Leg : 54 Top/Bottom Interval(mm): 100/ 140 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 32.12 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT
SLIGHTLY ALTERED;
Texture: GLASSY, MICROLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.1 Morphology: EUHEDRAL
PLAGIOCLASE ( 1%)
Size(mm): .09-.19 Morphology: SKELETAL LATHS
PLAG+OL ARE MICROPHENOCRYSTS*
Groundmass - OLIVINE ( 0.5%)
PLAGIOCLASE
Morphology: NEEDLES
MAGNETITE ( 2-3%)
GLASS ( 90%)
DISSEMINATED;
THE GROUNDMASS IS DARK BROWN WITH SHEAF-LIKE
VARIOLES OF PLAG AND PYX INCIPIENT XTLS*
Alteration - SMECTITE
Replacing: GROUNDMASS MINERALS
MOST LIKELY REPLACING OL,SMECTITE IS YELLOW TO
DIRTY GREEN COLOR,LOW DEGREE OF ALTERATION*
Vesicles -
Percent: 3
Filling: SMECTITES
Shape: VARIABLE
YELLOWISH DIRTY GREEN COLOR*
Leg : 54 Top/Bottom Interval(mm): 400/ 440 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 32.42 Sect/Pc #: 1/PCE 6
ROCK = APHYRIC BASALT
SLIGHTLY ALTERED;
Texture: GLASSY - VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Morphology: XTLS, SKELETAL XTLS
CLINOPYROXENE ( 0.1%)
Morphology: SUBHEDRAL
PLAG+CPX ARE MICROPHENOCRYSTS*
Groundmass - OLIVINE ( 0.1%)
PLAGIOCLASE ( 15%)
Morphology: NEEDLE-LIKE, SKELETAL
MAGNETITE ( 2-3%)
DISSEMINATED;
GLASS ( 80%)
Alteration - SMECTITE ( 2-3%)
Replacing: GROUNDMASS MINERALS
LOW DEGREE OF ALTERATION*
Vesicles -
Percent: 2
Filling: SMECTITE
Shape: ROUNDED,
Shape: IRREGULAR
VESICLES ARE THE SIZE OF A PINHOLE*
Leg : 54 Top/Bottom Interval(mm): 510/ 540 Describer: Fodor, R.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 32.53 Sect/Pc #: 1/PCE 7
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR-INTERSERTAL*
Groundmass - OLIVINE ( TR%)
PLAGIOCLASE ( 43%)
Size(mm): <0.10
CLINOPYROXENE ( 15.4%)
Size(mm): 0.01
OPAQUE MINERALS ( 8%)
INCLUDES MAGN+ILMENITE;
GLASS ( 33%)
Vesicles -
Percent: 1
Filling: PHYLLOSILICATES
Leg : 54 Top/Bottom Interval(mm): 510/ 540 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 32.53 Sect/Pc #: 1/PCE 7
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - OLIVINE ( TR%)
PLAGIOCLASE ( 40%)
Morphology: LATHS,ACICULAR
CLINOPYROXENE ( 30%)
Size(mm): .01 - 0.5 Morphology: FIBROUS MATS
MAGNETITE ( 5%)
GLASS ( 20%)
Alteration - CLAY MINERALS ( 3%)
Replacing: GROUNDMASS,PYX
MOSTLY SMECTITE*
Vesicles -
Percent: 1
Filling: SMECTITE
Leg : 54 Top/Bottom Interval(mm): 660/ 720 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 32.69 Sect/Pc #: 1/PCE 9
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC-INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 0.5%)
MICROPHENOCRYSTS*
Groundmass - OLIVINE
ID UNCERTAIN FOR OL;
PLAGIOCLASE ( 40%)
Size(mm): 0.05-0.4 Morphology: LATHS
CLINOPYROXENE ( 40%)
Morphology: MAT-LIKE
COMBINATION ( 20%)
INCLUDES GLASS+ILMENITE+MAGN*
Alteration - SMECTITE ( 2-3%)
Location: GROUNDMASS Replacing: CPX
Vesicles -
Percent: 1-2
Filling: SMECTITE
Shape: IRREGULAR
Leg : 54 Top/Bottom Interval(mm): 1160/1190 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 33.18 Sect/Pc #: 1/PCE 15
ROCK = PLAG SPARSELY MICROPHYRIC BASALT;
Texture: VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 1-2%)
Size(mm): 0.1-0.15
Groundmass - PLAGIOCLASE (15-20%)
Size(mm): 0.05-0.1 Morphology: NEEDLE-LIKE
CLINOPYROXENE ( 2-3%)
Size(mm): <0.01
GROUNDMASS SHOWS SHEAF-LIKE VARIOLES OF INCIPIENT
XTLS OF PLAG+CPX;
MAGNETITE ( 3-5%)
GLASS (75-80%)
Alteration - SMECTITE
Location: GROUNDMASS Replacing: CPX
CRACK ACROSS SECTION IS FILLED WITH SMECTITE*
Vesicles -
Size(mm): 0.1-0.2
Percent: 2-3
Location: NEAR MARGINS
Filling: SMECTITE
Shape: IRREGULAR,
Shape: ROUND
Leg : 54 Top/Bottom Interval(mm): 520/ 600 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 34.06 Sect/Pc #: 2/PCE 6
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC-INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): <0.098 Morphology: LATHS
Groundmass - OLIVINE ( TR%)
PLAGIOCLASE ( 40%)
Size(mm): .01-0.1 Morphology: LATHS,NEEDLE-LIKE
CLINOPYROXENE ( 30%)
MAT-LIKE AGGREGATES OF NEEDLE-SHAPED XTLS;
MAGNETITE ( <5%)
Size(mm): <0.001
DISSEMINATED;
GLASS ( 20%)
Alteration - CLAY MINERALS ( 3%)
Location: GROUNDMASS Replacing: PLAG,CPX
SOME OF THE PLAG IS ALTERED*
Vesicles -
Size(mm): .001-.01
Filling: SMECTITE
Shape: ROUNDED
Leg : 54 Top/Bottom Interval(mm): 520/ 601 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 32.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 34.06 Sect/Pc #: 2/PCE 6
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.098 Morphology: LATHS
CLINOPYROXENE ( TR%)
Size(mm): 0.098 Morphology: EUHEDRAL
PLAG+CPX ARE MICROPHENOCRYSTS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.098 Morphology: LATHS,NEEDLE-LIKE
OCCASIONALLY SKELETAL;
CLINOPYROXENE ( 20%)
Size(mm): <0.098
MATS COMPOSED OF NEEDLE-LIKE XTLS;
MAGNETITE ( <5%)
GLASS (40-45%)
Alteration - CLAY MINERALS ( 2-3%)
Location: GROUNDMASS
Vesicles -
Size(mm): <.098
Percent: RARE
Shape: ROUNDED
Leg : 54 Top/Bottom Interval(mm): 00/ 70 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 41.54 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT;
Texture: GLASSY WITH MICROLITES;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( TR%)
PLAGIOCLASE ( <0.5%)
Size(mm): 0.1-0.4 Morphology: SKELETAL XTLS
CLINOPYROXENE ( TR%)
PLAG+OL+CPX ARE MICROPHENOCRYSTS*
Groundmass - PLAGIOCLASE ( 5%)
Morphology: NEEDLE-LIKE,LATHS
CLINOPYROXENE ( 1%)
Morphology: IRREGULAR
MAGNETITE ( 3%)
DISSEMINATED GRAINS;
GLASS ( 90%)
SHOWS SHEAF-LIKE VARIOLES OF INCIPIENT XTLS OF
PLAG+CPX IN PLACES*
Alteration - SMECTITE ( 2%)
Location: GROUNDMASS Replacing: CPX
YELLOW TO GREENISH COLOR,ALTERATION IN GROUNDMASS
IS LIMITED*
Vesicles -
Size(mm): <0.09
Percent: <0.5
Filling: SMECTITE
Shape: ROUNDED,
Shape: IRREGULAR
SOME VESICLES HAVE A CENTRAL CAVITY*
Leg : 54 Top/Bottom Interval(mm): 70/ 150 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 41.61 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT;
Texture: GLASSY,HYALOPILITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.1 Morphology: SUBEQUANT
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): 0.01-0.02 Morphology: MICROLITES
CLINOPYROXENE ( TR%)
MARGINS OF SECTION SHOW LIGHT BROWN COLOR WITH
DARK GLOBULES,SOMETIMES THESE GLOBULES ENCLOSE
PHENOCRYSTS OF PLAG+CPX;
MAGNETITE ( 2-3%)
DISSEMINATED;
GLASS ( 90%)
Vesicles -
Size(mm): .1-.0098
Percent: 2-3
Location: THROUGHOUT
Filling: SMECTITE
Shape: ROUNDED
MAJORITY ARE VERY SMALL AND EMPTY,LARGER ONES
ARE FILLED,SOME HAVE CENTRAL CAVITY*
Leg : 54 Top/Bottom Interval(mm): 150/ 230 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 41.69 Sect/Pc #: 1/PCE 3
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: HYALOPILITIC*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.1-0.5 Morphology: TABULAR
CLINOPYROXENE ( TR%)
Size(mm): 0.05-0.1 Morphology: SUBHEDRAL
Groundmass - OLIVINE
ID UNCERTAIN FOR OL;
PLAGIOCLASE ( 8%)
Size(mm): 0.05-0.1 Morphology: NEEDLE-LIKE, SKELETAL
GROUNDMASS SHOWS INCIPIENT XTLS OF PYX AND PLAG;
MAGNETITE ( 2-3%)
Size(mm): .001
DISSEMINATED;
GLASS ( 80%)
Vesicles -
Size(mm): .1-.0098
Percent: 2-3
Filling: EMPTY
Shape: ROUNDED
Leg : 54 Top/Bottom Interval(mm): 300/ 350 Describer: Srivastava, R.K.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 41.83 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT
ROCK IS FAIRLY FRESH;
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.098
MICROPHENOCRYSTS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.05 Morphology: THIN NEEDLES,LATHS
CLINOPYROXENE ( 20%)
Morphology: NEEDLE-LIKE
XTL AGGREGATE IN SHEAF-LIKE APPEARANCE;
MAGNETITE ( 3%)
Size(mm): 0.001
GLASS ( 55%)
Vesicles -
Size(mm): .01-.001
Percent: 1-2
Filling: EMPTY
Shape: ROUNDED
Leg : 54 Top/Bottom Interval(mm): 550/ 630 Describer: Humphris, S.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.09 Sect/Pc #: 1/PCE 9
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( <1%)
Morphology: SUBEQUANT,LATHS
Groundmass - PLAGIOCLASE ( 30%)
Morphology: SKELETAL LATHS
CLINOPYROXENE ( 20%)
Morphology: SHEAF-LIKE
GLASS ( 50%)
SLIGHTLY DEVITRIFIED*
Vesicles -
Percent: 2
Filling: EMPTY
Leg : 54 Top/Bottom Interval(mm): 750/ 800 Describer: Humphris, S.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.28 Sect/Pc #: 1/PCE 11
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- OLIVINE ( <1%)
Morphology: EUHEDRAL
PLAGIOCLASE ( 2%)
Size(mm): TO 0.5 Morphology: SUBEQUANT
CLINOPYROXENE ( 1%)
Size(mm): 0.1 Morphology: EUHEDRAL-SUBHEDRAL
Groundmass - OLIVINE
ID UNCERTAIN FOR OL;
PLAGIOCLASE ( 10%)
Size(mm): 0.01 Morphology: SKELETAL
WITH FEATHERY INCLUSIONS;
CLINOPYROXENE ( 5%)
Size(mm): <0.01 Morphology: ANHEDRAL, SHEAF-LIKE
GLASS ( 80%)
FAIRLY FREST*
Alteration - CLAY MINERALS ( 2%)
Location: VESICLES, Replacing: GROUNDMASS XTLS
Location: GROUNDMASS
CLAY IS GREEN*
Vesicles -
Filling: CLAY.MIN
CLAY IS GREEN;
Leg : 54 Top/Bottom Interval(mm): 950/1010 Describer: Mattey, D.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.48 Sect/Pc #: 1/PCE 14
ROCK = PLAG SPARSELY MICROPHYRIC BASALT;
Texture: INTERGRANULAR-INTERSERTAL,POST SUBOPHITIC*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.01 Morphology: EUHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): <0.5 Morphology: LATHS
CLINOPYROXENE ( 25%)
Size(mm): <0.1 Morphology: SUBOPHITIC
GLASS ( 40%)
OPAQUE*
Vesicles -
Size(mm): 0.5
Percent: 5
Filling: EMPTY
Shape: ROUNDED
Leg : 54 Top/Bottom Interval(mm): 1010/1100 Describer: Humphris, S.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.56 Sect/Pc #: 1/PCE 15
ROCK = PLAG-CPX SPARSELY MICROPHYRIC BASALT;
Texture: VARIOLITIC,GLASSY*
Phenocrysts- OLIVINE
ID UNCERTAIN FOR OL
PLAGIOCLASE ( 2%)
Size(mm): TO 0.1 Morphology: SUBEQUANT,EUHEDRAL
CLINOPYROXENE ( 1%)
Morphology: SUBHEDRAL
Groundmass - OLIVINE
ID UNCERTAIN FOR OL;
PLAGIOCLASE ( 3%)
Size(mm): <0.05 Morphology: SKELETAL LATHS
WITH FEATHERY TERMINATIONS;
CLINOPYROXENE ( 1%)
Size(mm): <0.01 Morphology: FEATHERY,SHEAF-LIKE
GLASS ( 90%)
DEVITRIFIED*
Vesicles -
Percent: 1
Filling: EMPTY
Shape: ROUNDED
Leg : 54 Top/Bottom Interval(mm): 1100/1190 Describer: Mattey, D.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.65 Sect/Pc #: 1/PCE 16
ROCK = PLAG-OL-CPX MOD PHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.05 Morphology: GRANULAR
WITH PLAG INCLUSIONS;
PLAGIOCLASE ( 2%)
Size(mm): 1.5 Morphology: EUHEDRAL
CLINOPYROXENE ( 1%)
Size(mm): 0.5 Morphology: SUBHEDRAL
Groundmass - OLIVINE ( 2%)
Size(mm): 0.02 Morphology: SUBHEDRAL
PLAGIOCLASE ( 10%)
Size(mm): <0.5 Morphology: EUHEDRAL,LATHS
OSCILLATORY ZONING,OCCASIONAL GLOMEROCRYSTS;
CLINOPYROXENE ( 2%)
Size(mm): <0.1
OCCASIONAL GLOMEROCRYSTS;
GLASS ( 80%)
Alteration - CLAY MINERALS
Replacing: OL
FERROUS OXIDE
Replacing: OL
CLAY.MINS+FE.OX PSEUDOMORPH OL,ID UNCERTAIN FOR OL*
Vesicles -
Size(mm): 0.5
Percent: 2
Filling: FE.OX,CLAY.MINS
Leg : 54 Top/Bottom Interval(mm): 1380/1440 Describer: Humphris, S.
Hole: 424B Top of Core Depth(m) : 41.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.91 Sect/Pc #: 1/PCE 19
ROCK = PLAG-CPX MOD MICROPHYRIC BASALT;
Texture: INTERGRANULAR-INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): TO 0.1 Morphology: SUBHEDRAL
CLINOPYROXENE ( <1%)
Size(mm): <0.1 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.01 Morphology: SKELETAL
WITH FEATHERY TERMINATIONS;
CLINOPYROXENE ( 10%)
Size(mm): <0.01 Morphology: SHEAF-LIKE
GLASS ( 70%)
SOME ALTERATION*
Alteration - CLAY MINERALS ( 1%)
Location: GROUNDMASS
YELLOW-GREEN,ALTERATION PATCHES IN GROUNDMASS,
POSSIBLY REPLACING XTL PHASE*
Vesicles -
Percent: 2
Filling: CLAY.MINS
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