Leg : 81 Top/Bottom Interval(mm): 810/ 0 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 670.50 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 672.81 Sect/Pc #: 2/PCE 4
ROCK = ALTERED PLAG-CPX-KSPAR MODERATELY PHYRIC BASALT
ANDESINE;
Texture: FINE-GRAINED,INTERSERTAL,MODERATELY PHYRIC;
Where sampled: NEAR FLOW TOP*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): .8 Morphology: LATHS
APPROX COMP AN55, ALTERED TO GREEN SMEC AND
POSSIBLY CHLORITE;
CLINOPYROXENE ( 2%)
Size(mm): .4 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
KFELDSPAR ( 1%)
Size(mm): .8 Morphology: LATHS
ALT. TO GREEN SMEC AND POSSIBLY CHLORITE*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .04
APPROX COMP AN40;
CLINOPYROXENE ( 20%)
Size(mm): .04 Morphology: SUBHEDRAL-ANHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .02 Morphology: SUBHEDRAL
Alteration - CLAY MINERALS ( 30%)
Location: GROUNDMASS, Replacing: GLASS AND PLAG
Location: PHENOS
GREEN*
Leg : 81 Top/Bottom Interval(mm): 1280/1300 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 670.50 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 673.29 Sect/Pc #: 2/PCE 7
ROCK = OL-PLAG-CPX PHYRIC BASALT
ALTERED;
Texture: FINE GRAINED,PHYRIC,INTERSERTAL;
Where sampled: FLOW INTERIOR NEAR FLOW TOP*
Phenocrysts- OLIVINE ( 4%)
Size(mm): .4-1.5 Morphology: ANHEDRAL-EUHEDRAL
FRESH;
PLAGIOCLASE ( 10%)
Size(mm): 1-2 Morphology: LATHS
FRESH,APPROX COMP AN55,SOME ALTERED TO CALCITE AND
BROWN SMEC;
CLINOPYROXENE ( 4%)
Size(mm): .4-1 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): .15-.3 Morphology: LATHS
FRESH,APPROX COMP AN55;
CLINOPYROXENE ( 35%)
Size(mm): .05-.1 Morphology: SUBHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .02 Morphology: SUBHEDRAL
ALKALI FELDSPAR ( 10%)
Size(mm): .1-.2 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
DARK BROWN*
Vesicles -
Size(mm): .08
Location: GROUNDMASS
Filling: CALCITE + SMEC
Shape: CIRCULAR
DARK BROWN SMEC*
Leg : 81 Top/Bottom Interval(mm): 900/ 950 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 670.50 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 674.42 Sect/Pc #: 3/PCE 10
ROCK = ALTERED PLAG-CPX-KSPAR PHYRIC BASALT;
Texture: FINE GRAINED,PHYRIC,INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 1-1.5 Morphology: LATHS
FRESH,SOME ZONED,SOME ALTERED TO CALCITE + SMEC,
APPROX COMP AN55-60;
CLINOPYROXENE ( 3%)
Size(mm): .5-1 Morphology: EUHEDRAL
FRESH,APPROX COMP AUGITE;
KFELDSPAR ( 2%)
Size(mm): .08 Morphology: SUBHEDRAL
APPROX COMP ANORTHOCLASE*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .1 Morphology: LATHS
FRESH, APPROX COMP AN50;
CLINOPYROXENE ( 30%)
Size(mm): .02 Morphology: ANHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 15%)
Size(mm): .05-.1 Morphology: SUBHEDRAL
ALKALI FELDSPAR ( 3%)
Size(mm): .04-.06 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
DARK BROWN*
Vesicles -
Size(mm): .5
Percent: 2
Location: GROUNDMASS
Filling: SMEC
Shape: CIRCULAR
DARK BROWN SMEC*
Leg : 81 Top/Bottom Interval(mm): 970/1000 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 689.50 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 690.49 Sect/Pc #: 1/PCE 5A
ROCK = PLAG-KSPAR SPARSELY PHYRIC BASALT
ALTERED;
Texture: FINE-GRAINED,INTERSERTAL,SPARSELY PHYRIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): .4 Morphology: LATHS
APPROX COMP AN50-55;
Groundmass - PLAGIOCLASE ( 32%)
Size(mm): .04-.2 Morphology: LATHS
APPROX COMP AN60,FRESH;
CLINOPYROXENE ( 25%)
Size(mm): .05 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE,FRESH;
MAGNETITE ( 10%)
Size(mm): .01-.03 Morphology: SUBHEDRAL-EUHEDRAL
Alteration - CLAY MINERALS ( 30%)
Location: GROUNDMASS Replacing: GLASS
GREEN AND BROWN SMEC*
Leg : 81 Top/Bottom Interval(mm): 790/ 820 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 737.00 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 739.31 Sect/Pc #: 2/PCE 5D
ROCK = CPX SPARSELY PHYRIC BASALT;
Texture: FINE GRAINED,INTERSERTAL,SPARSELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- CLINOPYROXENE ( 1%)
Size(mm): .4 Morphology: SUBHEDRAL
FRESH, APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): .2-.4 Morphology: LATHS
APPROX COMP AN60;
CLINOPYROXENE ( 30%)
Size(mm): .04-.06 Morphology: SUBHEDRAL-ANHEDRAL
MAGNETITE ( 14%)
Size(mm): .02-.04 Morphology: SUBHEDRAL
ALKALI FELDSPAR ( 10%)
Size(mm): .04-.1 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 30%)
Location: GROUNDMASS Replacing: GLASS
DARK BROWN*
Leg : 81 Top/Bottom Interval(mm): 1260/1280 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 746.50 Rock Type: IGNEOUS
Core: 76 Sample Midpoint(m) : 750.77 Sect/Pc #: 3/PCE 6C
ROCK = APHYRIC BASALT TO DIABASE;
Texture: MEDIUM-FINE GRAINED,SUBOPHITIC,GLASSY;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .25-.4 Morphology: LATHS
FRESH,APPROX COMP AN55;
CLINOPYROXENE ( 30%)
Size(mm): .1-.2 Morphology: SUBHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .02-.04 Morphology: SUBHEDRAL
ALKALI FELDSPAR ( 5%)
Size(mm): .2 Morphology: ANHEDRAL
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
YELLOW-BROWN*
Leg : 81 Top/Bottom Interval(mm): 820/ 850 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 746.50 Rock Type: IGNEOUS
Core: 76 Sample Midpoint(m) : 751.84 Sect/Pc #: 4/PCE 2B
ROCK = APHYRIC BASALT TO DIABASE;
Texture: FINE-MEDIUM GRAINED,SUBOPHITIC,GLASSY;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .2-.5 Morphology: LATHS
FRESH,APPROX COMP AN60;
CLINOPYROXENE ( 35%)
Size(mm): .15-.20 Morphology: SUBHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 14%)
Size(mm): .04 Morphology: EUHEDRAL-SUBHEDRAL
ALKALI FELDSPAR ( 10%)
Size(mm): .1-.2 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: GLASS
BROWN CLAY*
Vesicles -
Size(mm): .6
Percent: 1
Leg : 81 Top/Bottom Interval(mm): 1200/1230 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 803.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 804.72 Sect/Pc #: 1/PCE 5C
ROCK = ALTERED BASALT;
Texture: APHYRIC,INTERSERTAL,FINE GRAINED;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .04-.06 Morphology: SUBHEDRAL LATHS
APPROX COMP AN55;
CLINOPYROXENE ( 5%)
Size(mm): .02-.04 Morphology: ANHEDRAL-SUBHEDRAL
FRESH, APPROX COMP AUGITE;
MAGNETITE ( 25%)
Size(mm): .01-.02 Morphology: SUBHEDRAL
ALKALI FELDSPAR ( 5%)
Size(mm): .04 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 40%)
Location: GROUNDMASS Replacing: GLASS
INCLUDES YELLOW SMEC*
Leg : 81 Top/Bottom Interval(mm): 940/ 970 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 813.00 Rock Type: IGNEOUS
Core: 83 Sample Midpoint(m) : 813.96 Sect/Pc #: 1/PCE 1E
ROCK = APHYRIC BASALT TO DIABASE;
Texture: FINE-MEDIUM GRAINED,SUBOPHITIC,GLASSY;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .4-1 Morphology: LATHS
FRESH,APPROX COMP AN60;
CLINOPYROXENE ( 40%)
Size(mm): .2-.8 Morphology: ANHEDRAL-SUBHEDRAL
FRESH, APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .02 Morphology: SUBHEDRAL
ALKALI FELDSPAR ( 10%)
Size(mm): .2-.8 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
BROWN SMEC*
Vesicles -
Size(mm): .4
Percent: 5
Location: GROUNDMASS
Filling: SMEC
Shape: CIRCULAR
BROWN SMEC*
Leg : 81 Top/Bottom Interval(mm): 940/ 971 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 813.00 Rock Type: IGNEOUS
Core: 83 Sample Midpoint(m) : 813.96 Sect/Pc #: 1/PCE 1E
ROCK = DIABASE;
Texture: MEDIUM GRAINED,SUBOPHITIC,GLASSY;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .6-.8 Morphology: LATHS
APPROX COMP AN60,FRESH,SOME ALTERED TO SMEC;
CLINOPYROXENE ( 25%)
Size(mm): .2-.5 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .1-.2 Morphology: EUHEDRAL-SUBHEDRAL-SKELETAL
ALKALI FELDSPAR ( 5%)
Size(mm): .8 Morphology: LATHS
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
BROWN CLAY*
Vesicles -
Size(mm): 2-3
Percent: 20
Location: INTERSERTAL
Filling: CLAY
Shape: VERY IRREG
BROWN CLAY*
Leg : 81 Top/Bottom Interval(mm): 590/ 610 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 879.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 883.10 Sect/Pc #: 3/PCE 1A
ROCK = APHYRIC BASALT TO DIABASE;
Texture: MEDIUM-FINE GRAINED,SUBOPHITIC,GLASSY;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .1-.6 Morphology: LATHS
FRESH,APPROX COMP AN55;
CLINOPYROXENE ( 45%)
Size(mm): .05-.1 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .2 Morphology: EUHEDRAL-SUBHEDRAL
ALKALI FELDSPAR ( 5%)
Size(mm): .4 Morphology: LATHS
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
BROWN CLAYS*
Vesicles -
Size(mm): .4
Percent: 5
Location: GROUNDMASS
Filling: SMEC
Shape: IRREGULAR
BROWN CLAYS*
Leg : 81 Top/Bottom Interval(mm): 1250/1270 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 927.00 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 928.26 Sect/Pc #: 1/PCE 4B
ROCK = SLIGHTLY ALTERED DIABASE
SLIGHTLY ALTERED;
Texture: MEDIUM GRAINED,SUBOPHITIC,GLASSY;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .2-.6 Morphology: LATHS
FRESH, APPROX COMP AN55-60;
CLINOPYROXENE ( 35%)
Size(mm): .1-.2 Morphology: ANHEDRAL-SUBHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .05-.1 Morphology: EUHEDRAL-SKELETAL
ALKALI FELDSPAR ( 10%)
Size(mm): .2-.3 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
LIGHT BROWN*
Leg : 81 Top/Bottom Interval(mm): 980/1000 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 936.50 Rock Type: IGNEOUS
Core: 96 Sample Midpoint(m) : 940.49 Sect/Pc #: 3/
ROCK = DIABASE;
Texture: COARSE GRAINED,SUBOPHITIC,GLASSY;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 1.2-1.6 Morphology: LATHS
APPROX COMP AN60*
CLINOPYROXENE ( 40%)
Size(mm): .4-1.2 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 15%)
Size(mm): .2-.4 Morphology: EUHEDRAL-SUBHEDRAL
ALKALI FELDSPAR ( 5%)
Size(mm): .8-1.6 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS
Location: GROUNDMASS Replacing: GLASS
GREEN BROWN*
Leg : 81 Top/Bottom Interval(mm): 1220/1240 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 946.00 Rock Type: IGNEOUS
Core: 97 Sample Midpoint(m) : 948.73 Sect/Pc #: 2/PCE 4
ROCK = DIABASE;
Texture: MEDIUM GRAINED,SUBOPHITIC,GLASSY;
Where sampled: FLOW INTERIOR*
Groundmass - OLIVINE ( 2%)
Size(mm): .1-.3 Morphology: EUHEDRAL
CORRODED,ALT. TO GREEN SMEC + POSSIBLY SERPENTINE;
PLAGIOCLASE ( 42%)
Size(mm): .5-1.2 Morphology: LATHS
FRESH,APPROX COMP AN55;
CLINOPYROXENE ( 35%)
Size(mm): .2-.5 Morphology: SUBHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 3%)
Size(mm): .2 Morphology: EUHEDRAL-SUBHEDRAL
ALKALI FELDSPAR ( 3%)
Size(mm): .8 Morphology: ANHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
INCLUDES YELLOW-GREEN SMEC*
Leg : 81 Top/Bottom Interval(mm): 1030/1060 Describer: Desprairies, A.
Hole: 555 Top of Core Depth(m) : 955.00 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 962.05 Sect/Pc #: 5/PCE 5
ROCK = DIABASE;
Texture: MEDIUM GRAINED,SUBOPHITIC,GLASSY;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .5-1.2 Morphology: LATHS
FRESH,APPROX COMP AN60;
CLINOPYROXENE ( 30%)
Size(mm): .2-.3 Morphology: SUBHEDRAL-ANHEDRAL
FRESH,APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .2 Morphology: EUHEDRAL-SUBHEDRAL
ALKALI FELDSPAR ( 5%)
Size(mm): .8A Morphology: NHEDRAL
APPROX COMP ANORTHOCLASE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS
YELLOW-GREEN*
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