Leg : 31 Top/Bottom Interval(mm): 1430/1480 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 567.00 Rock Type: SEDIMENTARY
Core: 53 Sample Midpoint(m) : 568.46 Sect/Pc #: 1/
ROCK = VOLCANIC TUFF*
Phenocrysts- PLAGIOCLASE
APPROX COMP AN52,AN51-TWO MEASUREMENTS ON PHENOS*
Groundmass - CLINOPYROXENE
PLAGIOCLASE
OTHER
VOLCANIC FLOW FRAGMENTS+VOLCANIC TUFF FRAGMENTS+
HYPABYSSAL XENOLITH;
ORTHOPYROXENE
MATRIX (10-15%)
MINOR-MOSTLY VERY FINE GLASS FRAGMENTS+FRACTURED
XTLS.ROCK SHOWS CLOSED FRAMEWORK,MAX. CLAST SIZE
1CM,AVE. APPROX 2-3MM*
Leg : 31 Top/Bottom Interval(mm): 1320/1340 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 624.00 Rock Type: SEDIMENTARY
Core: 54 Sample Midpoint(m) : 625.33 Sect/Pc #: 1/
ROCK = TUFF*
Groundmass - GLASS ( 5%)
FRESH GLASS FRAGMENTS WITH PHENOS;
PUMICE ( 40%)
FRAGMENTS;
OTHER ( 5%)
PORPHYRITIC BASALT;
PLAGIOCLASE ( 20%)
PYROXENE ( 5%)
WITH ABUNDANT HYPERSTHENE;
OXIDES ( 2%)
MATRIX ( 27%)
MATRIX OF GLASS;
AMPHIBOLE ( TR%)
Leg : 31 Top/Bottom Interval(mm): 1350/1380 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 624.00 Rock Type: SEDIMENTARY
Core: 54 Sample Midpoint(m) : 625.37 Sect/Pc #: 1/
ROCK = TUFF*
Phenocrysts- OTHER
PHENOCRYSTIC BASALTS-PHENOS OF PLAG,PYX+OXIDES-
GLASSY MATRIX;
Groundmass - PUMICE
AMPHIBOLE
TRACHYTIC(MICRO) AMPHIBOLE ANDESITE;
GLASS
FRESH,WITH COARSE PLAG PHENOS;
OTHER
PLAG/HYPERSTHENE/OXIDE GLOMEROCRYSTS+PLAG+PYX+
OXIDE MINERAL FRAGMENTS;
MATRIX
ALL CONSTITUENTS IN ALTERED GLASSY SPHERULITIC
MATRIX*
Leg : 31 Top/Bottom Interval(mm): 10/ 40 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 624.00 Rock Type: SEDIMENTARY
Core: 54 Sample Midpoint(m) : 625.53 Sect/Pc #: 2/
ROCK = TUFF
FRAGMENTS OF PORPHYRITIC BASALT,GROUNDMASS
CRYPTOXTLLINE TO GLASSY*
Phenocrysts- OTHER
GLOMEROPORPHYRITIC AGGREGATES OF PLAG+PYX+OP.MINS*
Groundmass - PUMICE
PLAGIOCLASE
SOME REMELTING IN ZONES;
PYROXENE
AMPHIBOLE
OXIDES
MATRIX
ALL CONSTITUENTS IN MATRIX OF BROWNISH DEVT.GLASS*
Leg : 31 Top/Bottom Interval(mm): 350/ 410 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 624.00 Rock Type: SEDIMENTARY
Core: 54 Sample Midpoint(m) : 625.88 Sect/Pc #: 2/
ROCK = TUFF
FRAGMENTS OF PORPHYRITIC BASALT*
Groundmass - PUMICE
PLAGIOCLASE
PYROXENE
HYPERSTHENE+CPX;
OXIDES
MATRIX
MATRIX OF PALAGONITIZED GLASS*
Leg : 31 Top/Bottom Interval(mm): 980/1030 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 624.00 Rock Type: SEDIMENTARY
Core: 54 Sample Midpoint(m) : 626.51 Sect/Pc #: 2/
ROCK = TUFF
PORPHYRITIC BASALTS*
Phenocrysts- OTHER
PHENOS OF PLAG+PYX(HYPERSTHENE+CPX)+HBL+OXIDES,
MATRIX MICROXTLLINE+GLASSY*
Groundmass - PUMICE
FRAGMENTS;
GLASS
SPHEROIDAL;
OTHER
PLAG+PYX+AMPH+OXIDE FRAGMENTS;
MATRIX
ALL CONSTITUENTS IN ALTERED GLASSY MATRIX*
Leg : 31 Top/Bottom Interval(mm): 220/ 280 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 624.00 Rock Type: SEDIMENTARY
Core: 54 Sample Midpoint(m) : 627.25 Sect/Pc #: 3/
ROCK = TUFF*
Phenocrysts- OTHER
PORPHYRITIC,PORPHYRITIC BASALT FRAGMENTS, 15%
LITHICS - PUMICE + PORPHYRITIC BASALT*
Groundmass - PUMICE ( 15%)
PERCENTAGE IS FOR PUMICE+PORPHYRITIC BASALT-I.E.,
LITHICS;
PLAGIOCLASE ( 40%)
PYROXENE ( 10%)
OPX+CPX;
OXIDES ( 30%)
MATRIX
ALL CONSTITUENTS IN MATRIX OF FINE-GRAINED DEVT.
GLASS(PALAGONITE)*
Leg : 31 Top/Bottom Interval(mm): 1140/1160 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 652.50 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 653.65 Sect/Pc #: 1/
ROCK = HORNBLENDE ANDESITE*
Phenocrysts- PLAGIOCLASE
AMPHIBOLE
PLAG AND AMPHIBOLE PHENOS OR GLOMEROPHENOS*
Groundmass - MATRIX
FINE FELTED TO GLASSY MATRIX NOW LARGELY ALTERED
AND DEVITRIFIED*
Leg : 31 Top/Bottom Interval(mm): 1350/1370 Describer: Meijer, A.
Hole: 296 Top of Core Depth(m) : 652.50 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 653.86 Sect/Pc #: 1/
ROCK = OPX-AUGITE ANDESITE;
Texture: MEDIUM-GRAINED,PORPHYRITIC,PILOTAXITIC*
Phenocrysts- PLAGIOCLASE (15-20%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL
COMMONLY SHOW SIEVE TEXTURE,COMPLEX ZONING,
INCLUSIONS OF GLASS & MINOR PYX, FRESH;
AUGITE ( 6-8%)
Size(mm): 0.05-0.1 Morphology: EUHEDRAL
CONTAIN MANY FINE-GRAINED INCLUSIONS ESPECIALLY
ALONG RIMS, OCCASIONALLY TWINNED;
ORTHOPYROXENE ( 5-6%)
Morphology: EUHEDRAL
MICROPHENOS, CONTAIN SMALL INCLUSIONS,FRESH;
OLIVINE ( TR%)
ONLY MESH TEXTURE AND OUTLINE PRESERVED*
Groundmass - FE-TI OXIDE ( 1-2%)
Size(mm): 0.01-0.02
PLAGIOCLASE ( 30%)
Morphology: LATHS
FINE-GRAINED,FRESH;
CLINOPYROXENE ( 6-7%)
ORTHOPYROXENE ( 2-3%)
FE-TI OXIDE ( 1-2%)
GLASS ( 30%)
FRESH, LIGHT BROWN*
Vesicles -
Percent: 0
Leg : 31 Top/Bottom Interval(mm): 1350/1390 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 652.50 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 653.87 Sect/Pc #: 1/
ROCK = PYROXENE ANDESITE*
Phenocrysts- PLAGIOCLASE ( 35%)
APPROX COMP AN48,FULL OF OPAQUE INCLUSIONS;
PYROXENE ( 5%)
PHENOS AND GLOMEROPORPHYRITIC AGGREGATES OF PLAG+
PYX;
OXIDES ( 10%)
Morphology: EUHEDRAL
Groundmass - MATRIX
FINE-GRAINED MATRIX OF MICROTRACHYTIC FELDSPARS IN
FINE GRANULAR GROUNDMASS*
Leg : 31 Top/Bottom Interval(mm): 670/ 730 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 691.20 Sect/Pc #: 1/PCE B
ROCK = LAPILLI TUFF;
Groundmass - OTHER
FRAGMENTS OF PORPHYRITIC BASALT;
OTHER
VESICULAR PORPHYRITIC BASALT;
OTHER
GLASSY BASALT;
PLAGIOCLASE
PYROXENE
OXIDES
MATRIX
GLOMEROPHYRIC AGGREGATES(PLAG,PYX,OPAQUES) IN
A MATRIX OF BROWNISH DEVITRIFIED GLASS;
Alteration - AMPHIBOLE
Leg : 31 Top/Bottom Interval(mm): 670/ 731 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 691.20 Sect/Pc #: 1/PCE A
ROCK = BASALT FRAGMENTS
LITHIC VOLCANIC FRAGMENTS OF GLASSY AND
PORPHYRITIC BASALT;
Groundmass - PLAGIOCLASE
PYROXENE
OXIDES
MATRIX
PLAG+PYX+OXIDE+CRYSTAL AGGREGATE FRAGMENTS IN
BROWN DEVITRIFIED AND PALAGONITIZED GLASS MATRIX*
Leg : 31 Top/Bottom Interval(mm): 790/ 810 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 691.30 Sect/Pc #: 1/
ROCK = ASH TUFF*
Phenocrysts- OTHER
GLASSY PORPHYRITIC BASALT FRAGMENTS*
Groundmass - PLAGIOCLASE
PYROXENE
OXIDES
MATRIX
PLAG+PYX+OXIDE FRAGMENTS IN DEVITRIFIED GLASSY
MATRIX*
Leg : 31 Top/Bottom Interval(mm): 1410/1430 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 691.92 Sect/Pc #: 1/
ROCK = ASH TUFF*
Groundmass - OTHER
LITHIC FRAGMENTS OF PORPHYRITIC BASALT WITH MATRIX
OF GLASSY,VARIOLITIC AND A FEW INTERSERTAL XTLS;
PUMICE
SOME PUMICE FRAGMENTS
PLAGIOCLASE
PYROXENE
OXIDES
MATRIX
PLAG+PYX+OXIDE FRAGMENTS IN MATRIX OF SPHERULITIC
PALAGONITIZED GLASS*
Leg : 31 Top/Bottom Interval(mm): 460/ 470 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 692.47 Sect/Pc #: 2/
ROCK = LAPILLI TUFF*
Groundmass - OTHER
LITHIC FRAGMENTS OF GLASSY,VARIOLITIC AND
PORPHYRITIC BASALTS;
PLAGIOCLASE
PYROXENE
OXIDES
MATRIX
PLAG+PYX+OXIDE FRAGMENTS IN MATRIX OF A BROWNISH
SPHERULITIC DEVITRIFIED GLASS,BOUNDARIES TO MANY
FRAGMENTS OFTEN DIFFUSE-SUGGESTING REMELTING BY
MATRIX OR HYDRATION OF GLASS-DESTROYING
BOUNDARIES*
Leg : 31 Top/Bottom Interval(mm): 1360/1380 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 693.37 Sect/Pc #: 2/
ROCK = LAPILLI TUFF*
Phenocrysts- PLAGIOCLASE
PYROXENE
PYX POSSIBLY A HYPERSTHENE ANDESITE,PLAG AND PYX
PHENOS ARE IN PORPHYRITIC BASALT*
Groundmass - OTHER
LITHIC FRAGMENTS OF PORPHYRITIC BASALT IN
HYALOPILITIC MATRIX,MINOR VARIOLITIC AND GLASSY
BASALT;
PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
PLAG+PYX+OPAQUE FRAGMENTS IN GROUNDMASS OF
PALAGONITIZED ASH*
Leg : 31 Top/Bottom Interval(mm): 200/ 210 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 693.71 Sect/Pc #: 3/
ROCK = GRADED ASH-LAPILLI COARSE TUFF*
Groundmass - OTHER
LITHIC VOLCANIC FRAGMENTS OF GLASSY AND
PORPHYRITIC BASALTS;
PLAGIOCLASE
PYROXENE
OXIDES
AMPHIBOLE
GLASS
PLAG+PYX+OXIDES+A FEW AMPHIBOLE FRAGMENTS IN
GROUNDMASS OF BROWN DEVITRIFIED GLASS*
Leg : 31 Top/Bottom Interval(mm): 290/ 300 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 693.80 Sect/Pc #: 3/
ROCK = ASH TUFF
WELL SORTED*
Groundmass - OTHER ( 30%)
LITHIC FRAGMENTS OF SUBOPHITIC TO VARIOLITIC AND
HYALOPILITIC BASALTS;
PLAGIOCLASE ( 26%)
PYROXENE ( 4%)
OPAQUE MINERALS ( 2%)
GLASS ( 40%)
FRAGMENTS OF PLAG+PYX+OP.MINS IN GROUNDMASS OF
DEVITRIFIED BROWN GLASS*
Leg : 31 Top/Bottom Interval(mm): 970/1000 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 695.99 Sect/Pc #: 4/PCE 10
ROCK = LAPILLI TUFF
POOR SORTING,ANGULAR;
Phenocrysts- PLAGIOCLASE
HYPERSTHENE
OPAQUE MINERALS
PHENOS ARE IN PORPHYRITIC BASALT AND OFTEN
ACCUMULATED INTO GLOMEROPORPHYRITIC AGGREGATES
(LOOKS LIKE A HYPERSTHENE ANDESITE)*
Groundmass - OTHER ( 40%)
LITHIC FRAGMENTS PREDOMINANTLY OF PORPHYRITIC
BASALT AND A FEW VARIOLITIC TEXTURES;
PLAGIOCLASE ( 20%)
PYROXENE ( 10%)
OPAQUE MINERALS ( 5%)
GLASS ( 25%)
GROUNDMASS OF BROWN GLASS NOW PARTIALLY
PALAGONIZED*
Leg : 31 Top/Bottom Interval(mm): 100/ 130 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 690.50 Rock Type: SEDIMENTARY
Core: 56 Sample Midpoint(m) : 698.12 Sect/Pc #: 6/PCE 1
ROCK = ASH TUFF
WELL SORTED;
Groundmass - OTHER ( 15%)
LITHIC FRAGMENTS OF GLASSY BASALTS,PUMICE AND
VARIOLITIC BASALTS;
PLAGIOCLASE ( 25%)
PYROXENE ( 3%)
AMPHIBOLE ( 1%)
OXIDES ( 2%)
GLASS ( 54%)
GLASS MATRIX PARTIALLY ALTERED TO PALAGONITE,MANY
GLASSY SPHERES IN MATRIX,ALSO A FEW FORAMS*
Alteration - PALAGONITE
Replacing: GLASS
Leg : 31 Top/Bottom Interval(mm): 320/ 370 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 747.50 Rock Type: SEDIMENTARY
Core: 58 Sample Midpoint(m) : 749.35 Sect/Pc #: 2/PCE 3
ROCK = VOLCANIC SANDSTONE/SILTSTONE;
Groundmass - SAND
SAND OF PLAG+PYX+BLACK GLASS IN MATRIX OF CLAY+
PALAGONITE+SILT TO CLAY SIZED MINERALS;
SILT
SILTY CLAY-PLAG+OCCASIONAL PYX IN PALAGONITE-CLAY
MATRIX*
Leg : 31 Top/Bottom Interval(mm): 160/ 200 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 747.50 Rock Type: SEDIMENTARY
Core: 58 Sample Midpoint(m) : 750.68 Sect/Pc #: 3/PCE 2
ROCK = VOLCANIC SANDSTONE/SILTSTONE
FAIRLY WELL SORTED;
ANGULAR TO SUBANGULAR FRAGMENTS;
Groundmass - GLASS ( 35%)
PLAGIOCLASE ( 30%)
PYROXENE ( 5%)
AMPHIBOLE ( 5%)
OPAQUE MINERALS ( 5%)
MATRIX ( 20%)
CLAY SIZED MATRIX,MOST FRAGMENTS OF SILT SIZE,
LAYERING RESULTS FROM CHANGE OF GRAIN SIZE,CLAY
SIZED PORTIONS HAVE SLIGHTLY GREATER ABUNDANCE OF
GLASS*
Leg : 31 Top/Bottom Interval(mm): 600/ 630 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 785.50 Rock Type: SEDIMENTARY
Core: 59 Sample Midpoint(m) : 786.12 Sect/Pc #: 1/PCE 6
ROCK = VOLCANIC SILTSTONE
ANGULAR SHAPES BUT FAIRLY WELL SORTED;
Groundmass - OTHER
A FEW LARGE LITHIC VOLCANIC FRAGMENTS;
OPAQUE MINERALS
MINOR OPAQUE PHASES SCATTERED THROUGH SLIDE;
OTHER
SILT SIZED FRAGMENTS OF GLASS+FRESH PLAG+SMALL
LITHIC FRAGMENTS*
Leg : 31 Top/Bottom Interval(mm): 670/ 730 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 785.50 Rock Type: SEDIMENTARY
Core: 59 Sample Midpoint(m) : 786.20 Sect/Pc #: 1/PCE 4
ROCK = VOLCANIC SILTSTONE
ANGULAR FRAGMENTS BUT FAIRLY WELL SORTED;
Groundmass - OTHER
SILT SIZED MIXTURE OF GLASS+MICROLITHIC VOLCANIC
FRAGMENTS+PLAG+AMPH+OXIDES;
CLAY MINERALS ( 15%)
Leg : 31 Top/Bottom Interval(mm): 1180/1240 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 966.00 Rock Type: SEDIMENTARY
Core: 63 Sample Midpoint(m) : 967.21 Sect/Pc #: 1/PCE 8
ROCK = VOLCANIC SILTSTONE
FRAGMENTED;
Groundmass - PUMICE ( 40%)
FRESH GLASS;
GLASS ( 10%)
FRESH;
OTHER ( 5%)
PORPHYRITIC BASALT;
PLAGIOCLASE ( 10%)
GLASS OFTEN ADHERING,SOME REMELTING;
PYROXENE ( 5%)
OPAQUE MINERALS ( 2%)
MATRIX ( 28%)
MATRIX OF GLASS+SMALL PUMICE FRAGMENTS-ALSO VERY
FINE CLAY SIZED PARTICLES(PROBABLY CLAY MINERALS)*
Leg : 31 Top/Bottom Interval(mm): 1300/1340 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 966.00 Rock Type: SEDIMENTARY
Core: 63 Sample Midpoint(m) : 971.82 Sect/Pc #: 4/PCE 19
ROCK = LAPILLI TUFF
FRAGMENTED;
Groundmass - PUMICE ( 25%)
OTHER ( 5%)
PORPHYRITIC BASALT;
OTHER ( 10%)
VARIOLITIC BASALT;
PLAGIOCLASE ( 25%)
OTHER ( 3%)
PYX+OXIDES;
GLASS ( 30%)
DEVITRIFIED OR PALAGONIZED GLASS MATRIX*
Alteration - SERPENTINITE ( 2%)
SERPENTINIZED FRAGMENTS*
Leg : 31 Top/Bottom Interval(mm): 980/1070 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1071.53 Sect/Pc #: 1/PCE 4
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER
SILTY CLAY-MINERAL+VOLCANOGENIC SILT SIZED
FRAGMENTS,SMALL SAND LAYER AT TOP*
Leg : 31 Top/Bottom Interval(mm): 0/ 0 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1072.00 Sect/Pc #: 2/PCE 7
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER
SAND SIZED ANGULAR FAIRLY WELL SORTED FRAGMENTS-
GLASSY TO MICROXTLLINE BASALT AND PUMICE+PLAG+PYX+
OP.MINS;
MATRIX
MATRIX UP TO 40% MORE ABUNDANT THAN USUAL,
CRYPTOXTLLINE WITH FAINT GREENISH BROWN OR GREEN
COLOR-IN PATCHES GREEN LOOKS LIKE SERPENTINE,CLAY
MINERALS MIXED IN WITH MATRIX*
Leg : 31 Top/Bottom Interval(mm): 150/ 190 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1072.17 Sect/Pc #: 2/PCE 3
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER ( 70%)
INCLUDES PUMICE(80% OF FRAGMENTS,.4-2MM)+GLASS+
GLASSY AND MICROCRYSTALLINE BASALTS+PLAG+PYX(CPX+
HYPERSTHENE);
MATRIX ( 30%)
CLAY MATERIAL*
Leg : 31 Top/Bottom Interval(mm): 200/ 240 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1072.22 Sect/Pc #: 2/PCE 3
ROCK = LAPILLI TUFF
FRAGMENTED;
Groundmass - GLASS ( 10%)
PUMICE ( 10%)
OTHER ( 1%)
MICROXTLLINE BASALT;
OTHER ( 5%)
PORPHYRITIC BASALT;
PLAGIOCLASE ( 25%)
PYROXENE ( 10%)
OXIDES ( 5%)
MATRIX ( 34%)
BROWNISH DEVITRIFIED GLASS*
Leg : 31 Top/Bottom Interval(mm): 910/ 950 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1072.93 Sect/Pc #: 2/PCE 11
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER
SANDY LAYER-PLAG(20%)+PYX(15%)+SMALL CONCENTRATION
OF OXIDES NEAR BASE(10%)+SERPENTINE CLASTS(10%)+
VOLCANIC LITHIC FRAGMENTS(20%)IN A MATRIX(25%)OF
CLAY MATERIAL,FRAGMENTS WELL SORTED,ANGULAR TO
SUBANGULAR,SOME ROUNDED;
OTHER
SILT(20%)/CLAY(80%) LAYER-PLAG(20%)+LITHIC
FRAGMENTS(10%)PRIMARILY,GROUNDMASS(70%)MOSTLY
DEVITRIFIED GLASS-NOW CLAY+PALAGONITE*
Leg : 31 Top/Bottom Interval(mm): 1450/1530 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1073.49 Sect/Pc #: 2/PCE 18
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER ( 80%)
2 TYPES CLASTS- COARSE & FINE.COARSE:.8-4MM WITH
FRAGMENTS 80%/MATRIX 20%,FINE ARE .3-.8MM WITH
SUBROUNDED STRUCTURE WITH FRAGMENTS 75%/MATRIX
25%.CONSIST OF PUMICE(80% OF CLASTS)+BROWN GLASS
+PLAG+PYX+EPIDOTE;
MATRIX ( 20%)
CLAY MATERIAL*
Leg : 31 Top/Bottom Interval(mm): 440/ 490 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1073.97 Sect/Pc #: 3/PCE 6
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
SAME AS 64-3-136-142-18*
Leg : 31 Top/Bottom Interval(mm): 1360/1420 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1074.89 Sect/Pc #: 3/PCE 18
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER ( 80%)
Size(mm): 1-4
CLASTS POORLY SORTED,ANGULAR(MATRIX OF HIGHLY
ALTERED BASALT),CONSISTS OF PUMICE(80% OF
FRAGMENTS)+ GLASSY BASALT+PLAG+PYX+GLOMEROPHYRIC
AGGREGATES;
MATRIX ( 20%)
CLAY+SERPENTINE*
Leg : 31 Top/Bottom Interval(mm): 830/ 940 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1075.89 Sect/Pc #: 4/PCE 10B
ROCK = LAPILLI TUFF
FRAGMENTED;
Groundmass - OTHER
PORPHYRITIC BASALT;
PUMICE
OTHER
GLASSY BASALTS;
OTHER
CHLORITIZED(OR SERPENTINIZED?) BASALT;
PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
GLASS
MATRIX OF PALAGONITIZED GLASS(MINOR CLAY)*
Alteration - CHLORITE
Replacing: BASALT
SERPENTINITE
Replacing: BASALT
SERPENTIZATION UNCERTAIN*
Leg : 31 Top/Bottom Interval(mm): 1080/1150 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1076.12 Sect/Pc #: 4/PCE 12
ROCK = VOLCANIC SILTSTONE/SANDSTONE;
Groundmass - OTHER ( 80%)
VOLCANIC CLASTS (VERY FINE-GRAINED, ANGULAR,
POORLY SORTED-.2-1.6MM)+PLAG+PYX(CPX+HYPERSTHENE);
MATRIX ( 20%)
CLAY+SERPENTINE*
Leg : 31 Top/Bottom Interval(mm): 1440/1470 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1076.46 Sect/Pc #: 4/
ROCK = VOLCANIC SILTSTONE/SANDSTONE*
Groundmass - OTHER ( 40%)
Size(mm): .05-.1
CONSIST OF PUMICE+GLASS+MICROXTLLINE BASALT+PLAG;
MATRIX ( 60%)
CLAY+SERPENTINE,VERY FINE GRAINED*
Leg : 31 Top/Bottom Interval(mm): 0/ 0 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1070.50 Rock Type: SEDIMENTARY
Core: 64 Sample Midpoint(m) : 1076.60 Sect/Pc #: CC/
ROCK = LAPILLI TUFF
FRAGMENTED*
Groundmass - OTHER ( 25%)
PORPHYRITIC BASALT;
OTHER ( 15%)
GLASSY BASALT;
PUMICE ( 20%)
PLAGIOCLASE ( 10%)
PYROXENE ( 5%)
OPAQUE MINERALS ( 5%)
MATRIX ( 25%)
PALAGONITIZED BASALT,SOME GLASS AND GLASSY BASALT
ALTERED TO SERPENTINE-LIKE MINERAL*
Alteration - PALAGONITE
Replacing: BASALT
SERPENTINITE
Replacing: GLASS+GLASSY BASALT
SERPENTINE-LIKE MINERAL*
Leg : 31 Top/Bottom Interval(mm): 160/ 220 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1080.00 Rock Type: SEDIMENTARY
Core: 65 Sample Midpoint(m) : 1080.19 Sect/Pc #: 1/PCE 4
ROCK = VOLCANIC SILTSTONE;
Groundmass - OTHER ( 60%)
Size(mm): .4-2
POORLY SORTED,ANGULAR,BASALT MATRIX IS ALTERED.
CONSISTS OF VESICULAR BASALT+GLASSY BASALTS+
SPHERULITIC BASALT+PLAG+PYX;
MATRIX ( 40%)
FINE-GRAINED CLAY,PALAGONITE AND SERPENTINE.
ZEOLITE FILLING VUGS*
Leg : 31 Top/Bottom Interval(mm): 1070/1120 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1080.00 Rock Type: SEDIMENTARY
Core: 65 Sample Midpoint(m) : 1082.60 Sect/Pc #: 2/PCE 10
ROCK = VOLCANIC SILTSTONE;
Groundmass - OTHER ( 75%)
Size(mm): .8-3
ANGULAR,POORLY SORTED,CONSISTS OF SPHERULITIC
BASALT+GLOMEROPORPHYRITIC AGGREGATES+PORPHYRITIC
BASALTS+GLASSY BASALTS+PUMICE+VESICULAR BASALTS+
PLAG+PYX+OP.MINS+AMPH;
MATRIX ( 25%)
MATRIX OF PALAGONITIZED AND SERPENTIZED GLASS
(GLASS IN LITHIC FRAGMENTS NOW MORE HIGHLY ALTERED
TO SERPENTINICIOUS PRODUCT),ALSO CONTAINS MORE
CLAY MINERALS,ZEOLITES IN VUGS IN MATRIX*
Leg : 31 Top/Bottom Interval(mm): 1130/1180 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1080.00 Rock Type: SEDIMENTARY
Core: 65 Sample Midpoint(m) : 1082.66 Sect/Pc #: 2/PCE 10
ROCK = VOLCANIC SILTSTONE;
TWO LAYERS-COARSE AND FINE GRAINED, COARSE:
CONSISTS OF FRAGMENTS(45%)-VESICULAR BASALT+
PORPHYRITIC BASALT(.4-2MM,POORLY SORTED,ANGULAR)+
PLAG+PYX+GLASS+AMPH,AND MATRIX(55%)-PALAGONITIC TO
SERPENTINICIOUS MATERIAL MIXED WITH MINERAL
FRAGMENTS,ZEOLITES IN VUGS;
FINE:
ANGULAR TO SUBANGULAR FRAGMENTS(80%,.1-.15MM)OF
WELL SORTED GRAINS OF SAME MATERIAL AS IN COARSE
LAYER(LITHICS+MINERAL FRAGMENTS),MATRIX(20%)IS
SAME AS COARSE MATRIX,SAND*
Leg : 31 Top/Bottom Interval(mm): 1480/1500 Describer: MacGregor, I.
Hole: 296 Top of Core Depth(m) : 1080.00 Rock Type: SEDIMENTARY
Core: 65 Sample Midpoint(m) : 1082.99 Sect/Pc #: 2/
ROCK = VOLCANIC SILTSTONE*
Groundmass - OTHER ( 30%)
Size(mm): .8-2
ANGULAR,MODERATELY WELL SORTED,CONSISTS OF PLAG+
PYX(SOME WITH MELTED PORTIONS)+AMPH+SPHERULITIC
BASALT+GLOMEROPORPHYRITIC AGGREGATES+VESICULAR
BASALT+PORPHYRITIC BASALT;
MATRIX ( 70%)
FINE GRAINED PALAGONITE+CLAY MINERALS+NANNOFOSSILS
+FORAMS+SMALL MINERAL FRAGMENTS,PROBABLY ALSO RICH
IN ZEOLITES,SMALL VUGS FILLED WITH ZEOLITES*
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