Leg : 26 Top/Bottom Interval(mm): 0/ 0 Describer: DSDP microfilm
Hole: 254 Top of Core Depth(m) : 276.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 276.00 Sect/Pc #: 1/
ROCK = PLAG-PYX PHYRIC BASALT
UNCERTAIN ABOUT SAMPLE DEPTH - SUBBOTTOM
DEPTH IS 277.5;
Texture: VERY COARSE, OPHITIC,PLAG-PYX PHYRIC*
Phenocrysts- PLAGIOCLASE ( 43%)
Size(mm): TO 1.8 Morphology: LATHS
OPHITICALLY ENCLOSED IN PYX;
PYROXENE ( 25%)
Size(mm): TO 1.2
LARGE, NEUTRAL-COLORED WITH 2V GAMMA CA
45-50 DEGREES, AMOUNTS ARE TOTAL PLAG AND
PYX IN SECTION*
Groundmass - FERROUS OXIDE ( 3%)
MOST OF THE FE ORE INDISTINGUISHABLE FROM
GLASSY AREAS,BUT SOME ILMENITE;
GLASS ( 25%)
PALAGONITIC,VERY DK GREEN,OCCUPIES
INTERSTITIAL SPACES BETWEEN OPHITIC AREAS,
GRADING INTO CAVITIES FILLED WITH RADIAL
ILMENITE
Size(mm): TO 0.5 Morphology: BARS,GRAINS
FIBERS OF THE SAME GREEN MATERIAL;
Alteration - CALCITE
Location: INTERSTITIAL
Vesicles -
Percent: 0
Leg : 26 Top/Bottom Interval(mm): 0/ 0 Describer: DSDP microfilm
Hole: 254 Top of Core Depth(m) : 276.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 276.00 Sect/Pc #: 1/
ROCK = BASALT
SIMILAR TO 31-1 EXCEPT FOR PRESENCE OF OL
PSEUDOMORPHS,UNCERTAIN ABOUT SAMPLE LOCATION,
SUBBOTTOM DEPTH IS 318.8;
Texture: OPHITIC,PLAG-PYX PHYRIC*
Phenocrysts- PLAGIOCLASE ( 31%)
AMOUNT IS TOTAL PLAG IN SECTION;
PYROXENE ( 35%)
AMOUNT IS TOTAL PYX IN SECTION;
Groundmass - OLIVINE ( 2%)
Size(mm): 0.5
COMPLETELY IDDINGSITIZED XTLS;
FERROUS OXIDE ( 2%)
GLASS ( 30%)
Alteration - CALCITE ( 4%)
Vesicles -
Percent: 0
Leg : 26 Top/Bottom Interval(mm): 600/ 0 Describer: DSDP microfilm
Hole: 254 Top of Core Depth(m) : 315.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 315.60 Sect/Pc #: 1/
ROCK = AMYGDALOIDAL OLIVINE BASALT
SUBBOTTOM DEPTH IS 315.6M;
Texture: PLAG-OL PHYRIC,HYALOPHITIC*
Phenocrysts- OLIVINE ( 10%)
Size(mm): TO 0.5
ALSO MANY SMALLER XTLS,LARGE OLIVINES ALTERED
TO WELL-DEVELOPED PLEOCHROIC GREENISH-
BROWN IDDINGS,HIGHLY BIREFRINGENT,AND SHOWING
THE CHARACTERISTIC LAMELLAR STRUCTURE,
AMOUNT IS TOTAL OL IN SECTION;
PLAGIOCLASE ( 45%)
Morphology: LATHS
LATHS OF SODIC LABRADORITE,SLIGHTLY
SAUSSURITIZED,AMOUNT IS TOTAL PLAG;
IN SECTION*
Groundmass - PYROXENE ( 17%)
Morphology: GRAINS
RAGGED, NEUTRAL-COLORED;
GLASS ( 20%)
Morphology: INTERSTITIAL
FERROUS OXIDE
Alteration - BOWLINGITE
Location: VESICLES
ID UNCERTAIN FOR BOWLINGITE;
CHLORITE
Location: VESICLES
CALCITE
Location: VESICLES
Vesicles -
Percent: 8
Filling: BWLGITE,
Filling: CALCITE,
Filling: CHLORITE
FILLED WITH GREEN SPHERULITIC ?BWLGITE OR
CHLORITE OR CALCITE, SOME HAVE BOTH, IN WHICH
CASE THE CALCITE ALWAYS OCCUPIES THE CENTER*
Leg : 26 Top/Bottom Interval(mm): 950/ 970 Describer: Kempe, D.
Hole: 254 Top of Core Depth(m) : 315.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 318.96 Sect/Pc #: 3/
ROCK = BASALT
HIGHLY ALTERED;
Texture: HYALO-OPHITIC*
Groundmass - OLIVINE
Size(mm): 0.5
RARE;
PYROXENE
Size(mm): 1.2
PLAGIOCLASE
Size(mm): 1.8
APPROX COMP AN68*
Leg : 26 Top/Bottom Interval(mm): 550/ 0 Describer: DSDP microfilm
Hole: 254 Top of Core Depth(m) : 334.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 334.55 Sect/Pc #: 1/
ROCK = AUTOBRECCIATED OL BASALT
SUBBOTTOM DEPTH IS GIVEN AS 334.6M BUT AM
UNCERTAIN ABOUT SAMPLE LABEL - COULD BE
335.1 M,SHOWS FLOW BANDING AND
SWIRLING IN THIN SECTION;
Texture: FINE-GRAINED, OL PHYRIC*
Phenocrysts- OLIVINE ( 20%)
Size(mm): TO 0.5
MANY SMALL SHAPELESS ONES AND A FEW LARGER
XTLS, TOTALLY ALTERED TO DEEP-RED IDDINGS,
LARGER XTLS ARE LIGHTER COLORED, LAMELLAR,
AND BIREFRINGENT*
Groundmass - GROUNDMASS
GRANULAR, CONTAINING PLAG LATHS,PYX AND
ILMENITE RODS, ALL REACHING A MAX OF 0.1MM,
AND SOME GLASS;
PLAGIOCLASE
Morphology: LATHS
PYROXENE
ILMENITE
Morphology: RODS
Alteration - FERROUS OXIDE ( 72%)
Vesicles -
Percent: 8
Filling: BWLGITE,
Shape: IRREGULAR
Filling: CHLORITE
GREENISH CHLORITE OR BOWLINGITE*
Leg : 26 Top/Bottom Interval(mm): 1100/ 0 Describer: DSDP microfilm
Hole: 254 Top of Core Depth(m) : 334.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 335.10 Sect/Pc #: 1/
ROCK = AUTOBRECCIATED BASALT
SUBBOTTOM DEPTH IS 335.1M, UNCERTAIN ABOUT
SAMPLE LABEL - COULD BE 334.6M*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 17%)
Morphology: LATHS
PYROXENE ( 30%)
Morphology: GRAINS,GRAIN STRINGS
WELL-SHAPED;
ILMENITE
Size(mm): TO 1 Morphology: BARS
FERROUS OXIDE ( 18%)
GLASS ( 35%)
Alteration - CHLORITE
Location: STRINGERS
BOWLINGITE
Location: STRINGERS
GROUNDMASS CUT BY GREEN STRINGERS, LINKED TO
THE CAVITIES,FILLED WITH CHLORITE OR BWLGITE*
Leg : 26 Top/Bottom Interval(mm): 1150/1170 Describer: Kempe, D.
Hole: 254 Top of Core Depth(m) : 334.00 Rock Type: SEDIMENTARY
Core: 38 Sample Midpoint(m) : 335.16 Sect/Pc #: 1/
ROCK = ALTERED BASALT (SMECTITE)
TOTALLY ALTERED;
Texture: "NON-IGNEOUS"*
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