Leg : 74 Top/Bottom Interval(mm): 1320/1350 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 573.60 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 574.94 Sect/Pc #: 1/PCE 1E
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,APHYRIC
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .3X.02 Morphology: THIN LATHS
CLINOPYROXENE ( 45%)
Size(mm): .08X.05 Morphology: SUBHEDRAL
MAGNETITE ( 5%)
Size(mm): .04X.02 Morphology: IRREGULAR
Alteration - CARBONATE ( <1%)
CLAY MINERALS ( <5%)
Replacing: GROUNDMASS
FILLS SOME VESICLES*
Vesicles -
Size(mm): .3-1.5
Percent: 2
Location: SCATTERED
Filling: VOIDS+CLAY
Shape: ROUND
SOME PARTLY FILLED BY FINE GRAINED BASALT*
Leg : 74 Top/Bottom Interval(mm): 810/ 840 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 573.60 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 577.43 Sect/Pc #: 3/PCE 7B
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,APHYRIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .5X.08 Morphology: STUBBY LATHS
CLINOPYROXENE ( 40%)
Size(mm): .2X.2 Morphology: SUBHEDRAL
MAGNETITE ( 5%)
Size(mm): .08X.04 Morphology: SUBHEDRAL
Alteration - CARBONATE ( 1%)
Location: VESICLES
CLAY MINERALS ( 3%)
Replacing: FE.MG
Vesicles -
Size(mm): .1-5
Percent: 1
Location: SCATTERED
Filling: CLAY OR CARB
Shape: ROUND
Leg : 74 Top/Bottom Interval(mm): 720/ 760 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 592.60 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 594.84 Sect/Pc #: 2/PCE 3H
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,APHYRIC,MEDIUM GRAINED;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): .4X.04 Morphology: LATHS
CLINOPYROXENE ( 38%)
Size(mm): .2X.1 Morphology: ANHEDRAL
PLAG AND CPX IN FINE GRAINED SPINIFEX PATCHES;
MAGNETITE ( 2%)
Size(mm): .04X.02 Morphology: ANHEDRAL
Alteration - CARBONATE ( 5%)
Location: VESICLES
CLAY MINERALS ( 2%)
Replacing: FE.MG
Vesicles -
Size(mm): 1-3
Percent: 7
Location: SCATTERED
Filling: CARB
Shape: ROUND
Leg : 74 Top/Bottom Interval(mm): 1280/1330 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 602.10 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 603.41 Sect/Pc #: 1/PCE 5E
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,INTERSERTAL,APHYRIC,MEDIUM-GRAINED;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 58%)
Size(mm): .5X.1 Morphology: STUBBY LATHS
CLINOPYROXENE ( 35%)
Size(mm): .06X.04 Morphology: ANHEDRAL
MAGNETITE ( 2%)
Size(mm): .03X.03 Morphology: ANHEDRAL
ALTERED GLASS ( 5%)
IRREG DISTRIBUTION IN INTERSTICES AND NEAR VESC.*
Alteration - CARBONATE ( 15%)
Location: VESICLES
CLAY MINERALS ( 5%)
Replacing: GLASS,FE.MG
MAGNETITE ( <1%)
Replacing: GLASS
REMINISCENT OF SPINIFEX*
Vesicles -
Size(mm): 1-5
Percent: 15
Location: SCATTERED
Filling: CARB
Shape: OVAL
Leg : 74 Top/Bottom Interval(mm): 940/ 980 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 602.10 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 609.06 Sect/Pc #: 5/
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,APHYRIC,COARSE-GRAINED;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .8X.15 Morphology: LATHS
CLINOPYROXENE ( 43%)
Size(mm): .2X.2 Morphology: SUBHEDRAL
SECTOR ZONING NOTED;
MAGNETITE ( 2%)
Size(mm): .05X.05 Morphology: ANHEDRAL
Alteration - CLAY MINERALS ( 5%)
Location: PATCHES
ORANGE,REPLACING AREAS AROUND VESICLES;
MAGNETITE
ASSOCIATED WITH CLAY.MINS*
Vesicles -
Size(mm): 1-2
Percent: 5
Location: SCATTERED
Filling: EMPTY
Shape: ARCUATE
ORANGE CLAY LINED*
Leg : 74 Top/Bottom Interval(mm): 100/ 140 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 621.10 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 625.72 Sect/Pc #: 4/
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: PLUMOSE,MODERATELY PHYRIC,FINE-GRAINED;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 8%)
Size(mm): 1.5X.2 Morphology: LATHS
CLINOPYROXENE ( <1%)
Size(mm): .3X.3 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 46%)
Size(mm): .1X.01 Morphology: TINY LATHS
CLINOPYROXENE ( 35%)
Morphology: ANHEDRAL
Alteration - CARBONATE ( 1%)
Location: VEIN
Leg : 74 Top/Bottom Interval(mm): 740/ 780 Describer: O'Connell, S.
Hole: 525A Top of Core Depth(m) : 621.10 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 626.36 Sect/Pc #: 4/
ROCK = PLAG-CPX PHYRIC BASALT;
Texture: SUBOPHITIC,PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 27.5%)
Size(mm): .1X.8 Morphology: LATHS,SKELETAL LATHS
CLINOPYROXENE ( 22.5%)
Size(mm): .3X.3 Morphology: SUBHEDRAL-ANHEDRAL
Groundmass - PLAGIOCLASE ( 22%)
DIFFICULT TO DISTINGUISH BETWEEN TYPES;
CLINOPYROXENE ( 22%)
MOSTLY ALTERED;
MAGNETITE ( 5%)
Size(mm): .1-.2
Alteration - CARBONATE ( 3%)
Location: VESICLES
CLAY MINERALS
Location: PHENOS, Replacing: CPX
Location: GROUNDMASS
Vesicles -
Size(mm): .3-1.5
Percent: 2
Filling: CARB
Shape: IRREGULAR
UNEVEN DISTRIBUTION ON T.S. SCALE;
Leg : 74 Top/Bottom Interval(mm): 1020/1080 Describer: O'Connell, S.
Hole: 525A Top of Core Depth(m) : 630.60 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 633.15 Sect/Pc #: 2/PCE 3K
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,APHYRIC,FINE TO MEDIUM GRAINED;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .5X.04 Morphology: LATHS
LOCAL PREFERRED ORIENTATION;
CLINOPYROXENE ( 45%)
Size(mm): .2X.2 Morphology: SUBHEDRAL
Alteration - CARBONATE ( 1%)
Location: VESICLES Replacing: FINE-GRAINED BASALT
CLAY MINERALS ( 30%)
Replacing: CPX
Vesicles -
Size(mm): 3
Percent: 1
Location: SCATTERED
Filling: CARB
Shape: ELONGATE,
Shape: ROUNDED
Leg : 74 Top/Bottom Interval(mm): 1270/1300 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 640.10 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 642.89 Sect/Pc #: 2/PCE 4M
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,INTERSERTAL,APHYRIC,FINE-GRAINED;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2X.02 Morphology: LATHS
CLINOPYROXENE ( 20%)
Size(mm): .04X.04 Morphology: ANHEDRAL
DEVITRIFIED GLASS ( 30%)
Alteration - CLAY MINERALS ( 20%)
Replacing: GLASS
Vesicles -
Size(mm): .5-
Percent: 2 2
Location: 5SCATTERED
Filling: CARB
Shape: ROUND
Leg : 74 Top/Bottom Interval(mm): 40/ 80 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 640.10 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 646.16 Sect/Pc #: 5/
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: SUBOPHITIC,SPARSELY PHYRIC,FINE-GRAINED;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 1.5X1
CLINOPYROXENE ( <<1%)
Size(mm): .2X.2
PLAG+CPX XENOCRYSTS WITH RESORBED MARGINS*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): .3X.04 Morphology: LATHS
CLINOPYROXENE ( 40%)
Size(mm): .02X.02 Morphology: ANHEDRAL
Alteration - CARBONATE ( 2%)
Location: VEINS
Vesicles -
Size(mm): .5
Percent: <1
Location: SCATTERED
Filling: CARB
Shape: ROUND
Leg : 74 Top/Bottom Interval(mm): 100/ 120 Describer: Richardson, S.H.
Hole: 525A Top of Core Depth(m) : 659.10 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 659.21 Sect/Pc #: 1/
ROCK = PLAG-CPX PHYRIC BASALT;
Texture: GLASSY,PHYRIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): .4X.04 Morphology: LATHS
CLINOPYROXENE ( 2%)
Size(mm): .2X.2 Morphology: SUBHEDRAL
PLAG+CPX MICROPHENOS+AUGITE INTERGROWN WITH PLAG
IN GLOMEROPHYRIC INTERGROWTHS*
Groundmass - GLASS ( 88%)
ORANGE-BROWN,LOCALLY DEVITRIFIED*
Alteration - CLAY MINERALS ( 15%)
Location: VESICLES
Vesicles -
Size(mm): 1-5
Percent: 20
Location: SCATTERED
Filling: CLAY
Shape: ROUND
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