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Core Data from the Deep Sea Drilling Project


Leg : 81    Top/Bottom Interval(mm):  270/ 290  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   123.50   Rock Type: IGNEOUS
Core:   6   Sample Midpoint(m)     :   126.78   Sect/Pc #:  3/

ROCK = APHYRIC BASALT
       MODERATELY ALTERED;
       Texture: APHYRIC, FINE-GRAINED, VESICULAR;
       Where sampled: FLOW INTERIOR*

Groundmass - OLIVINE                   (    2%)
             Size(mm):     .1-.05  Morphology: EUHEDRAL
             ALTERED IDDINGS;

             PLAGIOCLASE               (   25%)
             Size(mm):    .15-.03  Morphology: LATHS
             FRESH, APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   13%)
             Size(mm):    .02-.05  Morphology: ANHEDRAL-SUBHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):    .01-.02  Morphology: ANHEDRAL-SUBHEDRAL

             GLASS                     (   10%)
             FRESH*

Alteration - CLAY MINERALS             (   20%)
             Location: GROUNDMASS     Replacing: GLASS
             INCLUDES DARK BROWN SMEC*

Vesicles   -
             Percent:    20
             Location: THROUGHOUT
             Filling: EMPTY
             Shape: CIRCULAR




Leg : 81    Top/Bottom Interval(mm):   60/  80  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   123.50   Rock Type: IGNEOUS
Core:   6   Sample Midpoint(m)     :   126.98   Sect/Pc #: CC/

ROCK = APHYRIC BASALT;
       MODERATELY TO EXTENSIVELY ALTERED;
       Texture: APHYRIC, FINE-GRAINED, VESICULAR;
       Where sampled: NEXT TO GLASSY MARGIN*

Groundmass - OLIVINE                   (    1%)
             Size(mm):        .05  Morphology: EUHEDRAL
             INCLUDES IDDINGS;

             PLAGIOCLASE               (   25%)
             Size(mm):     .1-.05  Morphology: LATHS
             FRESH,APPROX COMP LABRADORITE;

             CLINOPYROXENE             (    4%)
             Size(mm):         .1  Morphology: SUBHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):        .02  Morphology: EUHEDRAL-SUBHEDRAL

Alteration - CLAY MINERALS             (   20%)
             Location: GROUNDMASS     Replacing: GLASS
             INCLUDES DARK BROWN SMEC*

Vesicles   -
             Size(mm):      1-2
             Percent:    40
             Location: NEAR MARGIN
             Filling: CALCITE
             Shape: SPHERICAL
             MICRITE OR SPARITE FILLING*




Leg : 81    Top/Bottom Interval(mm):  820/   0  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   133.00   Rock Type: IGNEOUS
Core:   7   Sample Midpoint(m)     :   133.82   Sect/Pc #:  1/PCE 7

ROCK = APHYRIC BASALT
       MODERATELY ALTERED;
       Texture: APHYRIC, FINE-GRAINED, VESICULAR;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   15%)
             Size(mm):    .05-.15  Morphology: LATHS
             APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   30%)
             Size(mm):         .1  Morphology: SUBHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):        .05  Morphology: EUHEDRAL-SUBHEDRAL
             FRESH;

             GLASS                     (    5%)
             FRESH*

Alteration - CLAY MINERALS             (   10%)
             Location: GROUNDMASS     Replacing: GLASS
             INCLUDES DARK BROWN SMEC*

Vesicles   -
             Size(mm):      1-3
             Percent:    30
             Location: THROUGHOUT
             Filling: CALCITE
             Shape: IRREGULAR




Leg : 81    Top/Bottom Interval(mm): 1000/1020  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   133.00   Rock Type: IGNEOUS
Core:   7   Sample Midpoint(m)     :   135.51   Sect/Pc #:  2/PCE 8A

ROCK = PLAG-CPX MODERATELY PHYRIC BASALT
       FRESH;
       Texture: FINE-GRAINED, MODERATELY PHYRIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (    2%)
             Size(mm):         .4  Morphology: ANHEDRAL LATHS
             APPROX COMP AB + K-SPAR;

             CLINOPYROXENE             (    2%)
             Size(mm):         .3  Morphology: SUBHEDRAL
             APPROX COMP AUGITE*

Groundmass - PLAGIOCLASE               (   30%)
             Size(mm):         .2  Morphology: LATHS
             FRESH, APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   40%)
             Size(mm):         .1  Morphology: ANHEDRAL-SUBHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):        .05  Morphology: SUBHEDRAL

             GLASS                     (   15%)
             FRESH*

Vesicles   -
             Size(mm):       .4
             Percent:     1
             Location: THROUGHOUT
             Shape: CIRCULAR
             SMEC,BROWNISH-YELLOW*




Leg : 81    Top/Bottom Interval(mm): 1120/1130  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   133.00   Rock Type: IGNEOUS
Core:   7   Sample Midpoint(m)     :   137.13   Sect/Pc #:  3/PCE 14

ROCK = APHYRIC BASALT
       MODERATELY ALTERED;
       Texture: APHYRIC, FINE-GRAINED;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   35%)
             Size(mm):         .2  Morphology: SUBHEDRAL
             FRESH, APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   25%)
             Size(mm):         .1  Morphology: SUBHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):    .02-.05

             GLASS                     (   20%)
             FRESH*

Alteration - CLAY MINERALS             (   10%)
             Location: GROUNDMASS     Replacing: GLASS
             INCLUDES YELLOW-RED SMEC*




Leg : 81    Top/Bottom Interval(mm):   70/  90  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   152.00   Rock Type: IGNEOUS
Core:   9   Sample Midpoint(m)     :   152.08   Sect/Pc #:  1/PCE 1

ROCK = KSPAR SPARSELY PHYRIC BASALT;
       MODERATELY TO EXTENSIVELY ALTERED;
       Texture: FINE GRAINED,SPARSELY PHYRIC;
       Where sampled: PEBBLE OF VOLCANIC CONGLOMERATE*

Phenocrysts- KFELDSPAR                 (    1%)
             Size(mm):         .5  Morphology: LATHS

Groundmass - OLIVINE                   (   15%)
             Size(mm):         .1  Morphology: EUHEDRAL,CORRODED
             ALTERED IDDINGS;

             PLAGIOCLASE               (   25%)
             Size(mm):     .05-.1
             FRESH, APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   20%)
             Size(mm):        .05  Morphology: SUBHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   15%)
             Size(mm):        .02  Morphology: ANHEDRAL-SUBHEDRAL

             ALTERED GLASS

Alteration - CLAY MINERALS             (   25%)
             Location: GROUNDMASS     Replacing: GLASS
             INCLUDES DARK BROWN SMEC*




Leg : 81    Top/Bottom Interval(mm):  570/ 590  Describer: Morton, A.C.
Hole: 554A  Top of Core Depth(m)   :   161.50   Rock Type: IGNEOUS
Core:  10   Sample Midpoint(m)     :   162.08   Sect/Pc #:  1/PCE 6

ROCK = PLAG-AB-KSPAR MODERATELY PHYRIC BASALT;
       Texture: FINE-GRAINED,MODERATELY PHYRIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (    3%)
             Size(mm):       .5-1  Morphology: EUHEDRAL
             APPROX COMP LABRADORITE;

             COMBINATION               (    2%)
             Size(mm):       .5-1  Morphology: EUHEDRAL
             INCLUDES AB + KSPAR*

Groundmass - OLIVINE                   (    3%)
             Size(mm):     .05-.1  Morphology: SUBHEDRAL-EUHEDRAL
             INCLUDES IDDINGS;

             PLAGIOCLASE               (   25%)
             Size(mm):         .2  Morphology: LATHS
             APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   30%)
             Size(mm):        .05  Morphology: SUBHEDRAL-ANHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):    .02-.05  Morphology: EUHEDRAL-SUBHEDRAL

             GLASS                     (   25%)

Vesicles   -
             Size(mm):       .4
             Percent:     2
             Location: THROUGHOUT
             Filling: CLAY OR CALCITE
             Shape: ROUND

             Shape: IRREGULAR




Leg : 81    Top/Bottom Interval(mm):  480/ 500  Describer: Desprairies, A.
Hole: 554A  Top of Core Depth(m)   :   199.50   Rock Type: IGNEOUS
Core:  14   Sample Midpoint(m)     :   199.99   Sect/Pc #:  1/PCE 5

ROCK = PLAG-CPX-KSPAR MODERATELY PHYRIC BASALT
       FRESH TO MODERATELY ALTERED;
       Texture: FINE-GRAINED,MODERATELY PHYRIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (    3%)
             Size(mm):          2  Morphology: LATHS
             APPROX COMP LABRADORITE;

             CLINOPYROXENE             (    1%)
             Size(mm):          1  Morphology: SUBHEDRAL-EUHEDRAL
             APPROX COMP AUGITE;

             KFELDSPAR                 (    1%)
             Size(mm):      1-1.5  Morphology: LATHS

Groundmass - PLAGIOCLASE               (   25%)
             Size(mm):      .1-.2  Morphology: LATHS
             APPROX COMP LABRADORITE,FRESH;

             CLINOPYROXENE             (   25%)
             Size(mm):         .5  Morphology: SUBHEDRAL-ANHEDRAL
             FRESH, APPROX COMP AUGITE;

             MAGNETITE                 (   10%)
             Size(mm):    .01-.02  Morphology: EUHEDRAL-SUBHEDRAL

             GLASS                     (   20%)
             FRESH*

Alteration - CLAY MINERALS             (   15%)
             Location: GROUNDMASS     Replacing: GLASS
             DARK BROWN*

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.

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