Core Data from the Deep Sea Drilling Project

Leg : 29    Top/Bottom Interval(mm):  400/ 460  Describer: Ridley, W.
Hole: 279A  Top of Core Depth(m)   :   194.00   Rock Type: IGNEOUS
Core:  12   Sample Midpoint(m)     :   194.43   Sect/Pc #:  1/

ROCK = BASALT;
       Texture: FINE-GRAINED,VESICULAR,INTERGRANULAR*

Groundmass - PLAGIOCLASE               (   <2%)
             MICROPHENOS;

             TITANOMAGNETITE
             FORM INTERGRANULAR TO PLAG;

             CLINOPYROXENE
             PALE BROWN;

             OLIVINE
             Morphology: SUBHEDRAL
             INTERGRANULAR TO PLAG LATHS*

Alteration - MONTMORILLONITE
             Location: IRREGULAR      Replacing: MESOSTAS GLASS
             Location: PATCHES
             MAY ALSO FORM A THIN VESICLE LINING*

Vesicles   -
             Filling: PYX+ILMENITE
             SOME VESICLES PARTLY FILLED WITH A VERY FINE
             GRAINED INTERGROWTH OF PYX AND ELONGATE,SKELETAL
             ILMENITE*




Leg : 29    Top/Bottom Interval(mm):  870/ 930  Describer: Ridley, W.
Hole: 279A  Top of Core Depth(m)   :   199.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   199.90   Sect/Pc #:  1/

ROCK = BASALT;
       Texture: FINE-GRAINED,INTERSERTAL*

Phenocrysts- PLAGIOCLASE
             Size(mm):      .5X.3
             VERY RARE PHENOS*

Groundmass - PLAGIOCLASE
             Morphology: LATH-SHAPED

             OLIVINE
             INTERGRANULAR,FRESH;

             CLINOPYROXENE
             NORMALLY AND SECTIONALLY ZONED;

             TITANOMAGNETITE
             AVERAGE GROUNDMASS GRAIN SIZE IS .1MM*

Alteration - MONTMORILLONITE
             Replacing: MESOSTAS GLASS
             FINE GRAINED*

Vesicles   -
             Percent:    <3
             <3% SMALL VESICLES,VERY RARE LARGER,ROUNDED
             VESICLES*




Leg : 29    Top/Bottom Interval(mm): 1260/1300  Describer: Ridley, W.
Hole: 279A  Top of Core Depth(m)   :   199.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   201.78   Sect/Pc #:  2/

ROCK = PLAG MODERATELY PHYRIC BASALT;
       Texture: COARSE-GRAINED,INTERSERTAL*

Phenocrysts- PLAGIOCLASE               (    3%)
             Size(mm):         <2  Morphology: TABULAR
             ZONED,ASSOCIATED WITH CPX*

Groundmass - CLINOPYROXENE             (   25%)
             Size(mm):         <1
             ZONED,TWINNED-NORMALLY ZONED,RARELY SECTORIALLY
             ZONED;

             PLAGIOCLASE               (   52%)

             TITANOMAGNETITE           (    2%)

             MESOSTASIS                (   20%)
             MESOSTATIC GLASS-ABUNDANT,OFTEN ALTERED TO
             CHLORITE,EPIDOTE,ZEOLITE,WITH ABUNDANT BROWN,SHEET
             LIKE PATCHES OF BROWN BIOTITE*

Alteration - CLAY MINERALS
             Replacing: MESOSTAS GLASS
             INCLUDES CHLORITE,EPIDOTE AND ZEOLITE*

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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