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Core Data from the Deep Sea Drilling Project


Leg : 17    Top/Bottom Interval(mm):     /      Describer: Bass, M.
Hole: 170   Top of Core Depth(m)   :   138.00   Rock Type: IGNEOUS
Core:  10   Sample Midpoint(m)     :   138.10   Sect/Pc #: CC/

ROCK = PLAG PHYRIC MUGEARITE
       SOURCE IS IR,SEE P.492,FAIRLY FRESH;
       Texture: CHILLED,PHYRIC*

Phenocrysts- PLAGIOCLASE               ( 12.1%)
             Size(mm):  0.72X0.14

             PLAGIOCLASE               ( 10.6%)
             Size(mm):  0.13X0.01
             SMALL EXTINCTION ANGLES INDICATE NA-RICH COMP*

Groundmass - OPAQUE MINERALS           (  2.6%)
             Morphology: EQUANT,EUHEDRAL CUBES
             ISOLATED LOCALLY CLUSTERED BUT NOT GLOMERATIC,
             MAY OCCUR AS INCLUSIONS IN PLAG PHENOS;

             ILMENITE                  ( 17.8%)
             Morphology: DENDRITIC

             GROUNDMASS                ( 56.8%)
             INCLUDES MICA+AMPHIBOLE+MONT+APATITE,MODAL
             ANALYSIS*

Alteration - MICA
             Location: GROUNDMASS

             AMPHIBOLE
             Location: GROUNDMASS

             MONTMORILLONITE
             Location: GROUNDMASS,
             Location: VESICLES

             APATITE
             Location: GROUNDMASS

Vesicles   -
             Filling: MONT          I
             Shape: RREGULAR,

             Filling:               O
             Shape: VOID
             TINY,SOME EMPTY,LARGER VESICLES TO 1+MM COMMON-
             THESE ARE LINED BY TERMINATED PLAG XTLS LINED BY
             GREEN MONT,VESICLES ON INTERIOR USAUALLY LARGER AND
             LESS COMMONLY FILLED THAN THOSE IN DARK ALTERED
             RIMS*




Leg : 17    Top/Bottom Interval(mm):  170/ 290  Describer: Bass, M.
Hole: 170   Top of Core Depth(m)   :   192.00   Rock Type: IGNEOUS
Core:  16   Sample Midpoint(m)     :   192.23   Sect/Pc #:  1/

ROCK = PYX-OL-PLAG MOD MICROPHYRIC BASALT
       SOURCE IS IR,SEE PP. 492-493;
       Texture: COARSE-GRAINED,DIABASIC INTERSERTAL,
       NONVARIOLITIC*

Phenocrysts- PYROXENE                  (  1.2%)
             Size(mm):   0.2X0.15
             MAY BE PARTLY TO ALMOST COMPLETELY REPLACED OR
             RIMMED BY CALCITE;

             OLIVINE                   (  0.6%)
             Size(mm):    0.2X0.2  Morphology: PSEUDOMORPHS
             CELAD AND/OR MONT?,MAY HAVE CALCITE FRINGES;

             PLAGIOCLASE               (  0.4%)
             Size(mm):   0.3X0.04
             FRESH EXCEPT FOR RARE PATCHES OF CALCITE*

Groundmass - PLAGIOCLASE               ( 18.0%)
             Size(mm): 0.04X0.013

             OPAQUE MINERALS           ( 16.6%)
             Size(mm):  0.04X0.02  Morphology: GRAINS,EQUANT,ELONGATE
             OPAQUE AND BROWN TRANSLUCENT GRAINS,DIMENSIONS OF
             ELONGATE GRAINS ARE 0.1X0.03,MODAL ANALYSIS*

Alteration - COMBINATION               ( 53.1%)
             INCLUDES CELAD+AMPH,BROWN AMPHIBOLE,CELAD REPLACES
             THE INTERSTITIAL RESIDUUM AND PYX(?);

             OTHER                     (  9.8%)
             Location:        <0.002
             INTERSTITIAL MASS,INCLUDES EXTREMELY FINE-GRAINED
             CELAD+FELDSPAR(PLAG)+KSPAR(POSSIBLY)+OP.MINS +
             MONT(POSSIBLY A TRACE),ALSO INCLUDES LARGE AMOUNTS
             OF A HIGH RELIEF MINERAL WHICH MAY BE SPHENE OR
             ANATASE OR EPIDOTE;

             CALCITE                   (  0.2%)
             Replacing: MICROPHENOS

Vesicles   -
             Percent:     0




Leg : 17    Top/Bottom Interval(mm):  320/ 370  Describer: Bass, M.
Hole: 170   Top of Core Depth(m)   :   192.00   Rock Type: IGNEOUS
Core:  16   Sample Midpoint(m)     :   192.35   Sect/Pc #:  1/

ROCK = PYX SPARSELY MICROPHYRIC BASALT
       SOURCE IS IR,SEE P.494,HIGHLY ALTERED;
       Texture: COARSE-GRAINED,DIABASIC INTERSERTAL,ORIGINALLY
       MAY HAVE BEEN INTERGRANULAR TO SUBOPHITIC BEFORE THE
       Texture: PYX WAS ALTERED TO MONT*

Phenocrysts- PYROXENE                  (  0.3%)

             OLIVINE                   (    0%)

Groundmass - PYROXENE                  (  5.2%)
             Size(mm):    0.1X0.1

             PLAGIOCLASE               ( 34.7%)
             Size(mm):  0.25X0.40
             INCLUDES TRACE OF KSPAR;

             OPAQUE MINERALS           ( 48.7%)
             Morphology: EQUANT,ELONGATE
             MODAL ANALYSIS*

Alteration - MONTMORILLONITE           ( 48.7%)

             APATITE                   (   TR%)

             MICA                      (   TR%)
             ONE FLAKE OF WHITE MICA,ONLY ONE IDENTIFIED
             OPTICALLY,MAY BE CELAD OR BLEACHED BIOTITE;

             CALCITE                   (  3.3%)
             Replacing: PYX
             IRREGULAR AND EUHEDRAL PATCHES,MAINLY INTERSERTAL
             BUT SOME REPLACE PYX;

             KFELDSPAR                 (   TR%)
             Location: CORES          Replacing: PLAG
             RARELY REPLACE CORES*




Leg : 17    Top/Bottom Interval(mm):  610/ 700  Describer: Bass, M.
Hole: 170   Top of Core Depth(m)   :   192.00   Rock Type: IGNEOUS
Core:  16   Sample Midpoint(m)     :   194.16   Sect/Pc #:  2/

ROCK = APHYRIC BASALT
       SOURCE IS IR,SEE P.495,ALTERED;
       Texture: COARSE-GRAINED,APHYRIC,DIABASIC INTERSERTAL,
       MAY ORIGINALLY HAVE BEEN DIABASIC INTERGRANULAR*

Groundmass - OLIVINE                   (    0%)

             PLAGIOCLASE               ( 46.3%)
             ALSO INCLUDES SECONDARY MONT+KSPAR;

             PYROXENE                  (  3.0%)

             OPAQUE MINERALS           (  5.4%)
             INCLUDES SPINEL+ILMENITE+ACCESSORY YELLOW SULFIDE
             (PROBABLY PYRITE),MODAL ANALYSIS*

Alteration - MONTMORILLONITE           ( 41.7%)

             COMBINATION               (  2.7%)
             INCLUDES BIOTITE+CHLORITE+CELAD(?);

             AMPHIBOLE                 (  0.8%)

             CALCITE                   (  0.1%)

             APATITE                   (   TR%)

             KFELDSPAR




Leg : 17    Top/Bottom Interval(mm): 1440/1470  Describer: Bass, M.
Hole: 170   Top of Core Depth(m)   :   192.00   Rock Type: IGNEOUS
Core:  16   Sample Midpoint(m)     :   194.96   Sect/Pc #:  2/

ROCK = APHYRIC BASALT
       SOURCE IS IR,SEE PP.495-496,LESS ALTERED THAN
       16-2,61-70CM;
       Texture: COARSE-GRAINED,APHYRIC,DIABASIC,VARIES LOCALLY
       FROM INTERGRANULAR TO INTERSERTAL,LOCAL
       INTERGRANULARITY MORE APPARENT THAN IN 16-2,61-70
       AND HIGHER SPECIMENS BECAUSE OF BETTER PYX
       Piece #: ERVATION*

Groundmass - PLAGIOCLASE               ( 53.2%)
             Size(mm):   1.3X0.22
             INCLUDES SECONDARY MONT;

             COMBINATION               ( 20.3%)
             INCLUDES PYX+MONT,UNEQUIVOCALLY DERIVED FROM PYX;

             OPAQUE MINERALS           (  5.3%)
             Morphology: EQUANT,ELONGATE
             EQUANT = 0.05/0.3,ELONGATE=0.3X0.02/3.35X0.03,
             MODAL ANALYSIS*

Alteration - MONTMORILLONITE           ( 19.3%)
             MAY INCLUDE PSEUDOMORPHS AFTER OL,WITHIN MONT ARE
             DISCRETE BOOKS OR LARGE FLAKES WHICH ARE DIRTY
             WITH INCLUSIONS,MAY BE RELICS OF SINGLE XTL
             IDDINGS WHICH HAD REPLACED PRIMARY OL OR MUCH LESS
             LIKELY ALTERED BIOTITE,RARE INTERSERTAL PATCHES
             HAVE SUBHEDRAL OUTLINES AND MAY ENCLOSE BIOTITE
             FLAKES OR TINY CALCITE PATCHES-THESE ARE THE ONLY
             DIRECT SUGGESTIONS OF PSEUDOMORPHS AFTER OL-BUT
             THEY MAY EQUALLY WELL BE ALTERED BIOTITE;

             COMBINATION               (  0.8%)
             INCLUDES BROWN BIOTITE+CHLORITE+CELAD(?),BIOTITE
             IN SOME CASES CONCENTRATED AROUND EQUANT OPAQUE
             GRAINS WHICH PROBABLY ARE TITANOMAGNETITE;

             AMPHIBOLE                 (  0.5%)

             CALCITE                   (   TR%)

             APATITE                   (  0.6%)

Vesicles   -
             Percent:     0




    

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.

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