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*
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