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Core Data from the Deep Sea Drilling Project


Leg : 67    Top/Bottom Interval(mm): 1150/1500  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   429.00
Core:  46   Top of Core Depth (m)  :   427.50
Sect:  1    Top of Section Depth(m):   428.65

LITHOLOGY: OL-PLAG MICROPHYRIC BASALT;

  Piece No.  : PCES 1 (117-123), 2 (125-130), 3 (133-135),
               4 (137-144), 5 (146-150);

  Texture    : MICROPHYRIC, GROUNDMASS IS CRYSTALLINE AND
               MICROLITIC;

  Structure  : PCE 1 CONTAINS CAVITIES COMPLETELY FILLED WITH
               CRYSTALLINE WHITE CALCITE;

  Alteration : SLIGHTLY;

  Comments   : DARK GREY, THE ACTUAL CONTACT OF BASALT AND
               FORAMINIFERAL NANNOFOSSIL CHALK IS NOT PRESERVED,
               BUT LOWEST CHALK CONTAINS ABUNDANT WELL-PRESERVED
               FORAMS;

  Phenocrysts: OLIVINE                   (   <7%)
               Size(mm):         <1
               OL ALTERED TO ORANGE-BROWN MATERIAL, LOCALLY

               CLUSTERED                 (D;   %)

               PLAGIOCLASE               (   <4%)
               Size(mm):          2
               PLAG PHENOS AVERAGE 2MM. LONG;

  Replacement: CALCITE


Leg : 67    Top/Bottom Interval(mm):    0/1050  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   429.55
Core:  47   Top of Core Depth (m)  :   428.50
Sect:  1    Top of Section Depth(m):   428.50

LITHOLOGY: OL-PLAG MODERATELY PHYRIC BASALT;

  Piece No.  : PCES 1A (0-15), 1B (25-20), 2A (22-27), 2B (27-31),
               3 (33-39), 4A (44-50), 4B (50-58), 4C (57-63),
               5 (72-75), 6A (82-85), 6B (85-95), 6C (95-105);

  Texture    : GENERALLY PHYRIC, GROUNDMASS IS MICROLITIC AND
               CRYSTALLINE TO APHANITIC, PCE 3A TOP HAS 1 CM
               ALTERED GLASS RIM, PCE IN 5 IS ALSO PARTLY GLASS;

  Structure  : PCE 4A HAS WHITE CRYSTALLINE VEIN(<1MM) SURROUNDED
               BY TAN ALTERED GROUNDMASS SAME FOR SOME PCES IN 5;

  Alteration : FRESH
               PCES 1A-3, PCE 3 HAS ALTERED GLASSY RIM ON TOP;
               MOD
               PCES 4A-6C MOD ALTERED, PCE 4A SURROUNDED BY TAN
               ALTERED GROUNDMASS AS WELL AS SOME PCES IN 5, OL
               PARTLY ALTERED TO ORANGE-BROWN CLAY(?), PCES 2A &
               2B OX STAINS;

  Comments   : DARK GREY TO TAN BASALT, PCES 2A & 2B ARE CREAMY
               WHITE AND FIRM(BAKED CHALK?) WITH BLACK DENDRITIC
               OX STAINS & ANGULAR 2-5MM FRAGMENTS OF GREENISH
               YELLOW WAXY MATERIAL;

  Phenocrysts: OLIVINE                   (    5%)
               Size(mm):         <2
               PARTLY ALTERED TO ORANGE-BROWN CLAY(?);

               PLAGIOCLASE               (    3%)
               Size(mm):       TO 4
               PRESENT AS LATHS;

  Replacement: CLAY
               Minerals Replaced:   OL
               ORANGE-BROWN, ID CLAY UNCERTAIN;

               CLAY
               Minerals Replaced:   GLASS
               ORANGE-BROWN;


Leg : 67    Top/Bottom Interval(mm):    0/1500  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   438.00
Core:  48   Top of Core Depth (m)  :   436.50
Sect:  1    Top of Section Depth(m):   436.50

LITHOLOGY: OL-PLAG MODERATELY PHYRIC BASALT;

  Piece No.  : PCES 1 (0-5), 2 (10-21), 3 (25-30), 4 (32-35),
               5A (38-46), 5B (49-51), 5C (51-60), 6 (65-67),
               7 (70-75), 8 (79-87), 9 (90-97), 10 (100-106),
               11 (107-123), 12 (124-130), 13 (133-138),
               14 (141-150);

  Texture    : PHYRIC, PCES 4 & 6 & 10 HAVE GLASSY BROWN-BLACK RIM
               (TO 1CM);

  Structure  : PCES 12 & 8 ALTERATION RELATED TO 1-2MM WHITE
               CRYSTALLINE VEINS, ALTERNATING GLASSY AND FRESH
               PCES SUGGEST PILLOW LAVA;

  Alteration : MOD-FRESH
                25-50CM & 60-89CM & 100-150CM,
               LOCALLY SMALLER PCES(6) ARE ALTERED THROUGHOUT AND
               REDDISH-BROWN IN COLOR, PCES 4 & 6 & 10 HAVE
               GLASSY BROWN-BLACK RIMS LOCALLY ALTERED TO ORANGE
               BROWN CLAY, PCES 12 & 8 ALTERATION AS IN 6 RELATED
               TO CRYSTALLINE VEINS;

  Comments   : DARK GREY;

  Vesicles   : Size(mm):      1-3   Percent:
               Location:            Filling: CLAY
               PCE 11 GREEN WAXY CLAY;

  Phenocrysts: OLIVINE                   (    5%)
               Size(mm):         <2
               LOCALLY REPLACED BY ORANGE-BROWN ALTERATION
               MATERIALS;

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

  Replacement: CLAY


Leg : 67    Top/Bottom Interval(mm):    0/1400  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   439.40
Core:  48   Top of Core Depth (m)  :   436.50
Sect:  2    Top of Section Depth(m):   438.00

LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1 (0-2), 2 (7-14), 3 (16-25), 4 (27-35),
               5 (37-39), 6 (41-49), 7 (50-58), 8 (60-66),
               9A (68-78), 9B(79-87), 10 (90-96), 11 (98-110),
               12 (111-126), 13A (129-136), 13B (136-140);

  Texture    : PHYRIC, MICROLITIC, PCES 5 & 6 & 8 HAVE GLASSY RIMS;

  Structure  : PCE 6 HAS 2CM PATCH OF DRUSY CALCITE COATING
               INDENTATION IN GLASSY RIM, PCE 7 CONTAINS 1-2MM
               WHITE VEINS WITH ADJACENT RED BROWN ALTERED ZONES;

  Alteration : MOD
               PCES 1-8 ALTERED TO PALE BROWN TO RED BROWN, OL
               ALTERS TO ORANGE BROWN CLAY APPROACHING GLASS RIM
               PCES 5 & 6 & 8, PCE 7 CONTAINS VEINS WITH ADJACENT
               RED BROWN ALTERED ZONES;
               FRESH
               PCES 9-13;

  Phenocrysts: OLIVINE                   (   <5%)
               Size(mm):       TO 2

               PLAGIOCLASE               (   <2%)
               Size(mm):       TO 4

  Replacement: CALCITE
               DRUSY CALCITE COATING INDENTATION IN GLASSY RIM OF
               PCE 6;


Leg : 67    Top/Bottom Interval(mm):    0/1100  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   440.60
Core:  48   Top of Core Depth (m)  :   436.50
Sect:  3    Top of Section Depth(m):   439.50

LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (0-15), 1B (15-26), 2A (31-40), 2B (41-46),
               2C (46-65), 3 (67-74), 4A (81-100), 4B (101-109),

  Texture    : PHYRIC, PCES 2-4 HAVE GLASSY RIMS, MICROLITIC
               GROUNDMASS;

  Structure  : PCE 2C HAS VEIN, PCE 1A HAS PATCHES FILLED WITH
               DRUSY CALCITE, PCES 1A & 2-4 PROBABLY ALL PILLOW
               BASALTS;

  Alteration : MOD TO FRESH
               46-86CM MOD, OL PHENOS LOCALLY ALTERED TO RED
               BROWN CLAY, BASALT LOCALLY ALTERED TO REDDISH
               BROWN, ALTERED IN VICINITY OF VEIN IN 2C;

  Comments   : DARK GREY WHERE FRESH;

  Vesicles   : Size(mm):        3   Percent:
               Location:            Filling: CALCITE
               PCE 1A DRUSY CALCITE;

  Phenocrysts: OLIVINE                   (   <5%)
               Size(mm):         <2

               PLAGIOCLASE               (    2%)
               Size(mm):          2
               MICROPHENOS;

  Replacement: CALCITE


Leg : 67    Top/Bottom Interval(mm):    0/1300  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   442.30
Core:  48   Top of Core Depth (m)  :   436.50
Sect:  4    Top of Section Depth(m):   441.00

LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (0-16), 1B (16-24), 1C (15-30), 1D (31-40)
               1E (41-48), 1F (50-53), 1G (55-60), 1H (61-76),
               1I (75-85), 2 (89-94), 3 (96-104), 4 (106-110),
               5A (115-121), 5B (120-122), 6 (124-130);

  Texture    : MOD PHYRIC, PCES 1A-1G HAVE GLASSY SELVAGES-PROBABLY
               CHILLED RIMS OF PILLOWS;

  Structure  : GLASSY SELVAGES IN PCES 1A-1G ARE PROBABLY CHILLED
               RIMS OF PILLOWS, SOME FRACTURES IN 1B & C COATED
               WITH GREENISH CLAY, 1B HAS 2CM CAVITY LINED WITH
               CALCITE CRYSTALS, 1C HAS A 1X2CM LARGE CAVITY FILLED
               WITH CREAMY CALCITE;

  Alteration : MOD
               PCES 1A-1G ARE ALTERED AND PARTLY REDDISH BROWN,
               OL ALTERED TO REDDISH BROWN AND GREEN CLAY;
               FRESH
               PCES 1H-5 EXTREMELY FRESH;
               MOD
               PCE 6;

  Comments   : DARK GREY TO RED BROWN ALTERED BASALT;

  Phenocrysts: OLIVINE                   (    2%)
               Size(mm):         <1

               PLAGIOCLASE               (    2%)
               Size(mm):       TO 4

  Groundmass : MICROLITIC;

  Replacement: CALCITE
               LINES CAVITY IN 1B IN FORM OF CALCITE CRYSTALS,
               FILLS CAVITY IN 1C WITH CREAMY CALCITE;


Leg : 67    Top/Bottom Interval(mm):    0/ 200  Analyst: Cowan, D.S.
Hole: 495   Sample Midpoint (m)    :   446.20
Core:  49   Top of Core Depth (m)  :   446.00
Sect:  1    Top of Section Depth(m):   446.00

LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1 (0-4), 2 (10-19);

  Texture    : MOD PHYRIC, MEDIUM TO FINE GRAINED, GROUNDMASS
               LOCALLY VARIOLITIC;

  Structure  : FRACTURES LOCALLY COATED WITH OLIVINE GREEN CLAY;

  Alteration : FRESH;

  Phenocrysts: OLIVINE                   (    5%)
               Size(mm):       TO 2

               PLAGIOCLASE               (    1%)
               Size(mm):       TO 2
               PLAG PRESENT AS LATHS;


    

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