NOAA logo, National Centers for Environmental Information, National Oceanic and Atmospheric Administration NSF logo, National Science Foundation, Division of Ocean Sciences

Core Data from the Deep Sea Drilling Project


Leg : 32    Top/Bottom Interval(mm): 1450/   0  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   297.50   Rock Type: IGNEOUS
Core:  12   Sample Midpoint(m)     :   298.95   Sect/Pc #:  1/

ROCK = BASALT
       SOURCE IS IR,




Leg : 32    Top/Bottom Interval(mm): 1450/   0  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   297.50   Rock Type: IGNEOUS
Core:  12   Sample Midpoint(m)     :   298.95   Sect/Pc #:  1/
       ONLY A VAGUE SUGGESTION OF FORMER IGNEOUS TEXTURE,
       ROCK IS NOW COMPOSED OF CLEAR PATCHES OF
       MONTMORILLONITE,TINY RED GRANULES OF GOETHITE(?)
       AND PATCHES OF A MURKY MATERIAL(X-RAY ANALYSIS
       OF A SAMPLE SEVERAL CM REMOVED SHOWS THE PRESENCE
       OF K-FELDSPAR,CELADONITE,CHLORITE AND
       MONTMORILLONITE)*

Alteration - MONTMORILLONITE

             GOETHITE
             ID UNCERTAIN FOR GOETHITE*




Leg : 32    Top/Bottom Interval(mm):  770/   0  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   307.77   Sect/Pc #:  1/PCE 3

ROCK = BASALT
       ALTERED;

Phenocrysts- PLAGIOCLASE
             Size(mm):          1
             GLOMEROPHENOS-SCATTERED*

Groundmass - PLAGIOCLASE
             Size(mm):     .02X.2  Morphology: LATHS
             FAIRLY SEVERELY ALTERED;

             PYROXENE
             Size(mm):       .075
             TOTALLY ALTERED TO MONTMORILLONITE(?);

             MAGNETITE
             SEVERELY ALTERED TO UNIDENTIFIED MINERAL*




Leg : 32    Top/Bottom Interval(mm):  780/ 820  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   307.80   Sect/Pc #:  1/

ROCK = BASALT
       SOURCE IS IR*

Groundmass - PYROXENE
             ALTERED TO MONTMORILLONITE;

             OPAQUE MINERALS
             CLOUDS OF DARK GRANULAR MATERIAL HAVE REPLACED
             AND RETAIN THE FORM OF THE SKELETAL OPAQUES;

             PLAGIOCLASE
             HIGHLY ALTERED,X-RAY ANALYSIS SHOWS THE SAMPLE TO
             CONSIST OF A LITTLE PLAG,MUCH K-FELDSPAR,AS WELL
             AS CELADONITE AND MONTMORILLONITE*

Alteration - MONTMORILLONITE
             Replacing: PYX




Leg : 32    Top/Bottom Interval(mm): 1460/   0  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   308.46   Sect/Pc #:  1/PCE 9

ROCK = BASALT;
             SAME AS 13-1-77 EXCEPT PLAG AND MAGNETITE LESS
             ALTERED*




Leg : 32    Top/Bottom Interval(mm):  270/ 290  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   308.78   Sect/Pc #:  2/

ROCK = BASALT
       SOURCE IS IR;
       Texture: INTERGRANULAR*

Phenocrysts- PLAGIOCLASE
             OCCASIONAL PHENOS*

Groundmass - PLAGIOCLASE
             Morphology: LATHS
             MOSTLY FRESH;

             PYROXENE
             SOMEWHAT FEATHERY,MOSTLY FRESH*

Alteration - MONTMORILLONITE
             Location: VESICLES,      Replacing: PYX
             Location: PATCHES
             GREEN,THERE ARE RED COLORED AREAS(GOETHITE-STAINED
             MONTMORILLONITE?)WHERE THE ALTERATION,ESPECIALLY
             OF PYX,IS MUCH MORE INTENSE*

Vesicles   -
             Filling: MONTMORILLONITE




Leg : 32    Top/Bottom Interval(mm):  800/ 820  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   309.31   Sect/Pc #:  2/

ROCK = BASALT
       SOURCE IS IR;
       Texture: PLUMOSE
       FINER GRAINED THAN 32-307-13-2-27-29 AND THEREFORE
       PROBABLY CLOSER TO THE CRUST,YET LESS ALTERED*

Groundmass - PLAGIOCLASE
             Morphology: MICROLITES
             SCATTERED*

Alteration - MONTMORILLONITE
             PATCHES OF GREEN MONTMORILLONITE BETWEEN THE
             FIBROUS PLUMES*




Leg : 32    Top/Bottom Interval(mm):  870/   0  Describer: Marshall, M.
Hole: 307   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  13   Sample Midpoint(m)     :   309.37   Sect/Pc #:  2/PCE 13

ROCK = BASALT AND BRECCIA
       ALTERED;
       Texture: FEATHERY,FINE-GRAINED*

Groundmass - PLAGIOCLASE
             Size(mm):     .02X.2  Morphology: LATHS

             PYROXENE
             Size(mm):         .1  Morphology: FEATHERY
             SOME ALTERATION OF PLAG AND PYX,HARD TO ESTIMATE
             BECAUSE OF FEATHERY,FINE GRAINED XTLS*




    

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.

Department of Commerce > NOAA > NESDIS > NCEI > doi:10.7289/V54M92G2