Leg : 64 Top/Bottom Interval(mm): 480/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 222.00 Rock Type: IGNEOUS Core: 26 Sample Midpoint(m) : 222.48 Sect/Pc #: 1/PCE 6 ROCK = APHYRIC BASALT; Texture: APHYRIC,INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Groundmass - PLAGIOCLASE ( 60%) Size(mm): 1.5 Morphology: LATH-SHAPED UP TO 1.5 MM LONG,APPROX COMP AN62-68,NORMALLY ZONED,INTERSTITIAL; CLINOPYROXENE ( 25%) Size(mm): 0.1-0.5 Morphology: ANHEDRAL APPROX COMP AUGITE?,VERY PALE BROWN,INTERGRANULAR; MAGNETITE ( 3%) Size(mm): 0.1-0.3 Morphology: CUBOID ESPECIALLY IN ALTERATION AREAS; ILMENITE ( 3%) Size(mm): TO 0.5 Morphology: ELONGATE,TRELLIS PATTERN, Morphology: SKELETAL ESPECIALLY IN ALTERATION AREAS* Alteration - CLAY MINERALS ( 10%) Location: INTERSTITIAL Replacing: MESOSTASIS,OL INTERSTITIAL AND AS ANHEDRAL PSEUDOMORPHS, REPLACING MESOSTASIS? AND POSSIBLY OL,GREEN CLAY?* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 450/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 231.50 Rock Type: IGNEOUS Core: 27 Sample Midpoint(m) : 231.95 Sect/Pc #: 1/PCE 4A ROCK = APHYRIC BASALT ALTERED; Texture: APHYRIC,INTERSERTAL,VESICULAR; Where sampled: OTHER SILL INTERIOR* Groundmass - PLAGIOCLASE ( 40%) Size(mm): 0.2-0.8 Morphology: LATHS,SKELETAL SKELETAL MICROLITES,INTERSTITIAL; CLINOPYROXENE ( 10%) Size(mm): <0.1 Morphology: ANHEDRAL SOME MAY BE OL (TOO SMALL TO BE SURE); MAGNETITE ( 3%) Size(mm): 0.01-0.1 Morphology: CUBOID,EUHEDRAL ILMENITE ( 3%) Size(mm): TO 0.1 Morphology: ELONGATE,TRELLIS Alteration - CLAY MINERALS ( 40%) Location: THROUGHOUT Replacing: MESOSTASIS,OL REPLACING MESOSTASIS? AND POSSIBLY OL* Vesicles - Size(mm): 1-1.5 Percent: <3 Location: RANDOM Shape: SPHERICAL FILLING IS NOT-PRESERVED* Leg : 64 Top/Bottom Interval(mm): 820/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 231.50 Rock Type: IGNEOUS Core: 27 Sample Midpoint(m) : 232.32 Sect/Pc #: 1/PCE 7 ROCK = APHYRIC BASALT; Texture: APHYRIC,INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Groundmass - PLAGIOCLASE ( 50%) Size(mm): <0.5 Morphology: LATH-SHAPED INTERSTITIAL,APPROX AN50?; CLINOPYROXENE ( 10%) Size(mm): <0.1 Morphology: ANHEDRAL INTERGRANULAR,SOME MAY BE OL (TOO SMALL TO SEE); OPAQUE MINERALS ( 5%) Size(mm): <0.2 Morphology: SUBHEDRAL-EUHEDRAL INCLUDES MAGN + ILMENITE* Alteration - CARBONATE ( 1%) Location: VESICLES PERCENTAGE QUESTIONABLE,POSSIBLY MORE IN GROUNDMASS; CLAY MINERALS ( 35%) Location: INTERSTITIAL Replacing: MESOSTASIS,OL REPLACING OL IS QUESTIONABLE,IRON-RICH,GREEN IN COLOR* Vesicles - Size(mm): TO 10 Percent: 3 Location: RANDOM Filling: MESOSTASIS, Shape: OVOID Filling: VESICLES,PLAG "COMPOUND" VESICLES (TO 10 MM) WITH SMALLER (0.5- 1.0 MM) EMPTY VESICLES INSIDE,FILLING CONSISTS OF COARSE-GRAINED IRON-RICH MESOSTASIS + PLAG + VESICLES; Size(mm): 0.3 Percent: <1 Location: RANDOM Filling: CLAY.MIN, Shape: SPHERICAL Filling: CALCITE "ORDINARY" VESICLES* Leg : 64 Top/Bottom Interval(mm): 500/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 336.00 Rock Type: IGNEOUS Core: 40 Sample Midpoint(m) : 339.50 Sect/Pc #: 3/PCE 1B ROCK = PLAG SPARSELY PHYRIC DOLERITE; Texture: SPARSELY PORPHYRITIC,SUBOPHITIC-INTERGRANULAR; OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE ( 1-2%) Size(mm): 2 Morphology: EQUANT-TABULAR ZONED,RARE; CLINOPYROXENE LARGE PYX'S MAY BE PHENOS OR GROUNDMASS PHASES* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 40%) Size(mm): 0.5-1.5 Morphology: LATH-SHAPED PLAG OCCURS AS OPHITIC INCLUSIONS IN PYX AND AS XTLS BETWEEN PYX XTLS; CLINOPYROXENE ( 35%) Size(mm): TO 4 Morphology: ANHEDRAL APPROX COMP AUGITE? (PALE BROWN),TWO TYPES PRESENT 1)LARGE (PHENOS?) IRREGULAR XTLS ENCLOSING PLAG AND 2)SMALLER INTERGRANULAR XTLS; OPAQUE MINERALS ( 5%) Size(mm): 0.2 Morphology: CUBOID,ELONGATE INCLUDES MAGN + ILMENITE,MAGN IS CUBOID AND ILMENITE IS ELONGATE* Alteration - COMBINATION ( 15%) Location: INTERSTICES Replacing: MESOSTASIS,OL,FEL INCLUDES CLAY.MIN + ZEOLITES,REPLACES MESOSTASIS? AND POSSIBLY OL?,MINOR ALTERATION OF FELDSPARS* Vesicles - Size(mm): 1 Percent: 3 Location: INTERGRANULAR Filling: CLAY.MIN, Shape: SPHERICAL Filling: ZEOLITES ZEOLITE FILLING IS QUESTIONABLE,CLAY IS GREEN* Leg : 64 Top/Bottom Interval(mm): 820/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 345.50 Rock Type: IGNEOUS Core: 41 Sample Midpoint(m) : 346.32 Sect/Pc #: 1/PCE 3 ROCK = DOLERITE; Texture: APHYRIC,SUBOPHITIC-INTERGRANULAR; Where sampled: OTHER SILL INTERIOR,ZONE OF APPARENT FELDSPAR ACCUMULATION* Phenocrysts- CLINOPYROXENE SOME CPX MAY BE PHENOS* Groundmass - OLIVINE ( <5%) Size(mm): 0.3-0.8 Morphology: ANHEDRAL PLAGIOCLASE ( 30%) Size(mm): TO 2 Morphology: ELONGATE,LATH-SHAPED ABOUT ONE-FOURTH ARE ENCLOSED IN CPX XTLS,STRONGLY ZONED; CLINOPYROXENE ( 25%) Size(mm): TO 3 Morphology: IRREGULAR,AGGREGATES APPROX COMP AUGITE,OPTICALLY CONTINUOUS AGGREGATES AND IRREGULAR XTLS; OPAQUE MINERAL ( 3%) Size(mm): <0.3 Morphology: IRREGULAR,ANHEDRAL INCLUDES MAGN + ILMENITE; PYRITES ( 2%) Morphology: AGGREGATES IDENTITY UNCERTAIN,AGGREGATES IN VEINS* Alteration - COMBINATION ( 35%) Location: INTERSTICES Replacing: MESOSTASIS,OL,CPX,PLAG INCLUDES GREEN FIBROUS CLAY.MIN AND ZEOLITES?, REPLACING MESOSTASIS? (A LOT OF WHICH APPEARS TO HAVE BEEN LOST IN THIN SECTION PREPARATION) + OL + SOME CPX + SOME PLAG* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 800/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 345.50 Rock Type: IGNEOUS Core: 41 Sample Midpoint(m) : 350.80 Sect/Pc #: 4/PCE 1D ROCK = DOLERITE; Texture: APHYRIC,OPHITIC,INTERGRANULAR OPHITIC (PLAG IN PYX) WITH ALTERED INTERGRANULAR ZONES; Where sampled: OTHER SILL INTERIOR* Phenocrysts- CLINOPYROXENE LARGE ANHEDRAL PYX XTLS MAY BE PHENOS* Groundmass - OLIVINE ( <5%) Size(mm): 0.5 Morphology: ANHEDRAL PLAGIOCLASE ( 30%) Size(mm): 0.5-3 Morphology: LATH-SHAPED APPROX COMP AN54 (1 DETERMINED BY THE MICHAEL-LEVY METHOD),OPHITICALLY ENCLOSED BY CPX AND INTERSTITIAL TO CPX; CLINOPYROXENE ( 40%) Size(mm): 1-4 Morphology: ANHEDRAL APPROX COMP AUGITE?,LARGE XTLS AND SMALLER MORE INTERSTITIAL GRAINS; OPAQUE MINERALS ( 5%) Size(mm): 0.2-0.4 Morphology: ANHEDRAL,ELONGATE INCLUDE MAGN + ILMENITE,DISSEMINATED,SOME ELONGATE GRAINS OF ILMENITE* Alteration - COMBINATION ( 20%) Location: INTERSTITIAL Replacing: MESOSTASIS,PYX,OL,PLAG INCLUDES GREEN CLAY.MIN + ZEOLITES,INTERSTITIAL TO LARGE PYX XTLS,REPLACING MESOSTASIS + RIMMING PYX + RIMMING OL + SLIGHT ALTERATION OF INTERGRANULAR PLAG* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 600/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 345.50 Rock Type: IGNEOUS Core: 41 Sample Midpoint(m) : 353.60 Sect/Pc #: 6/PCE 1E ROCK = DOLERITE; Texture: APHYRIC,SUBOPHITIC,GLOMEROPORPHYRITIC GLOMEROPORPHYRITIC IS QUESTIONABLE,THE TEXTURE IN THIS ROCK IS UNUSUAL. THE PYX AND PLAG XTLS ARE INTERGROWN TO FORM SUBOPHITIC AND GLOMEROPHYRIC MASSES (APPROX 3-5 MM ACROSS) ENCLOSED IN A VERY FINE GRAINED AND VERY ALTERED MESOSTASIS OR QUENCHED BASALT. THIS SUGGESTS THAT CPX + OL + PLAG ARE MAINLY PHENOS; Where sampled: OTHER SILL INTERIOR* Groundmass - OLIVINE ( 3%) Size(mm): 0.5-1.0 Morphology: ANHEDRAL ADJACENT TO OR ENCLOSED BY CPX; PLAGIOCLASE ( 20%) Size(mm): TO 3 Morphology: LATH-SHAPED INTERGROWN WITH CPX AND INTERGRANULAR TO CPX; CLINOPYROXENE ( 20%) Size(mm): TO 4 APPROX COMP AUGITE,LARGE SEMI-CONTINUOUS XTLS; MAGNETITE ( 3%) Size(mm): TO 1.0 Morphology: SKELETAL,CUBOID APPROX COMP TITANOMAGNETITE* Alteration - COMBINATION ( 50%) Location: INTERSTITIAL Replacing: MESOSTASIS INCLUDES CLAY.MIN + ZEOLITES,INTERSTITIAL TO PYX + PLAG GLOMEROCRYSTS,PROBABLY REPLACING A FINE GRAINED BASALT OR A MESOSTASIS,MOSTLY LOST DURING THIN SECTION PREPARATION* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 850/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 355.00 Rock Type: IGNEOUS Core: 42 Sample Midpoint(m) : 357.35 Sect/Pc #: 2/PCE 1F ROCK = DOLERITE; Texture: PORPHYRITIC,OPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 20%) Size(mm): 1 Morphology: LATHS APPROX COMP AN40,OPHITICALLY ENCLOSED IN CPX; CLINOPYROXENE ( 20%) Size(mm): 1-4 Morphology: ANHEDRAL-SUBHEDRAL APPROX COMP AUGITE,IRREGULARLY FRACTURED* Groundmass - OLIVINE ( 0%) PLAGIOCLASE ( 25%) Size(mm): <1 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 5%) Size(mm): <1 Morphology: ANHEDRAL APPROX COMP AUGITE; OPAQUE MINERALS ( 10%) INCLUDES MAGN + ILMENITE* Alteration - CARBONATE ( 0%) COMBINATION ( 20%) Replacing: PLAG INCLUDES CLAY.MIN + ZEOLITES,FOUND IN AREAS OF APHANITIC TEXTURE (QUENCHED?),REPLACING PLAG MICROLITES* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 1160/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 355.00 Rock Type: IGNEOUS Core: 42 Sample Midpoint(m) : 357.66 Sect/Pc #: 2/PCE 1G ROCK = GABBRO; Texture: GABBROIC (CUMULATE),OPHITIC,GRAPHIC,INTERSERTAL THE TEXTURE OF THIS ROCK IS UNUSUAL BUT SIMILAR TO 41-6-60. HOWEVER THE INTERSTITIAL MESOSTASIS IS BETTER PRESERVED AND SEVERAL OF THE FRAGMENTS ARE GABBROIC. ONE FRAGMENT (APPROX 12 MM LONG) COMPRISES CUMULATE PLAG WHILE ANOTHER SHOWS A GRAPHIC INTERGROWTH OF PLAG IN PYX; Where sampled: OTHER SILL INTERIOR,GABBROIC INCLUSION AND ALTERED ZONE* Groundmass - OLIVINE ( 5%) Size(mm): 0.5-1.0 Morphology: ANHEDRAL ASSOCIATED WITH CPX/PLAG CLUSTERS; PLAGIOCLASE ( 30%) Size(mm): TO 5 Morphology: LATH-SHAPED,EQUANT,AGGREGATES OCCURS IN AGGREGATES WITH CPX,SUBOPHITIC AND GRAPHIC INTERGROWTHS WITH CPX,ONE CLUSTER OF PLAG IS DEFINITELY PART OF A CUMULATE GABBRO WHICH CONTAINS OL,APPROX COMP AN50-70; CLINOPYROXENE ( 40%) Size(mm): 1-6 Morphology: IRREGULAR IRREGULAR XTLS AND INTERSTITIAL TO PLAG,APPROX COMP AUGITE; MAGNETITE ( 3%) Size(mm): <0.5 MICROCRYST GROUNDMASS ( 10%) INCLUDES PLAG + CPX + FE.MINS + MESOSTASIS,VERY FINE GRAINED MESOSTASIS COMPRISING PLAG MICROLITES + IRON ORE + POSSIBLY CPX (NOW COMPLETELY ALTERED),SURROUNDS GABBROIC-DOLERITIC FRAGMENTS* Alteration - CLAY MINERALS ( 10%) Location: INTERSTICES Replacing: MESOSTASIS MAINLY IN THE INTERSTICES REPLACING MESOSTASIS; ZEOLITE ( 15%) Location: INTERSTICES Replacing: MESOSTASIS,FEL MAINLY IN THE INTERSTICES REPLACING MESOSTASIS,THE ZEOLITES FORM RADIATING CLUSTERS IN 1-2 MM CAVITIES* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 930/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 355.00 Rock Type: IGNEOUS Core: 42 Sample Midpoint(m) : 358.93 Sect/Pc #: 3/PCE 3B ROCK = DOLERITE VERY ALTERED; Texture: SUBOPHITIC,INTERGRANULAR; Where sampled: OTHER SILL INTERIOR,CLOSE TO VEIN* Phenocrysts- PLAGIOCLASE LARGE (UP TO 5 MM) CPX AND PLAG INTERGROWTHS MAY BE PHENOCRYSTIC BUT ARE LISTED IN THE GROUNDMASS; CLINOPYROXENE LARGE (UP TO 5 MM) CPX AND PLAG INTERGROWTHS MAY BE PHENOCRYSTIC BUT ARE LISTED IN THE GROUNDMASS* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 40%) Size(mm): 0.5-2.5 Morphology: LATH-SHAPED APPROX COMP AN60-65; CLINOPYROXENE ( 20%) Size(mm): TO 4 Morphology: IRREGULAR APPROX COMP AUGITE,IRREGULAR ISOLATED XTLS SUBOPHITICALLY ENCLOSING PLAG LATHS,ALSO INTERGRANULAR; MAGNETITE ( 1%) Size(mm): TO 0.5 Morphology: ANHEDRAL ILMENITE ( 1%) Size(mm): TO 0.5 Morphology: ELONGATE Alteration - COMBINATION ( 35%) Location: INTERSTICES Replacing: MESOSTASIS,OL INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERSTICES BETWEEN LARGE CPX/PLAG INTERGROWTHS,REPLACING MESOSTASIS AND POSSIBLY OL* Leg : 64 Top/Bottom Interval(mm): 990/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 364.50 Rock Type: IGNEOUS Core: 43 Sample Midpoint(m) : 365.49 Sect/Pc #: 1/PCE 1G ROCK = DOLERITE TO GABBRO COARSE DOLERITE TO MICROGABBRO; Texture: PORPHYRITIC,OPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 5%) Size(mm): 0.75-1 Morphology: ANHEDRAL-SUBHEDRAL PLAGIOCLASE ( 20%) Size(mm): 0.75-1.5 Morphology: LATHS APPROX COMP AN55,SOME ZONED NORMALLY; CLINOPYROXENE ( 15%) Size(mm): 1.5-3 Morphology: ANHEDRAL-SUBHEDRAL APPROX COMP AUGITE,FRACTURED,OPHITICALLY ENCLOSING PLAG* Groundmass - OLIVINE ( 0%) PLAGIOCLASE ( 30%) Size(mm): 0.3-0.75 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 5%) Size(mm): 0.1-1 Morphology: ANHEDRAL APPROX COMP AUGITE; OPAQUE MINERALS ( 10%) INCLUDES MAGN + ILMENITE* Alteration - COMBINATION ( 15%) Location: INTERGRAIN Replacing: CPX Location: BOUNDARIES INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERGRAIN BOUNDARIES AND AFTER CPX,BROWNISH GREEN COLOR* Leg : 64 Top/Bottom Interval(mm): 700/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 364.50 Rock Type: IGNEOUS Core: 43 Sample Midpoint(m) : 366.70 Sect/Pc #: 2/PCE 1C ROCK = DOLERITE ALTERED; Texture: PORPHYRITIC,SUBOPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 7%) Size(mm): 0.5-1 Morphology: ANHEDRAL CORRODED; PLAGIOCLASE ( 15%) Size(mm): 1-3 Morphology: TABULAR LATHS,FEATHERED EDGES STRONG ZONING; CLINOPYROXENE ( 10%) Size(mm): 0.5-1 Morphology: ANHEDRAL APPROX COMP AUGITE,FRACTURED ALONG CLEAVAGE AND CORRODED* Groundmass - OLIVINE ( 10%) Size(mm): 0.1-0.5 PLAGIOCLASE ( 20%) Size(mm): 0.5-1 CLINOPYROXENE ( 20%) Size(mm): 0.1-0.5 MAGNETITE ( 3%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL Alteration - CARBONATE ( 5%) Location: VEINLETS COMBINATION ( 10%) Location: INTERGRAIN Replacing: GROUNDMASS,CPX,OL Location: BOUNDARIES INCLUDES CLAY.MIN + ZEOLITES,REPLACING OL IS QUESTIONABLE* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 680/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 364.50 Rock Type: IGNEOUS Core: 43 Sample Midpoint(m) : 369.68 Sect/Pc #: 4/PCE 2D ROCK = DOLERITE; Texture: PORPHYRITIC,SUBOPHITIC WAS OPHITIC BEFORE BREAKAGE OF CPX?; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 0%) PLAGIOCLASE ( 15%) Size(mm): 1-2 Morphology: LATHS STRONG ZONING (SOME REVERSE); CLINOPYROXENE ( 0%) Groundmass - OLIVINE ( 10%) Size(mm): 0.1-0.5 Morphology: ANHEDRAL PLAGIOCLASE ( 25%) Size(mm): 0.1-1 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 30%) Size(mm): 0.1-0.5 Morphology: ANHEDRAL,GRANULAR AGGREGATES APPROX COMP AUGITE,EXTENSIVELY FRACTURED; MAGNETITE ( 5%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL DISSEMINATED* Alteration - CARBONATE ( 5%) Location: VEINLETS FILLING VEINLETS; COMBINATION ( 10%) Location: INTERGRAIN Replacing: CPX,OL Location: BOUNDARIES INCLUDES CLAY.MIN + ZEOLITES* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 250/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 374.00 Rock Type: IGNEOUS Core: 44 Sample Midpoint(m) : 374.25 Sect/Pc #: 1/PCE 1C ROCK = DOLERITE TO GABBRO MICROGABBRO TO COARSE DOLERITE; Texture: PORPHYRITIC,OPHITIC CPX ENCLOSING PLAG (AT TIMES SUBOPHITIC); Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 30%) Size(mm): 1-1.5 Morphology: TABULAR LATHS APPROX COMP AN40,OPHITICALLY ENCLOSED IN CPX + SOME SUBOPHITIC PLAG AROUND SMALLER CPX; CLINOPYROXENE ( 20%) Size(mm): 1-3 Morphology: SUBHEDRAL-ANHEDRAL APPROX COMP AUGITE,AT TIMES FRACTURED BUT VERY FRESH* Groundmass - PLAGIOCLASE ( 15%) Size(mm): 0.1-1 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 15%) Size(mm): 0.1-1 Morphology: ANHEDRAL APPROX COMP AUGITE; MAGNETITE ( 5%) Alteration - COMBINATION ( 20%) Location: INTERGRAIN Replacing: CPX PHENOS,CPX Location: BOUNDARIES INCLUDES CLAY.MIN + ZEOLITES,REPLACING BOTH CPX PHENOS AND GROUNDMASS CPX* Leg : 64 Top/Bottom Interval(mm): 580/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 374.00 Rock Type: IGNEOUS Core: 44 Sample Midpoint(m) : 382.08 Sect/Pc #: 6/PCE 1B ROCK = DOLERITE ALTERED; Texture: PORPHYRITIC,OPHITIC-SUBOPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 0%) PLAGIOCLASE ( 20%) Size(mm): 1-1.5 Morphology: TABULAR LATHS APPROX COMP AN60,MOST SHOW NORMAL ZONING; CLINOPYROXENE ( 10%) Size(mm): 1-4 Morphology: SUBHEDRAL-ANHEDRAL APPROX COMP AUGITE* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 25%) Size(mm): 0.1-0.5 CLINOPYROXENE ( 10%) Size(mm): 0.1-0.5 OPAQUE MINERALS ( 5%) Size(mm): 0.1-0.3 Morphology: SUBHEDRAL-ANHEDRAL INCLUDES MAGN + ILMENITE* Alteration - CLAY MINERALS ( 15%) Location: INTERGRAIN Replacing: CPX Location: BOUNDARIES AFTER CPX; ZEOLITE ( 15%) Location: INTERGRAIN Location: BOUNDARIES Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 160/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 383.00 Rock Type: IGNEOUS Core: 45 Sample Midpoint(m) : 389.16 Sect/Pc #: 5/PCE 1A ROCK = CPX PHYRIC DOLERITE WEATHERED; Texture: PORPHYRITIC,POIKILITIC-OPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- CLINOPYROXENE ( 15%) Size(mm): 0.5-5 Morphology: ANHEDRAL APPROX COMP AUGITE* Groundmass - PLAGIOCLASE ( 40%) Size(mm): 0.5-1.5 Morphology: LATHS APPROX COMP AN50,SMALL LATHS ENCLOSED PARTLY OR TOTALLY WITHIN LARGE CPX,ZONED; OPAQUE MINERALS ( 5%) Size(mm): 0.1-0.5 INCLUDES MAGN + ILMENITE* Alteration - CLAY MINERALS ( 25%) Location: INTERGRAIN Replacing: CPX Location: BOUNDARIES BROWNISH GREEN; ZEOLITE ( 15%) Location: INTERGRAIN Location: BOUNDARIES Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 1080/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 383.00 Rock Type: IGNEOUS Core: 45 Sample Midpoint(m) : 390.08 Sect/Pc #: 5/PCE 1F ROCK = PLAG-CPX PHYRIC DOLERITE; Texture: PORPHYRITIC,OPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 20%) Size(mm): 0.5-1.5 Morphology: LATHS APPROX COMP AN45,WITHIN AND PROTRUDING FROM CPX; CLINOPYROXENE ( 15%) Size(mm): 1-5 Morphology: SUBHEDRAL-ANHEDRAL APPROX COMP AUGITE,CORRODED,APPEARS TO PARTIALLY ENCLOSE PLAG + OPHITICALLY ENCLOSE PLAG* Groundmass - OLIVINE ( 0%) PLAGIOCLASE ( 30%) Size(mm): >0.5 CLINOPYROXENE ( 10%) Size(mm): 0.5-1 Morphology: ANHEDRAL GRAINS APPROX COMP AUGITE,CORRODED AND ISOLATED FROM MOST PHENOS; OPAQUE MINERALS ( <5%) Size(mm): 0.2 Morphology: ANHEDRAL INCLUDES MAGN + ILMENITE,DISSEMINATED* Alteration - CLAY MINERALS ( 10%) Location: INTERGRAIN Replacing: CPX PHENOS Location: BOUNDARIES ZEOLITE ( 10%) Location: INTERGRAIN Location: BOUNDARIES Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 180/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 392.00 Rock Type: IGNEOUS Core: 46 Sample Midpoint(m) : 392.18 Sect/Pc #: 1/PCE 1D ROCK = PLAG-CPX PHYRIC DOLERITE TO GABBRO COARSE DOLERITE TO MICROGABBRO; Texture: PORPHYRITIC,OPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 40%) Size(mm): 1-2.5 Morphology: TABULAR LATHS APPROX COMP AN44,SOME NORMAL ZONING; CLINOPYROXENE ( 20%) Size(mm): 2-5 Morphology: SUBHEDRAL APPROX COMP AUGITE,MOSTLY VERY FRESH* Groundmass - PLAGIOCLASE ( 15%) Size(mm): 0.5-1 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 5%) Size(mm): <2 Morphology: ANHEDRAL APPROX COMP AUGITE,PROBABLY FRAGMENTS OF LARGER CPX; OPAQUE MINERALS ( 5%) Size(mm): 0.25-0.75 Morphology: EUHEDRAL-SUBHEDRAL INCLUDES MAGN + ILMENITE,LARGE EUHEDRAL-SUBHEDRAL, DISSEMINATED* Alteration - CARBONATE ( 0%) CLAY MINERALS ( 10%) Location: INTERGRAIN Replacing: CPX Location: BOUNDARIES AFTER SOME CPX; ZEOLITE ( 5%) Location: INTERGRAIN Location: BOUNDARIES Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 750/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 392.00 Rock Type: IGNEOUS Core: 46 Sample Midpoint(m) : 397.25 Sect/Pc #: 4/PCE 1C ROCK = PLAG-CPX PHYRIC DOLERITE; Texture: PORPHYRITIC,OPHITIC,INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE ( 30%) Size(mm): 0.5-1.5 Morphology: TABULAR LATHS APPROX COMP AN50,MINOR NORMAL ZONING; CLINOPYROXENE ( 20%) Size(mm): 0.5-4 Morphology: ANHEDRAL APPROX COMP AUGITE,PHENOCRYST FRAGMENTS* Groundmass - OLIVINE ( 5%) Size(mm): <0.5 Morphology: ANHEDRAL PLAGIOCLASE ( 30%) Size(mm): 0.1-0.5 Morphology: LATHS SMALL LATHS,INTERGRANULAR; OPAQUE MINERALS ( <5%) Size(mm): 0.1-0.25 Morphology: SUBHEDRAL-ANHEDRAL INCLUDES MAGN + ILMENITE,DISPERSED* Alteration - COMBINATION ( 10%) Location: INTERGRAIN Replacing: CPX Location: BOUNDARIES INCLUDES CLAY.MIN + ZEOLITES* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 100/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 412.00 Rock Type: IGNEOUS Core: 49 Sample Midpoint(m) : 415.10 Sect/Pc #: 3/PCE 1B ROCK = DOLERITE; Texture: SUBOPHITIC-OPHITIC,INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE LARGE CPX + PLAG INTERGROWTHS MAY BE PHENOS BUT THEY ARE LISTED IN THE GROUNDMASS FIGURES; CLINOPYROXENE LARGE CPX + PLAG INTERGROWTHS MAY BE PHENOS BUT THEY ARE LISTED IN THE GROUNDMASS FIGURES* Groundmass - OLIVINE ( 5%) Size(mm): 0.4-1.0 Morphology: ANHEDRAL SURROUNDED BY CLAY.MIN; PLAGIOCLASE ( 45%) Size(mm): 0.4-1.5 Morphology: LATH-SHAPED OCCURS IN PYX AND SEPARATELY; CLINOPYROXENE ( 45%) Size(mm): TO 4 Morphology: IRREGULAR APPROX COMP AUGITE,LARGE OPHITICALLY CONTINUOUS AGGREGATES AND SMALLER INTERGRANULAR XTLS; OPAQUE MINERALS ( 2%) Size(mm): TO 1 Morphology: SKELETAL INCLUDES MAGN + ILMENITE,SKELETAL AND FRAGMENTED* Alteration - CLAY MINERALS ( 5%) Location: INTERSTITIAL Replacing: MESOSTASIS,OL,MICAS REPLACING MESOSTASIS AND MICAS IS QUESTIONABLE* Leg : 64 Top/Bottom Interval(mm): 550/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 419.00 Rock Type: IGNEOUS Core: 50 Sample Midpoint(m) : 425.55 Sect/Pc #: 5/PCE 1D ROCK = DOLERITE; Texture: OPHITIC-POIKILITIC,INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Groundmass - OLIVINE ( 5%) Size(mm): 0.3-1.0 Morphology: ANHEDRAL SOME ENCLOSED IN CPX; PLAGIOCLASE ( 50%) Size(mm): 0.3-2.0 Morphology: LATH-SHAPED,TABULAR APPROX COMP AN55-60; CLINOPYROXENE ( 40%) Size(mm): 0.3-5.0 Morphology: ANHEDRAL LARGE ANHEDRAL XTLS ENCLOSING PLAG + RARE OL AND ALSO SMALLER INTERGRANULAR XTLS; OPAQUE MINERALS ( 1%) Size(mm): 0.1-0.3 Morphology: IRREGULAR INCLUDES MAGN + ILMENITE* Alteration - CLAY MINERALS ( 5%) Location: INTERSTITIAL Replacing: MESOSTASIS,OL Leg : 64 Top/Bottom Interval(mm): 480/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS Core: 51 Sample Midpoint(m) : 431.48 Sect/Pc #: 3/PCE 1D ROCK = GABBRO; Texture: OPHITIC WITH 10% MESOSTASIS; Where sampled: OTHER XENOLITH IN DOLERITE SILL* Groundmass - OLIVINE ( 5%) Size(mm): 1-2 Morphology: ROUNDED,ANHEDRAL PARTLY ALTERED; PLAGIOCLASE ( 30%) Size(mm): 0.5-3 Morphology: LATH-SHAPED ENCLOSED IN PLAG; CLINOPYROXENE ( 55%) Size(mm): 1-10 Morphology: ANHEDRAL APPROX COMP AUGITE,OPHITICALLY ENCLOSES PLAG; ILMENITE ( 3%) Size(mm): 0.5-1.0 Morphology: ELONGATE POSSIBLY TITAN.MT* Alteration - CLAY MINERALS ( 5%) Location: INTERSTICES Replacing: MESOSTASIS,OL ZEOLITE ( 5%) Location: INTERSTICES Replacing: MESOSTASIS,FEL RARELY REPLACING FEL* Leg : 64 Top/Bottom Interval(mm): 1110/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS Core: 51 Sample Midpoint(m) : 432.11 Sect/Pc #: 3/PCE 1I ROCK = DOLERITE; Texture: OPHITIC-INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE LARGE CPX/PLAG INTERGROWTHS MAY BE PHENOS BUT ARE INCLUDED IN THE GROUNDMASS FIGURES; CLINOPYROXENE LARGE CPX/PLAG INTERGROWTHS MAY BE PHENOS BUT ARE INCLUDED IN THE GROUNDMASS FIGURES* Groundmass - OLIVINE ( 10%) Size(mm): 0.5-1.0 Morphology: ROUNDED,ANHEDRAL OCCASIONALLY ENCLOSED IN CPX; PLAGIOCLASE ( 50%) Size(mm): 0.5-1.5 Morphology: LATH-SHAPED OCCASIONALLY ENCLOSED IN CPX; CLINOPYROXENE ( 30%) Size(mm): 1-6 APPROX COMP AUGITE?;LARGE XTLS WITH OPHITIC PLAG AND SMALLER INTERGRANULAR XTLS; MAGNETITE ( 5%) Size(mm): TO 1 Morphology: SKELETAL APPROX COMP TITAN.MT?,RESORBED XTLS* Alteration - CLAY MINERALS ( 5%) Location: INTERSTICES Replacing: MESOSTASIS,OL REPLACING MESOSTASIS IS QUESTIONABLE* Leg : 64 Top/Bottom Interval(mm): 300/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS Core: 51 Sample Midpoint(m) : 432.80 Sect/Pc #: 4/PCE 1B ROCK = GABBRO; Texture: OPHITIC-SUBOPHITIC; Where sampled: OTHER XENOLITH INSIDE DOLERITIC SILL* Phenocrysts- PLAGIOCLASE ( 30%) Size(mm): 1-3 Morphology: TABULAR LATHS,RADIATING FIBER TABULAR LATHS AND QUENCHED MICROLITES WITH RADIATING FIBERS; CLINOPYROXENE ( 15%) Size(mm): 1-4 Groundmass - OLIVINE ( 4%) Size(mm): 0.5-1 Morphology: ROUNDED,ANHEDRAL ROUNDED ANHEDRAL GRAINS,REPLACED BY CLAY IN PLACES; PLAGIOCLASE ( 30%) Size(mm): 0.2-1 Morphology: LATHS,ROUND,RADIATING FIBERS ROUND MICROLITES WITH RADIATING FIBERS,SOME QUENCH TEXTURED MICROLITES + SMALL LATHS; CLINOPYROXENE ( 5%) Size(mm): 0.2-0.5 APPROX COMP AUGITE; OPAQUE MINERALS ( 10%) Size(mm): 0.25-6 Morphology: TABULAR,SUBHEDRAL INCLUDES MAGN + ILMENITE,LARGE AND LONG (4-6 MM) NEEDLES* Alteration - COMBINATION ( 10%) Location: INTERGRAIN Replacing: CPX Location: BOUNDARIES INCLUDES BROWNISH GREEN CLAY.MIN + CLEAR FIBROUS ZEOLITES,AFTER CPX* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 1130/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS Core: 51 Sample Midpoint(m) : 436.63 Sect/Pc #: 6/PCE 1H ROCK = DOLERITE; Texture: OPHITIC; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE CPX + PLAG AGGREGATES MAY BE PHENOS BUT ARE INCLUDED IN THE GROUNDMASS FIGURES; CLINOPYROXENE CPX + PLAG AGGREGATES MAY BE PHENOS BUT ARE INCLUDED IN THE GROUNDMASS FIGURES* Groundmass - OLIVINE ( 4%) Size(mm): 0.5-1 Morphology: ANHEDRAL,ROUNDED SHOWING ALTERATION TO CLAY; PLAGIOCLASE ( 55%) Size(mm): 0.5-3 Morphology: LATH-SHAPED USUALLY ENCLOSED IN CPX; CLINOPYROXENE ( 35%) Size(mm): 1-5 Morphology: IRREGULAR,AGGREGATES APPROX COMP AUGITE,LARGE IRREGULAR XTLS AND OPTICALLY CONTINUOUS AGGREGATES; MAGNETITE ( 1%) Size(mm): 0.3 Morphology: IRREGULAR,SUBHEDRAL Alteration - CLAY MINERALS ( 5%) Location: INTERGRANULAR Replacing: MESOSTASIS,OL,FEL REPLACING MESOSTASIS IS QUESTIONABLE,INCIPIENT ALTERATION OF FELSPARS* Leg : 64 Top/Bottom Interval(mm): 850/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 437.00 Rock Type: IGNEOUS Core: 52 Sample Midpoint(m) : 445.35 Sect/Pc #: 6/PCE 1D ROCK = DOLERITE; Texture: SUBOPHITIC-INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE LARGE PLAG-CPX INTERGROWTHS MAY BE PHENOS; CLINOPYROXENE LARGE PLAG-CPX INTERGROWTHS MAY BE PHENOS* Groundmass - OLIVINE ( 5%) Size(mm): 0.3-0.6 Morphology: ROUNDED,ANHEDRAL PARTIAL ALTERATION TO CLAY; PLAGIOCLASE ( 40%) Size(mm): 0.5-1.5 Morphology: LATH-SHAPED LARGER ONES TEND TO BE IN CPX; CLINOPYROXENE ( 20%) Size(mm): 0.3-3 LARGER CPX CONTAIN PLAG (OPHITIC),ALSO SOME INTERGRANULAR CPX; MAGNETITE ( 3%) Size(mm): 0.3-0.5 Morphology: ANHEDRAL,SKELETAL Alteration - CLAY MINERALS ( 30%) Location: INTERSTITIAL Replacing: MESOSTASIS,OL REPLACING MESOSTASIS IS QUESTIONABLE,GREEN* Leg : 64 Top/Bottom Interval(mm): 280/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 446.00 Rock Type: IGNEOUS Core: 53 Sample Midpoint(m) : 450.78 Sect/Pc #: 4/PCE 1B ROCK = APHYRIC BASALT OR DOLERITE; Texture: APHYRIC,INTERGRANULAR-DOLERITIC,COARSE; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE ( <1%) Size(mm): 2 Morphology: TABULAR ZONED* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 50%) Size(mm): 0.3-1.5 Morphology: LATH-SHAPED APPROX COMP AN55-60,LATH-SHAPED AND INTERSTITIAL, FRESH; CLINOPYROXENE ( 30%) Size(mm): 0.2-1.5 Morphology: IRREGULAR,ANHEDRAL APPROX COMP AUGITE,SUBOPHITIC AND INTERGRANULAR; OPAQUE MINERALS ( 4%) Size(mm): 0.1-0.5 Morphology: CUBOID-SKELETAL INCLUDES MAGN + ILMENITE,INTERGRANULAR* Alteration - CLAY MINERALS ( 10%) Location: INTERGRANULAR Replacing: MESOSTASIS REPLACING MESOSTASIS IS QUESTIONABLE,BROWN, ORE-RICH; MICA ( 5%) Location: INTERGRANULAR BIOTITE?,NOT KNOWN WHAT IS BEING REPLACED* Leg : 64 Top/Bottom Interval(mm): 760/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 455.76 Sect/Pc #: 1/PCE 4B ROCK = CPX-OL PHYRIC BASALT; Texture: PORPHYRITIC,INTERSERTAL,MEDIUM-GRAINED; Where sampled: OTHER LOWER MARGIN OF SILL* Phenocrysts- OLIVINE ( 10%) Size(mm): <0.5 Morphology: SUBHEDRAL-ANHEDRAL MICROPHENOS; CLINOPYROXENE ( 10%) Size(mm): <0.5 Morphology: SUBHEDRAL-ANHEDRAL MICROPHENOS* Groundmass - PLAGIOCLASE ( 30%) Size(mm): 0.3 Morphology: LATHS SMALL LATHS; OPAQUE MINERALS ( <5%) INCLUDES MAGN + ILMENITE* Alteration - CLAY MINERALS ( 45%) Replacing: GLASS Leg : 64 Top/Bottom Interval(mm): 500/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 457.00 Sect/Pc #: 2/PCE 1B ROCK = APHYRIC BASALT BADLY ALTERED; Texture: APHYRIC,INTERSERTAL-INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 25%) Size(mm): 0.1-0.5 Morphology: LATHS SHORT SMALL LATHS; CLINOPYROXENE ( 20%) Size(mm): 0.1-0.6 APPROX COMP AUGITE,SMALL INTERGRANULAR XTLS AND LARGER OPHITIC XTLS ENCLOSING SOME PLAG; OPAQUE MINERALS ( 5%) Size(mm): <0.1 Morphology: ANHEDRAL INCLUDES MAGN + ILMENITE* Alteration - OTHER ( 50%) Location: INTERSTITIAL Replacing: IRREGULAR A VOID WHICH WAS PROBABLY CLAY.MIN NOW LOST BY THIN SECTION PREPARATION* Leg : 64 Top/Bottom Interval(mm): 820/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 457.32 Sect/Pc #: 2/PCE 3A ROCK = CPX-OL-PLAG PHYRIC BASALT; Texture: PORPHYRITIC,EQUIGRANULAR,FINE-GRAINED; Where sampled: OTHER SILL CONTACT* Phenocrysts- OLIVINE ( 5%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL POSSIBLY CPX (TOO SMALL TO SEE),MICROPHENOS; PLAGIOCLASE ( <3%) Size(mm): 0.5 Morphology: LATHS MICROPHENOS,BLOCKY INTERGROWN LATHS,ZONED,IN LOWER UNIT; CLINOPYROXENE ( 10%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL MICROPHENOS* Groundmass - PLAGIOCLASE ( 50%) Size(mm): <0.1 Morphology: LATHS SMALL TINY LATHS IN MESOSTASIS; OPAQUE MINERALS ( 5%) INCLUDES MAGN + ILMENITE; GLASS ( <5%) Alteration - COMBINATION ( 30%) Location: MESOSTASIS INCLUDES CLAY.MIN + ZEOLITES* Vesicles - Percent: 0 Leg : 64 Top/Bottom Interval(mm): 1000/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 457.50 Sect/Pc #: 2/PCE 4A ROCK = APHYRIC BASALT; Texture: APHYRIC,INTERGRANULAR-INTERSERTAL; Where sampled: OTHER SILL MARGIN* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 30%) Size(mm): 0.2-1.0 Morphology: ELONGATE LATHS APPROX COMP AN60-65; CLINOPYROXENE ( 30%) Size(mm): 0.3-1.0 Morphology: IRREGULAR APPROX COMP AUGITE,OPTICALLY CONTINUOUS XTLS, LARGER XTLS SUBOPHITICALLY ENCLOSE PLAG; MAGNETITE ( 2%) Size(mm): 0.1-0.2 Morphology: CUBOID-SUBHEDRAL APPROX COMP TITAN.MT,INTERGRANULAR MESOSTASIS ( 40%) APHANITIC,ALTERED* Alteration - COMBINATION ( 40%) Location: INTERGRANULAR Replacing: MESOSTASIS INCLUDES CLAY.MIN + ZEOLITES* Leg : 64 Top/Bottom Interval(mm): 1300/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 457.80 Sect/Pc #: 2/PCE 4D ROCK = APHYRIC BASALT; Texture: APHYRIC,INTERSERTAL-INTERGRANULAR; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE ( <1%) Size(mm): 1 Morphology: ANHEDRAL RESORBED,ZONED* Groundmass - PLAGIOCLASE ( 35%) Size(mm): 0.3-1.5 Morphology: LATHS CLINOPYROXENE ( 30%) Size(mm): 0.2-0.6 Morphology: ANHEDRAL APPROX COMP AUGITE?,SOME LARGER XTLS SUBOPHITICALLY ENCLOSE PLAG; MAGNETITE ( 1%) Size(mm): <0.3 Morphology: CUBOID-ELONGATE Alteration - CARBONATE ( 1%) Location: VESICLES Replacing: MESOSTASIS CALCITE IN VESICLES,POSSIBLY SOME CARB IN MESOSTASIS REPLACEMENT; CLAY MINERALS ( 30%) Location: INTERSTICES Replacing: MESOSTASIS,CPX SOME ALTERATION OF CPX?,GREEN CLAY* Vesicles - Size(mm): 1.0-1.5 Percent: 1 Location: RANDOM Filling: CALCITE Shape: SPHERICAL Leg : 64 Top/Bottom Interval(mm): 10/ 0 Describer: Saunders, A. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 458.01 Sect/Pc #: 3/PCE 1A ROCK = PLAG SPARSELY PHYRIC BASALT; Texture: SPARSELY PORPHYRITIC,INTERGRANULAR-INTERSERTAL; Where sampled: OTHER SILL INTERIOR* Phenocrysts- PLAGIOCLASE ( 1%) Size(mm): 2.5-3.0 Morphology: LATH-SHAPED SLIGHTLY ZONED,RESORBED* Groundmass - OLIVINE ( 0%) NONE SEEN; PLAGIOCLASE ( 30%) Size(mm): 0.2-1.0 Morphology: LATH-SHAPED APPROX COMP AN60-65; CLINOPYROXENE ( 20%) Size(mm): 0.2-0.6 Morphology: ANHEDRAL APPROX COMP AUGITE,MORE OR LESS EQUIDIMENSIONAL WITH PLAG* Alteration - CLAY MINERALS ( 50%) Location: INTERGRANULAR Replacing: MESOSTASIS,CPX GREENISH; PYRITE ( <1%) Location: VEIN Leg : 64 Top/Bottom Interval(mm): 00/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 459.50 Sect/Pc #: 4/PCE 1A ROCK = CPX MODERATELY PHYRIC BASALT SIMILAR TO PIECE 1B OF THIS SECTION (SEE DESCRIPTION)--PERHAPS A LITTLE MORE ALTERED; Texture: MODERATELY PORPHYRITIC,INTERSERTAL-APHYRIC; Where sampled: OTHER SILL MARGIN* Phenocrysts- CLINOPYROXENE ( 5%) Size(mm): 0.5-1.5 Morphology: ANHEDRAL Groundmass - OLIVINE ( 5%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL POSSIBLY ALL CPX?; PLAGIOCLASE ( 15%) Size(mm): <0.5 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 5%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL OPAQUE MINERALS ( 5%) Size(mm): 0.1-0.2 INCLUDES MAGN + ILMENITE,DISPERSED; GLASS ( 65%) TOTALLY ALTERED TO CLAY.MIN + ZEOLITES* Alteration - COMBINATION ( 65%) Location: MESOSTASIS Replacing: GLASS INCLUDES CLAY.MIN + ZEOLITES* Leg : 64 Top/Bottom Interval(mm): 500/ 0 Describer: Fornari, D. Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS Core: 54 Sample Midpoint(m) : 460.00 Sect/Pc #: 4/PCE 1B ROCK = CPX MODERATELY PHYRIC BASALT; Texture: MODERATELY PORPHYRITIC,INTERSERTAL-APHYRIC; Where sampled: OTHER SILL MARGIN* Phenocrysts- CLINOPYROXENE ( 5%) Size(mm): 0.5-1.5 Morphology: ANHEDRAL Groundmass - OLIVINE ( 5%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL POSSIBLY ALL CPX?; PLAGIOCLASE ( 15%) Size(mm): <0.5 Morphology: LATHS SMALL LATHS; CLINOPYROXENE ( 5%) Size(mm): 0.1-0.3 Morphology: ANHEDRAL OPAQUE MINERALS ( 5%) Size(mm): 0.1-0.2 INCLUDES MAGN + ILMENITE,DISPERSED; GLASS ( 65%) TOTALLY ALTERED TO CLAY.MIN + ZEOLITES* Alteration - COMBINATION ( 65%) Location: MESOSTASIS Replacing: GLASS INCLUDES CLAY.MIN + ZEOLITES* |
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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