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*
|
