Leg : 14 Top/Bottom Interval(mm): 600/ 700 Describer: Benson, W.E.
Hole: 138 Top of Core Depth(m) : 425.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 427.15 Sect/Pc #: 2/PCE 3
ROCK = BASALT
ALTERED THOLEITIC BASALT;
Texture: INTERGRANULAR, DOLERITIC
NOW LATHS + BLOCKY FELDSPAR SURROUNDING FORMER
PYX XTLS;
Groundmass - FELDSPAR
Size(mm): .1-.5
NEARLY ALL AT LEAST PARTLY ALTERED,ORIGINAL COMP
PROBABLY LABRADORITE (AN55), LATHS, SOME XTLS
COMPLETELY ALTERED;
PYROXENE
COMPLETELY ALTERED TO CHLORITE (SERP?) + BIOTITE
+ HBL, THESE ALL OCCUR AS PYX REPLACEMENTS AND
AS SECONDARIES NOT IN POSITION OF ORIGINAL PYX,
EUHEDRAL TO SUBHEDRAL BIOTITE COMMON PARTLY
SURROUNDING THE OPAQUE IRON OXIDES;
FERROUS OXIDE
INCLUDES ILMENITE+HEMATITE+MAGNETITE AS
RECTILINEAR GRAINS + "DUST" IN CHLORITIC
PYX REPLACEMENTS;
GLASS (10-15%)
ALTERED*
Alteration - CALCITE
Replacing: PLAG
MINOR;
SAUSSURITE
Replacing: PLAG
SERICITE
Replacing: PLAG
KAOLINITE
Replacing: PLAG
CLINOZOISITE
Replacing: PLAG
EPIDOTE
Replacing: PLAG
ID UNCERTAIN;
ALBITE
LATHS AND OVERGROWTHS;
CHLORITE
Replacing: PYX
SERPENTINITE
Replacing: PYX
ID UNCERTAIN;
BIOTITE
Replacing: PYX
HORNBLENDE
Replacing: PYX
Leg : 14 Top/Bottom Interval(mm): 0/ 0 Describer: Benson, W.E.
Hole: 138 Top of Core Depth(m) : 437.00 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 437.00 Sect/Pc #: 1/
ROCK = BASALT
SOURCE IS IR*
Groundmass - OLIVINE ( 1.2%)
CHLORITE PSEUDOMORPHS AFTER OL AND PYX;
PLAGIOCLASE ( 18.2%)
OPAQUE MINERALS ( 4.6%)
BIOTITE ( 12.2%)
ALTERED GLASS ( 36.0%)
MAINLY SMECTITE,PERCENTAGES OBTAINED BY MODAL
ANALYSES*
Alteration - CHLORITE ( 7.4%)
Replacing: OL,PYX
EPIDOTE ( 1.4%)
APATITE ( 0.4%)
CALCITE ( 0.2%)
ZEOLITE ( 18.4%)
Replacing: PLAG
COLORLESS SHEAVES-PROBABLY ALTERED PLAG LATHS,
IDENTIFIED AS NATROLITE ON WHOLE ROCK X-RAY
PATTERN*
Leg : 14 Top/Bottom Interval(mm): 580/ 0 Describer: Benson, W.E.
Hole: 138 Top of Core Depth(m) : 437.00 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 437.58 Sect/Pc #: 1/PCE 1
ROCK = BASALT
FROM TWO THIN SECTIONS;
Texture: COARSE, INTERGRANULAR,DOLERITIC
ALTERED GLASS MARGIN;
Groundmass - GLASS ( 5-10%)
ALTERED;
FELDSPAR ( 50%)
Size(mm): .1-.5
FRESH TO SLIGHTLY ALTERED LABRADORITE, APPROX
COMP AN55,HALF BADLY TO COMPLETELY ALTERED,MANY
LONG LATHS HAVE LONG NEEDLES OF CLINOZOISITE
+ SOME EPIDOTE + ALBITE,SOME LATE SPAR (WAVY)
MAY BE ORTHOCLASE;
PYROXENE
ALL ALTERED EXCEPT A FEW RELICT GRAINS TO
CHLORITE + ANTIGORITE (+CHRYSOTILE?),BIOTITE+HBL,
THESE FE-MG ALTERATIONS ALSO OCCUR IN
POSITIONS OTHER THAN THOSE OF ORIGINAL PYX;
FERROUS OXIDE (TO 10%)
ORTHOCLASE
Alteration - SAUSSURITE
Replacing: PLAG
SERICITE
Replacing: PLAG
MINOR;
CALCITE
Replacing: PLAG
CLINOZOISITE
Replacing: PLAG
EPIDOTE
Replacing: PLAG
ALBITE
Replacing: PLAG
CHLORITE
Replacing: PYX
ANTIGORITE
Replacing: PYX
CHRYSOTILE
Replacing: PYX
ID UNCERTAIN;
BIOTITE
Replacing: PYX
HORNBLENDE
Replacing: PYX
NATROLITE
IN SEVERAL FIBROUS MASSES;
STILBITE
ID UNCERTAIN;
CALCITE ( <5%)
Leg : 14 Top/Bottom Interval(mm): 1070/ 0 Describer: Benson, W.E.
Hole: 138 Top of Core Depth(m) : 437.00 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 438.07 Sect/Pc #: 1/PCE 9
ROCK = BASALT;
Texture: SIMILAR TO TOP BUT FINER-GRAINED AND MORE
ALTERED;
Groundmass - FELDSPAR ( >50%)
ALTERED;
PYROXENE
NEARLY ALL GONE*
Alteration - ALBITE
Replacing: PLAG
LATE FIBROUS;
ZEOLITE
NATROLITE
STILBITE
ID UNCERTAIN;
CALCITE (20-25%)
Location: IRREG MASSES Replacing: FELDSPAR,PYX
BIOTITE
LATH-LIKE BUT MINOR COMPARED TO BIOTITE &
CHLORITE*
Leg : 14 Top/Bottom Interval(mm): 0/ 0 Describer: Benson, W.E.
Hole: 138 Top of Core Depth(m) : 437.00 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 438.60 Sect/Pc #: CC/
ROCK = BASALT
LESS ALTERED THAN PCES 1&9,THOLEITIC BASALT,
PARTLY ALTERED;
Texture: INTERGRANULAR,COARSE GRAINED;
Where sampled: BOTTOM OF CORE (DRILL BIT)*
Groundmass - FELDSPAR
ORIGINAL LABRADORITE,EXTENSIVELY ALTERED (BUT
LESS SO THAN PCES 1&9) TO SAUSSURITE +
SERICITE,ALTERATION PARALLEL TO LATHS IN CLZOIS +
ALBITE(SOME EPIDOTE?),LATE FELDSPAR ALTERATION
IN ORTHOCLASE AND ALBITE;
OLIVINE
MINOR,SOME COMPARATIVELY UNALTERED;
PYROXENE
Morphology: EUHEDRAL
FEW BUT UNALTERED,APPEAR TO BE DIOPSIDIC AUGITE
(GREEN) AUGITE;
FERROUS OXIDE ( >5%)
ORTHOCLASE
LATE FELDSPAR(ALTERATION) IS OR + ALBITE*
Alteration - SAUSSURITE
Replacing: PLAG
SERICITE
Replacing: PLAG
CLINOZOISITE
Replacing: PLAG
ALBITE
Replacing: PLAG
EPIDOTE
Replacing: PLAG
ID UNCERTAIN;
BIOTITE
Replacing: PYX
SERPENTINITE
Replacing: PYX
CHLORITE
Replacing: PYX
HORNBLENDE
Replacing: PYX
MINOR;
NATROLITE
FIBROUS;
STILBITE
Replacing: FELDSPAR
GREY FIBROUS SECONDARY,PROBABLY MOSTLY ZEOLITE
(STILBITE) BUT SOME MAY BE FELD;
CALCITE
MINOR*
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