Core Data from the Deep Sea Drilling Project

Leg :  6    Top/Bottom Interval(mm):   70/ 180  Describer: Melson, W.
Hole:  57A  Top of Core Depth(m)   :   320.60   Rock Type: IGNEOUS
Core:   4   Sample Midpoint(m)     :   328.23   Sect/Pc #:  6/PCE 2

ROCK = DOLERITE
       SOURCE IS IR;
       Texture: OPHITIC;
       Where sampled: SILL OR THICK LAVA FLOW*

Groundmass - PLAGIOCLASE               (   46%)
             Size(mm):       TO 5  Morphology: EUHEDRAL

             PYROXENE                  (   29%)
             Morphology: ANHEDRAL
             MAY INCLUDE MINOR AMOUNT OF PIGEONITE;

             OTHER                     (   14%)
             OTHER GROUNDMASS AND ALTERATION PRODUCTS;

             OLIVINE                   (    2%)
             Morphology: ANHEDRAL

             OXIDES                    (    8%)

             SPINEL                    (    0%)
             CHROMIAN;
             CONSPICUOUS CLOTS OF LARGE PLAG XTLS BOUNDED BY
             PYX+OL COMPRISE  APPROX 20% OF SAMPLE.MATRIX
             CONSISTS OF (1) OPHITIC AREAS CONTAINING OL
             GRANULES AND (2)PATCHES OF QUENCH MATERIAL RICH IN
             OXIDE SKELETAL XTLS.MATRIX XTL SIZE AVERAGES 0.5
             TO 1.0MM.PERCENTAGES OBTAINED BY MODAL ANALYSES.
             QUITE FRESH-ONLY FINE GRAINED INTERSTITIAL AREAS
             AND MARGINS AND CRACKS IN OL ARE ALTERED.OXIDES,
             PYX AND PLAG APPEAR UNAFFECTED.COARSELY XTLLINE
             CLOTS OF EUHEDRAL PLAG WITH GRANULES OF PYX AND
             PLAG ARE A DISTINCTIVE FEATURE OF THIS SAMPLE*

Alteration - ACTINOLITE
             MAIN ALTERATION IS A DARK GREEN GELATINOUS LOOKING
             ISOTROPIC MATERIAL.RARELY MINUTE PRISMS OF
             ACTINOLITE? OCCUR WITHIN THIS MATERIAL*

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.

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