Core Data from the Deep Sea Drilling Project

Leg :  6    Top/Bottom Interval(mm):    0/   0  Describer: Melson, W.
Hole:  58   Top of Core Depth(m)   :    20.10   Rock Type: IGNEOUS
Core: B 1   Sample Midpoint(m)     :    20.10   Sect/Pc #:   /

ROCK = APHYRIC BASALT
       MAINLY DARK-BROWN TRANSLUCENT BASALTIC GLASS,
       PARTLY DEVITRIFIED,ENCODED FROM THE IR;
       Texture: VARIOLITIC,GLASSY;
       Where sampled: FROM BUMPER SUB,MARGIN OF PILLOW LAVA*

Phenocrysts- PLAGIOCLASE
             Size(mm):    4MMX5MM
             ZONED,1 XTL*

Groundmass - AUGITE                    (    5%)
             Morphology: MICROLITES

             PLAGIOCLASE               (    5%)
             Morphology: MICROLITES

             OLIVINE                   (    0%)
             POSSIBLY REPLACED BY A RARE HIGHLY BIREFRINGENT
             SECONDARY MINERAL*




Leg :  6    Top/Bottom Interval(mm):    0/   0  Describer: Melson, W.
Hole:  58   Top of Core Depth(m)   :    20.10   Rock Type: IGNEOUS
Core: B 1   Sample Midpoint(m)     :    20.10   Sect/Pc #:   /

ROCK = PLAG PHYRIC BASALT
       ENCODED FROM THE IR;
       Where sampled: FROM BUMPER SUB,SAMPLE PROBABLY FROM NEAR CONTACT
        OF SILL OR DIKE*

Phenocrysts- PLAGIOCLASE               (   10%)

Groundmass - COMBINATION               (   40%)
             Morphology: MICROLITES
             INCLUDES PLAG + AUGITE;

             MESOSTASIS                (   40%)
             Morphology: QUENCHED
             NEARLY OPAQUE,INCLUDES QUENCH XTLS OF PLAG + PYX
             + UNIDENTIFIABLE FINER-GRAINED MATERIAL + SKELETAL
             OXIDES WHICH COMPRISE 10% OF THE MESOSTASIS*




Leg :  6    Top/Bottom Interval(mm):    0/   0  Describer: Melson, W.
Hole:  58   Top of Core Depth(m)   :    20.10   Rock Type: IGNEOUS
Core: B 1   Sample Midpoint(m)     :    20.10   Sect/Pc #:   /

ROCK = OLIVINE BASALT
       ENCODED FROM THE IR;
       Where sampled: PROBABLY FROM PILLOW MARGIN,FROM BUMPER SUB*

Phenocrysts- OLIVINE                   (    5%)
             CONTAIN SMALL CHROMIAN SPINEL OCTAHEDRA, SHOWS
             STAIN FEATURES AND ROUNDED MARGINS (RESORBED -
             PERHAPS THESE XTLS ARE XENOCRYSTS)*

Groundmass - GLASS                     (   80%)
             SIDEROMELANE,FRESH,LIGHT BROWN;

             COMBINATION
             INCLUDES XTLLITES OF PLAG + OL + AUGITE*




Leg :  6    Top/Bottom Interval(mm):    0/   0  Describer: Melson, W.
Hole:  58   Top of Core Depth(m)   :    20.10   Rock Type: IGNEOUS
Core: B 1   Sample Midpoint(m)     :    20.10   Sect/Pc #:   /

ROCK = APHYRIC BASALT
       ENCODED FROM THE IR;
       Where sampled: PROBABLY FROM PILLOW MARGIN,FROM BUMPER SUB*

Groundmass - COMBINATION
             Morphology: MICROLITES
             INCLUDES PLAG + AUGITE IN DEVITRIFIED GLASS*

             DEVITRIFIED GLASS

Alteration - CHLORITE
             Location: ANGULAR
             Location: INCLUSIONS

             ACTINOLITE
             Location: ANGULAR
             Location: INCLUSIONS

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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