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NOAA/NGDC
WDC MGG Seafloor Series Vol I

Core Data from the Deep Sea Drilling Project


Leg : 65    Top/Bottom Interval(mm): 1100/1120  Describer: Robinson, P.
Hole: 483C  Top of Core Depth(m)   :   105.00   Rock Type: IGNEOUS
Core:   4   Sample Midpoint(m)     :   107.61   Sect/Pc #:  2/PCE 7B

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,MEDIUM-GRAINED,INTERGRANULAR*

Groundmass - OLIVINE                   (    5%)
             Size(mm):   0.15-0.3  Morphology: SUBHEDRAL
             ALTERED TO SMEC,A FEW GRAINS WITH FRESH REMNANTS;

             PLAGIOCLASE               (50-55%)
             Size(mm):      0.2-1  Morphology: SUBHEDRAL,LATHS
             FRESH;

             CLINOPYROXENE             (35-40%)
             Size(mm):  0.05-0.25  Morphology: GRANULAR
             MOSTLY FRESH,MINOR ALTERATION TO CHLORITE?,2VZ=40;

             OPAQUE MINERALS           (  3-4%)
             Size(mm):  0.05-0.15  Morphology: SUBHEDRAL,SKELETAL
             INCLUDES MAGN + ILMENITE;

             MICROCRYST GROUNDMASS     (  1-2%)
             INTERSTITIAL MATERIAL,GLASSY TO MICROXLN PATCHES,
             ALTERED TO SMEC WITH MINOR APATITE + ?CHLORITE*

Alteration - SMECTITE
             Location: INTERSTITIAL,  Replacing: OL
             Location: VESICLES
             SOME OL + INTERSTITIAL MATERIAL REPLACED BY SMEC*

Vesicles   -
             Size(mm):  0.2-0.4
             Percent:    <1
             Filling: SMEC
             Shape: SPHERICAL




Leg : 65    Top/Bottom Interval(mm):  980/1010  Describer: Robinson, P.
Hole: 483C  Top of Core Depth(m)   :   105.00   Rock Type: IGNEOUS
Core:   4   Sample Midpoint(m)     :   112.00   Sect/Pc #:  5/PCE 8

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,MEDIUM-GRAINED,INTERGRANULAR*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.2-0.5  Morphology: SUBHEDRAL
             PARTLY ALTERED TO SMEC;

             PLAGIOCLASE               (   55%)
             Size(mm):    0.4-1.5  Morphology: SUBHEDRAL,LATHS
             FRESH;

             CLINOPYROXENE             (   35%)
             Size(mm):    0.1-0.3  Morphology: GRANULAR
             MOSTLY FRESH,SOME MARGINALLY ALTERED TO ?CHLORITE;

             OPAQUE MINERALS           (  2-3%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL,SKELETAL
             OFTEN SKELETAL,PROBABLY MAGN;

             MICROCRYST GROUNDMASS     (    1%)
             INTERSTITIAL MATERIAL,MOSTLY QUARTZ WITH MINOR
             APATITE;

             QUARTZ
             INTERSTITIAL,MICROXLN;

             APATITE
             INTERSTITIAL,MICROXLN*

Alteration -
             Location: VESICLES       Replacing: OL
             SOME OL ALTERED TO SMEC*

Vesicles   -
             Size(mm):  0.3-0.5
             Percent:    <1
             Filling: SMEC
             Shape: SPHERICAL

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These Web pages are from the Core Data from the Deep Sea Drilling Project Legs 1-96 CD-ROM produced 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, and collocated World Data Center for Marine Geology and Geophysics, Boulder. Data were compiled in cooperation with the U.S. Science Support Program, the Joint Oceanographic Institutions, Inc., and the U.S. National Science Foundation. Please see the NGDC privacy, disclaimer, and copyright notices.