Leg : 60 Top/Bottom Interval(mm): 90/ 130 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 256.50 Rock Type: IGNEOUS Core: 28 Sample Midpoint(m) : 256.61 Sect/Pc #: 1/PCE 2 ROCK = HIGH MG BRONZITE ANDESITE; Texture: HYALOPILITIC; Where sampled: NEXT TO GLASSY MARGIN Phenocrysts- CLINOPYROXENE ( 6%) Size(mm): 0.1-1.0 Morphology: EUHEDRAL,STUBBY UNALTERED MICROPHENOCRYSTS; ORTHOPYROXENE ( 1%) Size(mm): 0.1-1.0 INTERGROWN WITHIN THE CPX XTLS* Groundmass - GLASS ( 43%) QUENCHED TO GLASS,PYX + ORE + PLAG, R.I. OF GLASS LEQ BALSAM; CLINOPYROXENE ( 10%) Size(mm): 0.004-0.1 Morphology: STUBBY TO EUHEDRAL UNALTERED* Alteration - CLAY MINERALS ( 10%) Location: AROUND Replacing: GLASS Location: VESICLES PERCENT LISTED AS PART OF GLASS; ZEOLITE ( 1%) Location: VESICLES Replacing: PLAG IN PART ZEOL FILLS VESICLE IN SLIDE* Vesicles - Size(mm): 0.5-2.0 Percent: 40 Location: DISPERSED Filling: ZEOLITES Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 640/ 670 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 256.50 Rock Type: IGNEOUS Core: 28 Sample Midpoint(m) : 257.16 Sect/Pc #: 1/PCE 9 ROCK = HIGH MG BRONZITE ANDESITE; Texture: HYALOPILITIC-INTERSERTAL* Phenocrysts- CLINOPYROXENE ( 2%) Size(mm): 0.2-0.5 Morphology: PRISMATIC TO EUHEDRAL SOME STRAIN SHADOWS,REGULAR AND CASTELATE (SIC) TWINNING* Groundmass - GLASS ( 28%) QUENCH TEXTURE,CPX + PLAG + BROWN GLASS,NO FE-TI OXIDES; CLINOPYROXENE ( 20%) Size(mm): 0.02-0.2 Morphology: PRISMATIC TO SKELETAL Alteration - CLAY MINERALS ( 7-8%) Location: LINING Replacing: GLASS Location: VESICLES Vesicles - Size(mm): 0.5-1.0 Percent: 50 Location: DISPERSED Filling: SOME CLAYS Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 1110/1140 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 256.50 Rock Type: IGNEOUS Core: 28 Sample Midpoint(m) : 257.63 Sect/Pc #: 1/PCE 14 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL TO VARIOLITIC OR SPHERULITIC* Phenocrysts- CLINOPYROXENE ( 4%) Size(mm): 0.5-1.0 SOME PHENOS HAVE IRREGULAR BLOCKY TWINNING,SOME PHENOS DO NOT GO EXTINCT,MOST ARE RIDDLED WITH INCLUSION PITS; ORTHOPYROXENE ( 1%) Size(mm): 0.5-0.8 RIMMED WITH CPX* Groundmass - CLINOPYROXENE ( 19%) Size(mm): 0.1-1 Morphology: BLOCKY TO PRISMATIC PLAGIOCLASE ( 10%) Size(mm): 0.1-1 Morphology: SKELETAL PARTLY ALTERED TO ZEOLITE(?),ALSO INCLUDES GLASS; GLASS ( 12%) DEVITRIFIED TO FRESH-PALE BROWN; MAGNETITE ( 1%) Alteration - CLAY MINERALS ( 3%) Location: INTERSTITIAL Replacing: GLASS ZEOLITE ( 3%) Location: LINING Location: VESICLES Vesicles - Percent: 50 Leg : 60 Top/Bottom Interval(mm): 1300/1330 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 256.50 Rock Type: IGNEOUS Core: 28 Sample Midpoint(m) : 257.82 Sect/Pc #: 1/PCE 16 ROCK = HIGH MG BRONZITE ANDESITE; Texture: QUENCH OR SPHERULITIC* Phenocrysts- CLINOPYROXENE ( 5%) Size(mm): 0.2-0.6 Morphology: BLOCKY TO PRISMATIC INCLUDES SOME OPX RIMMED BY CPX-<1%* Groundmass - GLASS ( 30%) BROWN,DEVITRIFIED; PLAGIOCLASE ( 10%) Size(mm): 0.1-1.0 Morphology: SKELETAL TO ACICULAR PLAG IS FIBROUS SPHERULITIC; CLINOPYROXENE ( 7%) Size(mm): 0.01-0.2 Morphology: CHUNKY TO PRISMATIC MAGNETITE ( 2%) Size(mm): 0.01-0.02 OXIDIZED IN PART* Alteration - CLAY MINERALS ( 10%) Location: LINE VESICLES Replacing: GLASS Location: AND ALONG Location: FRACTURES INCIPIENT,RADIAL PHILLIPSITE IN ALTERED ZONE; HEMATITE ( 2%) Location: EXTERIOR Location: SURFACE Vesicles - Size(mm): 0.2-0.5 Percent: 45 Location: NEAREST GLASS Filling: LINED WITH CLAY Shape: IRREGULAR SOME ABOUT 1MM,ONE TEAR-DROP SHAPED* Leg : 60 Top/Bottom Interval(mm): 1420/1460 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 256.50 Rock Type: IGNEOUS Core: 28 Sample Midpoint(m) : 257.94 Sect/Pc #: 1/PCE 18 ROCK = HIGH MG BRONZITE ANDESITE; Texture: HYALOPILITIC* Phenocrysts- CLINOPYROXENE ( 10%) Size(mm): 0.2-1.0 Morphology: TABULAR TO ANHEDRAL SOME INTERPENETRATION TWINS; ORTHOPYROXENE ( 2%) Size(mm): 0.2-1.0 Morphology: TABULAR RIMMED BY CPX* Groundmass - GLASS ( 38%) CLINOPYROXENE ( 35%) Size(mm): 0.05-0.3 Morphology: EUHEDRAL TO PRISMATIC FLOW TEXTURED; ORTHOPYROXENE ( 3%) Size(mm): 0.05-0.2 Morphology: EUHEDRAL TO PRISMATIC PLAGIOCLASE ( 2%) Alteration - CLAY MINERALS ( 2%) Location: LINE VESICLES Vesicles - Size(mm): 0.2-2.0 Percent: 10 Location: RANDOM Filling: CLAY.MINS Shape: ROUND TO Shape: IRREGULAR IRREGULAR SHAPE IN VARIOLITES* Leg : 60 Top/Bottom Interval(mm): 10/ 30 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 266.00 Rock Type: IGNEOUS Core: 29 Sample Midpoint(m) : 266.02 Sect/Pc #: 1/PCE 1 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL TO HYALOPILITIC THINNER PORTIONS ARE HYALOPILITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- CLINOPYROXENE ( 4%) Size(mm): 0.1-1.0 Morphology: EUHEDRAL TO TABULAR ORTHOPYROXENE ( 1%) Size(mm): 0.1-1.0 Morphology: TABULAR Groundmass - CLINOPYROXENE ( 30%) Size(mm): 0.02-0.1 Morphology: EUHEDRAL-ACICULAR-TABULAR CHRISTMAS TREE FORMS; GLASS ( 25%) CLEAR TO BROWN WITH VAPOR INCLUSIONS(?)* Alteration - CLAY MINERALS ( 5%) Location: EXTERIOR Replacing: GLASS Location: SURFACE AND Location: LINE VESICLES ZEOLITE ( 1%) Location: GROUNDMASS Replacing: GLASS Vesicles - Size(mm): 0.5-3.0 Percent: 40 Filling: NONE Shape: OBLONG TO Shape: ROUND Leg : 60 Top/Bottom Interval(mm): 540/ 570 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 266.00 Rock Type: IGNEOUS Core: 29 Sample Midpoint(m) : 266.56 Sect/Pc #: 1/PCE 10 ROCK = HIGH MG BRONZITE ANDESITE; Texture: VARIOLITIC* Phenocrysts- CLINOPYROXENE ( 3%) Size(mm): 0.2-1.0 Morphology: EUHEDRAL TO TABULAR FAIRLY FRESH* Groundmass - PLAGIOCLASE ( 35%) Morphology: SKELETAL TO QUENCH PARTLY ALTERED; GLASS ( 15%) DEVITRIFIED,UP TO 13% ADDITIONAL GLASS ALTERED TO CLAYS; CLINOPYROXENE ( 10%) Morphology: EUHEDRAL TO ANHEDRAL PARTLY ALTERED; MAGNETITE ( 4%) Morphology: ANHEDRAL Alteration - CLAY MINERALS ( 13%) Location: THROUGHOUT Replacing: GLASS + LINE VESICLES POSSIBLY REPLACING OPX(?) + PLAG + OL(?)* Vesicles - Size(mm): 0.1-1.0 Percent: 20 Location: THROUGHOUT Filling: NONE Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 920/ 950 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 266.00 Rock Type: IGNEOUS Core: 29 Sample Midpoint(m) : 266.93 Sect/Pc #: 1/PCE 16 ROCK = HIGH MG BRONZITE ANDESITE; Texture: VARIOLITIC* Phenocrysts- CLINOPYROXENE ( 4%) Size(mm): 0.1-0.5 Morphology: EUHEDRAL TO LATHLIKE PARTLY ALTERED TO CLAY* Groundmass - GLASS IDENTITY OF GLASS TOTALLY UNCERTAIN,OBSERVER INDICATES NO GLASS IN THIN SECTION-ICD STATES IT IS THE SAME AS PREVIOUS SECTION 54-57 WHICH HAS 25-28% GLASS; PLAGIOCLASE ( 20%) Size(mm): 0.1-0.5 Morphology: SKELETAL,TABULAR,DENDRITIC PARTLY ALTERED TO CLAYS; CLINOPYROXENE ( 5%) Size(mm): 0.1-0.2 Morphology: EUHEDRAL TO SKELETAL PARTLY ALTERED TO CLAYS; MAGNETITE ( 2%) Size(mm): 0.01-0.02 Morphology: SUBHEDRAL Alteration - CLAY MINERALS ( 25%) Location: THROUGHOUT Replacing: GLASS + CPX + PLAG + LINES Replacing: VESICLES ZEOLITE ( 2%) Vesicles - Percent: 40 Leg : 60 Top/Bottom Interval(mm): 380/ 400 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 266.00 Rock Type: IGNEOUS Core: 29 Sample Midpoint(m) : 267.89 Sect/Pc #: 2/PCE 5 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL; Where sampled: PILLOW INTERIOR AREA UNCERTAIN* Phenocrysts- CLINOPYROXENE ( TR%) Size(mm): 0.5-1.0 Groundmass - GLASS (35-40%) DEVITRIFIED BY ALTERATION; CLINOPYROXENE ( 15%) Size(mm): 0.3-1.0 Morphology: PRISMATIC TO GRANULAR PLAGIOCLASE ( 10%) Size(mm): 0.1X1.0 Morphology: SKELETAL TO ELONGATE CORES OF CPX(?) OR GLASS(?); PLAGIOCLASE Size(mm): 0.3X0.3 Morphology: SUBHEDRAL THE OTHER PLAG XTLS ENCLOSE THESE; MAGNETITE Size(mm): 0.01-0.05 Morphology: SKELETAL Alteration - CLAY MINERALS ( 40%) Replacing: GLASS UGLY GREENISH BROWN COLOR* Vesicles - Size(mm): 0.1-0.5 Percent: 10 Location: DISPERSED Filling: CLAY-LINED Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 390/ 420 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 266.00 Rock Type: IGNEOUS Core: 29 Sample Midpoint(m) : 267.91 Sect/Pc #: 2/PCE 6 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL; Where sampled: PILLOW INTERIOR AREA UNCERTAIN* Phenocrysts- CLINOPYROXENE ( <1%) Size(mm): 0.5-1.0 Morphology: GRANULAR VERY RARE; OLIVINE ( 0%) Groundmass - PLAGIOCLASE ( 20%) Size(mm): TO 0.5 Morphology: SKELETAL,ELONGATE,DENDRITIC Morphology: PROJECTIONS GLASS ( 20%) TOTALLY ALTERED TO CLAYS; CLINOPYROXENE ( 15%) Size(mm): TO 0.1 Morphology: GRANULAR,PRISMATIC ORTHOPYROXENE ( 5%) Alteration - CLAY MINERALS ( 20%) Replacing: GLASS CLAYS ARE GREEN TO BROWN* Vesicles - Size(mm): 0.2-0.5 Percent: 40 Location: DISPERSED Filling: PARTIAL CLAYS Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 480/ 490 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 266.00 Rock Type: IGNEOUS Core: 29 Sample Midpoint(m) : 267.99 Sect/Pc #: 2/PCE 6 ROCK = HIGH MG BRONZITE ANDESITE THIN SECTION IS SMALL; Texture: INTERSERTAL; Where sampled: PILLOW INTERIOR - FLOW INTERIOR AREA UNCERTAIN* Phenocrysts- CLINOPYROXENE ( TR%) Groundmass - GLASS ( 30%) TOTALLY ALTERED TO CLAYS,BROWN-GREEN COLOR; PLAGIOCLASE ( 25%) Size(mm): TO 0.5 Morphology: SKELETAL TO ELONGATE CLINOPYROXENE ( 20%) Size(mm): 0.05-0.3 Morphology: GRANULAR,PRISMATIC,SKELETAL, Morphology: DENDRITIC,SOME BLOCKY CHUNKS ORTHOPYROXENE ( 5%) MAGNETITE ( TR%) Size(mm): <0.01 Morphology: SKELETAL QUARTZ ( TR%) IDENTITY UNCERTAIN,OPTIC FIGURE CLOSE BUT SOMEWHAT OFF CENTER* Alteration - CLAY MINERALS ( 30%) Location: DISPERSED Replacing: GLASS Vesicles - Size(mm): 0.5-1.0 Percent: 20 Location: DISPERSED Filling: MINOR CLAY Shape: IRREGULAR Filling: LINING Leg : 60 Top/Bottom Interval(mm): 500/ 540 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 275.50 Rock Type: IGNEOUS Core: 30 Sample Midpoint(m) : 276.02 Sect/Pc #: 1/PCE 8 ROCK = BRONZITE ANDESITE; Texture: HYALOPILITIC WITH INCIPIENT VARIOLITES* Phenocrysts- CLINOPYROXENE ( 2%) Size(mm): 0.2-0.5 Morphology: SKELETAL TO DENDRITIC ACTUALLY JUST LARGER XTLS IN CONTINUUM; ORTHOPYROXENE ( TR%) IDENTITY UNCERTAIN,ENCLOSED WITHIN LARGER CPX XTLS,NO PARALLEL EXTINCTION* Groundmass - GLASS ( 53%) LOCALLY ALTERED TO ZEOLITES; CLINOPYROXENE ( 40%) Size(mm): 0.03-0.2 Morphology: SKELETAL,MICROLITIC SOME COALESCING HETEROGENEOUSLY; PLAGIOCLASE ( 0%) OPAQUE MINERALS ( 0%) Alteration - ZEOLITE ( 10%) Replacing: GLASS Vesicles - Size(mm): 0.15-1.0 Percent: 5 Location: RANDOM Filling: NONE SMALL THIN SECTION-ONLY FOUR OR FIVE PRESENT* Leg : 60 Top/Bottom Interval(mm): 1000/1040 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 275.50 Rock Type: IGNEOUS Core: 30 Sample Midpoint(m) : 276.52 Sect/Pc #: 1/PCE 16 ROCK = BRONZITE ANDESITE; Texture: HYALOPILITIC; Where sampled: GLASSY MARGIN* Phenocrysts- ORTHOPYROXENE ( <1%) Size(mm): 0.5-1.0 3 INTERGROWN XTLS,HAS SKELETAL INTERIOR HOLES* Groundmass - GLASS ( 64%) MOSTLY ALTERED TO CLAY; CLINOPYROXENE ( 30%) Size(mm): 0.1-1.0 Morphology: SKELETAL-ELONGATE MICROLITES LARGER ONES SHOW FLUIDAL ALIGNMENT* Alteration - ZEOLITE Location: CRACK ACROSS Location: THIN SECTION GLASS IS BROWN NEXT TO CRACK,ZEOLITES ARE 0.5MM- 2.0CM* Vesicles - Size(mm): 1.0-2.0 Percent: 5 Location: RANDOM Filling: CLAY-LINED THEN Shape: IRREGULAR- Filling: FILLED WITH Shape: FLATTENED Filling: ZEOLITES Leg : 60 Top/Bottom Interval(mm): 710/ 730 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 275.50 Rock Type: IGNEOUS Core: 30 Sample Midpoint(m) : 277.72 Sect/Pc #: 2/PCE 10 ROCK = BRONZITE ANDESITE; Texture: INTERSERTAL* Phenocrysts- CLINOPYROXENE ( TR%) Size(mm): 1.0 Groundmass - PLAGIOCLASE ( 25%) Size(mm): 0.2-0.5 Morphology: SKELETAL TO DENDRITIC ELONGATE WITH CENTERED INCLUSIONS; CLINOPYROXENE ( 13%) Size(mm): 0.1-0.8 Morphology: GRANULAR,PRISMATIC,SKELETAL GOES TO MORE SKELETAL AS SIZE DECREASES; GLASS ( 10%) ALTERED TO CLAYS; ORTHOPYROXENE ( 2%) RARER THAN IN HIGHER BASALTS-CORES 28-29; MAGNETITE ( TR%) Size(mm): 0.01-0.05 Morphology: SKELETAL TO SINGLE XTLS Alteration - CLAY MINERALS ( 5-10%) Replacing: GLASS PERVASIVE* Vesicles - Size(mm): 0.3-1.0 Percent: 50 Location: THROUGHOUT Leg : 60 Top/Bottom Interval(mm): 1000/1040 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 275.50 Rock Type: SEDIMENTARY Core: 30 Sample Midpoint(m) : 278.02 Sect/Pc #: 2/PCE 15 ROCK = LIMESTONE WITH GLASS FRAGMENTS OBSERVER CALLS THIS A LIMESTONE WITH VESICULAR ALTERED VOLCANIC (GLASS) FRAGMENTS; Texture: RECRYSTALLIZED VERY FINE,NO MICROFOSSILS,SOME MICRITE IN CAVITIES* Groundmass - GLASS ( 25%) TOTALLY ALTERED TO CLAYS; PLAGIOCLASE ( 15%) Morphology: SPHERULITIC NEEDLES CLINOPYROXENE ( 10%) Morphology: MICROLITES MAGNETITE ( TR%) Alteration - CLAY MINERALS ( 25%) Location: LINE VESICLES Replacing: GLASS PERVASIVE,CHARTREUSE COLOR* Vesicles - Size(mm): 0.1-0.4 Percent: 50 Location: THROUGHOUT Filling: CLAY-LINED Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 20/ 70 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 285.00 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 285.05 Sect/Pc #: 1/PCE 1 ROCK = HIGH MG BRONZITE ANDESITE; Texture: SUBOPHITIC,INTERSERTAL PATCHES; Where sampled: FLOW INTERIOR* Groundmass - GLASS ( 30%) DEVITRIFIED BY ALTERATION TO CLAYS; PLAGIOCLASE ( 25%) Size(mm): 0.1-0.5 Morphology: ELONGATE,TWINNED PRISMS APPROX COMP AN76-60 BY CARLSBAD-ALBITE METHOD, 2VX WITH LARGE V,TWO TYPES OF PLAG-EUHEDRAL AND ANHEDRAL; CLINOPYROXENE ( 25%) Size(mm): 0.1-0.5 Morphology: PRISMATIC-SKELETAL ORTHOPYROXENE ( 2%) ILMENITE ( 1%) Morphology: SKELETAL-GRANULAR MAGNETITE ( <1%) Morphology: SKELETAL,EQUANT HEMATITE ( TR%) Alteration - CLAY MINERALS ( 15%) Replacing: GLASS HEMATITE ( TR%) Vesicles - Percent: 10 Leg : 60 Top/Bottom Interval(mm): 1270/1290 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 285.00 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 286.28 Sect/Pc #: 1/PCE 18 ROCK = HIGH MG BRONZITE ANDESITE; Texture: SUBOPHITIC,INTERSERTAL LOCALLY INTERSERTAL NEAR VESICLES; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 35%) Size(mm): 0.1-0.3 Morphology: EQUANT-TABULAR TWO TYPES OF INTERSTITIAL PLAG-EUHEDRAL AND ANHEDRAL; CLINOPYROXENE ( 23%) Size(mm): 0.05-0.3 Morphology: GRANULAR-PRISMATIC GLASS ( 20%) ALTERED TO CLAYS; ORTHOPYROXENE ( 2%) MAGNETITE ( TR%) Size(mm): 0.01-0.05 Morphology: GRANULAR-SKELETAL Alteration - CLAY MINERALS ( 20%) Location: DISPERSED Replacing: GLASS Vesicles - Size(mm): 0.2-1.5 Percent: 20 Location: DISPERSED Filling: NONE Shape: IRREGULAR- Shape: ROUND TWO SIZES-SMALLER(15%) ARE 0.2MM-0.5MM AND ARE IRREGULAR,LARGER(5%) ARE 1.0MM-1.5MM AND ROUND* Leg : 60 Top/Bottom Interval(mm): 1300/1310 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 285.00 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 286.31 Sect/Pc #: 1/PCE 19 ROCK = HIGH MG BRONZITE ANDESITE; Texture: SUBOPHITIC; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 40%) Size(mm): 0.1-0.5 Morphology: TABULAR,EUHEDRAL,ANHEDRAL AS IN PREVIOUS SECTIONS HAS TWO TYPES OF PLAG- EUHEDRAL AND ANHEDRAL; CLINOPYROXENE ( 30%) Size(mm): 0.1-0.5 Morphology: TABULAR,EUHEDRAL SOME LARGER ONES HAVE INCLUSIONS; GLASS ( 15%) TOTALLY ALTERED TO CLAYS; ORTHOPYROXENE ( 2%) MAGNETITE ( 1%) Size(mm): 0.01-0.03 Morphology: EUHEDRAL,CUBIC Alteration - CLAY MINERALS ( 15%) Replacing: GLASS CHARTREUSE COLOR* Vesicles - Size(mm): 0.2-1.0 Percent: 12 Location: SCATTERED Filling: NONE Shape: IRREGULAR SMALLER MORE ABUNDANT ON ONE SIDE OF SECTION* Leg : 60 Top/Bottom Interval(mm): 1300/1350 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 285.00 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 286.33 Sect/Pc #: 1/PCE 19 ROCK = HIGH MG BRONZITE ANDESITE SAMPLE TAKEN FROM NEAR A LARGE VESICLE; Texture: SUBOPHITIC,SPHERULITIC MATERIAL NEAR LARGE VESICLE MORE SPHERULITIC* Groundmass - PLAGIOCLASE ( 39%) Size(mm): 0.1-0.5 Morphology: TABULAR-EUHEDRAL TWO TYPES OF PLAG IN THREE TO ONE PROPORTIONS OF EUHEDRAL TO ANHEDRAL; CLINOPYROXENE ( 34%) Size(mm): 0.1-0.7 Morphology: EUHEDRAL,TABULAR-SKELETAL GLASS ( 15%) ALTERED TO CLAYS; MAGNETITE ( 1%) Size(mm): 0.01-0.06 Morphology: EUHEDRAL,CUBIC-BLOCKY ORTHOPYROXENE ( 1%) 2VZ = 95,ENSTATITE* Alteration - CLAY MINERALS ( 15%) Replacing: GLASS Vesicles - Percent: 10 Leg : 60 Top/Bottom Interval(mm): 810/ 830 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 294.50 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 295.32 Sect/Pc #: 1/PCE 6 ROCK = HIGH MG BRONZITE ANDESITE; Texture: SUBOPHITIC* Groundmass - PLAGIOCLASE ( 40%) Size(mm): 0.2-1.0 Morphology: ELONGATE LATHS LATHS ARE TWINNED LENGTHWISE; CLINOPYROXENE ( 32%) Size(mm): 0.2-0.8 Morphology: PRISMATIC,MICROLITIC-SKELETAL GLASS ( 15%) CONTAINS NEEDLE-LIKE PLAG SPHERULITES,PARTLY ALTERED TO CLAYS; MAGNETITE ( 2%) Size(mm): 0.01-0.03 Morphology: EQUANT,CUBIC,BLOCKY ORTHOPYROXENE ( 1%) Alteration - CLAY MINERALS ( <5%) Replacing: GLASS Vesicles - Size(mm): 0.1-3.0 Percent: 10 Location: SCATTERED Shape: ROUND TO Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 640/ 660 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 294.50 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 296.65 Sect/Pc #: 2/PCE 9 ROCK = HIGH MG BRONZITE ANDESITE; Texture: SUBOPHITIC-INTERSERTAL; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 30%) Size(mm): 0.1-1.0 Morphology: TABULAR-ACICULAR PARTLY ALTERED,APPROX COMP AN70-75; CLINOPYROXENE ( 25%) Size(mm): 0.1-0.6 Morphology: EQUANT-TABULAR APPROX COMP UNCERTAIN,PARTLY ALTERED; GLASS ALTERED TO CLAYS AND ZEOLITES; CARBONATE ( 10%) ON EXTERIOR SURFACE; MAGNETITE ( 2%) Size(mm): 0.01-0.1 Morphology: EUHEDRAL-SKELETAL Alteration - CLAY MINERALS ( 10%) Location: LINE VESICLES Replacing: GLASS + CPX + PLAG IN PART CARBONATE ( 10%) Location: EXTERIOR Location: SURFACE ZEOLITE ( 3%) Location: INTERSTICES Replacing: GLASS Vesicles - Size(mm): 0.1-1.0 Percent: 20 Location: THROUGHOUT Filling: NONE Shape: IRREGULAR- Shape: OVOID MEAN SIZE IS 0.2MM* Leg : 60 Top/Bottom Interval(mm): 1230/1250 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 294.50 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 297.24 Sect/Pc #: 2/PCE 15B ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL-SUBOPHITIC; Where sampled: FLOW INTERIOR* Phenocrysts- CLINOPYROXENE ( TR%) MICROPHENOCRYSTS* Groundmass - GLASS ( 40%) ALTERED TO CLAYS,ZEOLITES,CARB; PLAGIOCLASE ( 30%) Size(mm): 0.1-0.6 Morphology: ACICULAR-TABULAR APPROX COMP UNCERTAIN,PARTLY ALTERED; CLINOPYROXENE ( 20%) Size(mm): 0.1-0.6 Morphology: EQUANT-TABULAR PARTLY ALTERED; MAGNETITE ( 2%) Size(mm): 0.01-0.1 Alteration - CLAY MINERALS ( 10%) Location: INTERSTITIAL Replacing: GLASS ZEOLITE ( 3%) Location: INTERSTITIAL Replacing: GLASS+VESICLES CARBONATE ( 2%) Location: INTERSTITIAL Replacing: GLASS Vesicles - Size(mm): 0.1-1.0 Percent: 8 Location: THROUGHOUT Filling: MINOR ZEOLITES Shape: IRREGULAR- Shape: OVOID MEAN SIZE IS 0.2MM* Leg : 60 Top/Bottom Interval(mm): 1130/1170 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 294.50 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 298.65 Sect/Pc #: 3/PCE 12B ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 30%) Size(mm): 0.1-1.0 Morphology: TABULAR,SPHERULITIC,DENDRITIC MOSTLY TABULAR-ONLY SOME SPHERULITIC + DENDRITIC, APPROX COMP AN70; GLASS ( 25%) MOSTLY ALTERED TO CLAYS; CLINOPYROXENE ( 10%) Size(mm): 0.01-1.0 Morphology: EQUANT-TABULAR PARTLY ALTERED TO CLAY,MEAN = 0.5MM; MAGNETITE ( 4%) Alteration - CLAY MINERALS ( 20%) Location: INTERSTITIAL Replacing: CPX + PLAG + GLASS ZEOLITE ( 2%) Location: LINE VESICLES Replacing: UNCERTAIN CARBONATE ( TR%) Location: INTERSTITIAL Replacing: GLASS Vesicles - Size(mm): 0.1-0.6 Percent: 30 Location: THROUGHOUT Filling: NONE Shape: IRREGULAR- Shape: OVOID Leg : 60 Top/Bottom Interval(mm): 400/ 420 Describer: Meijer, A. Hole: 458 Top of Core Depth(m) : 294.50 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 299.41 Sect/Pc #: 4/PCE 4B ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL-SUBOPHITIC; Where sampled: FLOW INTERIOR* Groundmass - GLASS ( 30%) DEVITRIFIED MOSTLY,ALTERED TO CLAYS AND ZEOLITES; PLAGIOCLASE ( 25%) Size(mm): 0.1-1.0 Morphology: ACICULAR-TABULAR APPROX COMP AN70,PARTLY ALTERED TO CLAY; CLINOPYROXENE ( 25%) Size(mm): 0.1-0.6 Morphology: EQUANT-TABULAR APPROX COMP UNCERTAIN,PARTLY ALTERED TO CLAY; MAGNETITE Morphology: EQUANT-ANHEDRAL Alteration - CLAY MINERALS ( 20%) Location: INTERSTICES Replacing: GLASS + CPX + PLAG ZEOLITE ( 2%) Location: INTERSTICES Replacing: GLASS Vesicles - Size(mm): 0.1-1.0 Percent: 15 Location: THROUGHOUT Filling: MINOR ZEOLITES Shape: IRREGULAR- Shape: OVOID Leg : 60 Top/Bottom Interval(mm): 580/ 600 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 304.00 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 304.59 Sect/Pc #: 1/PCE 8 ROCK = HIGH MG BRONZITE ANDESITE COARSE GRAINED; Texture: SUBOPHITIC; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 60%) Size(mm): 0.1-1.0 Morphology: EUHEDRAL-MICROLITIC-PATCHY PLAG IS OF TWO TYPES-40% IS EUHEDRAL-TABULAR- MICROLITIC-IDIOMORPHIC AND 60% IS PATCHY- INTERSTITIAL-XENOMORPHIC,ABUNDANT; CLINOPYROXENE ( 22%) Size(mm): 0.1-0.5 Morphology: GRANULAR-PRISMATIC MICROCRYST GROUNDMASS ( 5%) QUARTZ ( 2%) Size(mm): 0.1-0.2 Morphology: ANHEDRAL Alteration - CLAY MINERALS ( 3%) IN MESOSTASIS* Vesicles - Size(mm): 0.1-0.8 Percent: 10 Location: SCATTERED Filling: NONE Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 700/ 720 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 304.00 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 306.21 Sect/Pc #: 2/PCE 8B ROCK = HIGH MG BRONZITE ANDESITE COARSEST GRAINED ROCK AT SITE 458; Texture: SUBOPHITIC; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 40%) Morphology: TABULAR-MICROLITE,PATCHY TWO TYPES OF PLAG-TABULAR TO MICROLITE AND PATCHY INTERSTITIAL; CLINOPYROXENE ( 34%) MICROCRYST GROUNDMASS ( 15%) ALTERED TO BROWN AND GREEN CLAYS AND FE.OXIDES; MAGNETITE ( 1%) Morphology: CUBIC,SKELETAL ORTHOPYROXENE ( TR%) ALTERATION TO CLAYS* Alteration - CARBONATE ( 10%) ALL IN ONE VEIN ABOUT 0.5CM WIDE; CLAY MINERALS ( 5%) IN MESOSTASIS* Vesicles - Size(mm): 0.1-1.0 Percent: 10 Location: SCATTERED Filling: NONE Shape: IRREGULAR INTERSERTAL BROWN PATCHES NEAR LARGER VESICLES* Leg : 60 Top/Bottom Interval(mm): 480/ 520 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 313.50 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 315.50 Sect/Pc #: 2/PCE 2A ROCK = HIGH MG BRONZITE ANDESITE FAIRLY COARSE GRAINED; Texture: SUBOPHITIC; Groundmass - PLAGIOCLASE ( 40%) Morphology: EUHEDRAL,MICROLITIC,PATCHY TWO TYPES OF PLAG-MICROLITIC AND INTERSTITIAL, APPROX COMP AN45,2VZ OF 85; CLINOPYROXENE ( 23%) Morphology: EUHEDRAL,PRISMATIC-SKELETAL MICROCRYST GROUNDMASS ( 10%) CLAYS; MAGNETITE ( 1%) Morphology: CUBIC-SKELETAL QUARTZ ( 1%) IDENTITY UNCERTAIN,STRAINED* Alteration - CLAY MINERALS ( 10%) ZEOLITE ( TR%) Location: INTERSTITIAL Replacing: GLASS CARBONATE ( TR%) Location: FILL VESICLES Vesicles - Percent: 20 Leg : 60 Top/Bottom Interval(mm): 80/ 100 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 323.00 Rock Type: IGNEOUS Core: 35 Sample Midpoint(m) : 323.09 Sect/Pc #: 1/PCE 2 ROCK = HIGH MG BRONZITE ANDESITE; Texture: SUBOPHITIC; Where sampled: FLOW INTERIOR* Groundmass - PLAGIOCLASE ( 30%) Size(mm): 0.1-0.7 Morphology: MICROLITIC PATCHY INTERSTITIAL MATERIAL AS WELL,SOME LOW 2VZ POSSIBLY K-OLIGOCLASE(?); GLASS ( 28%) ALTERED AFTER INTERSERTAL GLASS,MESOSTASIS; CLINOPYROXENE ( 20%) Size(mm): 0.1-0.7 QUARTZ ( TR%) IDENTITY UNCERTAIN,MOSTLY STRAINED* Alteration - CLAY MINERALS ( 15%) Replacing: INTERSERTAL GLASS CARBONATE ( 2%) Location: IN ONE VEIN Vesicles - Size(mm): 0.1-1.0 Percent: 20 Location: SCATTERED Filling: NONE Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 690/ 710 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 323.00 Rock Type: IGNEOUS Core: 35 Sample Midpoint(m) : 325.20 Sect/Pc #: 2/PCE 8 ROCK = HIGH MG BRONZITE ANDESITE ALTERED GLASSY CPX-RICH,OF ALL OF THIS TYPE OF ROCK IN CORES 28-40 THIS IS THE GLASSIEST,CLOSEST TO PILLOW MARGIN; Texture: SPHERULITIC; Where sampled: GLASSY MARGIN* Groundmass - GLASS ( 85%) FAINTLY BIREFRINGENT NEEDLES DISPERSED IN GLASS- POSSIBLY PLAG(?) OR CLAYS(?); CLINOPYROXENE ( 10%) Morphology: MICROLITIC,SPHERULITIC MOST ARE SPHERULITIC,CPX ABUNDANT SHEAF SPHERULITES* Alteration - CLAY MINERALS Replacing: CPX + GLASS Vesicles - Size(mm): 0.05-0.1 Percent: 5 Location: SCATTERED Filling: NONE Shape: ROUND Leg : 60 Top/Bottom Interval(mm): 450/ 470 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 342.00 Rock Type: IGNEOUS Core: 37 Sample Midpoint(m) : 342.46 Sect/Pc #: 1/PCE 5 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL-SPHERULITIC; Where sampled: PILLOW INTERIOR-FLOW INTERIOR; AREA UNCERTAIN,ROCK IS IN TWO ZONES* Groundmass - MICROCRYST GROUNDMASS ( 50%) MESOSTASIS IS BROWN GLASS WITH ABUNDANT TINY XTLS OF PLAG + CPX,NOW LARGELY ALTERED TO CLAYS; PLAGIOCLASE ( 30%) Morphology: MICROLITIC CLINOPYROXENE ( 14%) Morphology: IRREGULAR,SKELETAL ORTHOPYROXENE ( 1%) MAGNETITE ( TR%) Alteration - CLAY MINERALS ( 25%) Replacing: MESOSTASIS Vesicles - Size(mm): 0.1-1.0 Percent: 5 Location: SCATTERED Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 50/ 70 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 351.50 Rock Type: IGNEOUS Core: 38 Sample Midpoint(m) : 351.56 Sect/Pc #: 1/PCE 1A ROCK = HIGH MG BRONZITE ANDESITE; Texture: HYALOPILITIC,SOMEWHAT PILOTAXITIC; Where sampled: GLASSY MARGIN* Phenocrysts- CLINOPYROXENE ( 5%) Size(mm): 0.2-0.7 Morphology: SKELETAL,DENDRITIC,PRISMATIC ORTHOPYROXENE ( 1%) Size(mm): 0.3-0.5 Morphology: PRISMATIC 2VX OF 80-85,BRONZITE* Groundmass - GLASS ( 54%) ONCE ALL GLASS-NOW ALTERED,GLASSY FRAGMENT WITH INTENSE ZONED ALTERATION TO ZEOLITE + CLAYS + FE-OXIDES ON RIMS,CLEAR ZEOLITE ALONE IN MIDDLE; CLINOPYROXENE ( 35%) Size(mm): 0.01-0.1 Morphology: MICROLITES CPX NOT AFFECTED BY GLASS ALTERATION* Alteration - CLAY MINERALS Replacing: GLASS ZEOLITE Replacing: GLASS PROPORTIONS VARY FROM PLACE TO PLACE OF ZEOLITES AND CLAYS* Vesicles - Size(mm): 0.5-1.0 Percent: 5 Location: ON ONE SIDE Filling: CLAYS + ZEOLITE Shape: ROUND Leg : 60 Top/Bottom Interval(mm): 330/ 350 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 370.50 Rock Type: IGNEOUS Core: 40 Sample Midpoint(m) : 370.84 Sect/Pc #: 1/PCE 1D ROCK = HIGH MG BRONZITE ANDESITE ALTERED; Texture: HYALOPILITIC; Where sampled: GLASSY MARGIN* Phenocrysts- CLINOPYROXENE ( 3%) Size(mm): 0.2-0.5 Morphology: SKELETAL-PRISMATIC ALTERED* Groundmass - GLASS ( 47%) ONCE GLASS BUT NOW CLAYS AND HAS A STREAKY APPEARANCE OF FLOW PRODUCED LINES OF CLEAR CPX- FREE GLASS NOW ALTERED TO CLAYS; CLINOPYROXENE ( 10%) Size(mm): 0.1-0.3 Morphology: SKELETAL,MICROLITIC TINY SKELETAL MICROLITES* Alteration - CLAY MINERALS ( 60%) Replacing: CPX+GLASS+LINE VESICLES Vesicles - Size(mm): 0.1-0.5 Percent: 40 Leg : 60 Top/Bottom Interval(mm): 880/ 900 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 370.50 Rock Type: IGNEOUS Core: 40 Sample Midpoint(m) : 372.89 Sect/Pc #: 2/PCE 7 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL ALTERED,SOME SPHERULITIC ASPECTS; Where sampled: PILLOW INTERIOR* Phenocrysts- CLINOPYROXENE ( 5%) Size(mm): 0.2-0.7 Morphology: SKELETAL ALTERED MOSTLY TO CLAYS* Groundmass - CLINOPYROXENE ( 5%) Size(mm): 0.1-0.2 ABUNDANT INTERSTITIAL CPX MICROLITES ARRANGED IN SPHERULITIC SWORLS AND NEEDLES,MANY ARE SKELETAL AND ALTERED TO CLAYS; PLAGIOCLASE AMOUNT HARD TO ESTIMATE* Alteration - CLAY MINERALS ( 50%) Location: MOST PLACES Replacing: MOST OF THE ROCK Vesicles - Size(mm): 0.1-1.0 Percent: 40 Location: SCATTERED Filling: CLAY-LINED Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 30/ 50 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 380.00 Rock Type: IGNEOUS Core: 41 Sample Midpoint(m) : 380.04 Sect/Pc #: 1/PCE 1 ROCK = APHYRIC BASALT; Texture: INTERSERTAL; Where sampled: FLOW INTERIOR; AREA UNCERTAIN* Phenocrysts- PLAGIOCLASE ( TR%) Size(mm): 0.5-1.0 APPROX COMP UNCERTAIN,NONE ORIENTED FOR COMP.; CLINOPYROXENE ( TR%) APPROX COMP UNCERTAIN* Groundmass - GLASS ( 52%) DIVIDED BETWEEN BROWN OXIDIZED GLASS AND PALE GREEN CLAYS,BROWN MOST ABUNDANT NEAR INTERCONNECTED VESICLES; PLAGIOCLASE ( 25%) Morphology: MICROLITIC CLINOPYROXENE ( 5%) Morphology: MICROLITIC-SKELETAL CPX ABUNDANCE LOW AS A RESULT OF REPLACEMENT BY CLAYS AND OPAQUES; MAGNETITE ( 3%) Morphology: CUBIC,SKELETAL Alteration - CLAY MINERALS ( 25%) Location: SCATTERED Replacing: CPX+GLASS+LINE VESICLES Vesicles - Size(mm): 0.1-5.0 Percent: 15 Location: SCATTERED Filling: MOST EMPTY Shape: ROUND TO Shape: ELONGATE STRUNG OUT IN LINES,SOME INTERCONNECTED* Leg : 60 Top/Bottom Interval(mm): 220/ 260 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 380.00 Rock Type: IGNEOUS Core: 41 Sample Midpoint(m) : 380.24 Sect/Pc #: 1/PCE 1 ROCK = APHYRIC BASALT; Texture: INTERSERTAL; Where sampled: PILLOW INTERIOR* Phenocrysts- PLAGIOCLASE ( TR%) Size(mm): 1.0 Morphology: EUHEDRAL ONE RIDDLED WITH HOLES,APPROX COMP UNCERTAIN; CLINOPYROXENE ( TR%) Groundmass - MICROCRYST GROUNDMASS ( 55%) MOSTLY GLASS ALTERED TO CLAYS,DARKER MORE SPHERULITIC ZONES NEAR VESICLES; PLAGIOCLASE ( 25%) Morphology: TABULAR,MICROLITIC,SKELETAL, Morphology: IRREGULAR MOSTLY MICROLITIC; CLINOPYROXENE ( 4%) MAGNETITE ( 1%) Alteration - CLAY MINERALS ( >50%) Location: MOST PLACES Replacing: GLASS MOST IS CLEAR,SOME PALE BROWN OR PALE GREEN* Vesicles - Size(mm): 0.1-1.0 Percent: 15 Location: SCATTERED Filling: NONE Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 340/ 370 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 399.00 Rock Type: IGNEOUS Core: 43 Sample Midpoint(m) : 399.36 Sect/Pc #: 1/PCE 6 ROCK = HIGH MG BRONZITE ANDESITE VERY BADLY ALTERED AND THEREFORE CANNOT DO MUCH QUANTITATIVELY; Texture: SPHERULITIC; Where sampled: NEXT TO GLASSY MARGIN* Groundmass - PLAGIOCLASE ABUNDANT SWORLS OF SPHERULITIC PLAG; CLINOPYROXENE MINOR SKELETAL CPX,CRYSTALLIZED BEFORE PLAG,PLAG AND CPX RELATIVE ABUNDANCIES QUITE DIFFERENT FROM CORE 41 THIN SECTIONS; GLASS GLASS IN BETWEEN SPHERULITE FIBERS NOW ALTERED TO CLAYS,CLAYS ARE UBIQUITOUS* Alteration - CLAY MINERALS Replacing: GLASS Vesicles - Size(mm): 0.1-1.0 Percent: 10 Location: SCATTERED Filling: CLAYS Shape: ROUND TO Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 1040/1070 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 399.00 Rock Type: IGNEOUS Core: 43 Sample Midpoint(m) : 400.06 Sect/Pc #: 1/PCE 19 ROCK = HIGH MG BRONZITE ANDESITE; Texture: INTERSERTAL,APHYRIC,SPHERULITIC SPHERULITIC NEAR VESICLES; Where sampled: PILLOW INTERIOR AREA UNCERTAIN* Groundmass - PLAGIOCLASE ( 50%) Size(mm): 0.2-0.5 Morphology: SKELETAL-EUHEDRAL,ANHEDRAL TWO TYPES-INTERSTITIAL TYPE IS ANHEDRAL WITH APPROX COMP OF AN45,SKELETAL-EUHEDRAL TYPE HAS APPROX COMP OF AN50-55; MICROCRYST GROUNDMASS ( 37%) ALTERED TO CLAYS + FE-OXIDES,BROWNISH COLOR; CLINOPYROXENE ( 5%) Size(mm): <0.2 MORPHOLOGY DIFFICULT TO RESOLVE BECAUSE OF COMPOSITION; MAGNETITE ( 1%) Morphology: CUBIC Alteration - CLAY MINERALS Replacing: GLASS + VESICLES Vesicles - Size(mm): 0.1-1.5 Percent: 7 Location: SCATTERED Filling: SOME WITH Shape: ROUND TO Filling: YELLOW CLAYS Shape: IRREGULAR Leg : 60 Top/Bottom Interval(mm): 780/ 800 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 427.50 Rock Type: IGNEOUS Core: 46 Sample Midpoint(m) : 428.29 Sect/Pc #: 1/PCE 7 ROCK = APHYRIC BASALT THIN SECTION IS POOR; Texture: PILOTAXITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- PLAGIOCLASE ( TR%) Size(mm): 0.1-0.2 Morphology: EUHEDRAL MICROPHENOCRYSTS* Groundmass - GLASS ( 89%) LITTLE RED ALTERATION ZONES PARALLELING DIRECTION OF PLAG ALIGNMENT-PROBABLY ARE PARTINGS AND VESICLE STRINGS IN THE ROCK,MICROXLN ONCE GLASS NOW ALTERED TO CLAYS + RED FE-OXIDES (SKELETAL); PLAGIOCLASE ( 10%) APPROX COMP AN54(?),MAX. EXTINCTION,FLUIDAL ALIGNMENT; CLINOPYROXENE ( TR%) Morphology: SKELETAL PROBABLY NEEDLE-LIKE SPHERULITES* Alteration - CLAY MINERALS Location: MOST PLACES Replacing: GLASS PERCENT MEANINGLESS-TOO DISPERSED WITH FE-OX ETC.* Vesicles - Size(mm): 0.2-0.5 Percent: 1 Location: SCATTERED Filling: CLAY-LINED Shape: ROUND ONLY A FEW PRESENT* Leg : 60 Top/Bottom Interval(mm): 690/ 710 Describer: Natland, J. Hole: 458 Top of Core Depth(m) : 446.50 Rock Type: IGNEOUS Core: 48 Sample Midpoint(m) : 447.20 Sect/Pc #: 1/PCE 1 ROCK = APHYRIC BASALT; Texture: PILOTAXITIC; Where sampled: NEXT TO GLASSY MARGIN* Phenocrysts- PLAGIOCLASE ( TR%) Morphology: EUHEDRAL APPROX COMP AN72 BY A-NORMAL METHOD; CLINOPYROXENE ( TR%) Morphology: GRANULAR Groundmass - GLASS ( 84%) MESOSTASIS OF HIGHLY ALTERED DEVITRIFIED GLASS WHOSE COLOR IS NOW MURKY BROWN,IT IS NOT TRANSLUCENT; PLAGIOCLASE ( 10%) Size(mm): 0.02-0.07 Morphology: MICROLITIC CLINOPYROXENE ( 6%) Morphology: MICROLITIC,SKELETAL MAGNETITE ( TR%) Alteration - CLAY MINERALS Location: DISPERSED Replacing: GLASS MODERATELY ABUNDANT; FERROUS OXIDE Location: DISPERSED Replacing: GLASS RED COLOR,ABUNDANT* Vesicles - Size(mm): 0.1-1.0 Percent: 3-4 Location: SCATTERED Filling: CLAY-LINED Shape: ROUND |
Cite as: Deep Sea Drilling Project (1989): Archive of Core and Site/Hole Data and Photographs from the Deep Sea Drilling Project (DSDP). National Geophysical Data Center, NOAA. doi:10.7289/V54M92G2 [access date]
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