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Core Data from the Deep Sea Drilling Project


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*




    

Introduction


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]

These Web pages are from the Core Data from the Deep Sea Drilling Project Legs 1-96 CD-ROM produced in 1989 and modified in 2000 by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center (now part of the National Centers for Environmental Information), and collocated World Data Center for Marine Geology and Geophysics, Boulder (now part of the World Data Service for Geophysics). Data were compiled in cooperation with the U.S. Science Support Program, of the Joint Oceanographic Institutions, Inc. (now the Consortium for Ocean Leadership), and the U.S. National Science Foundation.

Please see NOAA's privacy and disclaimer information. Send questions or comments to mgg.info@noaa.gov.

Department of Commerce > NOAA > NESDIS > NCEI > doi:10.7289/V54M92G2