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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):   50/  70  Describer: Robinson, P.
Hole: 484A  Top of Core Depth(m)   :    55.50   Rock Type: IGNEOUS
Core:   7   Sample Midpoint(m)     :    55.56   Sect/Pc #:  1/PCE 1

ROCK = PLAG SPARSELY PHYRIC BASALT;
       Texture: MODERATELY PORPHYRITIC,QUENCH*

Phenocrysts- OLIVINE                   (   TR%)
             Size(mm):        0.5  Morphology: SUBHEDRAL
             FRESH,HIGH 2V,ASSOCIATED WITH PLAG,SOME COULD BE
             CPX;

             PLAGIOCLASE               (  1-2%)
             Size(mm):    0.5-2.5  Morphology: SUBHEDRAL,PRISMS
             OFTEN STRONGLY ZONED,FRESH*

Groundmass - OLIVINE                   (   TR%)
             Size(mm):       0.05  Morphology: SUBHEDRAL
             MINUTE XTLS WITH HIGH BIREFRINGENCE,OCTAHEDRAL
             SHAPE,PERCENTAGE QUESTIONABLE;

             MICROCRYST GROUNDMASS     (97-98%)
             INCLUDES OL + CPX + MAGN + PLAG,REMAINDER OF SLIDE
             IS A VERY FINE GRAINED QUENCHED MIXTURE OF OL +
             CPX + MINUTE MAGN + PLAG IN RADIAL SHEAF-LIKE
             AGGREGATES*

Vesicles   -
             Size(mm):  0.3-0.5
             Percent:    <1
             Shape: ROUND
             SOME SEGREGATION VESICLES,VESICLES ARE OPEN;




Leg : 65    Top/Bottom Interval(mm):   50/  70  Describer: Schmincke, H.
Hole: 484A  Top of Core Depth(m)   :    55.50   Rock Type: IGNEOUS
Core:   7   Sample Midpoint(m)     :    55.56   Sect/Pc #:  1/PCE 1

ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
       Texture: MODERATELY PORPHYRITIC,QUENCH*

Phenocrysts- OLIVINE                   (   <1%)
             Size(mm):         <2
             IN GLOMEROCRYSTS WITH PLAG;

             PLAGIOCLASE               (  2-3%)
             Size(mm):        1-3  Morphology: ANHEDRAL,PARTLY SKELETAL
             IN GLOMEROCRYSTS WITH OL;

             SPINEL                    (   TR%)
             Morphology: EUHEDRAL
             IDENTITY QUESTIONABLE*

Groundmass - OLIVINE                   (   <1%)
             Morphology: SKELETAL

             PLAGIOCLASE               (  5-7%)
             Size(mm):        0.5  Morphology: SKELETAL
             EXCELLENT SKELETAL;

             CLINOPYROXENE
             Morphology: SKELETAL

Alteration - SULFIDE
             PERVASIVE ON ONE SIDE*

Vesicles   -
             Size(mm):     <0.5
             Percent:    <1
             Shape: ROUND
             SOME SEGREGATION VESICLES*

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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.