Leg : 54 Top/Bottom Interval(mm): 270/ 290 Describer: Dmitriev, Y.
Hole: 423 Top of Core Depth(m) : 32.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 38.48 Sect/Pc #: CC/PCE 3
ROCK = PLAG-CPX MOD MICROPHYRIC BASALT
ROCK'S STRUCTURE SHOWS INTERMITTENT BANDS OF
LESS AND MORE CRYSTALLIZED MATERIAL, BAND
THICKNESS RANGES FROM 1.8 TO 12MM,BOUNDARIES ARE
DISTINCT BUT NOT SHARP;
Texture: MICROPORPHYRIC,GROUNDMASS-MICROLITIC*
Phenocrysts- PLAGIOCLASE ( 3.9%)
Size(mm): 2.2X0.05
CLINOPYROXENE ( 2.7%)
Size(mm): 0.1
PLAG+CPX ARE MOSTLY GLOMEROPHYRIC AGGREGATES*
Groundmass - PLAGIOCLASE
Size(mm): 0.1X0.01 Morphology: MICROLITES
MICROLITES ARE ALIGNED PARALLEL TO BANDING;
COMBINATION ( 93.4%)
INCLUDES PLAG+CPX+ILMENITE+MAGN, INCIPIENT CPX
XTLS;
GLASS
DEVITRIFIED*
Alteration - CLAY MINERALS
Location: INTERSPACES Replacing: VOLCANIC GLASS
Vesicles -
Size(mm): 0.1
Filling: SMEC,PYRITE
Shape: ROUND
Leg : 54 Top/Bottom Interval(mm): 400/ 420 Describer: Dmitriev, Y.
Hole: 423 Top of Core Depth(m) : 32.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 38.61 Sect/Pc #: CC/PCE 4
ROCK = PLAG-CPX-OL MOD PHYRIC BASALT;
Texture: MICROPORPHYRIC,GROUNDMASS- MICROLITIC*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.2
PLAGIOCLASE ( 1.5%)
Size(mm): 0.1X0.8 Morphology: LATHS,TABULAR XTLS
CLINOPYROXENE ( 1.5%)
Size(mm): 0.2 Morphology: TABULAR GRAINS
PLAG+CPX ARE GLOMEROPORPHYRIC AGGREGATES*
Groundmass - COMBINATION ( 96.6%)
INCLUDES PLAG+CPX+MAGN+ILMENITE+GLASS;
PLAGIOCLASE
Morphology: MICROLITHIC,LATHS
SOME LATHS FORKED,DIMENSIONS 0.02X0.2MM;
CLINOPYROXENE
Morphology: NEEDLES,SHEAF-LIKE AGGREGATES
MAGNETITE
Morphology: EQUIDIMENSIONAL,GRANULAR
EVENLY DISTRIBUTED;
GLASS
DEVITRIFIED WITH SHEAF-LIKE AGGREGATES OF PYX AND
TINY EXSOLUTION OF OP.MINS,INTERGROWN WITH PLAG*
Vesicles -
Size(mm): 0.1
Percent: 0.4
Filling: SMEC
Shape: ROUND
Leg : 54 Top/Bottom Interval(mm): 280/ 340 Describer: Dmitriev, Y.
Hole: 423 Top of Core Depth(m) : 42.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 42.31 Sect/Pc #: 1/PCE 5
ROCK = PLAG-CPX MOD PHYRIC BASALT
ROCK'S STRUCTURE WAS DESCRIBED AS STRIPED OR
BANDED DUE TO INTERCALATION OF BANDS WHICH ARE
A)DARKER,LESS DEVITRIFIED TO VENOLITIC TEXTURE OR,
B)LATHS,WITH INCIPIENT PYX AND PLAG MICROLITES
WITH SUBPARALLEL ORIENTATION,BAND WIDTH IS
APPROX 0.1MM, ROCK IS RATHER FRESH;
Texture: VITROPHYRIC TO PILOTAXITIC*
Phenocrysts- PLAGIOCLASE ( 2.9%)
Morphology: LATHS
DIMENSIONS 0.15X0.5;
CLINOPYROXENE ( 0.6%)
Size(mm): 0.15 Morphology: ISOMETRIC GRAINS
PLAG+CPX OFTEN OCCUR AS GLOMEROPHYRIC AGGREGATES*
Groundmass - PLAGIOCLASE ( 2.9%)
Morphology: LATHS
DIMENSIONS 0.15X0.5;
GLASS ( 96%)
PERCENTAGES OBTAINED BY POINT COUNTS*
Vesicles -
Size(mm): 0.1
Percent: 0.3
Filling: SMEC
Shape: ROUND
Leg : 54 Top/Bottom Interval(mm): 470/ 480 Describer: Dmitriev, Y.
Hole: 423 Top of Core Depth(m) : 46.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 46.98 Sect/Pc #: 1/PCE 7
ROCK = PLAG-CPX SPARSELY MICROPHYRIC BASALT
ROCK HAS BANDS OF 1 TO 10MM IN WIDTH,BANDS CONSIST
OF MORE AND THEN LESS DISTINCTLY CRYSTALLINE
MATERIAL,DARKER LESS XTLLINE MATTER IS VARIOLITIC,
LIGHTER MORE XTLLINE BAND IS PILOTAXITIC DUE TO
SUBPARALLEL PLAG MICROLITES;
Texture: VARIOLITIC-PILOTAXITIC*
Phenocrysts- PLAGIOCLASE ( 1.1%)
CLINOPYROXENE ( 0.6%)
PLAG+CPX ARE GLOMEROPHYRIC AGGREGATES*
Groundmass - COMBINATION ( 98.5%)
INCLUDES PLAG+CPX+MAGN+ILMENITE+GLASS;
PLAGIOCLASE
Size(mm): 0.1X0.04 Morphology: MICROLITIC
MAGNETITE ( .004%)
CLINOPYROXENE
INCIPIENT XSTLS,PERCENTAGES OBTAINED BY POINT
COUNTS*
Vesicles -
Size(mm): 0.1
Filling: SMEC
Shape: ROUND
Leg : 54 Top/Bottom Interval(mm): 40/ 80 Describer: Dmitriev, Y.
Hole: 423 Top of Core Depth(m) : 51.50 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 51.56 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT;
Texture: VITROPHYRIC-VARIOLITIC*
Phenocrysts- PLAGIOCLASE
CLINOPYROXENE
GLOMEROPHYRIC AGGREGATES OF PLAG AND CPX*
Groundmass - PLAGIOCLASE ( 2.3%)
Morphology: MICROLITES
DIMENSIONS 0.03X0.3;
CLINOPYROXENE ( 0.9%)
Size(mm): 0.03 Morphology: EQUIDIMENSIONAL GRAINS
GLASS ( 96.4%)
PARTIALLY DEVITRIFIED;
GROUNDMASS CONTAINS 3 ZONES,A) LIGHT YELLOW GLASS
WITH BROWN GLOBULES OF DEVITRIFIED GLASS WITH
OCCASSIONAL XTLS OF PLAG+CPX INSIDE,
B)INTERMEDIATE ZONE,
C)DARK BROWN GLASS WITH MICROLITES OF PLAG+CPX,
PERCENTAGES OBTAINED BY POINT COUNTS*
Vesicles -
Size(mm): 0.1
Percent: 0.4
Leg : 54 Top/Bottom Interval(mm): 420/ 490 Describer: Dmitriev, Y.
Hole: 423 Top of Core Depth(m) : 51.50 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 51.96 Sect/Pc #: 1/PCE 6
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2 Morphology: TABULAR XTLS
Groundmass - PLAGIOCLASE ( 27.8%)
Morphology: MICROLITES
DIMENSION 0.02X0.3MM;
CLINOPYROXENE ( 32.8%)
Size(mm): 0.01X0.2 Morphology: EQUIDIMENSIONAL,SHEAF-LIKE
COMBINATION ( 39.1%)
INCLUDES MAGN+ILMENITE+GLASS;
MAGNETITE ( .01%)
Morphology: SKELETAL
GLASS
DEVITRIFIED,PATCHY;
OLIVINE ( 0%)
Alteration - CLAY MINERALS
Location: INTERSPACES Replacing: VOLCANIC GLASS
Vesicles -
Size(mm): 0.1
Percent: 0.3
Filling: SMECTITE
Shape: ROUND
Filling: CHLOROPHAEITE
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