Leg : 64 Top/Bottom Interval(mm): 1490/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 515.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 519.49 Sect/Pc #: 3/PCE 1B
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCHED
FINE-GRAINED VARIOLITIC/SUBSPHERULITIC GROUNDMASS
COMPRISING PLAG MICROLITES + PYX + DISSEMINATED
OP.MINS + MESOSTASIS;
Where sampled: NEXT TO GLASSY MARGIN
SILL EDGE*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 15%)
Size(mm): TO 2 Morphology: SUBHEDRAL,TABULAR,LATH-SHAPED
SPINEL ( 2%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
CR-SPINEL,MICROPHENOS*
Groundmass - PLAGIOCLASE
MICROLITES;
PYROXENE
OPAQUE MINERALS
DISSEMINATED;
MESOSTASIS
Alteration - OTHER ( 20%)
Location: PSEUDOMORPHS Replacing: OL
MINERAL NOT IDENTIFIED,REPLACING OL IS
QUESTIONABLE*
Leg : 64 Top/Bottom Interval(mm): 650/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 515.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 520.15 Sect/Pc #: 4/PCE 8
ROCK = DOLERITE;
Texture: SUBOPHITIC,SERIATE;
Where sampled: OTHER
ABOUT 70 CM BELOW THE SILL/SEDIMENT CONTACT*
Phenocrysts- OLIVINE ( 5%)
Size(mm): TO 2 Morphology: SUBHEDRAL
FRACTURED,ALTERED,GROUNDMASS TO 2 MM*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.1-0.6 Morphology: ANHEDRAL-SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 40%)
Size(mm): 0.4-1.0 Morphology: SUBHEDRAL LATHS
OCCASIONALLY OPHITICALLY ENCLOSED IN PYX,UNZONED,
APPROX COMP AN50;
CLINOPYROXENE ( 35%)
Size(mm): 0.4-1.0 Morphology: ANHEDRAL-EUHEDRAL
APPROX COMP AUGITE?,PALE BROWN,ENCLOSING PLAG IN
MAGNETITE ( 5%)
Size(mm): 0.1 Morphology: SUBHEDRAL
GENERALLY INTERSTITIAL;
ALKALI FELDSPAR ( 5%)
Size(mm): 0.1
PERCENTAGE QUESTIONABLE,INTERSTITIAL FELDSPAR,
PROBABLY PLAG*
Alteration - BOWLINGITE ( 2-3%)
Replacing: OL
SURROUNDING OL*
Vesicles -
Percent: 0
NONE SEEN*
Leg : 64 Top/Bottom Interval(mm): 700/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 524.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 525.20 Sect/Pc #: 1/PCE 2B
ROCK = OL PHYRIC DOLERITE;
Texture: PORPHYRITIC,SUBDOLERITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 25%)
Size(mm): 0.5-2 Morphology: SUBHEDRAL-ANHEDRAL
Groundmass - OLIVINE ( 10%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL,ROUNDED
MAY BE MICROPHENOS;
PLAGIOCLASE ( 40%)
Size(mm): TO 1.0 Morphology: SUBHEDRAL LATHS
APPROX COMP AN52,UNZONED;
CLINOPYROXENE ( 25%)
Size(mm): 0.2-0.8 Morphology: ANHEDRAL
APPROX COMP AUGITE,INTERSTITIAL,BROWN,MAY BE
TI02-RICH;
MAGNETITE ( 2%)
Morphology: SUBHEDRAL
Alteration - BOWLINGITE ( <1%)
Replacing: OL
AROUND OL XTLS*
Vesicles -
Percent: 0
NONE SEEN*
Leg : 64 Top/Bottom Interval(mm): 380/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 524.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 526.38 Sect/Pc #: 2/PCE 3E
ROCK = OL PHYRIC DOLERITE;
Texture: PORPHYRITIC,DOLERITIC-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR,ADJACENT TO ALTERED VEINS*
Phenocrysts- OLIVINE ( 30%)
Size(mm): 0.5-3 Morphology: SUBHEDRAL-EUHEDRAL
COMPLETELY ALTERED TO GREEN CLAY.MIN (BOWLINGITE)*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.3-0.6
COMPLETELY PSEUDOMORPHED BY BOWLINGITE;
PLAGIOCLASE ( 30%)
Size(mm): 0.3-0.8 Morphology: SUBHEDRAL LATHS
APPROX COMP AN50;
CLINOPYROXENE ( 30%)
Size(mm): 0.3-0.8 Morphology: ANHEDRAL
APPROX COMP AUGITE,INTERSTITIAL TO PLAG;
MAGNETITE ( 5%)
Size(mm): <0.3 Morphology: SUBHEDRAL
Alteration - COMBINATION ( 40%)
Location: PSEUDOMORPHS Replacing: OL
INCLUDES BWLGITE + TALC,ALL OL REPLACED BY GREEN
CLAY.MINS*
Vesicles -
Percent: 0
NONE SEEN*
Leg : 64 Top/Bottom Interval(mm): 1290/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 534.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 541.29 Sect/Pc #: 5/PCE 1A
ROCK = OL-PLAG VITROPHYRIC BASALT;
Texture: HYALOPILITIC,VARIOLITIC,GLASSY,CHILLED;
Where sampled: GLASSY MARGIN + NEXT TO GLASSY MARGIN + SEDIMENT
UPPER CONTACT OF SECOND DOLERITE SILL WITH BASALT
CHILL ZONE*
Phenocrysts- OLIVINE ( 15%)
Size(mm): 0.5-1.2 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 5%)
Size(mm): 0.1-0.2 Morphology: LATHS
MICROPHENOS + CHILL OVERGROWTHS;
SPINEL ( 2%)
Size(mm): 0.1 Morphology: SUBHEDRAL
CHROMITE MICROPHENOS*
Groundmass - MICROCRYST GROUNDMASS ( 70%)
Size(mm): <0.2
INCLUDES OL + PLAG + CPX,MICROLITES,VERY FINE
GRAINED,INDISTINGUISHABLE*
Alteration - CARBONATE ( 10%)
Location: VEINS,GLASS
IN NARROW VEINS (0.5 MM) CROSS-CUTTING GLASS +
SEDIMENT,IN GLASS;
CLAY MINERALS ( 2%)
Location: GLASS Replacing: GLASS
Leg : 64 Top/Bottom Interval(mm): 380/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 534.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 541.88 Sect/Pc #: 6/PCE 5
ROCK = OL PHYRIC DOLERITE
OR COARSE BASALT;
Texture: PORPHYRITIC,DOLERITIC;
Where sampled: OTHER
SILL INTERIOR,ADJACENT TO 2 MM WIDE VEIN*
Phenocrysts- OLIVINE ( 15%)
Size(mm): 0.3-1 Morphology: SUBHEDRAL-EUHEDRAL
COMPLETELY REPLACED BY BOWLINGITE*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.10
COMPLETELY REPLACED BY BOWLINGITE;
PLAGIOCLASE ( 45%)
Size(mm): 0.10-0.5 Morphology: SUBHEDRAL
APPROX COMP AN50;
CLINOPYROXENE ( 30%)
Size(mm): 0.1-0.5 Morphology: ANHEDRAL
APPROX COMP AUGITE (TITANIFEROUS?);
MAGNETITE ( 2%)
Size(mm): 0.01-0.1 Morphology: SUBHEDRAL-EUHEDRAL
Alteration - CARBONATE
Location: VEIN
CARB COMPOSES 5% OF THE 2 MM WIDE VEIN;
ZEOLITE
Location: VEIN
ZEOLITES COMPOSE 95% OF THE 2 MM WIDE VEIN,
TRIGONAL? CHABAZITE?;
BOWLINGITE ( 20%)
Replacing: OL
OL COMPLETELY REPLACED*
Vesicles -
Percent: 0
NONE SEEN*
Leg : 64 Top/Bottom Interval(mm): 680/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 543.50 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 544.18 Sect/Pc #: 1/PCE 2A
ROCK = OL-PLAG PHYRIC DOLERITE;
Texture: PORPHYRITIC,SUBOPHITIC,FINE GRAINED;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 25%)
Size(mm): 0.5-2 Morphology: SUBHEDRAL-ANHEDRAL
MOSTLY ALTERED TO BOWLINGITE;
PLAGIOCLASE ( 2%)
Size(mm): 0.5 Morphology: SUBHEDRAL,BROAD,TABULAR
ISOLATED PHENOS;
SPINEL ( 2%)
Size(mm): 0.05-0.1 Morphology: SUBHEDRAL
RED ?CHROMITE*
Groundmass - OLIVINE ( 10%)
Size(mm): <0.5 Morphology: ANHEDRAL
ALTERED TO BOWLINGITE;
PLAGIOCLASE ( 40%)
Size(mm): 0.2-1.0 Morphology: SUBHEDRAL LATHS
APPROX COMP AN56;
CLINOPYROXENE ( 20%)
Size(mm): 0.2-1.0 Morphology: ANHEDRAL
APPROX COMP AUGITE,INTERSTITIAL,PALE BROWN;
MAGNETITE ( 4%)
Size(mm): 0.05-0.1
Alteration - BOWLINGITE ( 15%)
Location: AROUND OL Replacing: OL
COMPLETELY REPLACING OL IN PLACES*
Leg : 64 Top/Bottom Interval(mm): 660/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 543.50 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 547.16 Sect/Pc #: 3/PCE 5D
ROCK = DOLERITE;
Texture: APHYRIC,SUBOPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.1-0.2 Morphology: ANHEDRAL
50% REPLACED BY BOWLINGITE REQUOTED UNDER ALTER.;
PLAGIOCLASE ( 40%)
Size(mm): 0.5-1.0 Morphology: SUBHEDRAL
UNZONED;
CLINOPYROXENE ( 40%)
Size(mm): 0.1-0.2 Morphology: ANHEDRAL
APPROX COMP AUGITE,PALE BROWN,SUBOPHITICALLY
ENCLOSING PLAG;
MAGNETITE ( 3%)
Size(mm): 0.1-0.2
MAY BE GROUNDMASS PHASE*
Alteration - CLAY MINERALS ( 2%)
Location: GROUNDMASS
FOUND IN GROUNDMASS AROUND VESICLES;
BOWLINGITE ( 5%)
Location: SURROUNDING Replacing: OL
Location: OL
Vesicles -
Size(mm): 1.5-2
Percent: 2
Location: RANDOM
Filling: SMEC
Shape: SPHERICAL
FILLING CONSISTS OF THIN LININGS OF GREEN SMEC*
Leg : 64 Top/Bottom Interval(mm): 1180/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 553.00 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 554.18 Sect/Pc #: 1/PCE 4J
ROCK = PLAG-OL MODERATELY PHYRIC DOLERITE;
Texture: MODERATELY PORPHYRITIC,FINE-GRAINED
ALMOST BASALTIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.5 Morphology: SUBHEDRAL
MICROPHENOS;
PLAGIOCLASE ( 5%)
Size(mm): <2 Morphology: ELONGATE,TABULAR,SUBHEDRAL
APPROX COMP AN55-60*
Groundmass - OLIVINE ( 20%)
Size(mm): 0.1-0.5 Morphology: SUBHEDRAL
PROBABLY GROWING IN SITU,INTERSTITIAL;
PLAGIOCLASE ( 40%)
Size(mm): 0.2-1.0 Morphology: LATHS,RADIAL CLUSTERS
RADIAL CLUSTERS (VARIOLES) FREQUENT;
CLINOPYROXENE
PROBABLY IN MESOSTASIS;
MAGNETITE ( 5%)
ILMENITE ( 5%)
OTHER ( 20%)
AMORPHOUS GROUNDMASS,MAINLY ALTERED TO YELLOW
CLAY.MIN*
Alteration - CLAY MINERALS ( 20%)
Replacing: MESOSTASIS
AMORPHOUS MESOSTASIS MAINLY ALTERED TO YELLOW
CLAY.MIN*
Vesicles -
Size(mm): 0.4-0.6
Percent: 2
Location: RANDOM
Filling: CALCITE
Shape: SPHERICAL
VESICLES HAVE A MESOSTASIS RIM WITH A CALCITE
FILLING*
Leg : 64 Top/Bottom Interval(mm): 200/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 553.00 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 554.70 Sect/Pc #: 2/PCE 1B
ROCK = APHYRIC BASALT
OR DOLERITE;
Texture: APHYRIC,SUBDOLERITIC;
Where sampled: OTHER
ADJACENT TO VEIN*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): TO 1.5 Morphology: LATH-SHAPED
CLINOPYROXENE ( 20%)
Size(mm): TO 1 Morphology: ELONGATE,ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Morphology: GRANULAR
ILMENITE ( 2%)
Size(mm): TO 0.1 Morphology: ELONGATE,SKELETAL,DENDRITIC
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS, Replacing: MESOSTASIS,OL
Location: VESICLES
?REPLACING MESOSTASIS OR OL;
ZEOLITE ( 20%)
Location: VEIN
Vesicles -
Size(mm): TO 3
Percent: 5
Location: RANDOM
Filling: CLAY.MIN
Shape: SPHERICAL
CLAY.MIN ARE GREEN*
Leg : 64 Top/Bottom Interval(mm): 70/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 562.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 562.57 Sect/Pc #: 1/PCE 1A
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,BASALTIC,
HYALOCRYSTALLINE;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 0.5-1.0 Morphology: LATH-LIKE,TABULAR
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.05-0.1
MICROLITES;
MAGNETITE ( 5%)
Size(mm): 0.01-0.02 Morphology: CUBES
Alteration - CLAY MINERALS ( 30%)
Location: THROUGHOUT Replacing: MESOSTASIS
ZEOLITE ( 5%)
Location: VESICLES
Vesicles -
Size(mm): 0.5-4.0
Percent: 20
Location: CHILL ZONE
Filling: MESOSTASIS,
Shape: REGULAR,
Filling: PALAG,ZEOLITES
Shape: IRREGULAR
REGULAR SHAPED VESICLES ARE FILLED WITH MESOSTASIS
AND IRREGULAR SHAPED ONES ARE FILLED WITH PALAG +
ZEOLITES*
Leg : 64 Top/Bottom Interval(mm): 1050/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 562.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 563.55 Sect/Pc #: 1/PCE 12A
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VARIOLITIC,INTERSERTAL*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 50%)
Size(mm): <0.5 Morphology: SKELETAL
VARIOLITIC AGGREGATES;
CLINOPYROXENE ( 20%)
Size(mm): <0.1 Morphology: QUENCH,PLUMOSE
GROWING ON PLAG;
MAGNETITE ( 3%)
DISSEMINATED;
MESOSTASIS ( 15%)
Alteration - CLAY MINERALS ( 10%)
Location: MESOSTASIS, Replacing: MESOSTASIS
Location: VESICLES
GREENISH IN COLOR*
Vesicles -
Size(mm): 0.3-0.8
Percent: 15
Location: RANDOM
Filling: MESOSTASIS,
Shape: SPHERICAL
Filling: CLAY.MIN
Leg : 64 Top/Bottom Interval(mm): 560/ 0 Describer: Fornari, D.
Hole: 474A Top of Core Depth(m) : 562.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 564.56 Sect/Pc #: 2/PCE 8A
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL-HYALOPILITIC;
Where sampled: PILLOW INTERIOR
20 CM BELOW GLASSY SELVAGE OF PILLOW*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 0.5 Morphology: EUHEDRAL-SUBHEDRAL
CORRODED;
PLAGIOCLASE ( 20%)
Size(mm): 0.5-2 Morphology: LATHS
APPROX COMP AN50-60,MICROLITES;
CLINOPYROXENE ( 5%)
Size(mm): 0.25-1 Morphology: SUBHEDRAL
APPROX COMP AUGITE,CORRODED,PROBABLY ALTERED OL*
Groundmass - PLAGIOCLASE ( 15%)
CLINOPYROXENE ( 5%)
ILMENITE ( 5%)
GLASS ( 50%)
Alteration - CLAY MINERALS
Location: VESICLES
ZEOLITE
Location: VESICLES
Vesicles -
Size(mm): 0.1-1
Percent: 5
Location: DISPERSED
Filling: CLAY.MIN,
Shape: ROUND-
Filling: ZEOLITES
Shape: SUBROUND
PERIPHERY IS IRREGULAR,VESICLES ARE COMPLETELY
FILLED*
Leg : 64 Top/Bottom Interval(mm): 380/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 562.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 565.88 Sect/Pc #: 3/PCE 5B
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,VARIOLITIC GROUNDMASS;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 5%)
Size(mm): 1-4 Morphology: TABULAR,SUBHEDRAL
LARGE AGGREGATES,ZONED,RESORBED EDGES;
PLAGIOCLASE ( 30%)
Size(mm): 0.4-2.5 Morphology: ELONGATE
MICROPHENOS;
CLINOPYROXENE ( 0%)
SPINEL ( 2-4%)
Size(mm): 0.01-0.05 Morphology: CUBIC
IN GROUNDMASS AND PLAG PHENOS*
Groundmass - OLIVINE ( 5%)
Size(mm): <0.2
PERCENTAGE QUESTIONABLE,INTERSTITIAL,QUENCHED;
PLAGIOCLASE ( 20%)
Size(mm): 0.2-0.5 Morphology: SKELETAL
MICROLITIC;
CLINOPYROXENE ( 15%)
Size(mm): <0.4 Morphology: SKELETAL,DENDRITIC
QUENCH;
MAGNETITE ( 5%)
Size(mm): 0.01-0.1 Morphology: ANHEDRAL-CUBIC
IN GROUNDMASS;
OTHER ( 10%)
AMORPHOUS MESOSTASIS,REPLACED BY CLAY.MIN*
Alteration - CARBONATE ( 1%)
Location: VESICLES
CLAY MINERALS ( 10%)
Location: RANDOM Replacing: MESOSTASIS
Vesicles -
Size(mm): 0.2-0.5
Percent: 10
Location: RANDOM
Filling: CALCITE,
Shape: SPHERICAL
Filling: CLAY.MIN
Leg : 64 Top/Bottom Interval(mm): 1070/ 0 Describer: Fornari, D.
Hole: 474A Top of Core Depth(m) : 562.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 569.57 Sect/Pc #: 5/PCE 14A
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC,INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL-SUBHEDRAL
PARTIALLY REPLACED;
PLAGIOCLASE ( 10%)
Size(mm): TO 2 Morphology: LATHS
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP AUGITE?,PARTIALLY REPLACED (PROBABLY
ALTERED OL)*
Groundmass - OLIVINE ( 10%)
PLAGIOCLASE ( 25%)
CLINOPYROXENE ( 15%)
ILMENITE ( 5%)
GLASS ( 30%)
Alteration - CLAY MINERALS
Location: LATH EDGES Replacing: PLAG LATHS
MANY CPX AND OL MODERATELY TO COMPLETELY REPLACED
BY ALTERATION PRODUCTS*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 20/ 0 Describer: Fornari, D.
Hole: 474A Top of Core Depth(m) : 572.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 572.02 Sect/Pc #: 1/PCE 1
ROCK = PLAG-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR
JUST BELOW PILLOW INTERIORS AS CLAYSTONE OCCURS
ABOVE*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 50%)
Size(mm): 0.5-2 Morphology: LATHS
SOME INTERGROWTHS;
CLINOPYROXENE ( 20%)
Size(mm): 0.25-5 Morphology: SUBHEDRAL-ANHEDRAL
TITANIFEROUS;
SPINEL ( 0%)
Groundmass - OLIVINE ( 2%)
PERCENTAGE QUESTIONABLE;
PLAGIOCLASE ( 15%)
CLINOPYROXENE ( 5%)
OPAQUE MINERALS ( 3%)
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
Alteration - CARBONATE
Location: VEINLETS
CLAY MINERALS ( 0%)
ZEOLITE
Location: VEINLETS
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 70/ 0 Describer: Fornari, D.
Hole: 474A Top of Core Depth(m) : 572.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 576.57 Sect/Pc #: 4/PCE 1A
ROCK = PLAG-CPX-OL PHYRIC DOLERITE;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: OTHER
SILL AT BASE OF FLOW*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.25-0.6 Morphology: SUBHEDRAL-ANHEDRAL
ALL ALTERED AND REPLACED BY BOWLINGITE;
PLAGIOCLASE ( 50%)
Size(mm): 0.5-2 Morphology: LATHS
CLINOPYROXENE ( 10%)
Size(mm): 0.25-1 Morphology: ANHEDRAL LATHS
APPROX COMP AUGITE,FRACTURED ALONG CLEAVAGE
TRACES*
Groundmass - PLAGIOCLASE ( 20%)
CLINOPYROXENE ( 5%)
MAGNETITE ( 3%)
Size(mm): 0.1
ILMENITE ( 3%)
Size(mm): 0.1-0.3
GLASS ( 4%)
ALTERED*
Alteration - BOWLINGITE ( 5%)
Location: OL Replacing: OL
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 100/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 581.10 Sect/Pc #: 1/PCE 2A
ROCK = PLAG MODERATELY PHYRIC DOLERITE;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 2 Morphology: TABULAR,AGGREGATES
RESORBED MAGMA,ZONED*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.3-0.5 Morphology: ANHEDRAL
PLAGIOCLASE ( 40%)
Size(mm): 0.3-1.0 Morphology: LATH-LIKE
APPROX COMP AN45-55,ZONED,OPHITICALLY ENCLOSED IN
CPX;
CLINOPYROXENE ( 40%)
Size(mm): TO 2 Morphology: ANHEDRAL,PLATE-LIKE
APPROX COMP AUGITE,PALE BROWN,PLATE-LIKE XTLS
FREQUENTLY ENCLOSING PLAG;
MAGNETITE ( 5%)
Size(mm): <0.5 Morphology: ANHEDRAL-EUHEDRAL
Leg : 64 Top/Bottom Interval(mm): 1100/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 582.10 Sect/Pc #: 1/PCE 2F
ROCK = PLAG MODERATELY PHYRIC DOLERITE;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 2-5 Morphology: TABULAR,AGGREGATES
RESORBED MARGINS,ZONED*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.3-0.5 Morphology: ANHEDRAL
PLAGIOCLASE ( 40%)
Size(mm): 0.3-1.0 Morphology: LATH-LIKE
APPROX COMP AN40-50,OPHITICALLY ENCLOSED IN CPX;
CLINOPYROXENE ( 40%)
Size(mm): TO 2 Morphology: ANHEDRAL,PLATE-LIKE
APPROX COMP AUGITE,PALE BROWN,PLATE-LIKE XTLS
FREQUENTLY ENCLOSING PLAG;
MAGNETITE ( 5%)
Size(mm): <0.5 Morphology: ANHEDRAL-EUHEDRAL
Alteration - BOWLINGITE ( 5%)
Location: OL Replacing: OL
Leg : 64 Top/Bottom Interval(mm): 210/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 582.71 Sect/Pc #: 2/PCE 3
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,PILOTAXITIC GROUNDMASS;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE
SEE ALTERATION CODES;
PLAGIOCLASE ( 5%)
Size(mm): 1-6 Morphology: SUBHEDRAL,TABULAR
APPROX COMP AN70,MANY INCLUSIONS,RESORBED MARGINS,
ZONED,MEGACRYSTS;
PLAGIOCLASE ( 10%)
Size(mm): 0.5-1 Morphology: SUBHEDRAL,LATH-LIKE OR
Morphology: TABULAR
APPROX COMP ?AN60-70;
SPINEL ( 3%)
Size(mm): 0.1-0.2 Morphology: CUBIC
?CHROME SPINEL*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.2-0.4
QUENCH TEXTURE,MICROLITES;
CLINOPYROXENE ( 20%)
Size(mm): <0.1 Morphology: DENDRITIC
QUENCH TEXTURE;
MAGNETITE ( 10%)
Size(mm): <0.1
DISSEMINATED,QUENCH TEXTURE;
OTHER ( 30%)
AMORPHOUS GROUNDMASS (MESOSTASIS)*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: MESOSTASIS
BOWLINGITE ( 5%)
Location: RANDOM Replacing: OL
IN EUHEDRAL PSEUDOMORPHS OF OL (0.5-1.0 MM
ACROSS)*
Leg : 64 Top/Bottom Interval(mm): 350/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 581.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 582.85 Sect/Pc #: 2/PCE 5
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,PILOTAXITIC GROUNDMASS;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE
SEE ALTERATION SECTION;
PLAGIOCLASE ( 5%)
Size(mm): 1-5 Morphology: SUBHEDRAL,TABULAR,AGGREGATES
APPROX COMP AN70,MANY INCLUSIONS,RESORBED MAGMA,
MEGACRYSTS;
PLAGIOCLASE ( 10%)
Size(mm): 0.5-1 Morphology: SUBHEDRAL,LATH-LIKE,TABULAR
APPROX COMP ?AN70;
SPINEL ( 3%)
Size(mm): 0.1-0.2 Morphology: CUBIC
?CHROME SPINEL*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.2-0.4
MICROLITES AND GROWING ON PHENOS;
CLINOPYROXENE ( 40%)
Size(mm): <0.1 Morphology: DENDRITIC,WHEAT SHEAVES
PERCENTAGE QUESTIONABLE;
MAGNETITE ( 5%)
Size(mm): <0.1 Morphology: DISSEMINATED
Alteration - CLAY MINERALS ( 5%)
Location: VEINS
BOWLINGITE ( 5%)
Location: RANDOM Replacing: OL
EUHEDRAL PSEUDOMORPHS (0.5-1.0 MM ACROSS)*
Vesicles -
Size(mm): 1
Percent: 5
Location: RANDOM
Filling: CLAY.MIN
Shape: SPHERICAL
VESICLES HAVE A GREEN CLAY.MIN LINING*
Leg : 64 Top/Bottom Interval(mm): 1100/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 590.00 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 591.10 Sect/Pc #: 1/PCE 16
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,VARIOLITIC;
Where sampled: FLOW INTERIOR
NEAR CLAY.MIN VEIN*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 0.3 Morphology: SUBHEDRAL
MICROPHENOS;
PLAGIOCLASE ( 10%)
Size(mm): 1-5 Morphology: AGGREGATES,TABULAR
RESORBED EDGES;
SPINEL ( <2%)
Size(mm): 0.1
CR-SPINEL*
Groundmass - OLIVINE ( 5%)
Size(mm): <0.3 Morphology: SUBHEDRAL
PROBABLY MICROPHENOS;
PLAGIOCLASE ( 40%)
Size(mm): 0.2-1.0 Morphology: LATHS
MICROLITES AND LATHS;
CLINOPYROXENE ( 20%)
Size(mm): TO 1.0 Morphology: LATHS,ANHEDRAL
BROWN AUGITE;
MAGNETITE ( 5%)
Size(mm): TO 0.3 Morphology: GRANULAR
DISSEMINATED;
ILMENITE ( 2%)
MICROCRYST GROUNDMASS ( 20%)
MESOSTASIS*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS
Vesicles -
Size(mm): 0.8-1.2
Percent: 4
Location: RANDOM
Filling: CLAY.MIN
Shape: SPHERICAL
Leg : 64 Top/Bottom Interval(mm): 1220/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 590.00 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 594.22 Sect/Pc #: 3/PCE 12
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,VARIOLITIC-QUENCHED,PILOTAXITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 5-8%)
Size(mm): 0.3-2 Morphology: EUHEDRAL
MOSTLY REPLACED BY BOWLINGITE;
PLAGIOCLASE ( 15%)
Size(mm): 0.5-8 Morphology: AGGREGATES,TABULAR,LATH-SHAPE
LARGE AGGREGATE MEGACRYSTS,SMALLER TABULAR AND
LATH-SHAPED PHENOCRYSTS;
SPINEL ( 1%)
Size(mm): 0.1
RED CHROME SPINEL*
Groundmass - COMBINATION
INCLUDES OL + PLAG + CPX + MAGN,VERY FINE GRAINED
WITH PLUMOSE QUENCH PYX AND PILOTAXITIC FELDSPAR
MICROLITES,DISSEMINATED ORE GRANULES;
CLINOPYROXENE
Morphology: PLUMOSE
QUENCH;
PLAGIOCLASE
MICROLITES,PILOTAXITIC;
MAGNETITE
DISSEMINATED GRANULES*
Alteration - CLAY MINERALS ( .5%)
Location: GROUNDMASS
BOWLINGITE ( 5%)
Replacing: OL
Leg : 64 Top/Bottom Interval(mm): 250/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 590.00 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 596.25 Sect/Pc #: 5/PCE 3
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,VARIOLITIC GROUNDMASS;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.1-0.5 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,ALTERED TO BOWLINGITE;
PLAGIOCLASE ( >60%)
Size(mm): 13
AGGREGATE OF INTERGROWN XTLS,MEGACRYSTIC,RESORBED
WITH SODIUM-RICH MARGIN;
SPINEL ( 2%)
Size(mm): 0.1 Morphology: EUHEDRAL
RED CHROME SPINEL*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 10%)
Size(mm): 0.4-1.0 Morphology: LATHS
LATHS AND MICROLITES,LARGE ONES ARE MICROPHENOS;
CLINOPYROXENE
PRESENT BUT INDISTINGUISHABLE FROM GROUNDMASS
MESOSTASIS;
MAGNETITE
DISSEMINATED;
ILMENITE
DISSEMINATED;
MICROCRYST GROUNDMASS ( 20%)
MESOSTASIS*
Alteration - CLAY MINERALS ( 2-3%)
Location: MESOSTASIS,OL
ALTERATION IN MESOSTASIS AND AROUND OLIVINES;
BOWLINGITE
Replacing: OL
Leg : 64 Top/Bottom Interval(mm): 50/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 599.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 599.05 Sect/Pc #: 1/PCE 1A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,PILOTAXITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.3-0.8 Morphology: EUHEDRAL-ANHEDRAL
BADLY ALTERED;
PLAGIOCLASE ( 5%)
Size(mm): TO 5 Morphology: ROUNDED AGGREGATES
ABSORBED EDGES,MEGACRYST;
PLAGIOCLASE ( 10%)
Size(mm): 0.3-2 Morphology: LATH-LIKE,SUBHEDRAL
SPINEL ( 1%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL
RED CR-SPINEL,IN GROUNDMASS AND IN LARGE PLAG*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.6
MICROLITIC;
MICROCRYST GROUNDMASS ( 30%)
INCLUDES CPX + MAGN + ILMENITE + MESOSTASIS,VERY
FINE GRAINED,INDISTINGUISHABLE*
Alteration - CALCITE ( 5%)
Location: VEIN
BOWLINGITE ( 10%)
Location: GROUNDMASS Replacing: OL
REPLACING OL AND IN GROUNDMASS*
Vesicles -
Size(mm): <1
Percent: 5
Location: RANDOM
Filling: MESOSTASIS
Shape: SPHERICAL
FILLING IS IRON-RICH MESOSTASIS,MICROLITES RIM THE
VESICLES*
Leg : 64 Top/Bottom Interval(mm): 190/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 599.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 599.19 Sect/Pc #: 1/PCE 1C
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCHED-SPHERULITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): TO 3 Morphology: SUBHEDRAL-ANHEDRAL
SPINEL ( <1%)
Size(mm): 0.1-0.2 Morphology: EUHEDRAL
RED CR-SPINEL*
Groundmass - MICROCRYST GROUNDMASS
INCLUDES OL + PLAG + CPX + MAGN + ILMENITE,VERY
FINE-GRAINED MATRIX WITH PLAG MICROLITES,
SPERULITES SEEN BUT NO GLASS*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: MESOSTASIS
Leg : 64 Top/Bottom Interval(mm): 880/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 599.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 599.88 Sect/Pc #: 1/PCE 7D
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,PILOTAXITIC-VARIOLITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.1-1.0 Morphology: SUBHEDRAL-EUHEDRAL
OLIVINES VERY FRESH IN THIS SPECIMEN;
PLAGIOCLASE ( 5%)
Size(mm): 2-10 Morphology: SUBHEDRAL,TABULAR,AGGREGATES
APPROX COMP AN70,MANY INCLUSIONS,RESORBED MARGINS,
MEGACRYSTS;
PLAGIOCLASE ( 10%)
Size(mm): 0.5-1.0 Morphology: SUBHEDRAL,LATH-LIKE,TABULAR
APPROX COMP AN70?;
SPINEL ( 3%)
Size(mm): 0.1-0.2 Morphology: CUBIC
?CHROME SPINEL*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.1-0.5
MICROLITES;
CLINOPYROXENE
NOT DISTINGUISHABLE FROM MESOSTASIS;
MAGNETITE ( 5%)
DISSEMINATED THROUGHOUT GROUNDMASS;
MICROCRYST GROUNDMASS ( 60%)
MESOSTASIS*
Alteration - CLAY MINERALS ( 2%)
Location: MESOSTASIS Replacing: MESOSTASIS
OLIVINES VERY FRESH IN THIS SPECIMEN*
Vesicles -
Percent: 0
NONE SEEN*
Leg : 64 Top/Bottom Interval(mm): 1410/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 599.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 601.91 Sect/Pc #: 2/PCE 13C
ROCK = PLAG MODERATELY PHYRIC BASALT
SMALL SLIDE SAMPLE;
Texture: MODERATELY PORPHYRITIC,SUBSPHERULITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 0.2-1.5 Morphology: LATH-LIKE
QUENCH OVERGROWTHS DEVELOPING;
OLIVINE ( 0%)
NOTE ABSENCE OF OL PHENOS*
Groundmass - MICROCRYST GROUNDMASS ( 80%)
INCLUDES PLAG + CPX + MAGN + MESOSTASIS,TOO FINE
TO BE DISTINGUISHED*
Alteration - ZEOLITE ( 10%)
Location: VEIN,
Location: VESICLES
Vesicles -
Size(mm): 0.5
Percent: <1
Location: RANDOM
Filling: ZEOLITE
Shape: SPHERICAL
RARE*
Leg : 64 Top/Bottom Interval(mm): 140/ 0 Describer: Fornari, D.
Hole: 474A Top of Core Depth(m) : 608.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 609.64 Sect/Pc #: 2/PCE 3
ROCK = PLAG-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: FLOW INTERIOR
BASE OF A PILLOW SEQUENCE*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.25-0.5 Morphology: EUHEDRAL-SUBHEDRAL
ALTERED TO BOWLINGITE,MICROPHENOS;
PLAGIOCLASE ( 30%)
Size(mm): 2-4
MEGACRYSTS,COMMONLY NORMALLY ZONED,INCLUSIONS OF
CUBIC BLEBS OF GLASS;
CLINOPYROXENE ( 5%)
Size(mm): 0.5-1 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP AUGITE,PSEUDOMORPHED BY ALTERATION
MINS*
Groundmass - PLAGIOCLASE ( 20%)
CLINOPYROXENE ( 5%)
OPAQUE MINERALS ( 4%)
INCLUDES MAGN + ILMENITE;
GLASS ( 30%)
Alteration - CLAY MINERALS
Location: VESICLES
ZEOLITE
Location: VESICLES
BOWLINGITE
Replacing: OL
Vesicles -
Size(mm): 0.5-0.75
Percent: <1
Filling: CLAY.MIN,
Shape: ROUND
Filling: ZEOLITES
Leg : 64 Top/Bottom Interval(mm): 300/ 0 Describer: Fornari, D.
Hole: 474A Top of Core Depth(m) : 608.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 609.80 Sect/Pc #: 2/PCE 4
ROCK = PLAG PHYRIC BASALT
PILLOW BASALT;
Texture: PORPHYRITIC,PILOTAXITIC;
Where sampled: GLASSY MARGIN + NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): 0.5-4 Morphology: LATHS
LATHS AND MEGACRYSTS,MANY NORMALLY ZONED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.25-0.5 Morphology: LATH
MICROLITES + TINY LATHS;
GLASS ( 50%)
SOME ALTERED TO PALAGONITE,SIDEROMELANE*
Alteration - PALAGONITE
Replacing: GLASS
SOME GLASS ALTERED TO PALAG/SIDEROMELANE*
Leg : 64 Top/Bottom Interval(mm): 470/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 617.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 617.47 Sect/Pc #: 1/PCE 3
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,FINE-GRAINED,VARIOLITIC;
Where sampled: FLOW INTERIOR
ADJACENT TO VEINED AND SHEARED AREA*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): TO 5 Morphology: TABULAR,ROUNDED,LATH-SHAPED
LARGE TABULAR ROUNDED MEGACRYSTS AND SMALLER
LATH-SHAPED PHENOS*
Groundmass - MICROCRYST GROUNDMASS
INCLUDES OL + PLAG + CPX + MAGN + ILMENITE,VERY
FINE-GRAINED QUENCHED GROUNDMASS COMPRISING PLAG
MICROLITES + WHEATSHEAF PYX + ORE*
Leg : 64 Top/Bottom Interval(mm): 620/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 617.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 619.12 Sect/Pc #: 2/PCE 5E
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,VARIOLITIC;
Where sampled: OTHER
ADJACENT TO VEIN*
Phenocrysts- OLIVINE ( 5%)
Size(mm): <0.5 Morphology: ANHEDRAL
MICROPHENOS,MAY PARTIALLY BE GROUNDMASS OL;
PLAGIOCLASE ( 10%)
Size(mm): 0.5-2 Morphology: LATH-SHAPED,ROUND,TABULAR
LATH-SHAPED AND LARGE ROUNDED TABULAR MEGACRYSTS*
Groundmass - OLIVINE
SEE PHENOCRYSTS CODES;
PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.5 Morphology: LATHS
MICROLITES;
MICROCRYST GROUNDMASS
INCLUDES CPX + MAGN + ILMENITE,FINE-GRAINED
GROUNDMASS*
Alteration - CARBONATE ( 1-2%)
Location: VESICLES
CLAY MINERALS ( 5%)
Location: MESOSTASIS,
Location: VESICLES
ZEOLITE ( 5%)
Location: VEIN
Vesicles -
Size(mm): 1
Percent: 5
Location: RANDOM
Filling: CLAY.MIN,
Shape: SPHERICAL
Filling: CALCITE
Leg : 64 Top/Bottom Interval(mm): 720/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 617.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 619.22 Sect/Pc #: 2/PCE 7A
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,VARIOLITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 8%)
Size(mm): 0.5-1.3 Morphology: TABULAR,LATH-LIKE,EQUANT
HEAVILY RESORBED*
Groundmass - OLIVINE ( 5%)
Size(mm): <0.5 Morphology: ANHEDRAL,SKELETAL
PERCENTAGE QUESTIONABLE,GROUNDMASS OR
MICROPHENOS?;
PLAGIOCLASE ( 50%)
Size(mm): <1.0 Morphology: LATH-LIKE
MICROCRYST GROUNDMASS ( 30%)
INCLUDES CPX + MAGN + ILMENITE,VERY FINE-GRAINED,
PERCENTAGE APPROXIMATE*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS,
Location: VESICLES
LOCATED THROUGHOUT GROUNDMASS*
Vesicles -
Size(mm): 0.3-1.0
Percent: 10
Location: RANDOM
Filling: CLAY.MIN
Shape: SPHERICAL
Leg : 64 Top/Bottom Interval(mm): 1460/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 617.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 621.46 Sect/Pc #: 3/PCE 12
ROCK = PLAG MODERATELY PHYRIC DOLERITE
OR COARSE BASALT;
Texture: MODERATELY PORPHYRITIC,INTERGRANULAR-SUBOPHITIC;
Where sampled: FLOW INTERIOR
OR SILL INTERIOR*
Phenocrysts- OLIVINE
SEE ALTERATION CODES;
PLAGIOCLASE ( 5%)
Size(mm): 0.5-2 Morphology: TABULAR,LATH-LIKE
Groundmass - OLIVINE
SEE ALTERATION CODES,SUBOPHITICALLY INTERGROWN
WITH PLAG + CPX;
PLAGIOCLASE ( 40%)
Size(mm): 0.2-1 Morphology: LATH-LIKE
SUBOPHITICALLY INTERGROWN WITH OL + CPX;
CLINOPYROXENE ( 30%)
Size(mm): 0.2-1.5 Morphology: ANHEDRAL
APPROX COMP AUGITE,SUBOPHITICALLY INTERGROWN WITH
OL + PLAG;
MAGNETITE ( 5%)
ILMENITE ( 2%)
Alteration - BOWLINGITE ( 20%)
Replacing: OL PHENOS,OL
Replacing: GROUNDMASS
PSEUDOMORPHS,REPLACES BOTH OL PHENOS + GROUNDMASS
OL*
Leg : 64 Top/Bottom Interval(mm): 160/ 0 Describer: Saunders, A.
Hole: 474A Top of Core Depth(m) : 617.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 621.66 Sect/Pc #: 4/PCE 1C
ROCK = PLAG MODERATELY PHYRIC DOLERITE
OR COARSE BASALT;
Texture: MODERATELY PORPHYRITIC,INTERGRANULAR-SUBOPHITIC;
Where sampled: FLOW INTERIOR
OR SILL INTERIOR*
Phenocrysts- OLIVINE
SEE ALTERATION CODES;
PLAGIOCLASE ( 5%)
Size(mm): 0.5-2 Morphology: TABULAR,LATH-LIKE
Groundmass - OLIVINE
SEE ALTERATION CODES;
PLAGIOCLASE ( 40%)
Size(mm): 0.2-1 Morphology: LATH-LIKE
PARTIALLY ENCLOSED IN CPX;
CLINOPYROXENE ( 30%)
APPROX COMP AUGITE,PARTIALLY ENCLOSED IN PLAG;
MAGNETITE ( 5%)
Size(mm): 0.1-0.5 Morphology: CUBIC,ANHEDRAL
INTERGRANULAR;
ILMENITE ( 2%)
Morphology: ELONGATE
PERCENTAGE QUESTIONABLE*
Alteration - BOWLINGITE ( 20%)
Replacing: OL PHENOS,OL
Replacing: GROUNDMASS
PSEUDOMORPHS,REPLACES BOTH OL PHENOS + GROUNDMASS
OL*
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