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NOAA/NGDC
WDC MGG Seafloor Series Vol I

Core Data from the Deep Sea Drilling Project


Leg : 84    Top/Bottom Interval(mm):    0/   0  Describer: Helm, R.
Hole: 566   Top of Core Depth(m)   :    31.40   Rock Type: METAMORPHIC
Core:   6   Sample Midpoint(m)     :    32.36   Sect/Pc #: CC/

ROCK = SERPENTINITE
       YOUNGER SERPENTINE (CHRYSOTILE) FILLS
       CROSS-CUTTING VEINS, PROBABLY FORMED DURING
       WEATHERING;
       Texture: RIBBON;
       Where sampled: CLAST IN SERPENTINE-BRECCIA*

Phenocrysts- OLIVINE                   (   TR%)

             CLINOPYROXENE             (   TR%)
             EXSOLUTION LAMELLAE;

             SPINEL                    (   TR%)
             CHROMITE;

             ORTHOPYROXENE             (   TR%)
             Morphology: BASTITE
             BASTITES,PORPHYROCLASTIC TEXTURE*

Groundmass - OLIVINE
             MOST LIKELY MANTLE DUNITE-HARZBURGITE,
             PROPHYROCLASTIC TEXTURE OPX, ALTERATION OF MAFIC
             MINERALS TO SERPENTINE UNDER A HIGH STRESS RATIO,
             CHROMITE SHOWS ALTERATION TO FE3O4, EVEN THE
             MAGNETITE IS FOLIATED*

Alteration - BRUCITE                   (   TR%)

             MAGNETITE                 (   10%)

             ACTINOLITE                (    0%)

             TREMOLITE                 (    0%)
             NO SECONDARY METAMORPHIC MINERALS;

             SERPENTINITE              (   90%)
             TWO GENERATIONS*




Leg : 84    Top/Bottom Interval(mm):   10/  30  Describer: Ogawa, Y.
Hole: 566   Top of Core Depth(m)   :    41.10   Rock Type: METAMORPHIC
Core:   7   Sample Midpoint(m)     :    41.12   Sect/Pc #:  1/

ROCK = SERPENTINITE
       ORIGINALLY HARZBURGITE;
       Texture: GRANULAR*

Phenocrysts- PLAGIOCLASE               (    0%)

             CLINOPYROXENE             (    1%)
             POSSIBLY AUGITE;

             SPINEL                    (    1%)
             CHROMSPINEL;

             ORTHOPYROXENE             (   13%)
             POSSIBLY HYPERSTHENE;

             OPAQUE MINERAL            (    5%)

Alteration - CARBONATE                 (   TR%)




Leg : 84    Top/Bottom Interval(mm):   20/   0  Describer: Bourgois, J.
Hole: 566   Top of Core Depth(m)   :    41.10   Rock Type: METAMORPHIC
Core:   7   Sample Midpoint(m)     :    41.12   Sect/Pc #:  1/

ROCK = SERPENTINITE*

Phenocrysts- PLAGIOCLASE               (    0%)

             OLIVINE                   (   TR%)

             CLINOPYROXENE             (   TR%)

             SPINEL                    (   TR%)
             CHROMITE*

Groundmass - MAGNETITE                 (   10%)

             ORTHOPYROXENE             (   20%)
             SERPENTINIZED*

Alteration - SERPENTINITE              (   85%)

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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.