteration - COMBINATION
Location: GROUNDMASS Replacing: GROUNDMASS,PHENOS
INCLUDES CLAY + CHLORITE,DIFFICULT TO ESTIMATE
PERCENTAGE BUT BOTH ARE PRESENT REPLACING BOTH
GROUNDMASS AND PHENOS*
Leg : 61 Top/Bottom Interval(mm): 640/ 670 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 691.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 693.16 Sect/Pc #: 2/PCE 2
ROCK = CPX-PLAG SPARSELY MICROPHYRIC BASALT
MASSIVE;
Texture: SPARSELY MICROPHYRIC,INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,APPROX COMP AN72;
CLINOPYROXENE ( 1%)
Size(mm): 0.1 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,AUGITE*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): <0.04 Morphology: SUBHEDRAL
MICROLITES,APPROX COMP AN70-72;
CLINOPYROXENE ( 44%)
Size(mm): <0.04 Morphology: SUBHEDRAL-GRANULAR
AUGITE,QUENCH TEXTURED;
MAGNETITE ( 5%)
Size(mm): <0.02
GLASS ( 5-10%)
DIFFICULT TO IDENTIFY DUE TO REPLACEMENT BY CLAY,
VARIOLITIC/SPHERULITIC PATCHES ARE PRESENT*
Alteration - CLAY MINERALS ( 25%)
Replacing: ALL.MINS,GLASS
BROWN*
Leg : 61 Top/Bottom Interval(mm): 1260/1280 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 691.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 693.77 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT
ALTERED,FINE GRAINED (BUT MORE COARSE GRAINED THAN
PREVIOUS THIN SECTION);
Texture: APHYRIC,INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL
MICROPHENOS,APPROX COMP AN70,IN GLOMEROPHYRIC
CLOTS WITH CPX;
CLINOPYROXENE ( <1%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
MICROPHENOS,AUGITE,IN GLOMEROPHYRIC CLOTS WITH
PLAG*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): <0.04 Morphology: SUBHEDRAL,LATH-LIKE
MICROLITES,APPROX COMP AN70;
CLINOPYROXENE ( 49%)
Size(mm): <0.04 Morphology: SUBHEDRAL-GRANULAR
AUGITE,QUENCH TEXTURED,HIGH CPX/PLAG RATIO MAY
ONLY BE APPARENT BECAUSE OF THE LARGE QUANTITY OF
QUENCH MATERIAL;
MAGNETITE
Size(mm): <0.02
TI-MAGN*
Alteration - CLAY MINERALS ( 25%)
Replacing: GLASS,ALL.MINS
BROWN*
Leg : 61 Top/Bottom Interval(mm): 510/ 540 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 692.53 Sect/Pc #: 1/PCE 4
ROCK = CPX SPARSELY MICROPHYRIC BASALT;
Texture: SPARSELY MICROPHYRIC,VARIOLITIC;
Where sampled: SILL TOP*
Phenocrysts- PLAGIOCLASE ( TR%)
Morphology: ELONGATE PRISMS
AVERAGE LENGTH= 0.4 MM,APPROX COMP AN68,RARELY
TABULAR,MICROPHENOS;
CLINOPYROXENE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.3 MM,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 2%)
Size(mm): <0.002 Morphology: LATHS
CLINOPYROXENE ( TR%)
Size(mm): <0.002
MAGNETITE ( 7%)
Size(mm): 0.002 Morphology: DUST-LIKE
GLASS ( 91%)
ALTERED TO PALAGONITE (REDDISH BROWN)*
Alteration - CLAY MINERALS ( 91%)
Location: GROUNDMASS Replacing: GLASS
PALAGONITE,REDDISH BROWN*
Leg : 61 Top/Bottom Interval(mm): 970/ 990 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 694.48 Sect/Pc #: 2/PCE 5A
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Morphology: EUHEDRAL,RHOMBIC
CLAY PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( TR%)
Morphology: TABULAR
ZONED,APPROX COMP AN52-68,MICROPHENOS;
CLINOPYROXENE ( TR%)
Morphology: EQUIDIMENSION
AVERAGE SIZE= 0.4 MM,MICROPHENOS*
Groundmass - OLIVINE ( 5%)
AVERAGE SIZE= 0.2 MM,CLAY PSEUDOMORPHS;
PLAGIOCLASE
Morphology: ELONGATE PRISMS
AVERAGE LENGTH= 0.4 MM,APPROX COMP AN80;
CLINOPYROXENE
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.08 MM;
MAGNETITE ( 7%)
Morphology: DUST-LIKE
INTERGRANULAR;
GLASS ( 0%)
HOLOCRYSTALLINE ROCK;
SPINEL
Size(mm): 0.02 Morphology: EUHEDRAL
CR-SPINEL,INCLUSIONS IN CLAY PSEUDOMORPHS*
Alteration - CLAY MINERALS ( 5%)
Replacing: OL
PSEUDOMORPHS AFTER OL,REDDISH BROWN PALAGONITE*
Leg : 61 Top/Bottom Interval(mm): 760/ 780 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 695.77 Sect/Pc #: 3/PCE 3A
ROCK = MICRODOLERITE
MORE FINE GRAINED THAN PREVIOUS THIN SECTION,
VARIOLITIC SPOTS PRESENT;
Texture: MICRODOLERITIC;
Where sampled: NEAR SILL BOTTOM*
Groundmass - OLIVINE
Size(mm): 0.08-0.2 Morphology: EUHEDRAL
CLAY PSEUDOMORPHS;
PLAGIOCLASE
AVERAGE LENGTH= 0.2 MM,APPROX COMP AN72-85;
CLINOPYROXENE
AVERAGE SIZE= 0.08 MM,INTERSTITIAL,SOMETIMES AS
RADIADED AGGREGATES;
MAGNETITE ( 5%)
Size(mm): 0.04-0.1 Morphology: DUST-LIKE,LATHS
RARELY LATHS;
GLASS ( 10%)
Size(mm): 0.3-0.4
INTERSTITIAL VARIOLITIC AGGREGATES*
Alteration - CLAY MINERALS ( 1%)
Replacing: OL
GRAYISH BROWN EUHEDRAL PSEUDOMORPHS*
CLAY MINERALS ( 10%)
REDDISH BROWN,PALAGONITE,VARIOLITIC AGGREGATES*
Leg : 61 Top/Bottom Interval(mm): 1420/1440 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 696.43 Sect/Pc #: 3/PCE 3F
ROCK = APHYRIC BASALT
MORE FINE GRAINED THAN PREVIOUS THIN SECTION;
Texture: APHYRIC,VARIOLITIC;
Where sampled: SILL BOTTOM*
Groundmass - OLIVINE ( TR%)
Size(mm): 0.1 Morphology: EUHEDRAL
CLAY PSEUDOMORPHS;
PLAGIOCLASE ( 3%)
Size(mm): <0.04 Morphology: LATHS
CLINOPYROXENE ( 1%)
Size(mm): 0.04 Morphology: EQUIDIMENSIONAL
MAGNETITE ( 5%)
Size(mm): <0.02 Morphology: DUST-LIKE
GLASS ( 91%)
GROUNDMASS*
Alteration - CLAY MINERALS ( 91%)
Location: MESOSTASIS Replacing: GLASS,OL
REDDISH BROWN PALAGONITE,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 670/ 700 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 697.19 Sect/Pc #: 4/PCE 7
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VARIOLITIC;
Where sampled: SILL TOP*
Groundmass - OLIVINE ( TR%)
Size(mm): 0.1 Morphology: EUHEDRAL
CLAY PSEUDOMORPHS;
PLAGIOCLASE ( 3%)
Size(mm): <0.04 Morphology: LATHS
CLINOPYROXENE ( 1%)
Size(mm): 0.04 Morphology: EQUIDIMENSIONAL
MAGNETITE ( 5%)
Size(mm): <0.02 Morphology: DUST-LIKE
GLASS ( 91%)
GROUNDMASS*
Alteration - CLAY MINERALS ( 91%)
Location: MESOSTASIS Replacing: GLASS,OL
REDDISH BROWN PALAGONITE,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 660/ 680 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 698.67 Sect/Pc #: 5/PCE 5
ROCK = CPX SPARSELY MICROPHYRIC BASALT
SLIGHTLY MORE COARSE GRAINED THAN PREVIOUS THIN
SECTION;
Texture: APHYRIC,VARIOLITIC;
Where sampled: SILL INTERIOR NEAR BOTTOM*
Phenocrysts- PLAGIOCLASE ( TR%)
AVERAGE LENGTH= 0.6 MM,MICROLITES;
CLINOPYROXENE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.2 MM,MICROPHENOS*
Groundmass - OLIVINE ( TR%)
AVERAGE SIZE= 0.2 MM,AROUND CLAY PSEUDOMORPHS;
PLAGIOCLASE ( 5%)
Morphology: LATHS
AVERAGE LENGTH= 0.2 MM;
CLINOPYROXENE ( 2%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.05 MM;
MAGNETITE
Size(mm): <0.04 Morphology: DUST-LIKE
GLASS ( 92%)
MESOSTASIS ALTERED TO CLAY*
Alteration - CLAY MINERALS ( 92%)
Location: MESOSTASIS Replacing: GLASS,OL
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 980/1000 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 692.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 698.99 Sect/Pc #: 5/PCE 8
ROCK = CPX-OL SLIGHTLY MICROPHYRIC BASALT
SLIGHTLY MORE FINE GRAINED THAN PREVIOUS THIN
SECTION;
Texture: SLIGHTLY MICROPHYRIC,VARIOLITIC;
Where sampled: SILL BOTTOM*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.2
MICROPHENOS;
PLAGIOCLASE ( TR%)
Size(mm): 0.7 Morphology: TABULAR
RARE MEGACRYSTS,APPROX COMP AN80;
CLINOPYROXENE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.4 MM,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 2%)
Morphology: LATHS
APPROX COMP AN68;
CLINOPYROXENE ( 1%)
Morphology: EQUIDIMENSIONAL
MAGNETITE
Size(mm): <0.02 Morphology: DUST-LIKE
GLASS ( 95%)
MESOSTASIS ALTERED TO CLAY*
Alteration - CLAY MINERALS ( 95%)
Location: MESOSTASIS Replacing: GLASS
Leg : 61 Top/Bottom Interval(mm): 500/ 520 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 702.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 702.51 Sect/Pc #: 1/PCE 4C
ROCK = CPX-OL-PLAG MODERATELY MICROPHYRIC BASALT
MASSIVE;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.4
PSEUDOMORPH,MICROPHENOS;
PLAGIOCLASE ( 1-2%)
Size(mm): 0.4-0.6 Morphology: SUBHEDRAL
APPROX COMP AN65-70,FORMS AGGREGATES WITH CPX;
CLINOPYROXENE ( 2-3%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL
MICROPHENOS,FORMS AGGREGATES WITH PLAG*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.15 Morphology: SUBHEDRAL
CLINOPYROXENE (30-35%)
Size(mm): <0.06 Morphology: SLIGHTLY SPHERULITIC-
Morphology: DENDRITIC
MAGNETITE ( 10%)
Size(mm): <0.01 Morphology: DUST-LIKE
GLASS (25-30%)
ALTERED TO CLAY MINS*
Alteration - CLAY MINERALS ( 30%)
Location: MESOSTASIS Replacing: GLASS,PLAG,CPX
Leg : 61 Top/Bottom Interval(mm): 570/ 600 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 702.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 702.59 Sect/Pc #: 1/PCE 5A
ROCK = CPX-PLAG-OL MODERATELY MICROPHYRIC BASALT
MASSIVE;
Texture: MODERATELY MICROPHYRIC,HYALOPILITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.2
PSEUDOMORPH,MICROPHENOS;
PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL
APPROX COMP AN65,MICROPHENOS,OFTEN FORMS
AGGREGATES WITH CPX;
CLINOPYROXENE ( 1-2%)
Size(mm): 0.2-0.3 Morphology: EUHEDRAL
MICROPHENOS,OFTEN FORMS AGGREGATES WITH PLAG*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): <0.05 Morphology: ANHEDRAL
CLINOPYROXENE ( 15%)
Size(mm): <0.05 Morphology: SUBHEDRAL-ANHEDRAL
MAGNETITE ( 7%)
Size(mm): <0.01 Morphology: DUST-LIKE
GLASS ( 60%)
ALTERED TO CLAY (OR ZEOLITE)*
Alteration - COMBINATION (20-30%)
Location: MESOSTASIS Replacing: GLASS
INCLUDES CLAYS + ZEOLITES*
Leg : 61 Top/Bottom Interval(mm): 230/ 250 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 702.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 703.74 Sect/Pc #: 2/PCE 1A
ROCK = DOLERITE;
Texture: HYALOPILITIC;
Where sampled: GLASSY MARGIN OF SILL*
Phenocrysts- PLAGIOCLASE (10-12%)
Size(mm): 0.4-0.8 Morphology: ACICULAR-SUBHEDRAL
APPROX COMP AN70;
CLINOPYROXENE (10-12%)
Size(mm): 0.2 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): <0.4 Morphology: ACICULAR
CLINOPYROXENE ( 10%)
Size(mm): <0.1 Morphology: SUBHEDRAL-ANHEDRAL
MAGNETITE ( 5-10%)
Size(mm): <0.01 Morphology: DUST-LIKE
GLASS (45-50%)
ALTERED TO CLAY MIN OR ZEOLITE*
Alteration - CARBONATE ( 5%)
Replacing: CPX MICROPHENOS
COMBINATION ( 30%)
Location: MESOSTASIS
INCLUDES CLAYS + ZEOLITES*
Leg : 61 Top/Bottom Interval(mm): 410/ 430 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 702.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 703.92 Sect/Pc #: 2/PCE 1B
ROCK = DOLERITE;
Texture: INTERSERTAL-SUBOPHITIC;
Where sampled: NEXT TO GLASSY MARGIN OF SILL*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): 0.4-0.8 Morphology: PRISMATIC
APPROX COMP AN55,FORMING A SPHERULITIC TEXTURE;
CLINOPYROXENE ( 26%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
0.2 MM IS PREVAILING,MICROPHENOS*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.2
PSEUDOMORPH;
PLAGIOCLASE ( 25%)
Size(mm): <0.3 Morphology: SUBHEDRAL-EUHEDRAL
PARTLY MICROLITIC;
CLINOPYROXENE ( 25%)
Size(mm): <0.1 Morphology: SUBHEDRAL-ANHEDRAL
PARTLY MICROLITIC;
MAGNETITE ( 3-5%)
Size(mm): 0.1-0.2 Morphology: ANGULAR-PRISMATIC
Alteration - COMBINATION (10-15%)
Location: INTERSTITIAL Replacing: CPX,PLAG
INCLUDES CLAYS + ZEOLITES*
Leg : 61 Top/Bottom Interval(mm): 100/ 120 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 711.11 Sect/Pc #: 1/PCE 1
ROCK = DOLERITE;
Texture: INTERGRANULAR-SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 40%)
Size(mm): 0.3-0.8 Morphology: ACICULAR,SUBHEDRAL
APPROX COMP AN65,0.8 MM= ACICULAR TYPE AND 0.3 MM=
SUBHEDRAL TYPE;
CLINOPYROXENE ( 40%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
MAGNETITE ( 5%)
Size(mm): 0.2 Morphology: ANGULAR
TI-MAGN*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): <0.1 Morphology: SUBHEDRAL
PARTLY MICROLITIC;
CLINOPYROXENE ( 5%)
Size(mm): <0.1 Morphology: SUBHEDRAL
PARTLY MICROLITIC;
MAGNETITE ( 2%)
Size(mm): <0.1 Morphology: DUST-LIKE
PARTLY MICROLITIC*
Alteration - CLAY MINERALS ( 5-8%)
Location: PLAG, Replacing: PLAG
Location: INTERSTITIAL
FOUND WITHIN PLAG AND INTERSTITIAL;
CHLORITE ( 3%)
Leg : 61 Top/Bottom Interval(mm): 1300/1330 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 712.32 Sect/Pc #: 1/PCE 5C
ROCK = DOLERITE
FROM A MASSIVE DOLERITE SILL;
Texture: INTERSERTAL TO INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 0.3-0.8 Morphology: ACICULAR,SUBHEDRAL
2 TYPES (EITHER ACICULAR OR SUBHEDRAL,APPROX COMP
AN65,MEGACRYST (2-2.5 MM / APPROX COMP AN75-80);
CLINOPYROXENE ( 10%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITES;
CLINOPYROXENE ( 40%)
Size(mm): <0.2 Morphology: SUBHEDRAL
MICROLITES;
MAGNETITE ( 4-5%)
Size(mm): <0.2 Morphology: ANGULAR
CLOSELY ASSOCIATED WITH ALTERED PARTS,MICROLITES;
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR,INTERGROWN,
MICROPEGMATITE*
Alteration - CLAY MINERALS ( 5-10%)
Location: SPOTS Replacing: PLAG
CHLORITE ( 3%)
Location: INTERSTITIAL
Leg : 61 Top/Bottom Interval(mm): 1100/1120 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 713.61 Sect/Pc #: 2/PCE 1C
ROCK = DOLERITE
MASSIVE DOLERITE SILL;
Texture: SUBOPHITIC-INTERSERTAL;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 0.4 Morphology: ACICULAR,SUBHEDRAL
APPROX COMP AN60-65,2 TYPES (EITHER ACICULAR OR
SUBHEDRAL);
CLINOPYROXENE ( 10%)
Size(mm): 0.4
Groundmass - PLAGIOCLASE
Size(mm): <0.3 Morphology: SUBHEDRAL-ANHEDRAL
MICROLITES;
CLINOPYROXENE
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITES;
MAGNETITE ( 4-5%)
Size(mm): <0.2 Morphology: ANGULAR
CLOSELY ASSOCIATED WITH ALTERED PART;
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR,INTERGROWN,
MICROPEGMATITE;
HORNBLENDE
GREEN,OBSERVED AT MARGIN OF CPX*
Alteration - CLAY MINERALS ( 5-10%)
Location: SPOTS Replacing: PLAG
CHLORITE ( 3-5%)
Leg : 61 Top/Bottom Interval(mm): 800/ 820 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 716.31 Sect/Pc #: 4/PCE 1C
ROCK = DOLERITE
MASSIVE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5-8%)
Size(mm): 0.4-0.8 Morphology: SUBHEDRAL
APPROX COMP AN60;
CLINOPYROXENE ( 5-8%)
Size(mm): 0.4 Morphology: SUBHEDRAL-ANHEDRAL
MAGNETITE ( 1%)
Size(mm): 0.8-1.0 Morphology: SKELETAL
TI-MAGN,COEXISTS WITH GREEN HBL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITES;
CLINOPYROXENE ( 40%)
Size(mm): <0.3 Morphology: SUBHEDRAL
MICROLITES;
MAGNETITE ( 5-6%)
Size(mm): <0.3 Morphology: SKELETAL,DUST-LIKE
SEEMS TO BE CLOSELY ASSOCIATED WITH ALTERED AREA
(SECONDARY MINERAL);
COMBINATION ( TR%)
INCLUDES QUARTZ + ALKALI FELDSPAR,INTERGROWTHS;
HORNBLENDE
GREEN*
Alteration - COMBINATION ( 5-10%)
Location: SPOTS Replacing: PLAG
INCLUDES CLAYS + ZEOLITES;
CHLORITE ( 3-5%)
Location: SPOTS Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 780/ 800 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 717.79 Sect/Pc #: 5/PCE 1E
ROCK = DOLERITE
MASSIVE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE (10-13%)
Size(mm): 0.5-1.0 Morphology: SUBHEDRAL
APPROX COMP AN55-60;
CLINOPYROXENE ( 10%)
Size(mm): 0.4-0.5 Morphology: SUBHEDRAL
MAGNETITE ( 1-2%)
Size(mm): 0.4 Morphology: SKELETAL
TI-MAGN*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MICROLITES;
CLINOPYROXENE ( 35%)
Size(mm): <0.3 Morphology: SUBHEDRAL-ANHEDRAL
MICROLITES;
MAGNETITE ( 5-8%)
Size(mm): <0.2
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR,MICROPEGMATITE;
HORNBLENDE ( TR%)
A TRACE OF BOTH GREEN AND BROWN HBL*
Alteration - CLAY MINERALS (10-15%)
Location: SPOTS Replacing: PLAG
CHLORITE ( 3-5%)
Location: SPOTS Replacing: PLAG
Leg : 61 Top/Bottom Interval(mm): 900/ 920 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 719.41 Sect/Pc #: 6/PCE 1D
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE (15-20%)
Size(mm): 0.5-0.8 Morphology: SUBHEDRAL
APPROX COMP AN65-70;
CLINOPYROXENE ( 8-10%)
Size(mm): 0.5-0.7 Morphology: SUBHEDRAL
MAGNETITE ( 2-4%)
Size(mm): 0.4 Morphology: SKELETAL
TI-MAGN*
Groundmass - OLIVINE ( 1-2%)
Size(mm): 0.2
PLAGIOCLASE ( 30%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MICROLITES;
CLINOPYROXENE ( 30%)
Size(mm): <0.4 Morphology: SUBHEDRAL
MICROLITES;
MAGNETITE ( 5-8%)
Size(mm): <0.2 Morphology: SKELETAL
COMBINATION
QUARTZ + ALK.SPAR, MICROPEGMATITE;
APATITE ( TR%)
HORNBLENDE ( TR%)
BROWN*
Alteration - COMBINATION ( 5-10%)
Location: SPOTS Replacing: PLAG
INCLUDES CLAYS + ZEOLITES;
CHLORITE ( 3-5%)
Location: SPOTS Replacing: PLAG,CPX
Leg : 61 Top/Bottom Interval(mm): 960/ 990 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 711.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 720.98 Sect/Pc #: 7/PCE 1F
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,HYALOPILITIC;
Where sampled: GLASSY MARGIN OF SILL*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): 0.2
PSEUDOMORPH,MICROPHENOS;
PLAGIOCLASE ( 3-5%)
Size(mm): 0.5-1.5 Morphology: ACICULAR
APPROX COMP AN65;
CLINOPYROXENE ( 1%)
Size(mm): 0.5 Morphology: SUBHEDRAL-EUHEDRAL
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.4 Morphology: ACICULAR
PARTLY MICROLITES;
CLINOPYROXENE (10-15%)
Size(mm): <0.3 Morphology: SUBHEDRAL
PARTLY MICROLITES;
MAGNETITE ( 5-6%)
Size(mm): <0.01 Morphology: DUST-LIKE
SECONDARY MINERAL?;
GLASS ( 50%)
ALTERED TO CLAY*
Alteration - COMBINATION (35-40%)
Location: INTERSTITIAL Replacing: GLASS,CPX,PLAG
INCLUDES CLAY.MINS+ZEOLITES*
Leg : 61 Top/Bottom Interval(mm): 370/ 390 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 729.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 729.38 Sect/Pc #: 1/PCE 3
ROCK = PLAG-OL-SPINEL MODERATELY MICROPHYRIC BASALT
ALTERED;
Texture: MODERATELY MICROPHYRIC,GLASSY-VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.1-0.6
MICROPHENOS,PSEUDOMORPHS AFTER ZEOLITE + CLAY +
AMPH;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.5
MICROPHENOS,APPROX COMP AN65;
SPINEL ( <1%)
Size(mm): <0.02
MICROPHENOS,AS INCLUSIONS IN OL PSEUDOMORPHS*
Groundmass - PLAGIOCLASE ( 3%)
Size(mm): <0.05 Morphology: SKELETAL
SMALL XTLS + MICROLITES + CRYSTALLITES;
MAGNETITE ( 3%)
Size(mm): 0.002 Morphology: DUST-LIKE
FINE TI-MAGN;
GLASS ( 90%)
VARIOLITIC AND SPHERULITIC TEXTURE*
Alteration - AMPHIBOLE
Replacing: OL
BROWN PLEOCHROIC AND FIBROUS;
CLAY MINERALS
Replacing: GLASS,OL,PLAG
PERCENTAGE VARIABLE;
ZEOLITE
Location: GROUNDMASS, Replacing: OL,PLAG
Location: VEINS
PERCENTAGE VARIABLE*
Leg : 61 Top/Bottom Interval(mm): 1280/1300 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 729.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 730.29 Sect/Pc #: 1/PCE 8
ROCK = PLAG-OL-CPX-SPINEL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,
HYALOPILITIC-INTERSERTAL;
Where sampled: PILLOW/SILL INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.2-0.5
MICROPHENOS,PSEUDOMORPHS (CLAY ET AL)*
PLAGIOCLASE ( 4%)
Size(mm): 0.1-0.4
MICROPHENOS,APPROX COMP AN58 ZONED TO AN30;
CLINOPYROXENE ( 1%)
Size(mm): <0.05
MICROPHENOS,AUGITE,2VZ 50;
SPINEL ( <1%)
Size(mm): 0.03
MICROPHENOS,PICOTITE?,INCLUSIONS IN OL
PSEUDOMORPHS*
Groundmass - PLAGIOCLASE ( 27%)
QUENCH MICROLITES + CRYSTALLITES + ETC.;
CLINOPYROXENE ( 50%)
QUENCH XTLS IN GROUNDMASS;
MAGNETITE
Size(mm): <.0125
TI-MAGN*
Alteration - QUARTZ ( .1%)
Location: GROUNDMASS Replacing: GROUNDMASS
AMPHIBOLE
Replacing: OL
BROWN PLEOCHROIC AND FIBROUS,PERCENTAGE VARIABLE;
CLAY MINERALS ( 15%)
Location: VEIN Replacing: GLASS,OL,PLAG
ZEOLITE
Location: GROUNDMASS Replacing: OL,PLAG,GROUNDMASS
Leg : 61 Top/Bottom Interval(mm): 270/ 300 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 729.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 730.78 Sect/Pc #: 2/PCE 3
ROCK = OL-PLAG-SPINEL MODERATELY MICROPHYRIC BASALT
ALTERED;
Texture: MODERATELY MICROPHYRIC,GLASSY-VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 0.01 Morphology: SKELETAL
OLIVINE ( 3%)
Size(mm): 0.2-0.4 Morphology: EUHEDRAL
MICROPHENOS,PSEUDOMORPHS;
CRYSTALS AND CRYSTALLITES;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL
MAGNETITE
Size(mm): <0.002 Morphology: DUST-LIKE
IN VARIOLITIC ZONE;
MICROPHENOS,APPROX COMP AN80;
SPINEL ( <1%)
Size(mm): <0.03
GLASS ( 90%)
VARIOLITIC AND NON-VARIOLITIC TEXTURED,MOSTLY
INCLUSIONS IN OL PSEUDOMORPHS*
REPLACED BY SMEC + ZEOLITE ET AL*
Alteration - AMPHIBOLE
Replacing: OL
REPLACING CORES OF OL GRAINS,BROWN PLEOCHROIC AND
FIBROUS,PERCENTAGE VARIABLE;
CLAY MINERALS
Replacing: GLASS,OL
BROWN,PERCENTAGE VARIABLE;
ZEOLITE
Location: VEINS Replacing: GLASS,PLAG
PERCENTAGE VARIABLE*
Leg : 61 Top/Bottom Interval(mm): 530/ 560 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 729.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 731.05 Sect/Pc #: 2/PCE 6
ROCK = CPX-PLAG-OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,INTERSERTAL;
Where sampled: PILLOW/SILL INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <0.2
MICROPHENOS,PSEUDOMORPHS AFTER CLAY;
PLAGIOCLASE ( 2%)
Size(mm): <0.3
MICROPHENOS,APPROX COMP AN73-75,PATCHY
DISTRIBUTION;
CLINOPYROXENE ( 3%)
Size(mm): <0.1
MICROPHENOS,AUGITE,SECTOR ZONED;
SPINEL ( TR%)
Size(mm): <0.03
INCLUSIONS IN OL PSEUDOMORPHS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): TO 0.5 Morphology: SKELETAL LATHS
BELT BUCKLE TEXTURED;
CLINOPYROXENE ( 55%)
Morphology: SPRAYS
MICROLITES AND QUENCH TEXTURED SPRAYS;
MAGNETITE ( 10%)
Size(mm): <0.02 Morphology: DUST-LIKE
TI-MAGN*
Alteration - CLAY MINERALS ( 5-10%)
Replacing: CPX,PLAG,OL
REPLACING QUENCH CPX + PLAG,PSEUDOMORPHS AFTER OL;
CHLORITE ( TR%)
Location: GROUNDMASS Replacing: PLAG,GROUNDMASS
Leg : 61 Top/Bottom Interval(mm): 1060/1080 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 729.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 731.57 Sect/Pc #: 2/PCE 8
ROCK = PLAG-OL MODERATELY MICROPHYRIC BASALT
ALTERED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.1-0.2
PSEUDOMORPHS AFTER CLAY (BROWN),MICROPHENOS;
PLAGIOCLASE ( 5%)
Size(mm): TO 0.5 Morphology: SKELETAL,EUHEDRAL
APPROX COMP AN75,MICROPHENOS;
SPINEL ( TR%)
Size(mm): <0.03
INCLUSIONS IN OL PSEUDOMORPHS,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 30%)
VERY FINE QUENCH TEXTURE;
CLINOPYROXENE ( 43%)
VERY FINE QUENCH TEXTURE;
MAGNETITE ( 15%)
Size(mm): <0.02
TI-MAGN;
GLASS ( 5-10%)
MOSTLY REPLACED BY CLAY MINS*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS,OL,XTLS
BROWN PSEUDOMORPHS AFTER OL;
ZEOLITE ( 5%)
Location: GROUNDMASS, Replacing: GLASS
Location: VEINS
CHLORITE ( 1%)
Replacing: PLAG MICROPHENOS
Leg : 61 Top/Bottom Interval(mm): 120/ 140 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 733.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 733.13 Sect/Pc #: 1/PCE 1A
ROCK = PLAG-CPX MODERATELY MICROPHYRIC BASALT
MASSIVE;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,SPINIFEX
Piece #: HYRY;
Where sampled: SILL INTERIOR BELOW PILLOW COMPLEX*
Phenocrysts- PLAGIOCLASE ( 4%)
Size(mm): <0.2
CLAY-AMPH PSEUDOMORPHS,MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): 0.5
AUGITE,A SINGLE LARGE PHENO;
SPINEL ( TR%)
Size(mm): <0.02
INCLUSIONS IN OL PSEUDOMORPHS*
Groundmass - PLAGIOCLASE ( 12%)
Morphology: SKELETAL,ACICULAR LATHS
APPROX COMP AN70,1.0 MM LONG;
CLINOPYROXENE ( 59%)
Morphology: SPRAYS
SPINIFEX TEXTURED SPRAYS IN GROUNDMASS;
MAGNETITE ( 15%)
Size(mm): <0.02
TI-MAGN*
Alteration - CARBONATE ( <1%)
Location: VUGS Replacing: GROUNDMASS
IN VUGS REPLACING GROUNDMASS*
CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: OL
BROWN*
Vesicles -
Percent: <1
Filling: CALCITE
MAY BE SMALL VESICLES FILLED WITH CALCITE*
Leg : 61 Top/Bottom Interval(mm): 140/ 170 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 733.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 734.66 Sect/Pc #: 2/PCE 2A
ROCK = OL-PLAG MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,SPINIFEX,
SPHERULITIC;
Where sampled: BELOW PILLOW PART IN SILL INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.3-0.5
PSEUDOMORPHS AFTER CLAY,MICROPHENOS;
PLAGIOCLASE ( 4%)
Size(mm): 0.2-0.5
APPROX COMP AN72-75,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 15%)
Morphology: SKELETAL,ACICULAR
0.5 MM LONG,APPROX COMP AN72-75;
CLINOPYROXENE ( 61%)
Morphology: SPRAYS,NEEDLES
QUENCH TEXTURED;
MAGNETITE ( 10%)
Size(mm): <0.005 Morphology: DUST-LIKE
TI-MAGN*
Alteration - AMPHIBOLE
Replacing: OL
REPLACING CORES OF OL XTLS;
CLAY MINERALS ( 5%)
Replacing: CPX,OL MICROPHENOS
BROWN,PSEUDOMORPHS AFTER OL,REPLACING QUENCH CPX
ET AL;
CHLORITE ( TR%)
Leg : 61 Top/Bottom Interval(mm): 610/ 630 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 733.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 735.12 Sect/Pc #: 2/PCE 2E
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE GRAINED,EQUIGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( TR%)
UNCLEAR PSEUDOMORPHS;
PLAGIOCLASE ( TR%)
Size(mm): <0.5 Morphology: SUBHEDRAL
CORRODED,APPROX COMP AN70,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.3 Morphology: LONG ACICULAR LATHS
CLINOPYROXENE ( 50%)
Size(mm): <0.1
AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.1
TI-MAGN*
Alteration - AMPHIBOLE ( TR%)
CLAY MINERALS ( 10%)
Replacing: CPX
BROWN*
CHLORITE ( TR%)
Replacing: OL
REPLACING OL?*
Leg : 61 Top/Bottom Interval(mm): 1220/1240 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 733.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 735.73 Sect/Pc #: 2/PCE 4
ROCK = PLAG-OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,
SPINIFEX-LIKE,INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): <0.5
PSEUDOMORPHS OF CLAY + AMPH,MICROPHENOS;
PLAGIOCLASE ( 3%)
Size(mm): <0.4 Morphology: EUHEDRAL
APPROX COMP AN75,OSCILLATORY ZONING,MICROPHENOS;
SPINEL ( TR%)
Size(mm): <0.003
INCLUSIONS IN OL,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): <0.5 Morphology: ACICULAR LATHS,SKELETAL XTLS
APPROX COMP AN75;
CLINOPYROXENE ( 64%)
Morphology: GRANULES,SPRAYS
TINY SPINIFEX-LIKE GRANULES AND SPRAYS;
MAGNETITE ( 10%)
Size(mm): <0.04 Morphology: DUST-LIKE
TI-MAGN*
Alteration - AMPHIBOLE
Replacing: OL
BROWN,PSEUDOMORPHS AFTER OL;
CLAY MINERALS ( 5%)
Replacing: PYX,OL
BROWN,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 500/ 520 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 733.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 736.51 Sect/Pc #: 3/PCE 1D
ROCK = PLAG-OL MODERATELY MICROPHYRIC BASALT
ALTERED;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,
EQUIGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.3-0.5
PSEUDOMORPHS OF BROWN CLAY,MICROPHENOS;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.4
CORRODED,APPROX COMP AN65?,MICROPHENOS;
SPINEL ( TR%)
Size(mm): <0.003
SMALL INCLUSIONS IN OL,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): <0.2 Morphology: TABULAR,SKELETAL LATHS
APPROX COMP AN68;
CLINOPYROXENE ( 51%)
Size(mm): <0.1 Morphology: GRANULAR
QUENCH;
MAGNETITE ( 5%)
Size(mm): <0.04 Morphology: EUHEDRAL
TI-MAGN*
Alteration - CLAY MINERALS ( 15%)
Location: PATCHES Replacing: ROCK
BROWN*
Vesicles -
Size(mm): 0.4
Percent: <1
Filling: EMPTY
Shape: EGG-SHAPE
ONE VESICLE 0.4 MM IN DIAMETER*
Leg : 61 Top/Bottom Interval(mm): 200/ 220 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 738.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 738.21 Sect/Pc #: 1/PCE 1A
ROCK = OL-PLAG MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,
EQUIGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.3-0.5
PSEUDOMORPHS OF BROWN CLAY,MICROPHENOS;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.8 Morphology: EUHEDRAL
CORRODED,APPROX COMP AN68;
SPINEL ( TR%)
Size(mm): <0.003
INCLUSIONS IN OL,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.1-0.5 Morphology: BLADED,SKELETAL LATHS
APPROX COMP AN70;
CLINOPYROXENE ( 45%)
Size(mm): <0.2 Morphology: GRANULAR
AUGITE,QUENCH;
MAGNETITE ( 10%)
Size(mm): <0.04
TI-MAGN*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX,PLAG,OL MICROPHENOS
BROWN,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 780/ 800 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 738.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 740.29 Sect/Pc #: 2/PCE 3A
ROCK = PLAG-OL MICROPHYRIC BASALT;
Texture: MICROPHYRIC,FINE GRAINED,EQUIGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.2-0.4
MICROPHENOS,RELECTS,PARTLY PSEUDOMORPHED BY CLAY,
SOME FRESH;
PLAGIOCLASE ( 10%)
Size(mm): 0.3-0.6
APPROX COMP AN65;
SPINEL ( TR%)
Size(mm): 0.003
INCLUSIONS IN OL,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): TO 1.0 Morphology: LATHS
APPROX COMP AN65-70;
CLINOPYROXENE ( 40%)
Size(mm): <0.1 Morphology: GRANULAR
AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.08
TI-MAGN*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX,OL MICROPHENOS
BROWN,PSEUDOMORPHS AFTER OL (SOME OL STILL FRESH),
REPLACING CPX ETC*
Leg : 61 Top/Bottom Interval(mm): 1110/1140 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 738.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 743.63 Sect/Pc #: 4/PCE 2B
ROCK = OL-CPX-PLAG MICROPHYRIC BASALT;
Texture: MICROPHYRIC,MIXED INTERSERTAL AND INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 10%)
Size(mm): 0.3-0.5
BROWN CLAY,MICROPHENOS;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.4
APPROX COMP AN75,MICROPHENOS;
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.2
AUGITE,MICROPHENOS;
SPINEL ( TR%)
Size(mm): <0.003
INCLUSIONS IN OL PSEUDOMORPHS,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL,LATHS
APPROX COMP AN70;
CLINOPYROXENE ( 35%)
Size(mm): 0.1-0.2 Morphology: GRANULAR,SUBHEDRAL
AUGITE;
MAGNETITE ( 8%)
Size(mm): 0.08
TI-MAGN*
Alteration - CLAY MINERALS ( 15%)
Location: PATCHES,VEINS Replacing: OL MICROPHENOS
BROWN,PSEUDOMORPHS AFTER OL,THE ROCK IN GENERAL
IS REPLACED*
Leg : 61 Top/Bottom Interval(mm): 900/ 920 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 738.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 744.91 Sect/Pc #: 5/PCE 4
ROCK = OL-PLAG MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,MIXED
HYALOPILITIC AND INTERSERTAL;
Where sampled: SILL MARGINAL ZONE*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 0.1-0.2
CLAY PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( 3%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
APPROX COMP AN70,MICROPHENOS;
SPINEL ( TR%)
Size(mm): <0.02
INCLUSIONS IN OL PSEUDOMORPHS,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.3-0.5 Morphology: THIN ACICULAR LATHS
APPROX COMP AN70;
CLINOPYROXENE ( 68%)
Morphology: GRANULES
QUENCH AND VERY FINE GRANULES;
MAGNETITE ( 10%)
Size(mm): <0.01
TI-MAGN;
GLASS ( 5%)
ALTERED TO SMEC*
Alteration - AMPHIBOLE
Replacing: OL
BROWN;
CLAY MINERALS ( 5%)
Replacing: CPX,PLAG,GLASS,OL
BROWN,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 880/ 900 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 747.00 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 747.89 Sect/Pc #: 1/PCE 8
ROCK = APHYRIC BASALT
CONTACT BETWEEN VARIOLITIC BASALT AND GLASSY
BASALT;
Texture: APHYRIC,VARIOLITIC,VITROPHYRIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( TR%)
Morphology: EUHEDRAL
ALTERED TO ORANGE-BROWN CLAY IN GLASS,FRESH,
AVERAGE SIZE= 0.7 MM;
PLAGIOCLASE ( TR%)
Groundmass - OLIVINE ( TR%)
Size(mm): 0.04 Morphology: EQUIDIMENSIONAL
ONLY IN GLASS;
PLAGIOCLASE ( 5%)
Size(mm): <0.01 Morphology: LATHS
LATHS SHOW DISTINCT ALIGNMENT SUBPARALLEL TO
CONTACT;
MAGNETITE ( 0%)
GLASS ( 95%)
ALTERED MESOSTASIS*
Alteration - CLAY MINERALS ( TR%)
Replacing: OL
ORANGE-BROWN;
CLAY MINERALS ( 95%)
Location: MESOSTASIS
REDDISH BROWN PALAGONITE*
Leg : 61 Top/Bottom Interval(mm): 980/1000 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 747.00 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 749.49 Sect/Pc #: 2/PCE 3
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS THIN SECTION;
Texture: MICRODOLERITIC,SPINIFEX;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.04-0.1 Morphology: SUBHEDRAL
CLAY PSEUDOMORPHS;
PLAGIOCLASE ( 25%)
AVERAGE LENGTH= 0.2 MM,SMALL MICROLITES;
CLINOPYROXENE ( 63%)
Size(mm): <0.04
SPINIFEX AGGREGATES;
MAGNETITE ( 7%)
Morphology: DUST-LIKE
Alteration - CLAY MINERALS ( 5%)
Replacing: OL
GREENISH BROWN PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 1000/1020 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 756.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 757.01 Sect/Pc #: 1/PCE 3B
ROCK = MICRODOLERITE
MORE FINE GRAINED THAN PREVIOUS;
Texture: MICRODOLERITIC WITH VARIOLITIC SPOTS;
Where sampled: NEXT TO GLASSY MARGIN*
Groundmass - OLIVINE ( 3%)
Size(mm): 0.1-0.3
PLAGIOCLASE ( 49%)
AVERAGE LENGTH= 0.3 MM,SMALL MICROLITES,OFTEN
CHAINS OF ORIENTED MICROLITES;
CLINOPYROXENE ( 38%)
Size(mm): 0.04 Morphology: INTERGRANULAR
SPINIFEX-LIKE;
MAGNETITE ( 7%)
Morphology: DUST-LIKE
Alteration - CALCITE ( <1%)
Location: VUGS
CLAY MINERALS ( 10%)
Location: VUGS Replacing: OL
PSEUDOMORPHS*
Vesicles -
Size(mm): 1-4
Percent: 5
Location: GROUNDMASS
Filling: CLAY.MIN,
Shape: IRREGULAR
Filling: CALCITE
VUGS*
Leg : 61 Top/Bottom Interval(mm): 1160/1180 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 756.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 757.17 Sect/Pc #: 1/PCE 3C
ROCK = BASALT TO MICRODOLERITE
CONTACT OF VARIOLITIC BASALT AND SPINIFEX
MICRODOLERITE,THIN MICRODOLERITIC VEINS PENETRATE
TO THE VARIOLITIC ROCK;
Texture: VARIOLITIC,MICRODOLERITIC*
Groundmass - OLIVINE ( TR%)
IN BASALT;
OLIVINE ( 2%)
IN MICRODOLERITE;
PLAGIOCLASE ( 2%)
IN BASALT;
PLAGIOCLASE ( 40%)
IN MICRODOLERITE;
CLINOPYROXENE ( 0%)
IN BASALT;
CLINOPYROXENE ( 49%)
IN MICRODOLERITE,SPINIFEX AGGREGATES;
MAGNETITE ( 0%)
IN BASALT;
MAGNETITE ( 7%)
IN MICRODOLERITE;
GLASS ( 98%)
IN BASALT;
GLASS ( 2%)
IN MICRODOLERITE*
Alteration - CLAY MINERALS ( 98%)
VARIOLITIC BASALT;
CLAY MINERALS ( 7%)
MICRODOLERITE*
Leg : 61 Top/Bottom Interval(mm): 1140/1160 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 756.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 760.15 Sect/Pc #: 3/PCE 3D
ROCK = OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.1-0.6 Morphology: EUHEDRAL
CLAY PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( TR%)
Morphology: ELONGATE PRISMS
Groundmass - PLAGIOCLASE ( 3%)
Morphology: LATHS
SLIGHTLY ALIGNED;
CLINOPYROXENE ( 0%)
MAGNETITE ( 5%)
Size(mm): <0.02 Morphology: DUST-LIKE,THIN CHAINS
DUST-LIKE THIN CHAINS ARE COMMON;
GLASS ( 90%)
SULFIDES ( TR%)
Size(mm): 0.2
INTERSPHERULITE FILLING*
Alteration - CLAY MINERALS ( 92%)
Location: MESOSTASIS Replacing: GLASS,OL MICROPHENOS
REDDISH BROWN PALAGONITE,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 520/ 540 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 756.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 761.03 Sect/Pc #: 4/PCE 2D
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS,WITHOUT GLASS;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.2 MM,MICROPHENOS,CLAY
PSEUDOMORPHS;
PLAGIOCLASE ( TR%)
Groundmass - PLAGIOCLASE ( 32%)
AVERAGE LENGTH= 0.4 MM,APPROX COMP AN62,
MICROLITES;
CLINOPYROXENE ( 61%)
Size(mm): 0.02-0.04
SPINIFEX-LIKE AGGREGATES;
MAGNETITE ( 5%)
Size(mm): 0.02-0.05 Morphology: DUST-LIKE
GLASS ( 0%)
Alteration - CLAY MINERALS ( 2%)
Replacing: OL MICROPHENOS
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 720/ 740 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 756.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 761.23 Sect/Pc #: 4/PCE 2F
ROCK = OL SPARSELY MICROPHYRIC BASALT
CONTACT BETWEEN FINE GRAINED AND MORE COARSE
GRAINED VARIOLITIC BASALTS;
Texture: VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.2 MM,MICROPHENOS,CLAY
PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( <1%)
Morphology: ELONGATE PRISMS
AVERAGE LENGTH= 0.8 MM,APPROX COMP AN62-82*
Groundmass - PLAGIOCLASE ( 2%)
Size(mm): <0.02 Morphology: LATHS
SLIGHT ALIGNMENT;
CLINOPYROXENE ( 0%)
MAGNETITE ( 0%)
GLASS ( 96%)
ALTERED MESOSTASIS*
Alteration - CALCITE ( TR%)
Location: VUGS
CLAY MINERALS ( 96%)
Location: MESOSTASIS Replacing: GLASS,OL MICROPHENOS
PALAGONITE,PSEUDOMORPHS AFTER OL*
Vesicles -
Percent: 1
Location: ALONG CONTACT
Filling: CLAY.MIN,
Shape: IRREGULAR,
Filling: CALCITE
Shape: ELONGATE
VUGS,0.4-1.0 MM LONG*
Leg : 61 Top/Bottom Interval(mm): 550/ 570 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 765.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 765.56 Sect/Pc #: 1/PCE 8A
ROCK = BASALT TO BASALTIC GLASS
CONTACT BETWEEN GLASS AND VARIOLITIC BASALT;
Texture: VITROPHYRIC,VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
IN GLASS,FRESH,MICROPHENOS;
OLIVINE ( 3%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
IN BASALT,ALTERED,MICROPHENOS;
PLAGIOCLASE ( 0%)
IN GLASS;
PLAGIOCLASE ( TR%)
IN BASALT;
SPINEL
Size(mm): <0.02
INCLUSIONS IN OL,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 3%)
Size(mm): <0.02 Morphology: LATHS
IN BASALT;
CLINOPYROXENE ( 1%)
Size(mm): <0.02
IN BASALT,SPINIFEX-LIKE,NUCLEAR AROUND PLAG
MICROPHENOS;
MAGNETITE ( 0%)
IN BASALT;
GLASS ( 99%)
THIS IS THE VITROPHYRIC PART,FRESH,MESOSTASIS;
GLASS ( 93%)
IN BASALT,ALTERED,MESOSTASIS*
Alteration - CLAY MINERALS ( 93%)
Location: MESOSTASIS Replacing: GLASS
IN VARIOLITIC BASALT,PALAGONITE*
Leg : 61 Top/Bottom Interval(mm): 830/ 850 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 765.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 765.84 Sect/Pc #: 1/PCE 8D
ROCK = MICRODOLERITE;
Texture: MICRODOLERITIC WITH SPINIFEX-LIKE SPOTS;
Where sampled: SILL INTERIOR*
Groundmass - OLIVINE ( 3%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.4 MM,CLAY PSEUDOMORPHS;
PLAGIOCLASE ( 55%)
AVERAGE LENGTH= 0.4 MM,SMALL MICROLITES;
CLINOPYROXENE ( 38%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.08 MM,SPINIFEX AGGREGATES;
MAGNETITE ( 4%)
Size(mm): 0.02
Alteration - CLAY MINERALS ( 3%)
Replacing: OL
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 700/ 720 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 765.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 768.71 Sect/Pc #: 3/PCE 4
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.2-0.7 Morphology: EUHEDRAL
DARK BROWN CLAY PSEUDOMORPHS;
PLAGIOCLASE ( 45%)
Morphology: COARSE,TABULAR
AVERAGE LENGTH= 0.4 MM,APPROX COMP AN85,
MICROLITES;
CLINOPYROXENE ( 42%)
Size(mm): 0.1-0.4 Morphology: INTERGRANULAR
MAGNETITE ( 8%)
Size(mm): 0.04-0.12 Morphology: INTERGRANULAR
Alteration - CLAY MINERALS ( 5%)
Replacing: OL
DARK BROWN PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 410/ 430 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 765.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 769.92 Sect/Pc #: 4/PCE 2B
ROCK = MICRODOLERITE
MORE FINE GRAINED THAN PREVIOUS WITH SPINIFEX
SPOTS;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.4-1.2 Morphology: EUHEDRAL
CLAY PSEUDOMORPHS;
PLAGIOCLASE ( <1%)
Morphology: TABULAR
0.4-1.0 MM LONG,APPROX COMP AN76-87*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
ALTERED;
PLAGIOCLASE ( 56%)
AVERAGE LENGTH= 0.1 MM,APPROX COMP AN62,
MICROLITES;
CLINOPYROXENE ( 36%)
Size(mm): 0.04-0.1 Morphology: INTERGRANULAR
SPINIFEX AGGREGATES;
MAGNETITE ( 6%)
Morphology: INTERGRANULAR
AVERAGE SIZE= 0.06 MM*
Alteration - CARBONATE ( TR%)
IN CLAY PSEUDOMORPHS AFTER OL;
CLAY MINERALS ( 5%)
Replacing: OL
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 710/ 730 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 774.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 776.22 Sect/Pc #: 2/PCE 1C
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.3-0.7
APPROX COMP AN76;
CLINOPYROXENE ( 45%)
Size(mm): 0.5-0.8
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.2
TI-MAGN*
Alteration - CHLORITE ( \[%)
Replacing: CPX
CLAY MINERALS ( 5%)
Replacing: CPX
BROWN,REPLACING CPX ET AL*
Leg : 61 Top/Bottom Interval(mm): 150/ 170 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 774.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 777.16 Sect/Pc #: 3/PCE 1A
ROCK = DOLERITE;
Texture: OPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.5-0.8 Morphology: EUHEDRAL-ANHEDRAL
APPROX COMP AN65;
CLINOPYROXENE ( 43%)
Size(mm): 0.6-0.9 Morphology: PLATES
AUGITE,OPHITIC PLATES;
MAGNETITE ( 10%)
Size(mm): <0.25
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRIC AGGREGATES;
AMPHIBOLE ( 2-3%)
Alteration - COMBINATION ( 5%)
Replacing: ALL.MINS
INCLUDES CLAY + CHLORITE,BROWN*
Leg : 61 Top/Bottom Interval(mm): 1090/1110 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 774.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 782.60 Sect/Pc #: 6/PCE 1K
ROCK = DOLERITE
EXACTLY LIKE 50-3 (15-17) EXCEPT FOR MORE AMPH +
MORE GRANOPHYRES + MORE CHLORITE + COARSER GRAIN
SIZE;
Texture: GRANOPHYRIC,OPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.5-0.8 Morphology: EUHEDRAL+ANHEDRAL
APPROX COMP AN65;
CLINOPYROXENE ( 40%)
Size(mm): 0.6-0.9 Morphology: PLATES
AUGITE,OPHITIC PLATES;
MAGNETITE ( 10%)
Size(mm): <0.25
COMBINATION ( 3%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRIC AGGREGATES;
AMPHIBOLE ( 2-3%)
APATITE ( <1%)
Alteration - COMBINATION ( 5%)
Replacing: ALL.MINS
INCLUDES CLAY + CHLORITE (MORE CHLORITE THAN IN
PREVIOUS THIN SECTION),BROWN*
Leg : 61 Top/Bottom Interval(mm): 200/ 220 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 778.50 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 778.71 Sect/Pc #: 1/PCE 1C
ROCK = MICRODOLERITE;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Groundmass - OLIVINE ( 2%)
Morphology: EUHEDRAL,ANHEDRAL
AVERAGE SIZE= 0.2 MM,ALTERED;
PLAGIOCLASE ( 45%)
APPROX COMP AN60-68,MICROLITES*
CLINOPYROXENE ( 46%)
Morphology: EQUIDIMENSIONAL,IRREGULAR
AVERAGE SIZE= 0.2 MM,MORE COARSE;
MAGNETITE ( 7%)
Morphology: INTERGRANULAR
AVERAGE SIZE 0.1 MM;
COMBINATION ( TR%)
Size(mm): 0.08 Morphology: INTERGRANULAR
INCLUDES QUARTZ + ALK.SPAR IN GRANOPHYRIC AGGREGATE
AND AS AUTONOMOUSE GRAINS;
SULFIDE ( TR%)
Size(mm): 0.15 Morphology: ELONGATE PLATES
PROBABLY PYRITE*
Alteration - CLAY MINERALS ( 5%)
Replacing: OL,PLAG
GRAYISH GREEN,PSEUDOMORPHS AFTER OL?*
Leg : 61 Top/Bottom Interval(mm): 1470/1500 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 778.50 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 782.99 Sect/Pc #: 3/PCE 1L
ROCK = MICRODOLERITE TO BASALT
GRADUAL TRANSITION FROM MICRODOLERITE TO A
HORNFELSIC-LIKE ROCK;
Texture: MICRODOLERITIC-EQUIGRANULAR (MOSAIC),QUENCH;
Where sampled: GLASSY SILL BOTTOM*
Phenocrysts- OLIVINE ( 1%)
Morphology: EUHEDRAL
IN BASALT,AVERAGE SIZE= 0.2 MM,MICROPHENOS,
ALTERED;
PLAGIOCLASE ( TR%)
IN BASALT,AVERAGE LENGTH= 0.4 MM,MICROPHENOS*
Groundmass - OLIVINE ( 1%)
Morphology: EUHEDRAL,IRREGULAR
IN BASALT,AVERAGE SIZE= <0.04 MM;
OLIVINE ( 2%)
Morphology: EUHEDRAL
IN MICRODOLERITE,AVERAGE SIZE= 0.3 MM;
PLAGIOCLASE ( 31%)
Morphology: LATHS,EQUIDIMENSIONAL
IN BASALT,AVERAGE LENGTH= <0.02 MM,SMALL
MICROLITES;
PLAGIOCLASE ( 55%)
Morphology: LATHS,EQUIDIMENSIONAL
IN MICRODOLERITE,AVERAGE LENGTH= 0.3 MM,SMALL
MICROLITES;
CLINOPYROXENE ( 60%)
Morphology: EQUIDIMENSIONAL
IN BASALT,AVERAGE SIZE= <0.02 MM,POIKILOPHITIC
AGGREGATES;
CLINOPYROXENE ( 38%)
Morphology: EQUIDIMENSIONAL
IN MICRODOLERITE,AVERAGE SIZE= 0.1 MM,
POIKILOPHITIC AGGREGATES;
MAGNETITE ( 8%)
Morphology: DUST-LIKE
IN BASALT,AVERAGE SIZE= 0.04-0.12 MM;
MAGNETITE ( 5%)
Morphology: DUST-LIKE
IN MICRODOLORITE,AVERAGE SIZE= 0.04-0.12 MM;
GLASS ( 0%)
IN BASALT;
GLASS ( 0%)
IN MICRODOLORITE*
Alteration - CLAY MINERALS ( 5%)
Replacing: OL
GRAYISH GREENISH BROWN,PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 50/ 70 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 778.50 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 783.06 Sect/Pc #: 4/PCE 1A
ROCK = MICRODOLERITE;
Texture: MICRODOLERITIC;
Where sampled: SILL BOTTOM*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL
ALTERED,MICROPHENOS;
PLAGIOCLASE ( TR%)
0.5 MM LONG*
Groundmass - OLIVINE ( 1%)
Size(mm): <0.04 Morphology: IRREGULAR
ALTERED;
PLAGIOCLASE ( 40%)
AVERAGE LENGTH= 0.16 MM,SMALL MICROLITES,DISTINCT
ALIGNMENT IS OBSERVED;
CLINOPYROXENE ( 54%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.04 MM;
MAGNETITE ( 5%)
Size(mm): <0.04 Morphology: DUST-LIKE
Alteration - CLAY MINERALS ( 5%)
Replacing: OL,PLAG
PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 510/ 540 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 787.50 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 789.53 Sect/Pc #: 2/PCE 1
ROCK = DOLERITE
ALTERED;
Texture: DIABASIC;
Where sampled: SILL INTERIOR*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.2-0.3
PSEUDOMORPHS (POSSIBLY COULD BE CPX PSEUDOMORPHS);
PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
APPROX COMP AN65-68;
CLINOPYROXENE ( 40%)
Size(mm): 0.3-0.5
AUGITE,OPHITIC TEXTURE;
MAGNETITE ( 5%)
Size(mm): 0.04
TI-MAGN*
Alteration - CLAY MINERALS ( 10%)
Location: PATCHES Replacing: OL
GREEN CLAY PSEUDOMORPHS AFTER OL? OR IN VARIOLITIC
INTERSTITIAL PATCHES*
Leg : 61 Top/Bottom Interval(mm): 490/ 510 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 787.50 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 792.50 Sect/Pc #: 4/PCE 2
ROCK = OL-PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,FINE GRAINED,
HYALOPILITIC;
Where sampled: NEAR CHILL ZONE OF PILLOW*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.2-0.9
ZEOLITE + CLAY + AMPH PSEUDOMORPHS;
PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.8 Morphology: EUHEDRAL
APPROX COMP AN70;
SPINEL ( TR%)
Size(mm): <0.004
INCLUSIONS IN OL PSEUDOMORPHS*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): TO 0.7 Morphology: THIN SKELETAL LATHS
IN GROUNDMASS;
CLINOPYROXENE ( 46%)
QUENCH BUNDLES IN GROUNDMASS,MICROLITES;
MAGNETITE ( 10%)
Size(mm): <0.004 Morphology: DUST-LIKE
TI-MAGN*
GLASS ( 30%)
DEVITRIFIED AND/OR REPLACED BY BROWN CLAY*
Alteration - CLAY MINERALS ( 2%)
Replacing: OL PHENOS
PSEUDOMORPHS,GLASS IS DEVITRIFIED AND/OR REPLACED
BY BROWN CLAY;
ZEOLITE ( 2%)
Replacing: OL PHENOS
PSEUDOMORPHS;
OTHER
Replacing: OL PHENOS
AMPH OR HYDROMICA PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 690/ 710 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 801.00 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 801.70 Sect/Pc #: 1/PCE 6
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,VARIOLITIC-HYALOPILITIC,
GLASSY-FINE GRAINED;
Where sampled: GLASSY PILLOW MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.1-0.2
CLAY + ZEOLITE PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.9
APPROX COMP AN75-70;
SPINEL ( TR%)
Size(mm): <0.003
INCLUSIONS IN OL PSEUDOMORPHS*
Groundmass - PLAGIOCLASE
Morphology: SKELETAL
VARIABLE PERCENTAGE,MICROLITES IN GROUNDMASS;
CLINOPYROXENE
VARIABLE PERCENTAGE,QUENCH TEXTURED BUNDLES IN
GROUNDMASS;
GLASS
VARIABLE PERCENTAGE,VARIABLY DEVITRIFIED OR
REPLACED BY CLAYS*
Alteration - CLAY MINERALS
Replacing: PLAG,OL MICROPHENOS,GLASS
PERCENTAGE VARIABLE,PSEUDOMORPHS AFTER OL,GLASS
IS VARIOUSLY DEVITRIFIED OR REPLACED BY CLAYS;
ZEOLITE
Replacing: PLAG,OL MICROPHENOS,GLASS
PERCENTAGE VARIABLE,PSEUDOMORPHS AFTER OL;
CHLORITE
Replacing: PLAG,OL MICROPHENOS,GLASS
Leg : 61 Top/Bottom Interval(mm): 650/ 680 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 806.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 807.17 Sect/Pc #: 1/PCE 6
ROCK = MICRODOLERITE
WITH SPINIFEX SPOTS;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.3 MM,MICROPHENOS,ALTERED;
PLAGIOCLASE ( TR%)
Morphology: ELONGATE PRISMS
AVERAGE LENGTH= 0.4 MM,MICROPHENOS,APPROX COMP
AN67;
CLINOPYROXENE ( TR%)
Morphology: TABULAR
AVERAGE SIZE= 0.3 MM,MICROPHENOS,POIKILITIC TABLES
SURROUNDED BY FINE-MEDIUM GRAINED AGGREGATES*
Alteration - CLAY MINERALS ( 5%)
Replacing: OL MICROPHENOS
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 1450/1470 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 806.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 807.96 Sect/Pc #: 1/PCE 4L
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VARIOLITIC-INTERSERTAL;
Where sampled: GLASSY SILL BOTTOM*
Groundmass - OLIVINE ( 1%)
AVERAGE SIZE= 0.1 MM,GLOMEROPORPHYRITIC CLUSTERS;
PLAGIOCLASE ( 5%)
Size(mm): <0.02 Morphology: LATHS
CLINOPYROXENE ( TR%)
MAGNETITE ( 5%)
Size(mm): <0.02 Morphology: DUST-LIKE
GLASS ( 89%)
ALTERED MESOSTASIS*
Alteration - CLAY MINERALS ( 90%)
Location: MESOSTASIS Replacing: GLASS
PROBABLY PALAGONITE*
Leg : 61 Top/Bottom Interval(mm): 960/ 980 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 806.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 808.97 Sect/Pc #: 2/PCE 9
ROCK = ZEOLITE VEIN IN GLASS;
Alteration - CLAY MINERALS ( 15%)
Location: VEIN MARGINS Replacing: GLASS,ZEOLITES
ZEOLITE ( 85%)
Location: VEIN INTERIOR
REPLACING VEIN INFILLING,CRYSTALLINE AND FIBROUS*
Leg : 61 Top/Bottom Interval(mm): 1070/1090 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 806.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 809.08 Sect/Pc #: 2/PCE 10
ROCK = GLASS TO BASALT
CONTACT OF GLASS AND VARIOLITIC BASALT;
Texture: SPARSELY PORPHYRITIC,VARIOLITIC,VITROPHYRIC*
Phenocrysts- OLIVINE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.2 MM,MICROPHENOS,ALTERED;
PLAGIOCLASE ( 1%)
AVERAGE LENGTH= 0.5 MM;
SPINEL ( TR%)
INCLUSIONS IN OL*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): <0.02 Morphology: LATHS
MAGNETITE ( 0%)
GLASS ( 95%)
MESOSTASIS,ALTERED IN VARIOLITIC BASALT AND FRESH
IN VITROPHYRE*
Alteration - CLAY MINERALS ( 93%)
Location: MESOSTASIS Replacing: GLASS
PROBABLY PALAGONITE,ALTERED IN VARIOLITIC BASALT
AND FRESH IN VITROPHYRIC BASALT*
Leg : 61 Top/Bottom Interval(mm): 1460/1480 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 815.50 Rock Type: IGNEOUS
Core: 57 Sample Midpoint(m) : 816.97 Sect/Pc #: 1/PCE 13
ROCK = OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED,
INTERSERTAL-EQUIGRANULAR;
Where sampled: SILL OR FLOW INTERIOR*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 0.1-0.2
CLAY + ZEOLITE PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( TR%)
Size(mm): 0.2-0.3 Morphology: EUHEDRAL,SKELETAL
APPROX COMP AN70,MICROPHENOS;
SPINEL
Size(mm): <0.003
INCLUSIONS IN OL PSEUDOMORPHS*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): <0.2 Morphology: SKELETAL LATHS
MICROLITES;
CLINOPYROXENE ( 56%)
Size(mm): TO 0.1 Morphology: BUNDLES,GRANULES
AUGITE,QUENCH;
MAGNETITE ( 10%)
Size(mm): <0.01
TI-MAGN;
GLASS ( 5-10%)
Alteration - CLAY MINERALS ( 5%)
Replacing: GLASS,OL MICROPHENOS,PLAG
PSEUDOMORPHS AFTER OL;
ZEOLITE
Replacing: GLASS,OL MICROPHENOS,PLAG
PERCENTAGE VARIABLE,PSEUDOMORPHS AFTER OL;
CHLORITE
Replacing: GLASS,OL MICROPHENOS,PLAG
PERCENTAGE VARIABLE*
Leg : 61 Top/Bottom Interval(mm): 190/ 210 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 824.50 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 826.20 Sect/Pc #: 2/PCE 2
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,INTERSERTAL-EQUIGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.1-0.2
CLAY + CHLORITE PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( <1%)
Size(mm): 0.1-0.3
CLAY PSEUDOMORPHS,MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): 0.1-0.2 Morphology: ANHEDRAL
AUGITE,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 20%)
Morphology: SKELETAL LATHS
<0.5 MM LONG,IN GROUNDMASS;
CLINOPYROXENE ( 58%)
Morphology: SPRAYS,GRANULES
QUENCH;
MAGNETITE ( 7%)
Size(mm): <0.1
TI-MAGN*
Alteration - COMBINATION ( 15%)
Location: VEINS Replacing: ALL.MINS
INCLUDES CLAY + CHLORITE,BROWN CLAY REPLACES
EVERYTHING AND GREEN CLAY IS IN VEINS,PSEUDOMORPHS
AFTER OL + PLAG*
Leg : 61 Top/Bottom Interval(mm): 410/ 430 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 824.50 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 827.92 Sect/Pc #: 3/PCE 2B
ROCK = DOLERITE
ALTERED;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.1
POSSIBLE CLAY PSEUDOMORPHS OF OL (COULD BE CPX
PSEUDOMORPHS)*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.3 Morphology: SUBHEDRAL,LATHS
APPROX COMP AN57;
CLINOPYROXENE ( 48%)
Size(mm): 0.1-0.2
AUGITE,SUBOPHITIC;
MAGNETITE ( 7%)
Size(mm): <0.1 Morphology: SKELETAL
TI-MAGN*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX
GREEN CLAY REPLACING CPX (MOSTLY) BUT COULD BE
SOME PSEUDOMORPHS AFTER OL MICROPHENOS*
Leg : 61 Top/Bottom Interval(mm): 1320/1340 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 833.50 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 837.83 Sect/Pc #: 3/PCE 2
ROCK = PLAG-OL SPARSELY MICROPHYRIC BASALT;
Texture: SPARSELY MICROPHYRIC,OPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.1-0.5
CLAY-CALCITE PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( 1%)
Size(mm): 0.2-0.6 Morphology: SUBHEDRAL,LATHS
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL
APPROX COMP AN60;
CLINOPYROXENE ( 43%)
Size(mm): <0.2 Morphology: GRANULES,SUBHEDRAL
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.1
TI-MAGN;
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRES PERHAPS;
APATITE ( TR%)
Morphology: ACICULAR
MASSES OF ACICULAR XTLS IN INTERSTITIAL FE-RICH
REGION*
Alteration - CALCITE
Replacing: OL MICROPHENOS
PERCENTAGE VARIABLE,CLAY-CALCITE PSEUDOMORPHS
AFTER OL;
CLAY MINERALS ( 10%)
Replacing: CPX
BROWN AND GREEN CLAY REPLACING CPX (MOSTLY)*
Leg : 61 Top/Bottom Interval(mm): 1080/1110 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 833.50 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 842.10 Sect/Pc #: 6/PCE 7
ROCK = PLAG-CPX SPARSELY MICROPHYRIC BASALT
ALTERED;
Texture: SPARSELY MICROPHYRIC,MIXED INTERSERTAL +
INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.1-0.3
PSEUDOMORPHS (MAY BE CPX),MICROPHENOS;
PLAGIOCLASE ( 1%)
Size(mm): 0.2-0.5
APPROX COMP AN68,MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): 0.1-0.3
AUGITE,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AN65;
CLINOPYROXENE
Size(mm): <0.1-0.15 Morphology: GRANULES
QUENCH PHASE AND GRANULES,AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.005 Morphology: GRANULES
TI-MAGN*
Alteration - CLAY MINERALS ( 10%)
Replacing: ALL.MINS
BROWN CLAY REPLACING EVERYTHING*
Leg : 61 Top/Bottom Interval(mm): 1310/1330 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 833.50 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 842.32 Sect/Pc #: 6/PCE 8
ROCK = PLAG-CPX MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,VARIOLITIC;
Where sampled: FLOW MARGIN*
Phenocrysts- OLIVINE ( TR%)
PSEUDOMORPHS MAY BE CPX;
PLAGIOCLASE ( 1%)
Size(mm): <0.2 Morphology: EUHEDRAL,TABULAR
APPROX COMP AN65,MICROPHENOS;
CLINOPYROXENE ( 1%)
Size(mm): 0.1-0.15 Morphology: EUHEDRAL-SUBHEDRAL
AUGITE,SECTOR ZONING,MICROPHENOS;
SPINEL ( TR%)
Size(mm): <0.003
INCLUSIONS IN PLAG*
Groundmass - MAGNETITE ( 10%)
Size(mm): 0.002 Morphology: DUST-LIKE
TI-MAGN;
GLASS ( 88%)
GROUNDMASS IS VARIOLITIC,MOSTLY VERY FINE QUENCH,
MOST REPLACED TO VARIABLE DEGREES BY CLAY,NO FRESH
GLASS PRESENT*
Alteration - AMPHIBOLE
Replacing: CPX
REPLACING CPX ET AL;
CLAY MINERALS
Location: QUENCH PHASES Replacing: GLASS,MICROPHENOS
PERCENTAGE VARIABLE,REPLACING QUENCH PHASES +
MICROPHENOS + GLASS*
Leg : 61 Top/Bottom Interval(mm): 990/1010 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 842.50 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 846.50 Sect/Pc #: 3/PCE 4
ROCK = PLAG-OL SLIGHTLY MICROPHYRIC BASALT;
Texture: SLIGHTLY MICROPHYRIC,HYALOPILITIC-INTERSERTAL;
Where sampled: SILL BOTTOM*
Phenocrysts- OLIVINE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.3 MM,MICROPHENOS,ALTERED;
PLAGIOCLASE ( 1%)
AVERAGE LENGTH= 0.4 MM,MICROPHENOS,APPROX COMP
AN85*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): <0.05 Morphology: LATHS
CLINOPYROXENE ( 1%)
Morphology: IRREGULAR
AVERAGE SIZE 0.08 MM;
MAGNETITE ( 3%)
Morphology: DUST-LIKE
AVERAGE SIZE= 0.06;
GLASS ( 89%)
ALTERED*
Alteration - CLAY MINERALS ( 90%)
Replacing: OL MICROPHENOS,GLASS
GREENISH BROWN PSEUDOMORPHS AFTER OL AND REDDISH
BROWN CLAY REPLACING GLASS*
Leg : 61 Top/Bottom Interval(mm): 300/ 320 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 851.50 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 851.81 Sect/Pc #: 1/PCE 4
ROCK = VITROPHYRIC TO VARIOLITIC BASALT
CONTACT OF VITROPHYRIC AND VARIOLITIC BASALTS,
THIN (5.2 MM) BAND OF ENRICHMENT IN GLASS IS
LOCATED IN VARIOLITIC BASALT IN CONTACT WITH
GLASS;
Texture: VARIOLITIC-VITROPHYRIC;
Where sampled: TOP OF SILL*
Groundmass - OLIVINE
FRESH OL IN VITROPHYRIC BASALT;
PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
PYRITE
Alteration - CLAY MINERALS ( 95%)
Replacing: GLASS
ONLY REPLACING GLASS IN VARIOLITIC BASALT--GLASS
IN THE VITROPHYRIC BASALT IS FRESH*
Leg : 61 Top/Bottom Interval(mm): 160/ 180 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 851.50 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 854.67 Sect/Pc #: 3/PCE 1C
ROCK = MICRODOLERITE;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.4 MM,MICROPHENOS;
PLAGIOCLASE ( 1%)
AVERAGE LENGTH= 0.6 MM,ZONED*
Groundmass - PLAGIOCLASE ( 52%)
AVERAGE LENGTH= 0.3 MM,SMALL MICROLITES;
CLINOPYROXENE ( 39%)
AVERAGE SIZE= 0.12 MM,INTERSTITIAL;
MAGNETITE ( 7%)
Morphology: IRREGULAR
AVERAGE SIZE= 0.1 MM;
GLASS ( 1%)
PERCENTAGE UNCERTAIN*
Alteration - CARBONATE ( TR%)
Location: INTERSTITIAL Replacing: OL MICROPHENOS
CLAY MINERALS ( 5%)
Replacing: OL MICROPHENOS
Leg : 61 Top/Bottom Interval(mm): 630/ 650 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 860.50 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 861.14 Sect/Pc #: 1/PCE 1E
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
MORE FINE GRAINED THAN PREVIOUS,INTERSTICES OF
GLASS SPOTS INFILLED BY MICRODOLERITIC AGGREGATES,
GLOMEROPORPHYRITIC;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL-
MICRODOLERITIC;
Where sampled: BOUNDARY OF TWO SILLS*
Phenocrysts- OLIVINE ( 1%)
Morphology: ROUNDED
AVERAGE SIZE= 0.2 MM,MICROPHENOS,ALTERED;
PLAGIOCLASE ( 3%)
Morphology: ELONGATE PRISMS,TABULAR
AVERAGE LENGTH 1.2 MM,APPROX COMP 67-72,ZONED;
CLINOPYROXENE
Morphology: EQUIGRANULAR
AVERAGE SIZE= 0.4 MM,MICROPHENOS*
Groundmass - PLAGIOCLASE
Morphology: LATHS
PERCENTAGE VARIABLE,MICROLITES;
CLINOPYROXENE
Morphology: IRREGULAR
MAGNETITE ( 0-5%)
GLASS ( 80%)
MESOSTASIS*
Alteration - CLAY MINERALS ( 90%)
Location: MESOSTASIS Replacing: GLASS,OL MICROPHENOS
PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 100/ 120 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 860.50 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 862.11 Sect/Pc #: 2/PCE 1A
ROCK = MICRODOLERITE
MORE COARSE GRAINED THAN PREVIOUS;
Texture: MICRODOLERITIC,GLASSY;
Where sampled: SILL INTERIOR
NEAR TOP*
Groundmass - OLIVINE ( 1%)
Morphology: ROUNDED
AVERAGE SIZE= 0.4 MM;
PLAGIOCLASE ( 59%)
AVERAGE LENGTH= 0.4 MM,MICROLITES;
CLINOPYROXENE ( 32%)
Morphology: EQUIDIMENSIONAL
AVERAGE SIZE= 0.2 MM;
MAGNETITE ( 5%)
Morphology: DUST-LIKE
AVERAGE SIZE= 0.08 MM;
GLASS ( 3%)
INTERSTITIAL*
Alteration - CLAY MINERALS ( 5%)
Location: INTERSTITIAL Replacing: GLASS,OL
PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 00/ 30 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 860.50 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 865.02 Sect/Pc #: 4/PCE 1
ROCK = PLAG-CPX MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,VARIOLITIC;
Where sampled: SILL TOP*
Phenocrysts- OLIVINE ( TR%)
Morphology: EUHEDRAL
AVERAGE SIZE= 0.5 MM;
PLAGIOCLASE ( 1%)
AVERAGE LENGTH= 0.2 MM,MICROPHENOS;
CLINOPYROXENE ( 1%)
AVERAGE SIZE= 0.08 MM,MICROPHENOS*
Alteration - CLAY MINERALS ( 95%)
Location: MESOSTASIS
Leg : 61 Top/Bottom Interval(mm): 190/ 210 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 864.50 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 864.70 Sect/Pc #: 1/PCE 2
ROCK = HYALOPILITIC BASALT TO MICRODOLERITE
CONTACT OF HYALOPILITIC BASALT AND FINE GRAINED
MICRODOLERITE,MICROINTRUSIONS OF MAGMA FROM
INTERIOR TO CHILLED MARGIN OF SILL;
Texture: HYALOPILITIC FINE GRAINED;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
IN HYALOPILITIC BASALT;
PLAGIOCLASE ( TR%)
IN HYALOPILITIC BASALT;
MAGNETITE
Morphology: OCTAHEDRONS
Alteration - CARBONATE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 360/ 380 Describer: Shcheka, S.A.
Hole: 462A Top of Core Depth(m) : 864.50 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 864.87 Sect/Pc #: 1/PCE 4A
ROCK = VARIOLITIC TO HYALOPILITIC BASALT
CONTACT OF VARIOLITIC AND HYALOPILITIC BASALTS,
GLASSY SPOTTED ZONE ON CONTACT IS OBSERVED,
INTERIORS OF SPOTS ARE INFILLED BY MICRODOLERITIC
AGGREGATES;
Texture: VARIOLITIC,HYALOPILITIC;
Where sampled: GLASSY MARGIN*
Groundmass - OLIVINE ( 2%)
ONLY IN THE VARIOLITIC BASALT*
Alteration - CLAY MINERALS ( 90%)
Location: MESOSTASIS Replacing: GLASS,OL
REDDISH BROWN*
Vesicles -
Percent: 0
Leg : 61 Top/Bottom Interval(mm): 200/ 220 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 869.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 869.71 Sect/Pc #: 1/PCE 1B
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,MICRODOLERITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 38%)
Size(mm): 0.2-0.4
APPROX COMP AN68-70;
CLINOPYROXENE ( 40%)
Size(mm): <0.2
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.08 Morphology: IRREGULAR
TI-MAGN;
GLASS ( 7%)
SMALL INTERSTITIAL PATCHES (ALTERED)*
Alteration - CLAY MINERALS ( 10%)
Replacing: GLASS,CPX
BROWN*
Leg : 61 Top/Bottom Interval(mm): 1220/1250 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 869.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 870.74 Sect/Pc #: 1/PCE 1E
ROCK = DOLERITE
ALTERED;
Texture: MICRODIABASIC;
Where sampled: FINE GRAINED ZONE OF SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL
APPROX COMP AN68-71;
CLINOPYROXENE ( 45%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.08 Morphology: SKELETAL
TI-MAGN*
Alteration - CLAY MINERALS ( 10%)
Replacing: CPX
BROWN*
Leg : 61 Top/Bottom Interval(mm): 600/ 620 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 869.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 871.61 Sect/Pc #: 2/PCE 1C
ROCK = DOLERITE
ALTERED;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL
APPROX COMP AN75-77;
CLINOPYROXENE ( 45%)
Size(mm): 0.2-0.35 Morphology: SUBHEDRAL
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.1
TI-MAGN;
GLASS ( 5%)
INTERSTITIAL PATCHES*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX,GLASS
BROWN*
Leg : 61 Top/Bottom Interval(mm): 300/ 320 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 869.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 874.31 Sect/Pc #: 4/PCE 1B
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,MIXED EQUIGRANULAR + MICRODIABASIC;
Where sampled: FINE GRAINED ZONE OF SILL INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.3-0.5
CLAY PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( <1%)
Size(mm): 0.3-0.5
APPROX COMP AN64-66,MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): 0.5-0.2
AUGITE,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.2 Morphology: SUBHEDRAL
APPROX COMP AN65;
CLINOPYROXENE ( 43%)
Size(mm): <0.2 Morphology: SUBHEDRAL
AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.04
TI-MAGN*
Alteration - CLAY MINERALS ( 7%)
Replacing: ALL.MINS
BROWN CLAY REPLACING EVERYTHING,PSEUDOMORPHS AFTER
OL*
Leg : 61 Top/Bottom Interval(mm): 600/ 620 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 876.50 Rock Type: IGNEOUS
Core: 65 Sample Midpoint(m) : 878.61 Sect/Pc #: 2/PCE 1
ROCK = DOLERITE
ALTERED;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.3-0.5
CLAY PSEUDOMORPHS WHICH COULD BE CPX,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AN63;
CLINOPYROXENE ( 45%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.1 Morphology: SKELETAL
TI-MAGN;
GLASS ( 2%)
INTERSTITIAL PATCHES*
Alteration - CLAY MINERALS ( 10%)
POSSIBLE PSEUDOMORPHS AFTER OL MICROPHENOS (COULD
BE CPX)*
Leg : 61 Top/Bottom Interval(mm): 200/ 220 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 883.00 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 883.21 Sect/Pc #: 1/PCE 1
ROCK = PLAG-CPX MODERATELY MICROPHYRIC BASALT
MASSIVE BASALT SILL;
Texture: MODERATELY MICROPHYRIC,SUBOPHITIC-INTERGRANULAR;
Where sampled: NEAR SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5-6%)
Size(mm): 0.4-0.5 Morphology: TABULAR,PRISMATIC
APPROX COMP AN65,MICROPHENOS;
CLINOPYROXENE ( 3-4%)
Size(mm): 0.4 Morphology: SUBHEDRAL
SOME TYPES ARE PALE GREENISH,MICROPHENOS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.3 Morphology: SUBHEDRAL
MICROLITES;
CLINOPYROXENE ( 45%)
Size(mm): 0.3 Morphology: SUBHEDRAL
MICROLITES;
MAGNETITE ( 3-5%)
Size(mm): <0.2 Morphology: SKELETAL,DUST-LIKE
TWO TYPES: 1)LARGE SKELETAL (THIS TYPE IS CLOSELY
ASSOCIATED WITH ALTERED ZONE AND MAY BE SECONDARY)
AND 2)SMALL DUST-LIKE*
Alteration - CALCITE
Location: VEIN MARGINS
ZEOLITE
Location: VEIN INTERIOR
CLAY MINERALS ( 5-10%)
Location: VEINS Replacing: PLAG,CPX
SOMETIMES IN BETWEEN CALCITE AND ZEOLITE IN VEINS*
Leg : 61 Top/Bottom Interval(mm): 330/ 350 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 883.00 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 892.34 Sect/Pc #: 7/PCE 1B
ROCK = DOLERITE
MASSIVE DOLERITE SILL;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 25%)
Size(mm): 0.4-1.0 Morphology: TABULAR-PRISMATIC
CLINOPYROXENE ( 15%)
Size(mm): 0.5-1.0 Morphology: SUBHEDRAL
MAGNETITE ( 3%)
Morphology: SKELETAL
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): <0.3
MICROLITES;
CLINOPYROXENE ( 25%)
Size(mm): <0.4
MICROLITES;
MAGNETITE ( 3%)
Size(mm): <0.2 Morphology: SKELETAL,DUST-LIKE
COMBINATION ( 3-4%)
INCLUDES QUARTZ + ALK.SPAR, INTERGROWN, FORMING
MICROPEGMATITE,COEXISTS WITH SKELETAL MAGN;
HORNBLENDE
GREEN;
APATITE
Alteration - CLAY MINERALS ( 5-6%)
Replacing: PLAG
CHLORITE ( 1-3%)
Location: SPOTS Replacing: CPX
Leg : 61 Top/Bottom Interval(mm): 80/ 100 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 892.00 Rock Type: IGNEOUS
Core: 67 Sample Midpoint(m) : 892.09 Sect/Pc #: 1/PCE 1B
ROCK = DOLERITE
MASSIVE DOLERITE SILL;
Texture: OPHITIC-INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.8-1.2 Morphology: PRISMATIC
APPROX COMP AN60;
CLINOPYROXENE ( 30%)
Size(mm): 0.8-1.2 Morphology: ANHEDRAL
MAGNETITE ( 1-3%)
Size(mm): 0.4-0.8 Morphology: SKELETAL
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): <0.7 Morphology: PRISMATIC-TABULAR
MICROLITES;
CLINOPYROXENE ( 30%)
Size(mm): <0.7 Morphology: ANHEDRAL-SUBHEDRAL
MICROLITES;
MAGNETITE ( 4%)
Size(mm): <0.4 Morphology: SKELETAL,DUST-LIKE
COMBINATION ( 4%)
INCLUDES QUARTZ + ALK.SPAR, INTERGROWN, FORMING
MICROPEGMATITE,COEXISTS WITH SKELETAL MAGN;
HORNBLENDE ( TR%)
GREEN;
APATITE ( TR%)
Alteration - CLAY MINERALS ( 5-10%)
Location: SPOTS Replacing: PLAG
CHLORITE ( 3-5%)
Location: SPOTS Replacing: CPX
CPX ALTERED TO CHLORITE + MAGN*
Leg : 61 Top/Bottom Interval(mm): 1240/1260 Describer: Tokuyama, H.
Hole: 462A Top of Core Depth(m) : 892.00 Rock Type: IGNEOUS
Core: 67 Sample Midpoint(m) : 900.75 Sect/Pc #: 6/PCE 1I
ROCK = DOLERITE
MASSIVE DOLERITE SILL;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: NEAR SILL INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 1
PSEUDOMORPH ALTERED TO CLAY;
PLAGIOCLASE ( 5-6%)
Size(mm): 0.4-0.5 Morphology: TABULAR,PRISMATIC
APPROX COMP AN65,MICROPHENOS;
CLINOPYROXENE ( 3-4%)
Size(mm): 0.4 Morphology: SUBHEDRAL
SOME TYPES ARE PALE GREENISH*
Groundmass - OLIVINE ( 1-3%)
Size(mm): <0.4
PSEUDOMORPH ALTERED TO CHLORITE,COEXISTS WITH
MAGN;
PLAGIOCLASE ( 40%)
Size(mm): 0.3 Morphology: SUBHEDRAL
MICROLITES;
MAGNETITE ( 3-5%)
Size(mm): <0.2 Morphology: SKELETAL,DUST-LIKE
TWO TYPES: 1)LARGE SKELETAL (THIS TYPE IS CLOSELY
ASSOCIATED WITH THE ALTERED ZONE AND MAY BE
SECONDARY) AND 2)SMALL DUST-LIKE*
Alteration - CLAY MINERALS ( 10%)
Replacing: PLAG,OL PHENOS
PSEUDOMORPHS AFTER OL PHENOS;
CHLORITE ( 2-4%)
Location: SPOTS Replacing: OL,CPX
PSEUDOMORPHS AFTER GROUNDMASS OL*
Leg : 61 Top/Bottom Interval(mm): 1160/1180 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 901.00 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 906.67 Sect/Pc #: 4/PCE 7
ROCK = DOLERITE
ALTERED;
Texture: SUBOPHITIC,FINE GRAINED;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.4
APPROX COMP AN70;
CLINOPYROXENE ( 40%)
Size(mm): 0.15-0.3 Morphology: SUBHEDRAL
AUGITE,H (AS SU%)
Size(mm): BOPHITIC T Morphology: EXTURE;
MAGNETITE ( 5%)
Size(mm): <0.1
TI-MAGN;
GLASS ( 5%)
INTERSTITIAL GLASSY PATCHES REPLACED BY BROWN
CLAY;
APATITE ( TR%)
Alteration - CLAY MINERALS ( 10%)
Replacing: GLASS,CPX
BROWN CLAY REPLACING GLASS + CPX ETC*
Leg : 61 Top/Bottom Interval(mm): 230/ 250 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 901.00 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 908.74 Sect/Pc #: 6/PCE 2
ROCK = PLAG-CPX SPARSELY MICROPHYRIC BASALT
ALTERED;
Texture: SPARSELY MICROPHYRIC,HYALOPILITIC;
Where sampled: SILL INTERIOR
FINE GRAINED PORTION*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.2-0.3 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,REPLACED,APPROX COMP AN68;
CLINOPYROXENE ( 1%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,AUGITE*
Groundmass - MAGNETITE ( 5%)
Size(mm): <0.004 Morphology: DUST-LIKE
TI-MAGN;
GLASS ( 93%)
GLASSY GROUNDMASS CONSISTS OF SPARSE PLAG
MICROLITES + QUENCH CPX + GLASS--ALL ARE BEING
REPLACED BY CLAY + CALCITE;
PLAGIOCLASE
SPARSE MICROLITES;
CLINOPYROXENE
QUENCH*
Alteration - CALCITE
Replacing: PLAG,GLASS
PERCENTAGE VARIABLE;
CLAY MINERALS
Replacing: ALL.MINS,GLASS
PERCENTAGE QUESTIONABLE,BROWN CLAY REPLACES
EVERYTHING*
Leg : 61 Top/Bottom Interval(mm): 280/ 300 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 910.00 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 911.79 Sect/Pc #: 2/PCE 2C
ROCK = PLAG-CPX-OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,GLASSY-VARIOLITIC;
Where sampled: GLASSY FLOW MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.3-0.5
QUESTIONABLE PSEUDOMORPHS,MICROPHENOS;
PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.4 Morphology: EUHEDRAL
APPROX COMP AN70-72,MICROPHENOS;
CLINOPYROXENE ( 2%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL-SUBHEDRAL
AUGITE,MICROPHENOS*
Groundmass - PLAGIOCLASE
VARIABLE PERCENTAGE,SMALL MICROLITES AND
CRYSTALLITES;
CLINOPYROXENE
VARIABLE PERCENTAGE,QUENCH PHASE;
MAGNETITE ( 5%)
Size(mm): 0.008 Morphology: DUST-LIKE
TI-MAGN;
GLASS
GROUNDMASS IS GLASSY TO VARIOLITIC AND HEAVILY
REPLACED BY CLAY*
Alteration - CLAY MINERALS
Location: GROUNDMASS Replacing: GROUNDMASS,GLASS
PERCENTAGE VARIABLE;
ZEOLITE
Location: VEINS
PERCENTAGE VARIABLE*
Leg : 61 Top/Bottom Interval(mm): 950/ 970 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 919.00 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 922.96 Sect/Pc #: 3/PCE 2
ROCK = CPX-PLAG ALTERED BASALT
ALTERATION VEIN CONTACT WITH VARIOLITIC BASALT,
ROCK IS CPX-PLAG ALTERED VARIOLITIC TEXTURED
BASALT,VEIN IS DOMINANTLY (99.9%) A HIGH
BIREFRINGENCE FIBROUS MINERAL WHICH LOOKS LIKE
DISORDERED HYDRO-MICA BUT COULD BE A CLAY(?);
Texture: VARIOLITIC;
Where sampled: FLOW INTERIOR*
Alteration - ZEOLITE
PRESENT,FIBROUS AND LOW BIREFRINGENCE;
CLAY MINERALS ( 0.1%)
Location: PATCHES IN
Location: VEIN
GREEN CLAY PATCHES IN VEIN AND REPLACES THE ROCK;
HYDROMICA ( 99.9%)
Location: VEIN
HIGH BIREFRINGENCE,FIBROUS,LOOKS LIKE DISCOLORED
HYDROMICA BUT COULD BE A CLAY?*
Leg : 61 Top/Bottom Interval(mm): 170/ 200 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 919.00 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 923.69 Sect/Pc #: 4/PCE 1
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
ALTERED;
Texture: MODERATELY MICROPHYRIC,FINE GRAINED GRANULAR,
COARSE GRAINED EQUIGRANULAR-SUBOPHITIC
FINE GRAINED STUFF IS GRANULAR WITH AVERAGE GRAIN
SIZE= 0.002 MM,COARSE GRAINED STUFF IS
EQUIGRANULAR TO SUBOPHITIC WITH AVERAGE GRAIN SIZE
= 0.06 MM;
Where sampled: FLOW INTERIOR
FINE GRAINED APOPHYSES IN MEDIUM GRAINED BASALT*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,APPROX COMP AN65;
CLINOPYROXENE ( 3%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,AUGITE*
Groundmass - PLAGIOCLASE ( 42%)
Size(mm): <0.08
APPROX COMP AN65;
CLINOPYROXENE ( 43%)
Size(mm): <0.04
AUGITE;
MAGNETITE (10-15%)
Size(mm): <0.04
15% IN FINE GRAINED REGIONS AND 10% IN COARSE
GRAINED REGIONS,TI-MAGN*
Alteration - CLAY MINERALS ( 10%)
Replacing: ALL.MINS
BROWN CLAY ALTERATION OF EVERYTHING*
Leg : 61 Top/Bottom Interval(mm): 340/ 360 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 928.00 Rock Type: UNIDENTIFIED
Core: 71 Sample Midpoint(m) : 928.35 Sect/Pc #: 1/PCE 5
ROCK = BASALTIC BRECCIA
INTRUSIVE BRECCIA,CPX-PLAG PHYRIC VARIOLITIC-
VITROPHYRIC BASALT,SWIRLY MIXTURE OF HYALOPILITIC
AND VITROPHYRIC-SPHERULITIC BASALT INTRUDED AND
BRECCIATED BY (NOW) COARSER GRAINED LIQUID. THE
COARSE GRAINED BASALT IS SIMILAR IN TEXTURE TO
OTHER BASALT APOPHYSES FOUND ELSEWHERE.
ALTERATION VEINS TRANSECT PREVIOUSLY FORMED
BRECCIA (I.E. BRECCIATION WAS PROBABLY CAUSED BY
INTRUSION OF LATER LIQUID.);
Texture: VARIOLITIC,HYALOPILITIC,VITROPHYRIC-SPHERULITIC;
Where sampled: BRECCIATED ZONE OF PILLOW? MARGIN*
Leg : 61 Top/Bottom Interval(mm): 440/ 470 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 928.00 Rock Type: IGNEOUS
Core: 71 Sample Midpoint(m) : 928.46 Sect/Pc #: 1/PCE 6
ROCK = CPX-PLAG PHYRIC BASALT;
Texture: VARIOLITIC-EQUIGRANULAR
CONTINUOUS AND MONOTONIC VARIATION IN GRAIN SIZE
FROM VARIOLITIC TO EQUIGRANULAR TEXTURE;
Where sampled: PILLOW INTERIOR
COARSE GRAINED PORTION*
Leg : 61 Top/Bottom Interval(mm): 500/ 520 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 928.00 Rock Type: IGNEOUS
Core: 71 Sample Midpoint(m) : 928.51 Sect/Pc #: 1/PCE 6
ROCK = CPX-PLAG PHYRIC BASALT
CLAY FILLED ROUNDED VUGS ARE ABUNDANT;
Texture: EQUIGRANULAR;
Where sampled: COARSE GRAINED INTERIOR OF PILLOW*
Alteration - CLAY MINERALS
Location: VUGS
ABUNDANT CLAY FILLED VUGS*
Vesicles -
Filling: CLAY.MIN
Shape: ROUNDED
ABUNDANT VUGS*
Leg : 61 Top/Bottom Interval(mm): 530/ 550 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 931.00 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 933.04 Sect/Pc #: 2/PCE 4B
ROCK = ALTERED DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.6 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP AN60;
CLINOPYROXENE ( 45%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL-SUBHEDRAL
AUGITE;
MAGNETITE ( 5%)
Size(mm): 0.2-0.3 Morphology: SKELETAL
TI-MAGN*
Alteration - CLAY MINERALS ( 10%)
Replacing: ALL.MINS
BROWN CLAY REPLACING EVERYTHING*
Leg : 61 Top/Bottom Interval(mm): 1240/1260 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 937.00 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 939.75 Sect/Pc #: 2/PCE 8
ROCK = DOLERITE
ALTERED;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.3-0.6 Morphology: SUBHEDRAL
APPROX COMP AN70-72;
CLINOPYROXENE ( 40%)
Size(mm): 0.3-0.6 Morphology: SUBHEDRAL
AUGITE;
MAGNETITE ( 10%)
Size(mm): 0.2-0.5 Morphology: SKELETAL
TI-MAGN;
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR GRANOPHYRIC
INTERGROWTHS;
APATITE ( TR%)
Alteration - CLAY MINERALS ( 10%)
Replacing: ALL.MINS
BROWN CLAY REPLACING EVERYTHING*
Leg : 61 Top/Bottom Interval(mm): 780/ 800 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 953.00 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 958.29 Sect/Pc #: 4/PCE 5A
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: SILL INTERIOR*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 53.6%)
Morphology: LATHS
DIMENSIONS= 0.5X0.05 MM,APPROX COMP 36 DEGREES BY
A-NORMAL,NEED BETTER CURVES TO GET COMPOSITION;
CLINOPYROXENE ( 36.7%)
Morphology: EQUIDIMENSIONAL
DIMENSIONS= 0.2X0.2 MM;
OPAQUE MINERALS ( 6.6%)
INCLUDES MAGN + ILMENITE;
GLASS ( 0%)
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
PERCENTAGES OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 3.1%)
Leg : 61 Top/Bottom Interval(mm): 310/ 320 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 953.00 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 959.32 Sect/Pc #: 5/PCE 2
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - OLIVINE (<0.05%)
REPLACED BY CLAY;
PLAGIOCLASE ( 54%)
CLINOPYROXENE ( 36%)
2V 45-55;
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (700 POINTS)*
Alteration - CLAY MINERALS ( 5%)
Replacing: OL,GLASS
REPLACING GLASS IS QUESTIONABLE*
Leg : 61 Top/Bottom Interval(mm): 1220/1240 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 953.00 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 960.23 Sect/Pc #: 5/PCE 7
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 58%)
CLINOPYROXENE ( 31%)
OPAQUE MINERALS ( 6%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 5%)
Replacing: GLASS
REPLACING GLASS IS QUESTIONABLE*
Leg : 61 Top/Bottom Interval(mm): 590/ 610 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 958.00 Rock Type: IGNEOUS
Core: 76 Sample Midpoint(m) : 958.60 Sect/Pc #: 1/PCE 5
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
COMPLETELY ALTERED TO CLAY;
PLAGIOCLASE ( 0%)
CLINOPYROXENE ( 0%)
SPINEL ( 0%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 37.7%)
Size(mm): 0.1-6 Morphology: LATHS
CLINOPYROXENE ( 39.1%)
Size(mm): 0.05-0.3 Morphology: EQUIGRANULAR
2V 45-50,PARTIALLY ALTERED;
OPAQUE MINERALS ( 6.7%)
INCLUDES MAGN + ILMENITE;
GLASS ( 0%)
ALL ALTERED TO CLAY;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
PERCENTAGES OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CARBONATE ( TR%)
Location: VEIN
CLAY MINERALS ( 16.5%)
Location: INTERSTITIAL, Replacing: GLASS,OL
Location: VEINS
PYRITE
Location: VEINS
SOME PYRITE OCCURRING IN VEINS*
Leg : 61 Top/Bottom Interval(mm): 210/ 230 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 967.00 Rock Type: IGNEOUS
Core: 77 Sample Midpoint(m) : 967.22 Sect/Pc #: 1/PCE 2
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40.0%)
Morphology: LATHS
DIMENSIONS= 0.2X0.02 MM;
CLINOPYROXENE ( 47.1%)
Size(mm): 0.02-0.08 Morphology: EQUIDIMENSIONAL
OPAQUE MINERALS ( 5.3%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 7.5%)
Location: SCATTERED Replacing: CPX
MOSTLY REPLACING CPX*
Leg : 61 Top/Bottom Interval(mm): 750/ 770 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 967.00 Rock Type: IGNEOUS
Core: 77 Sample Midpoint(m) : 967.76 Sect/Pc #: 1/PCE 3E
ROCK = OL-PLAG-CPX MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,INTERGRANULAR-WEAKLY
VARIOLITIC (AUGITE + PLAG);
Where sampled: SILL INTERIOR
QUESTIONABLE*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): 0.1-0.2
PLAGIOCLASE ( <1%)
Size(mm): 0.05-0.1
CLINOPYROXENE ( <1%)
Size(mm): 0.05-0.1
Groundmass - OLIVINE ( 1.8%)
PLAGIOCLASE ( 41.7%)
CLINOPYROXENE ( 41.3%)
OPAQUE MINERALS ( 14.1%)
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED TO CLAY,PERCENTAGES OBTAINED BY POINT
COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 1.0%)
Replacing: OL
HIGH BIREFRINGENCE*
Leg : 61 Top/Bottom Interval(mm): 700/ 730 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 967.00 Rock Type: IGNEOUS
Core: 77 Sample Midpoint(m) : 969.22 Sect/Pc #: 2/PCE 2F
ROCK = DOLERITE;
Texture: SUBOPHITIC-VARIOLITIC;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- OLIVINE
COMPLETELY ALTERED TO BROWN CLAY*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 40.3%)
Size(mm): 0.05-0.3 Morphology: LATHS
SLIGHTLY ALTERED,ZONED;
CLINOPYROXENE ( 39.5%)
Size(mm): 0.04-0.15 Morphology: SUBHEDRAL GRAINS
MODERATELY ALTERED;
OPAQUE MINERALS ( 7.7%)
INCLUDES MAGN + ILMENITE;
GLASS ( 0%)
COMPLETELY ALTERED;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - CLAY MINERALS ( 12.5%)
Location: INTERSTITIAL Replacing: GLASS,OL
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 50/ 90 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 976.00 Rock Type: IGNEOUS
Core: 78 Sample Midpoint(m) : 976.07 Sect/Pc #: 1/PCE 2A
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERSERTAL;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
COMPLETELY ALTERED*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 34.5%)
Size(mm): 0.1-0.6 Morphology: LATHS
GENERALLY FRESH,SLIGHTLY ZONED;
CLINOPYROXENE ( 43.4%)
Size(mm): 0.05-0.4 Morphology: SUBHEDRAL GRAINS
GENERALLY FRESH;
OPAQUE MINERALS ( 5.5%)
INCLUDES MAGN + ILMENITE;
GLASS ( 0%)
COMPLETELY ALTERED;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - CARBONATE ( 0%)
CLAY MINERALS ( 16.6%)
Replacing: GLASS,OL
ZEOLITE ( 0%)
Leg : 61 Top/Bottom Interval(mm): 960/ 980 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 976.00 Rock Type: IGNEOUS
Core: 78 Sample Midpoint(m) : 976.97 Sect/Pc #: 1/PCE 4
ROCK = DOLERITE;
Texture: VARIOLITIC-SUBOPHITIC;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
ALTERED TO BROWN CLAY;
PLAGIOCLASE ( 0%)
CLINOPYROXENE ( 0%)
SPINEL ( 0%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 37.5%)
Size(mm): <0.01-0.4 Morphology: LATHS
ALSO FINE INTERGROWTHS (RADIATING SHEAVES) WITH
CPX;
CLINOPYROXENE ( 43.8%)
Size(mm): 0.01-0.3 Morphology: EQUIGRANULAR
ALSO FINE INTERGROWTHS (RADIATING SHEAVES) WITH
PLAG;
OPAQUE MINERALS ( 8.2%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT*
Alteration - CLAY MINERALS ( 10.4%)
Location: INTERSTITIAL Replacing: GLASS,OL
PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 870/ 890 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 976.00 Rock Type: IGNEOUS
Core: 78 Sample Midpoint(m) : 978.38 Sect/Pc #: 2/PCE 6
ROCK = DOLERITE;
Texture: INTERSERTAL;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 41.4%)
Size(mm): 0.35X0.05 Morphology: LATHS
DIMENSIONS= 0.35X0.05 MM;
CLINOPYROXENE ( 38.2%)
Size(mm): 0.04-0.10 Morphology: EQUIDIMENSIONAL
OPAQUE MINERALS ( 8.5%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
Alteration - CLAY MINERALS ( 11.9%)
Replacing: GLASS,OL,CPX
GOOD PSEUDOMORPHS AFTER OL*
POINT COUNT (1000 POINTS)*
Leg : 61 Top/Bottom Interval(mm): 1380/1400 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 985.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 986.39 Sect/Pc #: 1/PCE 1N
ROCK = BASALT;
Texture: INTERSERTAL*
Phenocrysts- OLIVINE
Size(mm): 0.15-0.2
MICROPHENOS;
CLINOPYROXENE
Size(mm): 0.1-0.15
MICROPHENOS*
Groundmass - OLIVINE ( 1.5%)
PSEUDOMORPHED BY CLAY;
PLAGIOCLASE ( 43.1%)
CLINOPYROXENE ( 38.8%)
OPAQUE MINERALS ( 4.6%)
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED TO AND COUNTED AS CLAY,PERCENTAGES
OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 12.0%)
Replacing: TACHYLITE,GLASS,OL
ALTERED TACHYLITE + GLASS + OL PROBABLY EQUALS
ORIGINAL GLASS,PSEUDOMORPHS AFTER OL COUNTED AS
OL*
Leg : 61 Top/Bottom Interval(mm): 1350/1370 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 985.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 987.86 Sect/Pc #: 2/PCE 4B
ROCK = OL-PLAG SPARSELY MICROPHYRIC BASALT;
Texture: SPARSELY MICROPHYRIC,INTERSERTAL,INTERGRANULAR*
Phenocrysts- OLIVINE ( >1%)
Size(mm): 0.2-0.5
REPLACED BY CLAY,MICROPHENOS;
PLAGIOCLASE ( <1%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL
ZONED,MICROPHENOS;
CLINOPYROXENE
Size(mm): 0.1-0.2
MICROPHENOS*
Groundmass - OLIVINE ( 1.7%)
REPLACED BY CLAY;
PLAGIOCLASE ( 41.8%)
CLINOPYROXENE ( 38.8%)
OPAQUE MINERALS ( 7.4%)
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED TO AND COUNTED AS CLAY (ORIGINALLY
TACHYLITE),PERCENTAGES OBTAINED BY POINT COUNT
(1000 POINTS)*
Alteration - CARBONATE ( 0.3%)
Replacing: FEL,GLASS
CLAY MINERALS ( 10.0%)
Replacing: GLASS,OL
CLAY PSEUDOMORPHS AFTER OL COUNTED AS OL;
ZEOLITE ( 0%)
Leg : 61 Top/Bottom Interval(mm): 420/ 440 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 985.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 991.43 Sect/Pc #: 5/PCE 1C
ROCK = OL SPARSELY MICROPHYRIC BASALT;
Texture: SPARSELY MICROPHYRIC,INTERGRANULAR;
Where sampled: SILL INTERIOR*
Phenocrysts- OLIVINE ( >1%)
Size(mm): 0.1-0.2
MICROPHENOS*
Groundmass - OLIVINE ( 1.4%)
REPLACED BY CLAY;
PLAGIOCLASE ( 46.4%)
CLINOPYROXENE ( 38.3%)
OPAQUE MINERALS ( 6.1%)
INCLUDES MAGN + ILMENITE;
GLASS
REPLACED BY AND COUNTED UNDER CLAY,PERCENTAGES
OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 7.8%)
Location: INTERSTITIAL Replacing: GLASS,OL
Leg : 61 Top/Bottom Interval(mm): 1350/1370 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 985.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 992.36 Sect/Pc #: 5/PCE 1J
ROCK = OL-PLAG-CPX MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY MICROPHYRIC,INTERGRANULAR WITH
VARIOLITIC CLOTS;
Where sampled: NEAR BASE OF UNIT--FINER GRAINED MARGIN*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): 0.1-0.4
ALTERED TO CLAY,MICROPHENOS;
PLAGIOCLASE ( <1%)
Size(mm): 0.1-0.3
MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): 0.05-0.15
MICROPHENOS*
Groundmass - OLIVINE ( 2.2%)
ALTERED TO CLAY;
PLAGIOCLASE ( 40.8%)
CLINOPYROXENE ( 43.5%)
OPAQUE MINERALS ( 8.9%)
INCLUDES MAGN + ILMENITE;
GLASS ( 4.6%)
ALTERED TO CLAY,PERCENTAGES OBTAINED BY POINT
COUNT (1000 POINTS)*
Alteration - CLAY MINERALS
Location: INTERSTITIAL Replacing: GLASS,OL
PSEUDOMORPHS*
Leg : 61 Top/Bottom Interval(mm): 920/ 940 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 998.00 Rock Type: IGNEOUS
Core: 81 Sample Midpoint(m) : 998.93 Sect/Pc #: 1/PCE 5C
ROCK = DOLERITE;
Texture: INTERGRANULAR;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - OLIVINE ( 1.2%)
Size(mm): 0.2-0.3
CLAY POCKETS WITH EUHEDRAL OUTLINES;
PLAGIOCLASE ( 47.6%)
Size(mm): 0.15X0.04
DIMENSIONS= 0.15X0.04 MM;
CLINOPYROXENE ( 42.7%)
Size(mm): 0.06
OPAQUE MINERALS ( 5.9%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT*
Alteration - CLAY MINERALS ( 2.6%)
Replacing: OL
CLAY POCKETS WITH EUHEDRAL OUTLINES*
Leg : 61 Top/Bottom Interval(mm): 580/ 600 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 998.00 Rock Type: IGNEOUS
Core: 81 Sample Midpoint(m) : 1001.59 Sect/Pc #: 3/PCE 2A
ROCK = BASALT;
Texture: INTERGRANULAR*
Phenocrysts- OLIVINE
Size(mm): 0.2-0.45
MICROPHENOS,ALTERED TO CLAY;
PLAGIOCLASE
Size(mm): 0.2-0.7
PHENOS + MICROPHENOS;
CLINOPYROXENE
Size(mm): 0.1-0.3
MICROPHENOS*
Groundmass - OLIVINE ( 1.3%)
ALTERED TO CLAY;
PLAGIOCLASE ( 43.2%)
CLINOPYROXENE ( 35.6%)
OPAQUE MINERALS ( 13.3%)
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED TO AND COUNTED AS CLAY,PERCENTAGES
OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 6.6%)
Location: INTERSTITIAL Replacing: GLASS,OL
Leg : 61 Top/Bottom Interval(mm): 1380/1400 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 1005.50 Rock Type: IGNEOUS
Core: 84 Sample Midpoint(m) : 1009.89 Sect/Pc #: 3/PCE 1F
ROCK = BASALT;
Texture: INTERGRANULAR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.1-0.2
ALTERED TO CLAY,MICROPHENOS;
PLAGIOCLASE
Size(mm): 0.3-0.4
MICROPHENOS;
CLINOPYROXENE
Size(mm): 0.3-0.4
MICROPHENOS*
Groundmass - OLIVINE ( 1.5%)
ALTERED TO CLAY;
PLAGIOCLASE ( 50.7%)
Size(mm): 0.05-0.1
CLINOPYROXENE ( 35.1%)
Size(mm): 0.05-1.5
OPAQUE MINERALS ( 7.2%)
Size(mm): 0.03-0.05
INCLUDES MAGN + ILMENITE;
GLASS ( 0%)
PERCENTAGES OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 5.5%)
Location: INTERSTITIAL Replacing: GLASS,OL
MOSTLY REPLACING INTERSTITIAL GLASS*
Leg : 61 Top/Bottom Interval(mm): 490/ 510 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 1005.50 Rock Type: IGNEOUS
Core: 84 Sample Midpoint(m) : 1010.50 Sect/Pc #: 4/PCE 1D
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 38.5%)
Size(mm): 0.15X0.04 Morphology: LATHS
DIMENSIONS= 0.15X0.04 MM;
CLINOPYROXENE ( 21.5%)
Size(mm): 0.10 Morphology: EQUIDIMENSIONAL
BADLY ALTERED;
OPAQUE MINERALS ( 4.3%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 35.7%)
Leg : 61 Top/Bottom Interval(mm): 750/ 770 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 1005.50 Rock Type: IGNEOUS
Core: 84 Sample Midpoint(m) : 1012.26 Sect/Pc #: 5/PCE 2
ROCK = DOLERITE;
Texture: SUBOPHITIC;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- OLIVINE
PATCHES OF BROWN CLAY MAY BE PSEUDOMORPHS OF OL*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 42.6%)
Size(mm): 0.05-0.6
UNALTERED,ZONED;
CLINOPYROXENE ( 43.1%)
Size(mm): 0.05-0.4
GENERALLY FRESH;
OPAQUE MINERALS ( 6.1%)
Size(mm): 0.05-0.5
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED TO BROWN CLAY;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - CARBONATE ( 0%)
CLAY MINERALS ( 8.3%)
Location: INTERSTITIAL, Replacing: GLASS,OL
Location: PATCHES
BROWN,MAY BE PSEUDOMORPHS AFTER OL?,CONTAINS
NUMEROUS OPAQUES;
ZEOLITE ( 0%)
Leg : 61 Top/Bottom Interval(mm): 830/ 850 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 1032.50 Rock Type: IGNEOUS
Core: 88 Sample Midpoint(m) : 1034.84 Sect/Pc #: 2/PCE 1E
ROCK = OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC,INTERGRANULAR*
Phenocrysts- OLIVINE ( 1.6%)
ALTERED TO CLAY*
Groundmass - PLAGIOCLASE ( 50.0%)
Size(mm): 0.2-0.3
CLINOPYROXENE ( 36.8%)
Size(mm): 0.1-0.3
OPAQUE MINERALS ( 4.2%)
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED TO AND COUNTED AS CLAY,ONE GLASSY ZONE
ACROSS THIN SECTION,PERCENTAGES OBTAINED BY POINT
COUNT (500 POINTS)*
Alteration - CLAY MINERALS ( 7.4%)
Replacing: OL,GLASS
Leg : 61 Top/Bottom Interval(mm): 1190/1210 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 1032.50 Rock Type: IGNEOUS
Core: 88 Sample Midpoint(m) : 1035.20 Sect/Pc #: 2/PCE 1F
ROCK = DOLERITE;
Texture: SUBOPHITIC;
FLOW OR SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 0%)
CLINOPYROXENE ( 0%)
SPINEL ( 0%)
Groundmass - PLAGIOCLASE ( 45.9%)
Size(mm): 0.05-0.5 Morphology: LATHS
ZONED;
CLINOPYROXENE ( 36.0%)
Size(mm): 0.03-0.3 Morphology: EQUIGRANULAR
OPAQUE MINERALS ( 4.5%)
INCLUDES MAGN + ILMENITE;
GLASS ( 1.8%)
RELATIVELY FRESH--ALTERED GLASS COUNTED AS CLAY;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( TR%)
PERCENTAGES OBTAINED BY POINT COUNT (1000 POINTS)*
Alteration - CLAY MINERALS ( 11.7%)
Location: INTERSTITIAL Replacing: GLASS
Leg : 61 Top/Bottom Interval(mm): 1250/1270 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 1032.50 Rock Type: IGNEOUS
Core: 88 Sample Midpoint(m) : 1035.26 Sect/Pc #: 2/PCE 1F
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 54.0%)
Size(mm): 0.18X0.14 Morphology: LATHS
DIMENSIONS= 0.18X0.14 MM;
CLINOPYROXENE ( 32.6%)
Size(mm): 0.08 Morphology: EQUIDIMENSIONAL
OPAQUE MINERALS ( 2.6%)
INCLUDES MAGN + ILMENITE;
KFELDSPAR
QUESTIONABLE,SOME INTERSTITIAL K-SPAR?
INTERGROWTHS,PERCENTAGES OBTAINED BY POINT COUNT
(500 POINTS)*
Alteration - CLAY MINERALS ( 10.8%)
Leg : 61 Top/Bottom Interval(mm): 380/ 400 Describer: Vallier, T.
Hole: 462A Top of Core Depth(m) : 1036.50 Rock Type: IGNEOUS
Core: 89 Sample Midpoint(m) : 1038.39 Sect/Pc #: 2/PCE 2B
ROCK = APHYRIC BASALT
VEINED;
Texture: APHYRIC,INTERSERTAL
SOME VARIOLITIC TEXTURE IN PLACES,VEINED;
Where sampled: NEXT TO GLASSY MARGIN*
Groundmass - OLIVINE ( 0.2%)
RARE,ALTERED TO CLAY;
PLAGIOCLASE ( 30.0%)
Size(mm): 0.05-0.15
CLINOPYROXENE ( 31.2%)
Size(mm): 0.05-0.10
OPAQUE MINERALS ( 2.4%)
INCLUDES MAGN + ILMENITE;
GLASS ( 0%)
ALTERED TO AND COUNTED UNDER CLAY.MIN (ALTERED TO
SMEC),PERCENTAGES OBTAINED BY POINT COUNT (500
POINTS)--COUNT IS POOR BECAUSE OF ALTERED
VARIOLITES OF CPX + GLASS*
Alteration - CARBONATE ( 1.6%)
Location: VEIN
REPLACING A VEIN MINERAL?;
CLAY MINERALS ( 34.6%)
Replacing: GLASS,OL
PREDOMINANTLY REPLACING GLASS,GLASS IS NOW SMEC*
Leg : 61 Top/Bottom Interval(mm): 720/ 740 Describer: Windom, K.
Hole: 462A Top of Core Depth(m) : 1036.50 Rock Type: IGNEOUS
Core: 89 Sample Midpoint(m) : 1038.73 Sect/Pc #: 2/PCE 5
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC,VARIOLITIC
A FEW PHENOS AND INTERGRANULAR AREAS;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.4-0.6
CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.3
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 19.8%)
Size(mm): 0.1-0.2 Morphology: LATHS
CLINOPYROXENE ( 16.6%)
Size(mm): 0.01-0.1 Morphology: EQUIGRANULAR
PLAG + PYX OCCUR IN VERY FINE GRAINED VARIOLITIC
PATCHES WHICH ARE HIGHLY ALTERED IN ADDITION TO
THE ESSENTIALLY FRESH GRAINS REPRESENTED HERE;
OPAQUE MINERALS ( 12.4%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (500 POINTS)*
Alteration - CLAY MINERALS ( 49.2%)
Location: VARIOLES, Replacing: GLASS,PYX,PLAG,OL
Location: INTERSTITIAL
VERY FINE GRAINED,MOSTLY REPLACING VARIOLES OF PYX
+ PLAG + GLASS*
Leg : 61 Top/Bottom Interval(mm): 240/ 260 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 1041.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 1041.75 Sect/Pc #: 1/PCE 2A
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 48.6%)
Size(mm): 0.3X0.04 Morphology: LATHS
DIMENSIONS= 0.3X0.04 MM;
CLINOPYROXENE ( 33.8%)
Size(mm): 0.18 Morphology: EQUIDIMENSIONAL
OPAQUE MINERALS ( 6.0%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (500 POINTS)*
Alteration - CLAY MINERALS ( 11.6%)
Leg : 61 Top/Bottom Interval(mm): 600/ 630 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 1041.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 1045.12 Sect/Pc #: 3/PCE 1F
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
A FEW MICROPHENOS*
Groundmass - PLAGIOCLASE ( 52.4%)
Morphology: LATHS
DIMENSIONS= 0.5X0.05 MM;
CLINOPYROXENE ( 34.0%)
Size(mm): 0.16
OPAQUE MINERALS ( 7.2%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (500 POINTS)*
Alteration - CLAY MINERALS ( 6.4%)
PERHAPS SOME PSEUDOMORPHS AFTER OL*
Leg : 61 Top/Bottom Interval(mm): 400/ 420 Describer: Seifert, K.
Hole: 462A Top of Core Depth(m) : 1041.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 1047.91 Sect/Pc #: 5/PCE 2
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 52.8%)
Morphology: LATHS
DIMENSIONS= 0.18X0.02;
CLINOPYROXENE ( 34.6%)
Size(mm): 0.08 Morphology: EQUIDIMENSIONAL
OPAQUE MINERALS ( 4.8%)
INCLUDES MAGN + ILMENITE,PERCENTAGES OBTAINED BY
POINT COUNT (500 POINTS)*
Alteration - CLAY MINERALS ( 7.8%)
Leg : 61 Top/Bottom Interval(mm): 230/ 260 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 624.00 Rock Type: IGNEOUS
Core: B 1 Sample Midpoint(m) : 624.24 Sect/Pc #: 1/PCE 2
ROCK = DOLERITE
ALTERED,(BIT CORE);
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR
BUT OUT OF ORDER*
Phenocrysts- PLAGIOCLASE ( TR%)
CLINOPYROXENE ( TR%)
Size(mm): <0.5
AUGITE*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.3
APPROX COMP AN55 ZONED TO AN25;
CLINOPYROXENE ( 38%)
Size(mm): <0.25
AUGITE;
MAGNETITE ( 5%)
Size(mm): 0.1-0.3 Morphology: SUBHEDRAL
TI-MAGN;
GLASS ( 7%)
TOTALLY REPLACED INTERSTITIAL PATCHES;
AMPHIBOLE ( 5%)
MINUTE NEEDLES REPLACING CPX*
Alteration - CLAY MINERALS ( 15%)
Replacing: CPX,PLAG
AMPHIBOLE ( 5%)
Replacing: CPX
MINUTE NEEDLES REPLACING CPX*
Leg : 61 Top/Bottom Interval(mm): 400/ 430 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 624.00 Rock Type: IGNEOUS
Core: B 1 Sample Midpoint(m) : 624.42 Sect/Pc #: 1/PCE 3
ROCK = DOLERITE
ALTERED;
Texture: MICRODOLERITIC;
Where sampled: SILL INTERIOR
BUT OUT OF POSITION*
Phenocrysts- CLINOPYROXENE ( TR%)
Size(mm): TO 0.5
AUGITE*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1-0.3
APPROX COMP AN60 ZONED TO AN30 (AN70 IS RARE);
CLINOPYROXENE ( 35%)
Size(mm): <0.2
AUGITE;
MAGNETITE ( 10%)
Size(mm): <0.20
TI-MAGN;
GLASS ( 10%)
TOTALLY REPLACED GLASS PATCHES;
QUARTZ ( TR%)
ALKALI FELDSPAR ( TR%)
AMPHIBOLE
PERCENTAGE UNCERTAIN;
APATITE ( TR%)
Alteration - COMBINATION ( 25%)
BROWN CLAY + AMPH (TOTAL ALTERATION PRODUCTS);
CLAY MINERALS
AMPHIBOLE
Leg : 61 Top/Bottom Interval(mm): 100/ 120 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 690.00 Rock Type: IGNEOUS
Core: B 2 Sample Midpoint(m) : 690.11 Sect/Pc #: 1/PCE 2
ROCK = CPX-PLAG MODERATELY MICROPHYRIC BASALT
FRESH;
Texture: MODERATELY MICROPHYRIC,INTERSERTAL-SPHERULITIC;
Where sampled: MARGINAL ZONE OF SILL*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.1-0.3 Morphology: SUBHEDRAL
APPROX COMP AN58,MICROPHENOS;
CLINOPYROXENE ( 4%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL
AUGITE*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <0.4 Morphology: SUBHEDRAL-SKELETAL
APPROX COMP AN60;
CLINOPYROXENE ( 40%)
Size(mm): <0.2
MUCH OF IT QUENCH TEXTURED;
MAGNETITE ( 10%)
Size(mm): <0.02
GLASS ( 3-4%)
ONLY A FEW INTERSERTAL PATCHES*
Alteration - CLAY MINERALS ( 10%)
Replacing: CPX,GLASS
GREENISH BROWN*
Leg : 61 Top/Bottom Interval(mm): 900/ 920 Describer: Batiza, R.
Hole: 462A Top of Core Depth(m) : 690.00 Rock Type: IGNEOUS
Core: B 2 Sample Midpoint(m) : 690.91 Sect/Pc #: 1/PCE 9
ROCK = DOLERITE
RELATIVELY FRESH;
Texture: SUBOPHITIC;
Where sampled: INTERIOR OF SILL*
Groundmass - PLAGIOCLASE ( 37%)
Size(mm): 0.3-0.7
APPROX COMP AN58-60;
CLINOPYROXENE ( 46%)
Size(mm): 0.2-0.8 Morphology: SUBHEDRAL
AUGITE;
MAGNETITE ( 5%)
Size(mm): <0.2
TI-MAGN;
GLASS ( 1-2%)
REPLACED BY CLAY + CHLORITE + AMPH,ALSO VARIOLITIC
PATCHES;
COMBINATION ( TR%)
INCLUDES GRANOPHYRIC PATCHES OF QUARTZ + ALK.SPAR;
AMPHIBOLE ( TR-1%)
Alteration - COMBINATION ( 10%)
Replacing: CPX
INCLUDES CLAY+AMPH+CHLORITE,CLAY IS BROWNISH-GREEN;
CHLORITE ( TR%)
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