Leg : 17 Top/Bottom Interval(mm): 1020/ Describer: Bass, M.
Hole: 164 Top of Core Depth(m) : 256.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 257.02 Sect/Pc #: 1/
ROCK = PLAG-OL MOD PHYRIC BASALT
SOURCE IS IR;
Texture: PHYRIC,MICROPHYRIC*
Phenocrysts- PLAGIOCLASE ( 3.9%)
Size(mm): 0.45X0.36
PLAGIOCLASE ( 2.7%)
Size(mm): 0.25X0.03
OLIVINE
Size(mm): 0.25X0.17 Morphology: PSEUDOMORPHS
PYROXENE ( 0%)
Groundmass - GROUNDMASS ( 87.4%)
INCLUDES SMALL OPAQUE GRAINS;
OPAQUE MINERALS ( 2.8%)
Size(mm): 0.006
PYROXENE
Alteration - KFELDSPAR
Replacing: PLAG
MONTMORILLONITE
Replacing: PLAG
Vesicles -
Percent: 1.4
Filling: MONT,CELAD
DIMENSIONS 0.003/0.63X0.55;
Percent: 0.2
Filling: CALCITE,CELAD
DIMENSION 0.27/0.8X0.55,MINOR CELAD*
Leg : 17 Top/Bottom Interval(mm): 1240/ 0 Describer: Moberly, R.
Hole: 164 Top of Core Depth(m) : 256.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 257.24 Sect/Pc #: 1/
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PHYRIC*
Phenocrysts- PLAGIOCLASE
Size(mm): TO 1. Morphology: 6EUHEDRAL
RANGE DOWN TO MICROLITES.NOW COMMONLY RIMMED AND
PARTLY REPLACED BY K-FELDSPAR AND PARTLY REPLACED
BY CLAY;
OLIVINE
Size(mm): TO 1. Morphology: 2
AND CHLOROPHAEITE*
Groundmass - MESOSTASIS
NOW CHLORITE,OPAQUES AND FELDSPAR;
OPAQUE MINERALS
Size(mm): .002-.005 Morphology: EUHEDRAL
ABUNDANT;
FELDSPAR
Size(mm): .01 Morphology: MICROLITES
Alteration - CALCITE
Location: VEINLETS,
Location: CAVITIES
MONTMORILLONITE
Location: CAVITIES
Vesicles -
Filling: MONT,CALCITE
IRREGULAR CAVITIES LINED WITH GREEN MONT AND
FILLED WITH CALCITE OR,LESS COMMONLY,WITH
MONTMORILLONITE,SOME LATER(JOINT)VEINLETS OF
CALCITE ONLY*
Leg : 17 Top/Bottom Interval(mm): 870/ Describer: Bass, M.
Hole: 164 Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 265.87 Sect/Pc #: 1/
ROCK = PLAG-OL PHYRIC BASALT
SOURCE IS IR;
Texture: PHYRIC,MICROPHYRIC,CHILLED*
Phenocrysts- PLAGIOCLASE ( 5.9%)
Size(mm): 0.9X0.5
INCLUDES MONT ALTERATION;
PLAGIOCLASE ( 21.6%)
Size(mm): 0.4X0.05
OLIVINE ( 3.4%)
Size(mm): 0.5 X0.3 Morphology: PSEUDOMORPHS
PHENOS AND MICROPHENOS*
Groundmass - PLAGIOCLASE ( 2.9%)
PYROXENE ( 38.7%)
Morphology: SKELETAL,EQUANT
RARELY MICROPHENOS;
OPAQUE MINERALS
Morphology: EQUANT,ELONGATE
Alteration - MONTMORILLONITE
Location: GROUNDMASS
CALCITE
Replacing: PLAG
KFELDSPAR
Location: CORES Replacing: PLAG
MONTMORILLONITE ( 15.4%)
Location: CORES, Replacing: PLAG
Location: GROUNDMASS
SIDERITE ( RARE%)
Location: GROUNDMASS
ID UNCERTAIN,BROWN*
Vesicles -
Size(mm): 0.6
Percent: 0.7
Filling: MONT
Size(mm): 0.2
Filling: CALCITE
Leg : 17 Top/Bottom Interval(mm): 1160/ Describer: Bass, M.
Hole: 164 Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 267.66 Sect/Pc #: 2/
ROCK = PLAG-OL PHYRIC BASALT
SOURCE IS IR, SIMILAR TO OVERLYING ROCKS;
Texture: PHYRIC*
Phenocrysts- OLIVINE
EARLY OL COMPLETELY ALTERED;
PLAGIOCLASE
EARLY PLAG MAY BE SELECTIVELY ALTERED ALONG A ZONE
JUST INSIDE THE RIM OR ALONG TWIN PLANES TO GRAY
GREEN MONT OR CALCITE OR BOTH*
Groundmass - GLASS
ALTERED*
Alteration - MONTMORILLONITE
Replacing: PLAG
CALCITE
Replacing: PLAG
Leg : 17 Top/Bottom Interval(mm): 1370/ Describer: Bass, M.
Hole: 164 Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 273.87 Sect/Pc #: 6/
ROCK = PLAG-OL PHYRIC BASALT
SOURCE IS IR;
Texture: PHYRIC,VARIOLITIC,COARSE-GRAINED GROUNDMASS;
Where sampled: FLOW OR PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 6.7%)
Size(mm): 0.55X0.23
INCLUDES MONT ALTERATION;
PLAGIOCLASE ( 21.1%)
Size(mm): 0.3X 0.013
OLIVINE ( 2.4%)
Size(mm): 0.4X0.35 Morphology: PSEUDOMORPHS
Groundmass - COMBINATION ( 60.3%)
INCLUDES PYX + MONT + PLAG;
PLAGIOCLASE ( 3.7%)
OPAQUE MINERALS ( 5.5%)
Morphology: EQUANT, ELONGATE
OPAQUE MINERALS ( 0.1%)
IN OL PSEUDOMORPHS;
PYROXENE
Morphology: PARALLEL PRISMS
Alteration - KFELDSPAR ( 0.1%)
Replacing: PLAG PHENOS
MONTMORILLONITE
Replacing: OL
GREEN OR BROWNISH GREEN BUT RED OR BROWN LOCALLY
AS NEAR VEINS;
CELADONITE
Vesicles -
Percent: 0.03
Filling: MONT
Percent: 0.2
Filling: CALCITE
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