Core Data from the Deep Sea Drilling Project

Leg : 29    Top/Bottom Interval(mm):  880/ 960  Describer: Ridley, W.
Hole: 280A  Top of Core Depth(m)   :   519.00   Rock Type: IGNEOUS
Core:  23   Sample Midpoint(m)     :   519.92   Sect/Pc #:  1/

ROCK = BASALT
       PARTLY ALTERED;
       Texture: INTERGRANULAR-SUBOPHITIC*

Groundmass - PLAGIOCLASE
             Morphology: LATHS

             CLINOPYROXENE
             Morphology: PLATES
             ORIGINAL TEXTURE PRESERVED IN FRESH PATCHES OF CPX
             PLATES ENCLOSING SMALL PLAG LATHS;

Alteration - CHLORITE
             Replacing: CPX,PLAG
             PARTLY REPLACES PLAG;

             CALCITE
             Location: VEINS
             ROCK CUT BY VEINS OF PLATY CALCITE ASSOCIATED
             WITH EPIDOTE AND FIBROUS CHLORITE*




Leg : 29    Top/Bottom Interval(mm):  370/ 410  Describer: Ridley, W.
Hole: 280A  Top of Core Depth(m)   :   519.00   Rock Type: IGNEOUS
Core:  23   Sample Midpoint(m)     :   523.89   Sect/Pc #:  4/

ROCK = BASALT;
       Texture: RADIATE TO SPHERULITIC,FINE-GRAINED*

Phenocrysts- PLAGIOCLASE
             Morphology: LATHS
             RARE,ZONED,SHOWS PATCHY REPLACEMENT BY SERICITE*

Groundmass - CLINOPYROXENE
             Morphology: DENDRITIC
             NOW ALTERED FORMS DENDRITIC XTLS WITH INTERSTITIAL
             EPIDOTE;

             OLIVINE
             OCCASIONAL CLOTS OF SMALL ALTERED OL GRAINS*

Alteration - EPIDOTE
             Replacing: GLASS
             LARGE AREAS PROBABLY REFLECTING ORIGINAL GLASSY
             AREAS;

             CALCITE
             Location: VEINS
             ROCK CUT BY VEINS OF PLATY CALCITE ASSOCIATED
             WITH FIBROUS ANTIGORITE AND LENTICULAR PATCHES OF
             SERPENTINE*




Leg : 29    Top/Bottom Interval(mm): 1100/1180  Describer: Ridley, W.
Hole: 280A  Top of Core Depth(m)   :   519.00   Rock Type: IGNEOUS
Core:  23   Sample Midpoint(m)     :   524.64   Sect/Pc #:  4/

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

Phenocrysts- PLAGIOCLASE
             Size(mm):       TO 2  Morphology: LATH-LIKE

             OLIVINE
             Size(mm):         <1
             REPLACED BY SERPENTINE*

Groundmass - PLAGIOCLASE
             Morphology: LATHS
             SMALL,ALSO PRESENT ARE RARE CORRODED FRAGMENTS OF
             PLAG XENOCRYSTS UP TO 1MM LONG*

             CLINOPYROXENE
             PALE BROWN TO COLORLESS CPX INTERGRANULAR TO SMALL
             PLAG LATHS;

             OLIVINE
             SMALL SERPENTINIZED GRAINS;

             TITANOMAGNETITE
             GROUNDMASS HAS AN AVERAGE GRAIN SIZE OF .05-.1MM*

Alteration - CHLORITE
             SCATTERED AREAS OF ALTERATION CONTAINING MAINLY
             CHLORITE*

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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