Core Data from the Deep Sea Drilling Project

Leg : 74    Top/Bottom Interval(mm):  860/ 890  Describer: Richardson, S.H.
Hole: 528   Top of Core Depth(m)   :   483.00   Rock Type: IGNEOUS
Core:  40   Sample Midpoint(m)     :   486.88   Sect/Pc #:  3/PCE 1D

ROCK = PLAG-CPX PHYRIC BASALT;
       Texture: SUBOPHITIC,PHYRIC,COARSE-GRAINED;
       Where sampled: FLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (   15%)
             Size(mm):        8X4  Morphology: STUBBY LATHS,TWINNED,ZONED
             APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   <1%)
             Size(mm):        1X1  Morphology: SUBHEDRAL
             APPROX COMP AUGITE*

Groundmass - PLAGIOCLASE               (   42%)
             Size(mm):      .6X.2  Morphology: EUHEDRAL LATHS,TWINNED

             CLINOPYROXENE             (   39%)
             Size(mm):      .2X.2  Morphology: SUBHEDRAL,SOME ZONING

             MAGNETITE                 (    3%)
             Size(mm):      .1X.1  Morphology: SKELETAL

Alteration - CLAY MINERALS             (    3%)
             Location: GROUNDMASS     Replacing: PYX

Vesicles   -
             Percent:     0




Leg : 74    Top/Bottom Interval(mm):  500/ 530  Describer: Richardson, S.H.
Hole: 528   Top of Core Depth(m)   :   501.00   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   501.52   Sect/Pc #:  1/PCE 1F

ROCK = APHYRIC BASALT;
       Texture: SUBOPHITIC,APHYRIC,MEDIUM-GRAINED;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   55%)
             Size(mm):     .3X.05  Morphology: LATHS
             SLIGHTLY ALTERED;

             CLINOPYROXENE             (   50%)
             Size(mm):      .1X.1  Morphology: SUBHEDRAL
             EXTENSIVELY ALT;

             MAGNETITE                 (    5%)
             Size(mm):    .05X.03  Morphology: ANHEDRAL

Alteration - CLAY MINERALS             (   15%)
             Location: GROUNDMASS     Replacing: PYX + PLAG

Vesicles   -
             Size(mm):      1X1
             Percent:     1
             Location: SCATTERED
             Filling: EMPTY
             Shape: ROUND




Leg : 74    Top/Bottom Interval(mm):   80/ 110  Describer: Richardson, S.H.
Hole: 528   Top of Core Depth(m)   :   501.00   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   504.10   Sect/Pc #:  3/PCE 1B

ROCK = PLAG-OL-CPX PHYRIC BASALT
       EXTENSIVELY ALT;
       Texture: SUBOPHITIC,PHYRIC,MEDIUM-GRAINED;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE                   (   <1%)
             Size(mm):      1.5X1  Morphology: EUHEDRAL

             PLAGIOCLASE               (   25%)
             Size(mm):       10X5  Morphology: STUBBY LATHS,TWINNED,ZONED
             APPROX COMP LABRADORITE;

             CLINOPYROXENE             (   <1%)
             Size(mm):        2X2  Morphology: SUBHEDRAL
             APPROX COMP AUGITE, INTERGROWN WITH PLAG*

Groundmass - PLAGIOCLASE               (   36%)
             Size(mm):     .3X.05  Morphology: EUHEDRAL LATHS,TWINNED

             CLINOPYROXENE             (   34%)
             Size(mm):      .1X.1  Morphology: SUBHEDRAL

             MAGNETITE                 (    3%)
             Size(mm):    .05X.05  Morphology: ANHEDRAL

Alteration - CLAY MINERALS             (    5%)
             Location: GROUNDMASS     Replacing: PYX

Vesicles   -
             Percent:     0




Leg : 74    Top/Bottom Interval(mm):  380/ 410  Describer: Richardson, S.H.
Hole: 528   Top of Core Depth(m)   :   537.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   537.40   Sect/Pc #:  1/PCE 1E

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

Phenocrysts- PLAGIOCLASE               (    8%)
             Size(mm):        4X2  Morphology: STUBBY LATHS,TWINNED,ZONED

             CLINOPYROXENE             (   <1%)
             Size(mm):       1X.3  Morphology: SUBHEDRAL

Groundmass - PLAGIOCLASE               (   46%)
             Size(mm):     .4X.05  Morphology: EUHEDRAL LATHS

             CLINOPYROXENE             (   42%)
             Size(mm):      .1X.1  Morphology: SUBHEDRAL

             MAGNETITE                 (    3%)
             Size(mm):    .05X.03  Morphology: SKELETAL

Alteration - CLAY MINERALS             (    4%)
             Location: GROUNDMASS     Replacing: PYX

Vesicles   -
             Percent:     0




Leg : 74    Top/Bottom Interval(mm):  280/ 310  Describer: Richardson, S.H.
Hole: 528   Top of Core Depth(m)   :   546.00   Rock Type: IGNEOUS
Core:  47   Sample Midpoint(m)     :   549.30   Sect/Pc #:  3/PCE 1C

ROCK = APHYRIC BASALT;
       Texture: SUBOPHITIC,APHYRIC,MEDIUM-GRAINED;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   53%)
             Size(mm):     .3X.05  Morphology: EUHEDRAL LATHS

             CLINOPYROXENE             (   40%)
             Size(mm):     .1X.05  Morphology: SUBHEDRAL
             EXTENSIVELY ALT;

             MAGNETITE                 (    7%)
             Size(mm):    .03X.03  Morphology: ANHEDRAL

Alteration - CLAY MINERALS             (   20%)
             Location: GROUNDMASS     Replacing: PYX

Vesicles   -
             Size(mm):      1X1
             Percent:     1
             Location: PATCHY
             Filling: EMPTY OR PYRITE
             Shape: ROUNDED
             GROUNDMASS FINE-GRAINED NEAR VESICLES*




Leg : 74    Top/Bottom Interval(mm):  770/ 800  Describer: Richardson, S.H.
Hole: 528   Top of Core Depth(m)   :   546.00   Rock Type: IGNEOUS
Core:  47   Sample Midpoint(m)     :   549.78   Sect/Pc #:  3/PCE 3B

ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
       SLIGHTLY ALT;
       Texture: SUBOPHITIC,SPARSELY PHYRIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (    1%)
             Size(mm):        4X2  Morphology: LATHS
             SLIGHTLY ALT;

             CLINOPYROXENE             (   <1%)
             Size(mm):      .8X.3  Morphology: SUBHEDRAL

Groundmass - PLAGIOCLASE               (   50%)
             Size(mm):      .4X.1  Morphology: EUHEDRAL LATHS

             CLINOPYROXENE             (   42%)
             Size(mm):      .2X.1  Morphology: SUBHEDRAL
             EXTENSIVELY ALT;

             MAGNETITE                 (    7%)
             Size(mm):     .1-.03  Morphology: ANHEDRAL

Alteration - CLAY MINERALS             (   20%)
             Location: GROUNDMASS     Replacing: PYX

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.

Please see NOAA's privacy and disclaimer information. Send questions or comments to mgg.info@noaa.gov.

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