Leg : 60 Top/Bottom Interval(mm): 760/ 780 Describer: Sharaskin, A.
Hole: 456A Top of Core Depth(m) : 114.50 Rock Type: METAMORPHIC
Core: 11 Sample Midpoint(m) : 115.27 Sect/Pc #: 1/PCE 11
ROCK = PLAG SPARSELY PHYRIC BASALT
ALL COMPONENTS OF GROUNDMASS ARE ALMOST TOTALLY
ALTERED,OBSERVER CALLED THIS A METABASALT;
Texture: ORIGINALLY SPARSELY PHYRIC,SPHERULITIC*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): TO 1 Morphology: ROUNDED
APPROX COMP UNCERTAIN*
Alteration - COMBINATION ( 94%)
Location: THROUGHOUT Replacing: EVERYTHING BUT PLAG PHENOS
INCLUDES CARB + CLAY.MINS + QUARTZ + PYRITE +
ALBITE + ZEOLITES,ID OF LAST TWO UNCERTAIN*
Vesicles -
Size(mm): 0.5-5
Percent: 5
Location: SCATTERED
Filling: QUARTZ,CLAY,
Shape: ROUND TO
Filling: CARB
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 110/ 130 Describer: Sharaskin, A.
Hole: 456A Top of Core Depth(m) : 123.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 123.62 Sect/Pc #: 1/PCE 2
ROCK = PLAG PHYRIC BASALT
MODERATELY ALTERED,THOLEIITIC;
Texture: PORPHYRITIC;
Where sampled: SEPARATE PIECE*
Phenocrysts- PLAGIOCLASE ( 19%)
Size(mm): 1-8 Morphology: EUHEDRAL
APPROX COMP AN70-75;
OLIVINE ( 1%)
Size(mm): 3.5 Morphology: PSEUDOMORPHS
SINGLE TALC+SERPENTINE+BRUCITE PSEUDOMORPHS;
APPROX COMP UNCERTAIN*
Groundmass - CHLORITE ( 56%)
PLAGIOCLASE ( 12%)
Size(mm): 0.05-0.4 Morphology: LATHS AND MICROLITHS
APPROX COMP UNCERTAIN;
CLINOPYROXENE ( 12%)
Size(mm): 0.05-0.15 Morphology: LATHS AND MICROLITHS
PYX MOSTLY AND INTERSTITIAL MATERIAL TOTALLY
CONVERTED INTO SECONDARY CHLORITE AGGREGATES;
MAGNETITE ( 1%)
Size(mm): <0.01 Morphology: DUSTLIKE
Alteration - TALC
Location: PSEUDOMORPHS Replacing: OLIVINE
HEMATITE
Location: PSEUDOMORPHS Replacing: OLIVINE
SERPENTINITE
Location: PSEUDOMORPHS Replacing: OLIVINE
ZEOLITE
Location: GROUNDMASS Replacing: PYX,INTERSTITIAL MATERIAL
CHLORITE
Location: GROUNDMASS Replacing: PYX,INTERSTITIAL MATERIAL
Vesicles -
Size(mm): TO 0.3
Percent: 2
Location: SCATTERED
Filling: CHLORITE,SMEC
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 690/ 700 Describer: Sharaskin, A.
Hole: 456A Top of Core Depth(m) : 123.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 124.20 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC;
Where sampled: SEPARATE PIECE*
Groundmass - PLAGIOCLASE ( 38%)
Size(mm): 0.05-0.25
APPROX COMP AN60-65;
CLINOPYROXENE ( 24%)
Size(mm): 0.01-0.15
GLASS ( 4%)
DEVITRIFIED,PARTIALLY ALTERED TO PALAGONITE;
OLIVINE ( 3%)
Size(mm): 0.03-0.1
MAGNETITE ( 1%)
Size(mm): <0.01
Alteration - PALAGONITE ( 5%)
Location: INTERSTITIAL Replacing: GLASSY MATERIAL
Location: PART OF
Location: GROUNDMASS
Vesicles -
Size(mm): 1-4
Location: SCATTERED
Filling: EMPTY
Shape: ROUND
Size(mm): 0.1-0.5
Location: SCATTERED
Filling: SOME SMEC OR
Shape: IRREGULAR
Filling: PALAG
TWO GROUPS OF VESICLES COMPRISE 30% OF ROCK*
Leg : 60 Top/Bottom Interval(mm): 120/ 130 Describer: Sharaskin, A.
Hole: 456A Top of Core Depth(m) : 142.50 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 142.63 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT;
Texture: SPARSELY MICROPHYRIC,SUBOPHITIC TO INTERSERTAL;
Phenocrysts- PLAGIOCLASE ( .08%)
Size(mm): 0.1-0.6
CLINOPYROXENE ( .02%)
Size(mm): 0.1-0.5
Groundmass - PLAGIOCLASE ( 31%)
Size(mm): 0.1-0.3
CLINOPYROXENE ( 23%)
Size(mm): 0.01-0.2
GLASS ( 23%)
MAGNETITE ( 2%)
Size(mm): <0.01
Alteration - SMECTITE ( 4%)
Location: GROUNDMASS Replacing: GLASSY MATERIAL
PALAGONITE ( 1%)
Location: GROUNDMASS Replacing: GLASSY MATERIAL
Vesicles -
Size(mm): 1.5-2.0
Percent: 15
Location: SCATTERED
Filling: EMPTY
Shape: ROUND
Size(mm): 0.3-0.8
Percent: 5
Location: SCATTERED
Filling: EMPTY
Shape: IRREGULAR
TWO GROUPS OF VESICLES*
Leg : 60 Top/Bottom Interval(mm): 380/ 410 Describer: Sharaskin, A.
Hole: 456A Top of Core Depth(m) : 142.50 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 142.89 Sect/Pc #: 1/PCE 6
ROCK = APHYRIC BASALT;
Texture: VERY SPARSELY MICROPHYRIC*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): TO 1 Morphology: TABULAR,EUHEDRAL
APPROX COMP AN60-70,WEAK NORMAL ZONATIONS,
AGGREGATES*
Groundmass - PLAGIOCLASE ( 46%)
Size(mm): 0.1-0.4 Morphology: ELONGATE
APPROX COMP AN60;
CLINOPYROXENE ( 33%)
Size(mm): 0.03-0.2
GLASS ( 9%)
DEVITRIFIED,ALTERED;
MAGNETITE ( 3%)
OLIVINE ( <1%)
Size(mm): 0.05
OL IDENTITY UNCERTAIN*
Alteration - COMBINATION ( 15%)
Location: VESICLES AND Replacing: GLASSY MATERIAL AND PARTLY
Location: GROUNDMASS Replacing: PYROXENES
INCLUDES SMEC + PALAG + FE-OXIDES*
Vesicles -
Size(mm): 0.1-3
Percent: 7
Location: SCATTERED
Filling: SMEC,PALAG
Shape: ROUND TO
Shape: IRREGULAR
FILLING UP TO 50-60%*
Leg : 60 Top/Bottom Interval(mm): 270/ 300 Describer: Sharaskin, A.
Hole: 456A Top of Core Depth(m) : 152.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 152.29 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT
SLIGHT TO MODERATE ALTERATION THROUGHOUT;
Texture: APHYRIC,INTERSERTAL TO SUBOPHITIC,SPHERULITIC
BECOMES SPHERULITIC NEAR LARGE PIPE-SHAPED
VESICLES*
Groundmass - PLAGIOCLASE ( 41%)
Size(mm): TO 0.5
APPROX COMP AN65;
CLINOPYROXENE ( 36%)
Size(mm): TO 0.2
GLASS ( 9%)
DEVITRIFIED;
MAGNETITE ( 3%)
Morphology: DUSTLIKE
OLIVINE ( 1%)
Size(mm): 0.02-0.07
Alteration - SMECTITE ( 3%)
Location: PATCHES,SMALL Replacing: INTERSTITIAL MATERIAL
Location: IRREGULAR
Location: ZONES,SMALL
Location: VESICLES
Vesicles -
Size(mm): 20-25
Percent: 5
Filling: EMPTY
Shape: IRREGULAR,
Shape: ELONGATE
LARGE VESICLES ARE ORIENTED AND WORM OR PIPELIKE;
Size(mm): 0.1-0.5
Percent: 5
Location: SCATTERED
Filling: SMEC
Shape: ROUNDED
MICROVESICLES*
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