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Core Data from the Deep Sea Drilling Project


Leg : 17    Top/Bottom Interval(mm):    0/   0  Describer: Moberly, R.
Hole: 166   Top of Core Depth(m)   :   250.00   Rock Type: TUFF
Core:  23   Sample Midpoint(m)     :   253.10   Sect/Pc #: CC/

ROCK = VITRIC TUFF
       ALTERED,DOMINATED BY LIGHT GLASS AND ALTERED
       GLASS,THE LIGHT GLASS MAINLY SPLINTERY ANGULAR
       SHARDS,COMMONLY FROTHY*

Groundmass - PLAGIOCLASE
             SOME GRAINS, LAMINATION SHOWN BY BOTH GRAIN SIZE
             AND BY ALIGNMENT OF SOME ELONGATE GRAINS,MOST
             GRAINS APPROX .05MM,ALMOST CERTAINLY PYROCLASTIC*

Alteration - CHLOROPHAEITE

             SERPENTINITE
             MANY GRAINS ALTERED TO TURBID GREEN OR BROWN
             CHLOROPHAEITE AND SERPENTINE;

             ANALCIME
             Location: CEMENT,VEINS
             COMMON AS A PATCHY CEMENT,AS VEINLETS AND AS
             IRREGULAR SPHERES IN THE CLAYEY(MONTMORILLONITE?)
             INTERGRANULAR PARTS OF THE ROCK*




Leg : 17    Top/Bottom Interval(mm):    0/   0  Describer: Moberly, R.
Hole: 166   Top of Core Depth(m)   :   270.00   Rock Type: TUFF
Core:  25   Sample Midpoint(m)     :   271.60   Sect/Pc #: CC/

ROCK = VITRIC TUFF
       ALTERED,FORAMINIFERAL*

Groundmass - GLASS
             MAINLY ANGULAR GRAINS OF DARK GLASS,LARGELY
             ALTERED TO CHLOROPHAEITE AND RIMMED WITH A FILM
             OF FIBROUS ZEOLITE,POSSIBLY REWORKED FROM A NEARBY
             HYALOCLASTIC DEPOSIT,POSSIBLY PYROCLASTIC*

Alteration - CALCITE
             SPHERES OF CALCITE(SOME SHOW "PSEUDOISOGYRES" AND
             PERFORATED TESTS OF FORAMS FILLED WITH SPARRY
             CALCITE)ABUNDANT,SOME PATCHY POIKILITIC CALCITE
             BUT MAINLY A MATRIX OF GREEN CLAY,AVERAGE GRAIN
             SIZE APPROX .1MM,FORAMS TO .2MM*




Leg : 17    Top/Bottom Interval(mm): 1230/      Describer: Bass, M.
Hole: 166   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   308.23   Sect/Pc #:  1/

ROCK = PLAG-OL-CPX MICROPHYRIC BASALT
       SOURCE IS IR,SEE P.481,ALTERED;
       Texture: MICROPHYRIC,SPHERULITIC TO VARIOLITIC*

Phenocrysts- PLAGIOCLASE
             MICROPHENOS,APPROX COMP AN64 TO AN75,MORE
             ABUNDANT THAN IN OL;

             OLIVINE
             Morphology: PSEUDOMORPHS
             MICROPHENOS,COMPLETELY ALTERED;

             PYROXENE
             MICROPHENOS*

Groundmass - GLASS
             ALTERED TO YELLOW+ORANGE BROWN OR DEEP RED BROWN
             MONT*

Alteration - MONTMORILLONITE
             Replacing: OL,GLASS
             BOWLINGITE;

             FERROUS OXIDE
             Replacing: OL,GLASS




Leg : 17    Top/Bottom Interval(mm): 1230/   0  Describer: Moberly, R.
Hole: 166   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   308.23   Sect/Pc #:  1/

ROCK = BASALT
       ALTERED;
       Texture: HYPOXTLLINE,SLIGHTLY VESICULAR,GLOMEROPHYRIC,
       VARIOLITIC
       TEXTURE GIVEN IS ORIGINAL TEXTURE*

Phenocrysts- PLAGIOCLASE
             Size(mm):  TO .5X.75  Morphology: LATHS
             APPROX COMP SODIC LABRADORITE,COMMONLY WITH PAINT
             BRUSH ENDS(ALKALIC OVERGROWTHS?);

             OLIVINE
             Size(mm):     TO .35
             NOW ANTIGONITE AND IDDINGSITE;

             OPAQUE MINERALS
             Morphology: EQUANT

             AUGITE

Groundmass - PLAGIOCLASE
             Morphology: VARIOLITIC MICROLITES

             GLASS
             NOW SHEAVES OF MONTMORILLONITE AND BROWN CHLORITE,
             DUSTED WITH OPAQUES*

Alteration - MONTMORILLONITE
             Location: AMYGDULES      Replacing: GLASS

             CHLORITE
             Location: AMYGDULES      Replacing: GLASS

Vesicles   -
             Size(mm):    TO .5
             Filling: MONT+CHLORITE+

             Filling: HEMATITE
             ID UNCERTAIN FOR HEMATITE(RED-BROWN MINERAL).
             AMYGDULES*




Leg : 17    Top/Bottom Interval(mm):  160/ 250  Describer: Bass, M.
Hole: 166   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   308.71   Sect/Pc #:  2/

ROCK = BASALT
       SOURCE IS IR,SEE P.481;
       Texture: CHILLED,MICROPHYRIC,GROUNDMASS GRADES FROM A
       GLASS SELVAGE THROUGH A SPHERULITIC LAYER (1CM
       Texture: K) TO FINE BOW-TIE OR SHEAF-LIKE VARIOLES TO

ROCK = IAL PLAGIOCLASE CLUSTERS SET IN A MASS OF FINE
       FEATHERY PYROXENE VARIOLES AND ALTERED INTERSTITIAL
       GLASS*

Groundmass - PLAGIOCLASE

             PYROXENE

             GLASS
             ALTERED GLASS (MONT) PROBABLY IN PART PALAG PRIOR
             DIAGENESIS*

Alteration - PALAGONITE
             Replacing: GLASS

             MONTMORILLONITE
             Replacing: GLASS,OL

             IDDINGSITE
             Replacing: OL
             ESSENTIALLY NON-VESICULAR*




Leg : 17    Top/Bottom Interval(mm):  720/ 740  Describer: Bass, M.
Hole: 166   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   310.73   Sect/Pc #:  3/

ROCK = PLAG-PYX-OL MICROPHYRIC BASALT
       SOURCE IS IR,SEE P.481;
       Texture: CHILLED, MICROPHYRIC*

Phenocrysts- PLAGIOCLASE               (  8.4%)
             Size(mm):  0.25X0.03

             PYROXENE                  (  2.8%)
             Size(mm):  0.13X0.10

             OLIVINE                   (  2.3%)
             Size(mm):  0.19X0.12  Morphology: PSEUDOMORPHS

Groundmass - OPAQUE MINERALS           ( 11.6%)
             Size(mm):       0.35  Morphology: EQUANT,ELONGATE

             PYROXENE                  ( 74.8%)
             Morphology: FEATHERY VARIOLES
             MODAL ANALYSIS*

Alteration - MONTMORILLONITE
             Location: CORES          Replacing: PLAG,OL
             PLAG CORES,OL MICROPHENOS;

             IDDINGSITE
             Replacing: OL

Vesicles   -
             Percent:     0




Leg : 17    Top/Bottom Interval(mm):     /      Describer: Bass, M.
Hole: 166   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   311.60   Sect/Pc #: CC/

ROCK = COARSE-GRAINED BASALT OR FINE-GRAINED DIABASE
       SOURCE IS IR,SEE PP.481-482;
       Texture: APHYRIC,SUBVARIOLITIC GROUNDMASS,TEXTURALLY
       VARIABLE,WHERE RELATIVELY COARSE-GRAINED IS
       INTERGRANULAR OR RARELY SUBOPHITIC WHEREAS
       ELSEWHERE INTERGRANULAR TO INTERSERTAL VARIOLITIC
       MASS WITH ABUNDANT OPAQUE VEINS*

Groundmass - PLAGIOCLASE               ( 28.0%)
             Size(mm):   0.5X0.05

             PYROXENE                  ( 20.2%)
             Size(mm):  0.12X0.12

             OLIVINE                   (  2.7%)
             Size(mm):   0.5X0.12  Morphology: PSEUDOMORPHS

             OPAQUE MINERALS           ( 12.9%)
             Size(mm):   0.1X0.02

             GROUNDMASS                ( 36.2%)
             INCLUDES PYX+PLAG+OP.MINS IN AN ABUNDANT GREEN
             INTERSERTAL MASS OF INTERSERTAL MASS OF MONT,
             AT OTHER END ARE FEATHERY QUENCHED VARIOLES;

             AUGITE
             QUENCHED PYROXENE IS MAINLY SUBCALCIC AUGITE,
             MODAL ANALYSIS*

Alteration - MONTMORILLONITE
             Location: CORES          Replacing: PLAG

             CELADONITE
             Location: CORES          Replacing: PLAG

             MONTMORILLONITE
             Replacing: PYX

             MONTMORILLONITE
             Replacing: OL

             CELADONITE
             Replacing: OL

Vesicles   -
             Size(mm):     0.35
             Percent:    .1
             Filling: MONT




Leg : 17    Top/Bottom Interval(mm):    0/   0  Describer: Moberly, R.
Hole: 166   Top of Core Depth(m)   :   307.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   311.60   Sect/Pc #: CC/

ROCK = FINE DIABASE OR COARSE BASALT
       ALTERED,THIS SECTION CONSISTS OF THREE BANDS-GRAY,
       GREEN,BROWN*
             THE FOLLOWING IS A DESCRIPTION OF THE GRAY BAND:.
             THE GRAY BAND IS THE LEAST ALTERED AND HAS A
             DOLERITIC TEXTURE,IS FINE DIABASE IN GRAIN SIZE(TO
             1MM) AND NON-VESICULAR;

Groundmass - PLAGIOCLASE
             Size(mm):   TO 1X.04  Morphology: LATHS
             ALBITE AND PERICLINE TWINS,CORE COMMONLY
             SERICTIZED? OR SAUSSURITIZED;

             PYROXENE
             INTERSTITIAL;

             OPAQUE MINERALS
             Morphology: EQUANT-BLADED EUHEDRAL
             COMMONLY CLUSTERED;

             OLIVINE
             ABUNDANT SERPENTINE PSEUDOMORPHS OF OL,THE
             FOLLOWING IS A DESCRIPTION OF THE GREEN BAND:;

             BASALT
             GENERALLY SAME AS GRAY BAND BUT VESICLES RIMMED
             WITH VERY FINE GRAINED BASALT AND CHLORITIC
             GROUNDMASS MORE COMMON,THE FOLLOWING DESCRIPTION
             IS FOR THE BROWN BAND:;

             PLAGIOCLASE
             Size(mm):      TO .5
             FINE GRAINED,INTERSTITIAL PART BROWN,COMMONLY
             RADIATING LIKE LARGE VARIOLITES;

             OPAQUE MINERALS
             Size(mm):  TO .4X.03  Morphology: BLADES
             HEAVILY CHARGED WITH OPAQUES*

Alteration - CHLORITE
             Location: VESICLES+
             Location: GROUNDMASS

             MONTMORILLONITE
             Location: VESICLES
             THIS IS THE GREEN BAND*

Vesicles   -
             Size(mm):    TO .7
             Filling: CHLORITE+MONT
             Shape: IRREGULAR
             SOME RIMMED WITH BASALT*




    

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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