Leg : 31 Top/Bottom Interval(mm): 750/ 850 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 242.30 Sect/Pc #: 1/PCE 1 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* CLASTS MAKE UP 40-50% OF SAMPLE; Groundmass - DEVITRIFIED GLASS ( 12%) Morphology: COLLOIDALLY BUNDLED PALE BROWN(PALAGONITE?),PARTLY ALTERED TO GREEN+ BROWN CHLORITE MATERIAL,SOME WITH RECTANGULAR VOIDS(AFTER FELDSPAR)AND ONE HEXAGONAL AFTER OL; GLASS ( 25%) NEARLY OPAQUE DARK BROWN GLASS WITH FELDSPAR MICROLITES,SOME SHOWING VARIOLITIC TEXTURE; OTHER ( 7%) BASALTIC VOLCANIC ROCKS WITH MICROLITES OR SMALL LATHS OF FELDSPAR,ALL RATHER ALTERED+TURBID,A FEW WITH FRESH PYX(SUBOPHITIC TEXTURE); PYROXENE ( 1%) A FEW XTLS OF PYX+ONE GRAIN MICRITE LIMESTONE; MATRIX ( 50%) FINE CLAY SIZED,MAINLY TURBID,WHITE REFLECTING, ISOTROPIC,WITH A FEW IDENTIFIABLE COCCOLITHS+ DISCOASTERS* Vesicles - Percent: 10 Filling: CHALCEDONY Shape: IRREGULAR, Shape: RECTANGULAR VOIDS FILLED WITH RADIATING CHALCEDONY(ID UNCERTAIN-MIGHT BE ZEOLITE)* Leg : 31 Top/Bottom Interval(mm): 750/ 850 Describer: Moore, C. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 242.30 Sect/Pc #: 1/PCE 1 ROCK = VOLCANIC CONGLOMERATE; Texture: COARSE-GRAINED* Groundmass - GRAINS (40-50%) Size(mm): .2-1.6 Morphology: ANGULAR-SUBANGULAR VERY IRREGULAR SHAPES(LOW SPHERICITY),AVERAGE GRAIN SIZE IS .6MM,NO SIZE OR COMPOSITIONAL GRADING APPARENT,SOME ELONGATE GRAINS ORIENTED PARALLEL IN HORIZONTAL,AVERAGE GRAIN SIZE COARSE, SAND GRAINS MODERATELY SORTED* MATRIX (50-60%) GENERAL OPEN FRAMEWORK; Leg : 31 Top/Bottom Interval(mm): 1400/1500 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 242.95 Sect/Pc #: 1/PCE 8 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* Groundmass - CLASTS ( 50%) Size(mm): .3-2 AVERAGE SIZE 1MM; OTHER ( 40%) BROWN,TURBID,MAINLY SEMI-OPAQUE LIMONITIC ALTERED BASALT; DEVITRIFIED GLASS ( 9%) Morphology: COLLOIDAL BUNDLING PALE BROWN(RARELY GREEN),PALAGONITIC,PARTLY ALTERED TO CHLORITIC MATERIAL; PLAGIOCLASE+PYROXENE ( 1%) SMALL RARE XTLS OF PYX+PLAG,ONE CLAST OF REDDISH BROWN MUDSTONE?,WITH CIRCULAR AREAS POSSIBLY AFTER RADIOLARIA* Leg : 31 Top/Bottom Interval(mm): 1400/1500 Describer: Moore, C. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 242.95 Sect/Pc #: 1/PCE 8 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC,COARSE-GRAINED* Groundmass - CLASTS ( 50%) PARTICLES ANGULAR WITH LOW SPHERICITY,NO SIZE OR COMPOSITIONAL GRADING,CLASTS COARSE TO VERY COARSE,SANDY CLASTS MODERATELY SORTED,NO APPARENT ORIENTATION OF CLASTS; MATRIX ( 50%) GENERAL OPEN FRAMEWORK,FEW NANNOS IN MATRIX* Leg : 31 Top/Bottom Interval(mm): 1400/1500 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 244.45 Sect/Pc #: 2/PCE 21 ROCK = VOLCANIC CONGLOMERATE; Groundmass - OTHER LARGE BASALT CLAST(>50MM)-MICROXTLLINE+ MICROPORPHYRITIC:; PLAGIOCLASE ( 15%) Size(mm): TO 2 Morphology: ELONGATE MICROPHENO(MICROPHENOS MAKE UP 30% OF CLAST), ALBITE+CARLSBAD TWINNING,OSCILLATORY ZONING, APPROX COMP LABRADORITE(AN58) BY MICHEL-LEVY METHOD; PYROXENE ( 1%) Size(mm): TO . Morphology: 6 PROBABLY AUGITE; OLIVINE ( 4%) Size(mm): TO . Morphology: 4EUHEDRAL COMPLETELY ALTERED TO BROWN CHLORITE MATERIAL (DOUBLY TERMINATED HEXAGONAL PRISMS),CLEAR; GROUNDMASS ( 60%) GROUNDMASS IS COMPOSED OF GLASS+PLAG+MICROLITES+ AUGITE+CHLORITE,FOLLOWING IS DESCRIPTION OF REST OF ROCK (AROUND BASALT CLAST); CLASTS ( 40%) FINE GRAINED PARTLY GLASSY BASALT(25%,POSSIBLY SPILITIC)MOSTLY ALTERED AND OPAQUE,REFLECTING YELLOWISH BROWN(LIMONITIC)+YELLOW PALAGONITE AND MIXTURES OF PALAGONITE,ZEOLITE,CALCITE AND ALTERED BASALT(15%); MATRIX ( 60%) MAINLY PALE BROWN MICRITE(PROBABLY DOLORITIC) WITH ZEOLITE AND A FEW PALER,LARGER XTLS OF CALCITE, PROBABLY SOME DISPERSED CLAY* Alteration - PALAGONITE Location: CLASTS ZEOLITE Location: CLASTS,MATRIX CALCITE Location: CLASTS,MATRIX CLAY MINERALS Location: MATRIX Leg : 31 Top/Bottom Interval(mm): 1400/1500 Describer: Moore, C. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 244.45 Sect/Pc #: 2/PCE 21 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC,VERY COARSE GRAINED; Where sampled: AREA ADJACENT TO LARGE BASALT FRAGMENT* Groundmass - CLASTS ( 40%) ANGULAR,VERY COARSE GRAINED(COARSE SAND,GRANULE+ FINE PEBBLE SIZE,1-5MM),MODERATELY SORTED; MATRIX ( 60%) OPEN FRAMEWORK,MATRIX OF REXTLLIZED CARBONATE* Alteration - CARBONATE Location: MATRIX Leg : 31 Top/Bottom Interval(mm): 300/ 350 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: IGNEOUS Core: 8 Sample Midpoint(m) : 244.83 Sect/Pc #: 3/PCE 5 ROCK = VOLCANIC BASALT ALTERED (LIMONITIC); Texture: MEROCRYSTALLINE,VARIOLITIC,MICROPHYRIC, INTERSERTAL,HOLOXTALLINE (DIABASIC),SUBOPHITIC THIS IS SLIDE A* Groundmass - MATRIX LARGELY ISOTROPIC WITH APPROX 40% CARBONATE IN SMALL(.01MM)IRREGULAR GRAINS,WITH SOME DISPERSED CLAY* Alteration - CALCITE CARBONATE ( 40%) Location: MATRIX CLAY MINERALS Location: MATRIX Leg : 31 Top/Bottom Interval(mm): 300/ 351 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 244.83 Sect/Pc #: 3/PCE 5 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC; THIS IS SLIDE B Groundmass - CLASTS ( 45%) CONSISTS OF BASALT (30%)+PALAG(10%)+ZEOLITE/ CALCITE MIXTURE(5%); MATRIX SIMILAR TO SLIDE A,APPEARS TO BE BOTH CHLORITIC (FINE TO TURBID,LIGHT BROWN IRREGULAR GRAINS) AND CALCITE(LARGER,CLEARER,COLORLESS)* Alteration - CHLORITE Location: MATRIX Leg : 31 Top/Bottom Interval(mm): 300/ 380 Describer: Moore, C. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 244.84 Sect/Pc #: 3/PCE 5 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* Groundmass - CLASTS ( 45%) Size(mm): 2-3 Morphology: ANGULAR AVERAGE SIZE IS GIVEN(MAX. SIZE IS 1CM),SORTING MODERATE; MATRIX ( 55%) OPEN FRAMEWORK,REXTLLIZED CARBONATE WITH SOME RODS +SPICULES* Alteration - CARBONATE Location: MATRIX Leg : 31 Top/Bottom Interval(mm): 560/ 640 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 246.60 Sect/Pc #: 4/PCE 11 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* Groundmass - CLASTS ( 50%) ONE LARGE(18MM)ANGULAR CLAST OF BASALT,MICROPHYRIC WITH A MEROXTLLINE,INTERSERTAL GROUNDMASS,PHENOS ARE BASIC PLAG AND PYX? COMPLETELY ALTERED TO GREEN CHLORITE(BLUE BIREFRINGENCE) AND PALE GREEN BIOTITE(PLEOCHROIC,MODERATE(2ND ORDER) BIREFRINGENCE),ABUNDANT BLACK OR DUST IN THE GLASSY MATRIX,THE REMAINING CLASTS ARE MEROXTLLINE BASALTS(MOSTLY ALTERED AND LIMONITIC),PALAGONITE (COLLOIDALLY BUNDLED AND ENCLOSING ALTERED EUHEDRAL FELDSPAR + FRESH AUGITE),SOME HOLOXTLLINE,COARSER BASALT(TRANSITIONAL TO MICROGABBRO)AND A FEW GRANULES OF MICROGABBRO (=DIABASE),ONE GRANULE IS A SPHERULITIC AGGREGATE OF BROWN CHLORITE; MATRIX ( 50%) MATRIX CONSISTS OF CARBONATE MICRITE(30%),PROBABLY DOLOMITE,WITH ISOTROPIC ZEOLITE OR GLASS,+PERHAPS SOME CLAY,A CONSPICUOUS FRACTURE OF THE GROUNDMASS (ALSO SEEN IN HAND SPECIMEN)IS OPAQUE CIRCULAR PATCHES AND APPROX .1MM CHAIN BLACK REFLECTING, PRESUMABLY SECONDARY,CONCENTRATIONS OF MANGANESE* Leg : 31 Top/Bottom Interval(mm): 560/ 640 Describer: Moore, C. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 246.60 Sect/Pc #: 4/PCE 11 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* Groundmass - CLASTS ( 50%) Size(mm): 4 Morphology: ANGULAR AVERAGE SIZE IS GIVEN,MAX.SIZE IS 6CM; MATRIX ( 50%) REXTLLIZED CARBONATE,GENERALLY OPEN FRAMEWORK BUT SOME GRAINS WITH ONE OR MORE CONTACTS WITH ADJACENT GRAINS,ASSUMING MATRIX WAS CORE SORTING IS VERY POOR* Leg : 31 Top/Bottom Interval(mm): 0/ 0 Describer: MacGregor, I. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 247.50 Sect/Pc #: 5/ ROCK = BASALT VOLCANICLASTIC CONGLOMERATE, LOCATION IN SECTION UNKNOWN, CONTACT WITH CONGLOMERATE VERY SHARP - NO ALTERATION RIMS, ALL FRAGMENTS IN CONGLOMERATE ARE VOLCANIC AND COMPOSED OF VERY FINE-GRAINED GLASSY TO QUENCH CRYSTALS; Texture: SUBOPHITIC SUBOPHITIC INTERGROWTH OF TABULAR PLAG IN GRANULAR CPX* Groundmass - PLAGIOCLASE ( 60%) Size(mm): 0.3X0.050 Morphology: TABULAR CLINOPYROXENE ( 35%) Size(mm): 0.1 Morphology: GRANULAR OPAQUE MINERALS ( 5%) Size(mm): 0.05 Morphology: EUHEDRAL SMALL SCATTERED OPAQUE PHASES* Alteration - SERPENTINITE SMALL PATCHES BROWN SERP ALTERATION; CALCITE 0.005-0.10 MM, GRANULAR INTERGROWTH WITH LOW BIREFRINGENCE OPALINE SILICA; SILICA LOW BIREFRINGENCE OPALINE SILICA, MATRIX OF CONGLOMERATE IS VERY FINE-GRAINED INTERGROWTH OF CALCITE AND SILICA* Leg : 31 Top/Bottom Interval(mm): 1420/1500 Describer: Haile, N. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 248.96 Sect/Pc #: 5/PCE 22 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* Groundmass - CLASTS ( 45%) INCLUDES MICROPHYRIC MEROXTLLINE BASALT,APHYRIC MEROXTLLINE BASALT,GLASSY BASALT WITH FELDSPAR MICROLITES,SUBOPHITIC HOLOXTLLINE BASALT,PALE BROWN PALAGONITE AND AGGREGATES OF FRAGMENTED PALAGONITE+ZEOLITE; MATRIX ( 55%) COMPOSED OF CLAY,CARBONATES AND ZEOLITES,CIRCULAR OPAQUE PATCHES .1MM DIAMETER ARE PROBABLY MANGANESE* Alteration - CLAY MINERALS ( 5%) Location: MATRIX ZEOLITE ( 30%) Location: MATRIX,VOIDS Replacing: EUHEDRAL Replacing: PRISMS POSSIBLY CLINOPTILOLITE-FROM GENERAL"CROSS" HABIT; CARBONATE ( 20%) Location: MATRIX INCLUDES DOLOMITE(80%) +CALCITE(20%)* Leg : 31 Top/Bottom Interval(mm): 1420/1500 Describer: Moore, C. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: SEDIMENTARY Core: 8 Sample Midpoint(m) : 248.96 Sect/Pc #: 5/PCE 22 ROCK = VOLCANIC CONGLOMERATE; Texture: CLASTIC* Groundmass - MATRIX ( 55%) OPEN FRAMEWORK,MODERATE-POOR SORTING(MATRIX PROBABLY WAS BIOGENIC OOZE SO TOTAL ROCK POORLY TO VERY POORLY SORTED),CALCITE STAIN SUGGESTS THAT CARBONATE MATRIX PARTIALLY DOLOMITIZED+SILICIFIED; CLASTS ( 45%) Size(mm): 4-5 Morphology: ANGULAR MAX.SIZE<1.5CM,AVERAGE SIZE GIVEN* Alteration - CARBONATE Location: MATRIX CALCITE Location: MATRIX Leg : 31 Top/Bottom Interval(mm): 0/ 0 Describer: Meijer, A. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: IGNEOUS Core: 8 Sample Midpoint(m) : 249.10 Sect/Pc #: CC/ ROCK = BASALT; Texture: MEDIUM-GRAINED,INTERSERTAL,SUB-OPHITIC* Groundmass - PLAGIOCLASE ( 35%) Size(mm): 0.2-0.5 Morphology: ZONED,TWINNED,ACICULAR FRESH,GRAINS,PARTIALLY ENCLOSED BY PYX; CLINOPYROXENE ( 30%) Size(mm): 0.05-0.5 Morphology: ANHEDRAL,STUBBY GRAINS FRESH* Alteration - COMBINATION ( 35%) Location: INTERSTITIAL INCLUDES CLAYS+FE.OX* Vesicles - Percent: 0 Leg : 31 Top/Bottom Interval(mm): 0/ 0 Describer: MacGregor, I. Hole: 290 Top of Core Depth(m) : 241.50 Rock Type: IGNEOUS Core: 8 Sample Midpoint(m) : 249.10 Sect/Pc #: CC/ ROCK = DIABASE Texture: MEDIUM-GRAINED,OPHITIC* Groundmass - PLAGIOCLASE ( 60%) Size(mm): .3-.8 Morphology: EUHEDRAL-SUBHEDRAL TABULAR FELTED MASS APPROX COMP AN35-55,ZONED-SODIC RIMS+ CALCIC CORES; CLINOPYROXENE ( 36%) Morphology: GRANULAR,POIKIOLITIC PLAG IN CPX GROUNDMASS,PATCHY ALTERATION TO BROWN+ GREENISH CHLORITIC MATERIAL-CONCENTRATED AT RIMS; OPAQUE MINERALS ( 2%) Morphology: EUHEDRAL SMALL,SCATTERED THROUGH SLIDE* Alteration - CHLORITE ( 4%) Location: PATCHY Replacing: PYX BROWN+GREEN CHLORITIC MATERIAL* |
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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