NOAA logo, National Centers for Environmental Information, National Oceanic and Atmospheric Administration NSF logo, National Science Foundation, Division of Ocean Sciences

Core Data from the Deep Sea Drilling Project


Leg : 67    Top/Bottom Interval(mm):    0/ 550  Analyst: Cowan, D.S.
Hole: 500   Sample Midpoint (m)    :   157.05
Core:  18   Top of Core Depth (m)  :   156.50
Sect:  1    Top of Section Depth(m):   156.50

LITHOLOGY: OL-PLAG MICROPHYRIC TO APHYRIC BASALT;

  Piece No.  : PCES 1 (0-2), 2 (7-14), 3 (16-18), 4 (24-28),
               5 (31-36), 6 (39-44), 7 (46-54);

  Texture    : VERY FINE GRAINED, MICROPHYRIC TO APHYRIC, PCES 6 &
               7 ARE VERY FINE GRAINED BUT APHYRIC, PCE 5 HAS A 2CM
               GLASSY RIM(5MM THICK), PCES 1 & 2 & 7 HAVE SMALL
               (1CM OR LESS) ATTACHED SELVAGES OF SOFT BLUISH WHITE
               NANNOFOSSIL CHALK;

  Alteration : FRESH
               SOME OL PHENOS PROBABLY ALTERED TO CLAY MINERALS
               (GREENISH), PCES(1, 2, 4) HAVE CONCENTRIC
               WEATHERING RINDS;

  Comments   : DARK GREY TO BLACK, PCES(1, 2, 4) HAVE TAN OUTER
               LAYERS;

  Phenocrysts: PLAGIOCLASE               ( TO 1%)
               Size(mm):        2-3

               OLIVINE                   ( TO 1%)
               Size(mm):       TO 1

  Groundmass : PLAGIOCLASE
               MICROLITES;

  Replacement: CLAY
               PHENOS IN PCES 1-5 IN SOME CASES ALTERED TO
               GREENISH CLAY;


Leg : 67    Top/Bottom Interval(mm):    0/ 160  Analyst: Cowan, D.S.
Hole: 500   Sample Midpoint (m)    :   158.66
Core:  19   Top of Core Depth (m)  :   158.50
Sect:  1    Top of Section Depth(m):   158.50

LITHOLOGY: PLAG-OL MOD PHYRIC BASALT;

  Piece No.  : PCES 1 (2-9), 2 (11-16);

  Texture    : PHYRIC;

  Structure  : CAVITIES ON OUTER SURFACE OF PCE LOCALLY COATED WITH
               DRUSES OF SOFT GREEN TO YELLOW-GREEN CLAY;

  Alteration : EXT
               OL ALTERED TO ORANGE BROWN CLAY TO IRON OXIDES;

  Comments   : TAN TO BROWN;

  Phenocrysts: PLAGIOCLASE               (    7%)
               Size(mm):       TO 4

               OLIVINE                   (    2%)
               Size(mm):          2
               OL PHENOS ALTERED TO ORANGE BROWN CLAY TO IRON
               OXIDES, ID UNCERTAIN FOR OL;

  Replacement: CLAY
               SOFT GREEN TO YELLOW GREEN;


Leg : 67    Top/Bottom Interval(mm):  180/ 660  Analyst: Cowan, D.S.
Hole: 500   Sample Midpoint (m)    :   159.16
Core:  19   Top of Core Depth (m)  :   158.50
Sect:  1    Top of Section Depth(m):   158.68

LITHOLOGY: PLAG-OL MOD PHYRIC BASALT;

  Piece No.  : PCES 3 (18-27), 4 (30-45), 5 (47-55), 6 (61-66);

  Texture    : PHYRIC;

  Alteration : FRESH
               TAN WEATHERING RIND ON PCES(4, 5, 6), MICROPHENOS
               OF OL(?) ALTERED TO ORANGE BROWN CLAY OR GREEN
               SOFT CLAY, TAN WEATHERED ZONE 1CM THICK ADJACENT
               TO CHALK;

  Comments   : DARK GREY TO BLACK, ATTACHED TO PCE 4 IS SELVAGE OF
               HARD(BAKED?) CREAMY WHITE CHALK, RELICT FORAM TESTS
               VISIBLE WITH HAND LENS, CHALK ALSO CONTAINS
               SUBROUNDED TO ANGULAR FRAGMENTS OF TAN BASALT AND
               DARK GREEN SOFT CLAY CONTAINING PLAG MICROLITES
               (PROBABLY WAS GLASSY);

  Vesicles   : Size(mm):        5   Percent:
               Location:            Filling: CLAY
               PCE 4 CONTAINS VESICLES FILLED WITH GREEN CLAY;

  Phenocrysts: PLAGIOCLASE               (    3%)
               Size(mm):          2

               OLIVINE                   (    2%)
               ID UNCERTAIN FOR MICROPHENOS SINCE ALTERED TO
               ORANGE BROWN CLAY OR SOFT GREEN CLAY;

  Groundmass : FELDSPAR
               MATRIX WITH FELDSPAR MATRIX;

  Replacement: CLAY


Leg : 67    Top/Bottom Interval(mm):  690/ 750  Analyst: Cowan, D.S.
Hole: 500   Sample Midpoint (m)    :   159.25
Core:  19   Top of Core Depth (m)  :   158.50
Sect:  1    Top of Section Depth(m):   159.19

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCE 7 (69-75);

  Texture    : APHYRIC;

  Structure  : CAVITIES PARTLY LINED WITH DRUSES OF CALCITE AND
               PALE GREEN CLAY;

  Alteration : MOD
               LIGHT GREY WEATHERING RIND;

  Comments   : DARK GREY;

  Vesicles   : VESICLES PARTLY LINED WITH DRUSES OF CALCITE AND
               PALE GREEN CLAY;

  Replacement: CLAY

               CALCITE


    

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