Leg : 92 Top/Bottom Interval(mm): 750/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 55.50 Rock Type: IGNEOUS
Core: 3 Sample Midpoint(m) : 56.25 Sect/Pc #: 1/PCE 5A
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC, INTERSERTAL-OPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 1.5-2.5 Morphology: TABULAR XTLS
CA. 2 PERCENT GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <0.1-1
CLINOPYROXENE ( 40%)
Size(mm): <0.1-1
MAGNETITE ( 3%)
Vesicles -
Size(mm): 1
Percent: <1
Location: RANDOM
Shape: SPHERICAL
FILLING INCLUDES YELLOW-GREEN CLAY+FE.OXIDE+
CALCITE*
Alteration - CARBONATE
Location: VEIN ONLY
CLAYS ( 10%)
Replacing: MAINLY PYX
LOCATED MAINLY IN AREAS OF INTERSTITIAL
CRYPTOXTLINE MATERIAL, YELLOW-GREEN COLOR, YELLOW-
BROWN WHERE OXIDIZED;
ZEOLITE ( 1%)
Location: NEAR VEIN Replacing: INTERSTITIAL
LOW BIREFRINGENCE , CRYPTOXTLINE*
Leg : 92 Top/Bottom Interval(mm): 840/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 55.50 Rock Type: IGNEOUS
Core: 3 Sample Midpoint(m) : 56.34 Sect/Pc #: 1/PCE 5A
ROCK = APHYRIC BASALT;
Texture: SPHERULITIC, INTERSERTAL-INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <0.1-1 Morphology: LATHS, MICROLITES
CLINOPYROXENE ( 35%)
Size(mm): <0.1-0.5
MAGNETITE ( 5%)
Size(mm): <0.2
GLASS ( 10%)
Vesicles -
Size(mm): 0.5-1
Percent: 5
Location: RANDOM
Shape: SPHERICAL
FILLING INCLUDES GREEN CLAY, BROWN CLAY, OXIDE*
Alteration - CLAYS ( 10%)
Location: INTERSTITIAL Replacing: GLASS
Leg : 92 Top/Bottom Interval(mm): 500/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 55.50 Rock Type: IGNEOUS
Core: 3 Sample Midpoint(m) : 57.50 Sect/Pc #: 2/PCE 2B
ROCK = APHYRIC BASALT;
Texture: SUBVARIOLITIC-INTERSERTAL;
Groundmass - PLAGIOCLASE ( 48%)
Size(mm): <0.1-2 Morphology: LATHS, MICROLITES
CLINOPYROXENE ( 35%)
Size(mm): <0.1-1 Morphology: PRISMATIC
MAGNETITE ( 3%)
Size(mm): <0.2 Morphology: SUBHEDRAL
GLASS ( 10%)
OR CRYPTOXTLINE GROUNDMASS*
Vesicles -
Size(mm): 0.5-1
Percent: 1.2
Location: RANDOM
Filling: BROWN CLAY.MIN
Shape: SUB-SPHERES
Alteration - CLAYS ( 10%)
Location: INTERSTITIAL Replacing: GLASS
Leg : 92 Top/Bottom Interval(mm): 270/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 64.50 Rock Type: IGNEOUS
Core: 4 Sample Midpoint(m) : 64.77 Sect/Pc #: 1/PCE 1C
ROCK = PLAG-CPX PHYRIC BASALT;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 1.5-3
MOSTLY FROM GLOMEROCRYSTS;
CLINOPYROXENE ( 2%)
Size(mm): 1.5-2.5
AUGITE, MOSTLY FROM GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 52%)
Size(mm): <0.1-1.5 Morphology: LATHS, SKELETAL
MOSTLY INTERGRANULAR, SPHERULITIC TEXTURE;
CLINOPYROXENE ( 40%)
Size(mm): <0.1-1 Morphology: PRISMATIC GRAINS
MOSTLY INTERGRANULAR, SPHERULITIC TEXTURE;
MAGNETITE ( 5%)
Size(mm): 0.1
Vesicles -
Size(mm): 0.5-1
Percent: <1
Location: RANDOM
Filling: YELLOW-BROWN
Filling: CLAY
Alteration - CLAYS ( 3%)
Location: INTERSTITIAL Replacing: GLASS
Leg : 92 Top/Bottom Interval(mm): 1330/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 64.50 Rock Type: IGNEOUS
Core: 4 Sample Midpoint(m) : 67.33 Sect/Pc #: 2/PCE 2B
ROCK = PLAG SLIGHTLY PHYRIC BASALT;
Texture: OPHITIC, SP VARIOLITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 2-3
PHENOS FORM LARGE GLOMEROCRYST CLUSTERS*
Groundmass - PLAGIOCLASE ( 52%)
Size(mm): 0.1-1.5 Morphology: LATHS, SOME SKELETAL
CLINOPYROXENE ( 40%)
Size(mm): 0.1-2.5 Morphology: LARGER GRAINS, POIKILITIC
MAGNETITE ( 3%)
Size(mm): CA. 0.1 Morphology: INTERSTITIAL, SUBHEDRAL
GLASS ( 5%)
TOTALLY REPLACED*
Alteration - CLAYS ( 5%)
Location: INTERSTITIAL
REPLACING GLASS (OR CRYPTOCRYSTALINE MATERIAL),
BOTTLE GREEN, BROWNISH GREEN WHERE OXIDIZED*
Leg : 92 Top/Bottom Interval(mm): 330/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 64.50 Rock Type: IGNEOUS
Core: 4 Sample Midpoint(m) : 70.83 Sect/Pc #: 5/PCE 4A
ROCK = SP MICROPHYRIC BASALT
GLOMEROPHYRIC (5 PERCENT PLAG CLUSTERS) RATHER
THAN PORPHYRITIC;
Texture: VARIABLE;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <0.1-2 Morphology: LATHS, MICROLITES
CLINOPYROXENE ( 40%)
Size(mm): <0.1-0.5
MAGNETITE ( 5%)
Size(mm): <0.2 Morphology: EUHEDRAL, SUBHEDRAL
GLASS ( 5%)
Morphology: INTERSTITIAL
NONE*
Alteration - COMBINATION ( 5%)
Location: INTERSTITIAL Replacing: GLASS
INCLUDES CLAYS+OXIDES*
Leg : 92 Top/Bottom Interval(mm): 1270/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 73.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 74.77 Sect/Pc #: 1/PCE 18
ROCK = APHYRIC BASALT;
Texture: OPHITIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 52%)
Size(mm): 0.1-2.5 Morphology: LATHS
CLINOPYROXENE ( 40%)
Size(mm): 0.1-2.5
ANHEDRAL GRAINS POIKILITICALLY ENCLOSING PLAG;
MAGNETITE ( 3%)
Morphology: MOSTLY SKELETAL
GLASS ( 5%)
Morphology: INTERSTITIAL
MAY BE CRYPTOXTLINE IN PART*
Vesicles -
Size(mm): 0.5
Percent: <<1
Location: RANDOM
Filling: BROWN CLAY
Shape: SPHERICAL
ONLY ONE FOUND IN SECTION*
Alteration - CLAYS ( 5-10%)
Location: INTERSTITIAL Replacing: GLASS, CRYPTOXTLINE
Replacing: MATERIAL
PALAGONITE, BROWN SMECTITE*
Leg : 92 Top/Bottom Interval(mm): 940/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 82.50 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 83.44 Sect/Pc #: 1/PCE 9
ROCK = SP MICROPHYRIC BASALT
GLOMEROPHYRIC (CONTAINING PLAG+OL+INTERSTITIAL
GLASS) BUT NOT STRICTLY PORPHYRITIC;
Texture: VARIOLITIC-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.1-2 Morphology: SUBHEDRAL, EUHEDRAL
PLAGIOCLASE ( 47%)
Size(mm): <0.1-2 Morphology: MICROLITES, LATHS
CLINOPYROXENE ( 35%)
Size(mm): <0.1-1 Morphology: SUBHEDRAL, PRISMATIC
MAGNETITE ( 3%)
GLASS ( 10%)
Alteration - CLAYS ( 15%)
Replacing: GLASS, OL
INTERSTITIAL (BROWN) AND OL REPLACEMENT (YELLOW)*
Leg : 92 Top/Bottom Interval(mm): 1290/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 91.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 94.29 Sect/Pc #: 2/PCE 4B
ROCK = APHYRIC BASALT;
Texture: SPHERULITIC, INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <0.1-4 Morphology: LATHS, SOME SKELETAL AND
Morphology: PRISMATIC GRAINS
CLINOPYROXENE ( 35%)
Size(mm): <0.1-2 Morphology: EUHEDRAL
MAGNETITE ( 5%)
Morphology: SUBHEDRAL GRAINS, SOME
Morphology: SKELETAL
GLASS ( 10%)
Morphology: INTERSTITIAL
OR CRYPTOCRYSTALLINE MATERIAL*
NONE IN SECTION*
Alteration - CLAYS ( 10%)
Replacing: GLASS, PYX (TR), PLAG (TR)
INTERSTITIAL AND INCIPIENT ALTERATION OF MINERALS,
YELLOW-GREEN OR DARK BROWN (CLAYS AND OXIDE)*
Leg : 92 Top/Bottom Interval(mm): 450/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 100.50 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 102.45 Sect/Pc #: 2/PCE 1B
ROCK = SP MICROPHYRIC BASALT
COULD BE DESCRIBED AS PLAG PHYRIC CONTAINING CA.
35 PERCENT PLAG PHENOS SINCE PLAG HAS AN ALMOST
BIMODAL DISTIBUTION, TREATED AS APHYRIC FOR
CONSISTENCY;
Texture: INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): <0.1-2 Morphology: LATHS, THE SMALLER ONES
Morphology: SOMETIMES SKELETAL
STRONGLY ZONED;
CLINOPYROXENE ( 40%)
Size(mm): <0.1-1 Morphology: PRISMATIC, SUBHEDRAL
MAGNETITE ( 5%)
Size(mm): 0.1-0.5 Morphology: SUBHEDRAL, SOMETIMES SKELETAL
NONE*
NEGLIGIBLE*
Leg : 92 Top/Bottom Interval(mm): 970/ 0 Describer: Pearce, J.A.
Hole: 597C Top of Core Depth(m) : 100.50 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 105.97 Sect/Pc #: 4/PCE 5B
ROCK = APHYRIC BASALT;
Texture: OPHITIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.2-3 Morphology: LATHS
STRONGLY ZONED;
CLINOPYROXENE ( 40%)
Size(mm): 0.2-10 Morphology: ANHEDRAL, POIKILITIC TEX
AUGITE, LARGE XTLS IN POIKILITIC RELATION WITH
FELD;
MAGNETITE ( 5%)
Size(mm): 0.2-1 Morphology: SUBHEDRAL
NONE*
FRESH*
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