Leg : 6 Top/Bottom Interval(mm): 250/ 290 Describer: Melson, W.
Hole: 54 Top of Core Depth(m) : 292.90 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 293.17 Sect/Pc #: 1/PCE 4
ROCK = ALTERED BASALT
HYDROTHERMALLY ALTERED,SLIGHTLY BRECCIATED,SOURCE
IS IR;
Texture: SUBOPHITIC
ORIGINAL TEXTURE,GRAIN SIZE AND MINERALOGY
OBSCURED BUT VERY SIMILAR TO 54-9-1-8;
Where sampled: FRAGMENTS OF PILLOW LAVA*
Groundmass - PLAGIOCLASE ( 44%)
PYROXENE ( 26%)
OTHER ( 28%)
OTHER GROUNDMASS AND ALTERATION PRODUCTS;
OLIVINE ( 0%)
NONE NOTED;
OXIDES ( 2%)
SPINEL ( TR%)
CHROMIAN;
PERCENTAGES DETERMINED BY MODAL ANALYSES*
Alteration - CALCITE ( 4%)
Location: FRACTURES
MORE ALTERED THAN 54-9-1-8*
Leg : 6 Top/Bottom Interval(mm): 450/ 550 Describer: Melson, W.
Hole: 54 Top of Core Depth(m) : 292.90 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 293.40 Sect/Pc #: 1/PCE 8
ROCK = BASALT
SOURCE IS IR;
Texture: SUBOPHITIC
WITH IRREGULARLY SHAPED PATCHES OF ALTERED
GROUNDMASS,SCATTERED OL GRANULES,SPARSE AREAS
COMPOSED MAINLY OF OL AND PLAG WITH MINOR PYX.
GRAIN SIZE AND TEXTURE TYPICAL OF PILLOW LAVAS.
Where sampled: FRAGMENTS OF PILLOW LAVA*
Phenocrysts- COMBINATION
Size(mm): TO 1.5
INCLUDES OL+PLAG MICROPHENOS*
Groundmass - PLAGIOCLASE ( 52%)
Size(mm): .7X.1 Morphology: LATHS
MAX.LENGTH 1MM;
PYROXENE ( 28%)
AUGITE IS TINGED LIGHT REDDISH-BROWN SUGGESTING A
MODERATELY HIGH TITANIUM CONTENT;
OTHER ( 8%)
OTHER GROUNDMASS AND ALTERATION PRODUCTS;
OLIVINE ( 8%)
OXIDES ( 4%)
SPINEL ( TR%)
CHROMIAN;
PERCENTAGES OBTAINED BY MODAL ANALYSES*
Alteration - SMECTITE
MOST ABUNDANT ALTERATION MINERAL IS BROWNISH-
ORANGE MICACEOUS MINERAL WITH HIGH BIREFRINGENCE,
PROBABLY A SMECTITE GROUP MINERAL*
Vesicles -
Percent: 1
Filling: MICACEOUS MINS,
Filling: CARB
SECONDARY MICACEOUS MINERALS,SOME
MINOR CARB,VESICLES ARE RARE*
RARE*
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