Leg : 31 Top/Bottom Interval(mm): 1230/1280 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 118.26 Sect/Pc #: 1/PCE 1
ROCK = PLAG PHYRIC BASALT;
Texture: PHYRIC,VERY FINE-GRAINED,QUENCH,GLASSY*
Phenocrysts- PLAGIOCLASE ( 40%)
Size(mm): .4X.01 Morphology: FELTED,RADIATING FIBERS
BUNCHES OF ACICULAR AND OFTEN HOLLOW XTLS SET
IN FINE-GRAINED(<.001MM)GROUNDMASS OF FEATHERY
BROWN XTLS*
Groundmass - PLAGIOCLASE ( 23%)
PYROXENE ( 35%)
OPAQUE MINERALS ( 2%)
GLASS ( 40%)
GROUNDMASS CONSISTS OF FELTED INTERGROWTH OF PLAG
XTLS IN MATRIX OF GRANULAR PYX AND SPOTTED OPAQUE
XTLS,BETWEEN MICROXTLLINE AREAS ARE BRANCH-TYPE
EXTENSIONS OF BROWNISH GLASS*
Alteration - OTHER
Replacing: GLASS
FINE-GRAINED,LOW BIREFRING. ORANGE MATERIAL*
Vesicles -
Size(mm): .2
FEW VESICLES*
Leg : 31 Top/Bottom Interval(mm): 70/ 100 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 118.59 Sect/Pc #: 2/PCE 1
ROCK = PLAG PHYRIC BASALT;
Texture: PHYRIC,FINE-GRAINED*
Phenocrysts- PLAGIOCLASE ( 35%)
Size(mm): .7X.04 Morphology: ACICULAR,HOLLOW,RADIATING
Morphology: BUNCHES
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .04X.01 Morphology: TABULAR
PYROXENE ( 56%)
Size(mm): .03 Morphology: GRANULAR-SUBHEDRAL
OPAQUE MINERALS ( 4%)
Size(mm): .01-.02 Morphology: EUHEDRAL
GLASS ( 5%)
SMALL PATCHES OF INTERSTITIAL GLASS REMAIN*
Leg : 31 Top/Bottom Interval(mm): 590/ 610 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 119.10 Sect/Pc #: 2/
ROCK = PLAG PHYRIC BASALT;
Texture: PHYRIC,FINE-GRAINED*
Phenocrysts- PLAGIOCLASE ( 35%)
Size(mm): 1.8X.04 Morphology: ACICULAR,HOLLOW
SET AS OVERLAPPING LATHS AND RADIATING FIBERS IN
FINE-GRAINED(.02-.04MM)GROUNDMASS*
Groundmass - PLAGIOCLASE ( 32%)
Size(mm): .005-.01 Morphology: LATH-LIKE
PYROXENE ( 55%)
Size(mm): .005 Morphology: GRANULAR-SUBHEDRAL
PYX XTLS SET IN MAT OF LATH-LIKE PLAG XTLS;
OPAQUE MINERALS ( 8%)
Size(mm): .002-.005 Morphology: EUHEDRAL
SCATTERED;
GLASS ( 5%)
MINOR AMOUNTS OF ALTERED INTERSTITIAL GLASS*
Leg : 31 Top/Bottom Interval(mm): 720/ 750 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 119.24 Sect/Pc #: 2/
ROCK = PLAG PHYRIC BASALT
SAME AS 31-291-5-2-59-61*
Phenocrysts- PLAGIOCLASE
APPROX COMP AN70(LABRADORITE/BYTOWNITE)*
Leg : 31 Top/Bottom Interval(mm): 1150/1170 Describer: Meijer, A.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 119.66 Sect/Pc #: 2/
ROCK = APHYRIC BASALT;
Texture: FINE TO MEDIUM-GRAINED,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.2-0.5 Morphology: ACICULAR,TWINNED
FRESH;
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.5 Morphology: STUBBY XTLS
FRESH;
Alteration - COMBINATION
Location: INTERSTITIAL
INCLUDES CLAY + FE.OX*
Leg : 31 Top/Bottom Interval(mm): 1170/1230 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 119.70 Sect/Pc #: 2/PCE 16
ROCK = BASALT;
Texture: SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): .7X.08 Morphology: TABULAR,LATH-LIKE
PYROXENE ( 37%)
Size(mm): .08 Morphology: GRANULAR
OPAQUE MINERALS ( 3%)
Size(mm): .05 Morphology: EUHEDRAL-SUBHEDRAL
SCATTERED*
Leg : 31 Top/Bottom Interval(mm): 1270/1300 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 119.79 Sect/Pc #: 2/PCE 16
ROCK = BASALT;
Texture: OPHITIC*
Groundmass - PLAGIOCLASE ( 58%)
Size(mm): 1.2X.09 Morphology: ACICULAR,HOLLOW
PYROXENE ( 37%)
Size(mm): .04-.08 Morphology: GRANULAR+FEATHERY ELONGATED
OPAQUE MINERALS ( 5%)
Size(mm): .03 Morphology: EUHEDRAL
SCATTERED*
Alteration - SERPENTINITE
Replacing: PYX
SMALL ROUNDED PATCHES OF SERPENTINIZED MATERIAL -
PROBABLY ALTERATION AFTER PYX*
Leg : 31 Top/Bottom Interval(mm): 1460/1480 Describer: Meijer, A.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 119.97 Sect/Pc #: 2/
ROCK = APHYRIC BASALT
MOST OF SAMPLE BROWN FELTED MASS OF FE.OX AND
FRESH(?) GLASS;
Texture: QUENCH, FINE-GRAINED,SPARSELY
MICROPHYRIC;
Where sampled: CENTER BIT "A"*
Phenocrysts- PLAGIOCLASE
Size(mm): 0.05-0.5
OCCASIONAL MICROPHENOS, FRESH*
Groundmass - CLINOPYROXENE
Size(mm): 0.01-0.02 Morphology: STUBBY XTLS
COMBINATION ( 20%)
Morphology: QUENCH
INCLUDES PLAG + CPX, FRESH;
GLASS
FRESH?*
Alteration - FERROUS OXIDE
CLAY ( 1-2%)
SOME CLAY ALTERATION IN SEVERAL CAVITIES*
Leg : 31 Top/Bottom Interval(mm): 0/ 0 Describer: MacGregor, I.
Hole: 291 Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 120.10 Sect/Pc #: CC/PCE 7
ROCK = PLAG MICROPHYRIC BASALT
MATERIAL FOUND IN CORE BARREL AFTER PIPE HAD
BEEN PULLED;
Texture: MICROPHYRIC,FINE-GRAINED*
Phenocrysts- PLAGIOCLASE
Size(mm): .2X.02 Morphology: TABULAR
MICROPHENOS OF TABULAR PLAG IN FINE-GRAINED(.002-
.005)GROUNDMASS OF FELTED WISPY AND FEATHERY XTLS
BUNDLED TOGETHER IN IRREGULAR SHEAVES,PERCENTAGES
UNDETERMINABLE AS TOO FINE-GRAINED*
Groundmass - OPAQUE MINERALS
SCATTERED;
PLAGIOCLASE
PYROXENE
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