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Core Data from the Deep Sea Drilling Project


Leg : 29    Top/Bottom Interval(mm):  350/ 430  Describer: Ridley, W.
Hole: 282   Top of Core Depth(m)   :   294.00   Rock Type: IGNEOUS
Core:  18   Sample Midpoint(m)     :   297.39   Sect/Pc #:  3/

ROCK = BASALT
       HIGHLY ALTERED;
       Texture: FINE-GRAINED,RADIATE
       GROUNDMASS HIGHLY ALTERED BUT ORIGINAL RADIATE
       TEXTURE HAS BEEN PRESERVED*

Groundmass - FELDSPAR
             Morphology: LATHS
             SMALL,HAVE GREENISH CORES OF SERICITE AND
             INTERSTITIAL PATCHES OF EPIDOTE AND CHLORITE;

             OPAQUE MINERALS           (  3-4%)
             Size(mm):      .1-.5
             OXIDIZED,ID UNCERTAIN,WITH CRENULATE MARGINS;

             OLIVINE
             REPLACED BY SERPENTINE*

Alteration - SERPENTINITE              (    2%)
             Replacing: OL
             UP TO 1MM IN SIZE-AVERAGE .3MM,FREQUENTLY CONTAINS
             REDDISH-BROWN GRAINS OF CHROME SPINEL;

             CLAY MINERALS
             Replacing: FELDSPAR
             INCLUDES SERICITE,EPIDOTE AND CHLORITE*




Leg : 29    Top/Bottom Interval(mm): 1260/1340  Describer: Ridley, W.
Hole: 282   Top of Core Depth(m)   :   298.00   Rock Type: IGNEOUS
Core:  19   Sample Midpoint(m)     :   299.30   Sect/Pc #:  1/

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

Groundmass - PLAGIOCLASE
             Size(mm):      .2-.3  Morphology: LATHS

             PYROXENE
             VERY FINE GRAINED,SUBRADIATE;

             TITANOMAGNETITE
             INTERGROWN WITH PYX*

Alteration - IDDINGSITE
             Replacing: OL
             RARE PSEUDOMORPHS OF ANTIGORITE-IDDINGSITE
             INTERGROWTHS AFTER MICROPHENO OL;

             SERPENTINITE
             Replacing: GLASS
             IRREGULAR AREAS,PROBABLY ORIGINALLY GLASS,ARE NOW
             ALTERED TO SPHERULITE-LIKE,LAYERED INTERGROWTHS
             OF IDDINGSITE AND SERPENTINE?*




Leg : 29    Top/Bottom Interval(mm):  450/ 530  Describer: Ridley, W.
Hole: 282   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  20   Sample Midpoint(m)     :   310.49   Sect/Pc #:  3/

ROCK = PLAG MODERATELY MICROPHYRIC BASALT;
       Texture: MODERATELY MICROPHYRIC,FINE-GRAINED,SUBTRACHYTIC
       WITH FLOWAGE ALIGNMENT OF SMALL PLAG LATHS*

Phenocrysts- PLAGIOCLASE               (    5%)
             Size(mm):         .5
             AVERAGE SIZE GIVEN,RARE GRAINS UP TO 1.5MM,CORES
             REPLACED BY CHLORITE AND CALCITE,PHENOS ASSOCIATED
             WITH IDDINGSITIZED OL PSEUDOMOPRHS CONTAINING
             REDDISH-BROWN SPINEL*

Groundmass - OLIVINE
             PSEUDOMORPHED BY IDDINGSITE;

             PLAGIOCLASE

             PYROXENE
             INTERSTITIAL AREAS TO LATHS CONTAIN "HERRINGBONE"             PYX NUCLEATED ON PLAG,SUBSEQUENTLY ALTERED TO A
             REDDISH-BROWN MINERAL*

Alteration - IDDINGSITE
             Replacing: OL

             CALCITE
             Location: VEINS
             SECONDARY VEINS OF PLATY CALCITE CUT THROUGH ROCK*




    

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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