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Core Data from the Deep Sea Drilling Project


Leg : 30    Top/Bottom Interval(mm):  730/ 740  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   236.00   Rock Type: IGNEOUS
Core:  16   Sample Midpoint(m)     :   236.74   Sect/Pc #:  1/

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

Phenocrysts- PLAGIOCLASE               (15-20%)
             Size(mm):         <5  Morphology: EUHEDRAL
             OFTEN AS GLOMEROCRYSTS OF UP TO 10 XTLS,SOME WEAK
             OSCILLATORY ZONING,SOME SHOW RESORPTION ON EDGES,
             ALSO DEFINITELY A CYCLIC HISTORY OF GROWTH-
             RESORPTION-REGROWTH-ETC.,OFTEN EUHEDRAL PLAG
             (APPROX COMP BYTOWNITE(>AN70))SHOW SODIC RIMS WITH
             SHARP CONTACT WITH REST XTLS OF APPROX .005MM
             THICKNESS,ABUNDANT MINERAL INCLUSIONS,ORIENTED IN
             CORES OF PHENOS(USUALLY RESTRICTED TO INNER THIRD)
             ID UNCERTAIN-UNUSUAL,VISUAL ESTIMATES OF ALL
             PERCENTAGES;

             OLIVINE                   (    5%)
             Size(mm):       <1.5
             PSEUDOMORPHS-REPLACED BY SERPENTINE+LESSER
             CALCITE*

Groundmass - PLAGIOCLASE
             Size(mm):        <.2  Morphology: ACICULAR+HOLLOW
             MAY HAVE BEEN GLASS INTERSTITIAL TO PLAG;

             PYROXENE
             DEFINITELY REPLACED BY CHLORITE;

             OTHER
             Size(mm):        <.1  Morphology: CUBIC
             DEEP RED MINERAL-ID UNCERTAIN(MAGNETITE ALTERED TO
             HEMATITE,AL-CR SPINEL OR PEROVSKITE)*

Alteration - SERPENTINITE
             Replacing: OL

             CALCITE
             Replacing: OL

             CHLORITE
             Location: PATCHES,VOIDS  Replacing: GROUNDMASS     IRREGULAR
             Replacing: GLASS+MAFICS
             ID UNCERTAIN FOR VOID FILLINGS AND GLASS
             REPLACEMENT*




Leg : 30    Top/Bottom Interval(mm): 1160/   0  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   236.00   Rock Type: IGNEOUS
Core:  16   Sample Midpoint(m)     :   237.16   Sect/Pc #:  1/

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

Phenocrysts- PLAGIOCLASE               (15-20%)
             SEE 30-287-16-1-73-74 AND 17-CC;

             OLIVINE                   ( 0-<1%)
             VERY DIFFICULT TO SPOT ANY POSSIBLE PSEUDOMORPHS
             AFTER OL-IF ANY PRESENT DEFINITELY <1%*

Groundmass - PLAGIOCLASE
             Size(mm):         .2  Morphology: MICROLITES

             PYROXENE
             Size(mm):        .04  Morphology: SUBVARIOLITIC+FAN-SHAPED

             Morphology: PLUMOSE
             QUITE FRESH;

             MAGNETITE
             Size(mm):      <.025  Morphology: EUHEDRAL+CLOTS

             OTHER
             Size(mm):        <.1  Morphology: EUHEDRAL CUBIC
             DEEP RED-NOT OXIDIZED MAGN*

Alteration - CHLORITE
             Replacing: GLASS
             PROBABLY NO PYX CHLORITIZED AS PYX SO FRESH*




Leg : 30    Top/Bottom Interval(mm):  680/   0  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   238.00   Rock Type: IGNEOUS
Core:  17   Sample Midpoint(m)     :   240.18   Sect/Pc #:  2/

ROCK = PLAG PHYRIC BASALT;
       Texture: PHYRIC,INTERSERTAL*

Phenocrysts- PLAGIOCLASE

             OLIVINE                   (    0%)

Groundmass - PLAGIOCLASE
             Size(mm):      .4-.5

             MAGNETITE
             Size(mm):       <.05

             PYROXENE
             Morphology: RADIATING CLUSTERS
             ABUNDANT,APPROX 2/3 ALTERED TO CHLORITE*

Alteration - CALCITE
             Location: VEINS

             CHLORITE
             Location: VEINS

             SERPENTINITE
             Location: VEINS          Replacing:                FIBROUS
             ID UNCERTAIN FOR SERPENTINE*




Leg : 30    Top/Bottom Interval(mm):    0/   0  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   238.00   Rock Type: IGNEOUS
Core:  17   Sample Midpoint(m)     :   242.60   Sect/Pc #: CC/

ROCK = PLAG-OL PHYRIC BASALT;
       Texture: PHYRIC,INTERSERTAL,SUBOPHITIC
       RATHER LIKE A DIABASIC TEXTURE*

Phenocrysts- OLIVINE                   (  5.2%)
             Size(mm):       <2.5
             FRESH,MEASURED ON LONG AXIS, ALL PERCENTAGES
             DETERMINED BY POINT COUNT,FRESH BUT USUALLY HAVE
             SERPENTINE ALONG THE FRACTURES,USUALLY 1/5-1/3 OF
             XTL REPLACED;

             PLAGIOCLASE
             Size(mm):       <2.5
             APPROX COMP BYTOWNITE(>AN70),OFTEN GLOMEROCRYSTIC
             WITHOUT OL PHENOS,MODERATE NORMAL ZONING AND
             OCCASIONAL WEAK OSCILLATORY ZONING,ROUND CORES
             AND THEIR ORIENTATION RELATIVE TO REST OF XTL
             DEFINITELY INDICATE CYCLES OF RESORPTION AND
             REGROWTH,CENTRAL AREAS USUALLY WITH LARGE ORIENTED
             UNIDENTIFIED MINERAL INCLUSIONS(UNUSUAL)*

Groundmass - PLAGIOCLASE               ( 25.6%)
             Size(mm):       .3-.  Morphology: 4

             PYROXENE                  (   45%)
             WELL DEVELOPED AS SINGLE XTLS,NO TENDENCY TO
             TO DEMONSTRATE RADIATING HABIT;

             OLIVINE                   (    3%)

             MAGNETITE                 (    4%)

             OTHER
             Size(mm):        <.1  Morphology: CUBIC
             SPARE DEEP RED ISOTROPIC MINERAL SOMETIMES
             INCLUDED IN OL USUALLY IN GROUNDMASS,PROBABLY
             CR-SPINEL*

Alteration - CHLORITE
             Location: GROUNDMASS
             SMALL AMOUNT;

             SERPENTINITE
             Replacing: OL

Vesicles   -
             Size(mm):      <.3
             Percent:    .4
             Filling: CHLORITE
             RARE AMYGDULES*




Leg : 30    Top/Bottom Interval(mm):  440/ 470  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   242.50   Rock Type: IGNEOUS
Core:  18   Sample Midpoint(m)     :   242.96   Sect/Pc #:  1/

ROCK = PLAG-OL PHYRIC BASALT;
       Texture: PHYRIC*

Phenocrysts- PLAGIOCLASE

             OLIVINE
             PSEUDOMORPHED BY CHLORITE+SOME UNKNOWN MINERAL,
             APPEARS TO BE INTERMEDIATE STAGE IN ALTERATION,
             CORES HAVE BROWNISH GRANULAR MINERAL WHICH GIVES
             PARALLEL EXTINCTION*

Groundmass - PLAGIOCLASE
             Size(mm):         .2
             AVE. LENGTH GIVEN;

             PYROXENE
             FRESH,SHOWS DISTINCT SUBVARIOLITIC HABIT;

             MAGNETITE

             GLASS
             VERY POSSIBLE THAT PRESENT CHLORITE WAS GLASS;

             OTHER
             Size(mm):       <.07  Morphology: EUHEDRAL+SQUARE OUTLINES
             DEEP RED ABUNDANT MINERAL*

Alteration - CHLORITE
             Location: VEINS,         Replacing: OL,GLASS
             Location: GROUNDMASS
             ABUNDANT IN GROUNDMASS;

             CALCITE
             Location: VEINS
             CHLORITE>>CALCITE*

Vesicles   -
             Size(mm):      <.3
             Filling: CHLORITE
             RARE AMYGDULES*




Leg : 30    Top/Bottom Interval(mm):  480/ 500  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   242.50   Rock Type: IGNEOUS
Core:  18   Sample Midpoint(m)     :   242.99   Sect/Pc #:  1/

ROCK = PLAG-OL SPARSELY PHYRIC BASALT;
       Texture: SPARSELY PHYRIC,INTERSERTAL,HOLOXTLLINE*

Phenocrysts- PLAGIOCLASE               (    1%)
             Size(mm):       <1.5
             MEASURED ALONG LONG AXIS,APPROX COMP AN70 BY
             CARLSBAD-ALBITE METHOD;

             OLIVINE
             Size(mm):        <.6
             CHLORITE PSEUDOMORPHS AFTER OL,MEASURED ALONG LONG
             AXIS*

Groundmass - PLAGIOCLASE
             Size(mm):       <.03

             PYROXENE                  (    0%)
             CHLORITIZED,APPEARS WERE IN BUNDLES OR
             SUBVARIOLITIC;

             GLASS
             NOT POSSIBLE TO TELL IF WAS ORIGINALLY PRESENT
             BECAUSE OF CHLORITIZATION*

Alteration - CHLORITE
             Replacing: PYX+OL+GLASS

Vesicles   -
             Size(mm):     <1.5
             Percent:     2
             Filling: CHLORITE
             Shape: ROUND+

             Shape: IRREGULAR
             AMYGDULES,SIZE IS FOR ROUND-FOR IRREGULAR IS <4MM*




Leg : 30    Top/Bottom Interval(mm): 1460/1500  Describer: Stoeser, D.
Hole: 287   Top of Core Depth(m)   :   242.50   Rock Type: IGNEOUS
Core:  18   Sample Midpoint(m)     :   243.98   Sect/Pc #:  1/

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

Phenocrysts- PLAGIOCLASE               (    2%)
             Size(mm):         <1  Morphology: TABULAR
             CORE APPROX COMP AN70 BY CARLSBAD-ALBITE METHOD,
             ODD CROSS-SECTIONS OR EACH QUADRANT WILL GO
             EXTINCT AT DIFFERENT ANGLE,OFTEN NORMALLY ZONED,
             2V 85DEGREES;

             OLIVINE                   (    1%)
             Size(mm):         <1
             PSEUDOMORPHED BY SERPENTINE?+CACO3 AND CHLORITE,
             OUTLINES POORLY PRESERVED,OL PHENO OCCASIONALLY
             INTERGROWN WITH PLAG PHENO*

Groundmass - PLAGIOCLASE               (   40%)
             Morphology: ACICULAR
             SQUARE CROSS-SECTIONS;

             MAGNETITE                 (    5%)
             % DIFFICULT TO ESTIMATE(ALL PERCENTAGES BY VISUAL
             ESTIMATE),QUENCH(APPROX DENDRITIC)*

Alteration - CHLORITE
             Replacing: PYX,OL
             PLAG ONLY SLIGHTLY AFFECTED;

             CALCITE
             Location: VEINS

             SERPENTINITE
             Replacing: OL

Vesicles   -
             Size(mm):      <.5
             Percent:    <1
             Filling: CHLORITE
             Shape: ROUND
             AMYGDULES,PERFECTLY ROUND*




    

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