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 : 17    Top/Bottom Interval(mm): 1370/1400  Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1166.00   Rock Type: IGNEOUS
Core:  94   Sample Midpoint(m)     :  1168.89   Sect/Pc #:  2/

ROCK = DIABASE OR COARSE-GRAINED BASALT
       SOURCE IS IR,SEE P.483,HIGHLY ALTERED;
       Texture: INTERGRANULAR TO INTERSERTAL,DIABASIC,
       Texture: URALLY COMPLEX*

Phenocrysts- PLAGIOCLASE               (    5%)
             XENOCRYSTS,MAX >(13X7.5X7MM),CORES DIAGENETICALLY
             REPLACED BY MINOR KSPAR AND TRACES OF MONT AND
             PHILLIPSITE*

Groundmass - PLAGIOCLASE               ( 30.4%)
             Size(mm):   0.3X0.06

             PYROXENE                  (  9.4%)
             TINY IRREGULAR REMNANTS WHICH ESCAPED EXTENSIVE
             CONVERSION TO MONT COMPRISE MUCH OF "INTERSERTAL
             MONTMORILLONITE",ORIGINALLY TEXTURALLY
             INTERGRANULAR WITH PLAG;

             OPAQUE MINERALS           (  4.0%)
             Size(mm):    0.1X0.1  Morphology: EQUANT,SKELETAL
             MODAL ANALYSIS*

Alteration - MONTMORILLONITE           (  42.%)
             Location: 9

             COMBINATION               (   1.%)
             Location: 5
             INCLUDES CALCITE+MONT PATCHES;

             CALCITE                   (   5.%)
             Location: 7
             FREE OF MONT;

             PHILLIPSITE
             Replacing: PLAG

             KFELDSPAR
             Replacing: PLAG

Vesicles   -
             Size(mm):  1.1X1.1
             Percent:   1.2




Leg : 17    Top/Bottom Interval(mm):  780/ 840  Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1166.00   Rock Type: IGNEOUS
Core:  94   Sample Midpoint(m)     :  1169.81   Sect/Pc #:  3/

ROCK = APHYRIC DIABASE OR COARSE-GRAINED BASALT
       SOURCE IS IR,SEE PP.483-484;
       Texture: APHYRIC*

Groundmass - PLAGIOCLASE               ( 43.5%)
             Size(mm):  0.45X0.12
             APPROX COMP AN53 TO AN67 BY CARLSBAD-ALBITE TWINS;

             PYROXENE                  ( 14.0%)
             Size(mm):  0.15X0.15
             REMNANTS;

             OPAQUE MINERAL            (  3.2%)
             Size(mm):   0.3X0.25

             OLIVINE                   (    0%)
             MODAL ANALYSIS*

Alteration - MONTMORILLONITE           ( 39.3%)
             Replacing: PYX,PLAG,MESOSTASIS
             INTERSERTAL;

             CALCITE                   (   TR%)




Leg : 17    Top/Bottom Interval(mm):     /      Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1166.00   Rock Type: IGNEOUS
Core:  94   Sample Midpoint(m)     :  1170.60   Sect/Pc #: CC/

ROCK = COARSE-GRAINED BASALT
       SOURCE IS IR ,SEE P.484;
       Texture: INTERSERTAL,RELATIVELY COARSE-GRAINED*

Groundmass - PLAGIOCLASE               (15-20%)

             PYROXENE                  (    3%)
             REMNANTS;

             GROUNDMASS                (   80%)

             OPAQUE MINERALS

             PYRITE                    (   TR%)
             MARKS FORMER MESOSTASIS*

Alteration - CALCITE
             Location: PATCHES

             MONTMORILLONITE
             Replacing: PYX
             FORMS BULK OF GROUNDMASS*

Vesicles   -
             Percent:  RARE
             Filling: MONT




Leg : 17    Top/Bottom Interval(mm):     /   1  Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1166.00   Rock Type: IGNEOUS
Core:  94   Sample Midpoint(m)     :  1170.50   Sect/Pc #: CC/

ROCK = BASALTIC BRECCIA
       SOURCE IS IR, SEE P.484,CLASTS ARE COARSE- AND FINE
       GRAINED BASALT WITH CALCITE CEMENT;
       Texture: FINER-GRAINED BASALT CLASTS ARE CRUDELY
       VARIOLITIC*

Groundmass - PLAGIOCLASE
             IN FINER-GRAINED BASALT OCCURS IN VAGUE RADIAL TO
             SUBRADIAL ARRAYS;

             OPAQUE MINERALS

Alteration - MONTMORILLONITE
             Replacing: GLASS
             PATCHES ENCLOSE CALCITE? GRANULES;

             CALCITE
             Location: PATCHES
             RIMMED BY GREEN MONT*

             PYRITE
             ONE OVOID CLAST OF GREEN MONT IS MORE THAN 50%
             PYRITE*




Leg : 17    Top/Bottom Interval(mm):  550/      Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1175.00   Rock Type: IGNEOUS
Core:  95   Sample Midpoint(m)     :  1175.55   Sect/Pc #:  1/

ROCK = PLAG-PYX SPARSELY PHYRIC BASALT
       SOURCE IS IR,SEE P. 484;
       Texture: PORPHYRITIC, INTERSERTAL*

Phenocrysts- PLAGIOCLASE

             PYROXENE

             OLIVINE                   (    0%)

Groundmass - PLAGIOCLASE               (   15%)

             PYROXENE                  (  2-3%)
             Morphology: GRANULAR

             OPAQUE MINERALS           (    8%)

             GROUNDMASS                (56-70%)
             INTERSERTAL MONT AND FEATHERY PYX;

             PYROXENE
             Morphology: FEATHERY

Alteration - KFELDSPAR
             Replacing: PLAG
             ALL BUT FINE RIMS OF PLAG REPLACED;

             MONTMORILLONITE
             Replacing: PLAG
             ALL BUT FINE RIMS OF PLAG REPLACED;

             MONTMORILLONITE
             Location: GROUNDMASS

             CHLOROPHAEITE

             CALCITE
             Location: AMOEBOID
             Location: PATCHES

Vesicles   -
             Filling:  MONT




Leg : 17    Top/Bottom Interval(mm):  890/ 910  Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1175.00   Rock Type: IGNEOUS
Core:  95   Sample Midpoint(m)     :  1175.90   Sect/Pc #:  1/

ROCK = BASALT
       SOURCE IS IR,SEE P. 484;
       Texture: GLASSY SELVAGE,ALTERED GLASS HAS CONCENTRIC
       COLOR LAMINATIONS OUTLINING TINY BLOCKS LIKE THOSE
       IN PALAG*

Phenocrysts- PLAGIOCLASE
             ONLY 1 OBSERVED,COLORLESS,ORANGE-RED CORE*




Leg : 17    Top/Bottom Interval(mm):  400/ 430  Describer: Bass, M.
Hole: 167   Top of Core Depth(m)   :  1175.00   Rock Type: IGNEOUS
Core:  95   Sample Midpoint(m)     :  1176.92   Sect/Pc #:  2/

ROCK = PLAG-PYX-OL PHYRIC BASALT
       SOURCE IS IR,SEE P.484;
       Texture: FINE-GRAINED,PHYRIC,VARIOLITIC*

Phenocrysts- PLAGIOCLASE               (  2.1%)
             XENOCRYSTS (?),USUALLY ALL BUT A THIN RIM IS
             REPLACED BY KSPAR AND MONT,IN SOME CASES THE CORE
             SURVIVES AND AN INTERMEDIATE ONE IS REPLACED BY
             MONT OR THE CORE IS DISSOLVED OUT LEAVING A HOLE
             SURROUNDED BY A PLAG RIM;

             PLAGIOCLASE               (  1.5%)
             Size(mm):  0.22X0.40
             MICROPHENOS;

             PYROXENE                  (  1.6%)
             Size(mm):  0.17X0.13

             OLIVINE                   (  0.1%)
             Size(mm):   0.12X0.1  Morphology: PSEUDOMORPHS
             ALTERED TO MONT*

Groundmass - PLAGIOCLASE               (  6.8%)
             Size(mm): .046X0.004
             COMPONENTS OF FEATHERY VARIOLES;

             PYROXENE                  ( 44.4%)
             Morphology: VARIOLITIC
             PLUS MONT;

             OPAQUE MINERALS           ( 13.0%)
             Size(mm):       0.04  Morphology: EQUANT,ELONGATE
             EQUANT=0.04MM MAX,ELONGATE=0.04X0.005 MAX*

Alteration - KFELDSPAR
             Replacing: PLAG

             MONTMORILLONITE
             Replacing: PLAG,OL

             MONTMORILLONITE           ( 14.8%)
             Replacing: GROUNDMASS

             CHLOROPHAEITE
             ID UNCERTAIN,MAY BE AMYGDULES*

Vesicles   -
             Filling: MONT,CHOROPH
             NO CONCLUSIVE EVIDENCE THESE ARE AMYGDULES-MAY BE
             PATCHES*




    

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