Leg : 29 Top/Bottom Interval(mm): 170/ 220 Describer: Ridley, W.
Hole: 278 Top of Core Depth(m) : 429.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 429.20 Sect/Pc #: 1/
ROCK = GLASS
PALE BROWN,HOMOGENEOUS,SOURCE IS IR;
Where sampled: CHILLED PILLOW MARGIN*
Phenocrysts- PLAGIOCLASE
Size(mm): TO 2
PATCHILY ZONED;
OLIVINE
Morphology: EUHEDRAL
SMALL;
SPINEL
REDDISH CHROME-SPINEL*
GLASSY ZONE GRADES INTO A DARK BROWN,NARROW ZONE
OF SPHERULITIC DEVELOPMENT WHICH IN TURN GRADES
INTO DARK BROWN MICROXTLLINE BASALT CONTAINING
A COMBINATION OF XTLLINE AND SPHERULITIC REGIONS,
ALL ZONES ARE CUT BY THICK CALCITE VEINS RIMMED
BY DELICATE QUARTZ XTLS,THESE ARE IN TURN CUT BY
THIN,IRREGULAR VEINS OF PALE YELLOW
MONTMORILLONITE*
Alteration - CALCITE
Location: VEINS,
Location: VESICLES
MONTMORILLONITE
Location: VEINS
Vesicles -
Filling: EMPTY+CALCITE
Shape: ROUNDED
A FEW VESICLES EITHER EMPTY OR CALCITE-FILLED*
Leg : 29 Top/Bottom Interval(mm): 250/ 350 Describer: Ridley, W.
Hole: 278 Top of Core Depth(m) : 429.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 432.30 Sect/Pc #: 3/
ROCK = PLAG PHYRIC BASALT
SOURCE IS IR FOR ALL LEG 29 THIN SECTIONS;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 21%)
Size(mm): TO 3
LARGE PHENOS ZONED FROM MOTTLED CORES OF AN64 COMP
TO AN30 RIMS,MOST PHENO COMPS ARE IN RANGE AN50-
55,OFTEN OCCUR IN GLOMEROPHYRIC PATCHES UP TO 5MM
IN SIZE,MANY CONTAIN IRREGULAR-SHAPED INCLUSIONS
OF DEVITRIFIED DARK BROWN GLASS*
Groundmass - PLAGIOCLASE
Morphology: LATHS
FRESH,APPROX COMP AN45;
PYROXENE
Morphology: FIBROUS-SKELETAL
INTERSTITIAL,ALTERED,AVERAGE GROUNDMASS GRAINSIZE
IS .075-.1MM*
Vesicles -
Filling: CALCITE
Shape: ROUNDED
RARE,USUALLY ROUNDED AND RIMMED BY DEVITRIFIED
DARK BROWN GLASS+FIBROUS ANTIGORITE AND FILLED
WITH PLATY CALCITE,IRREGULAR VESICLES ARE PARTLY
TO WHOLLY FILLED WITH YELLOWISH SERPENTINE*
Leg : 29 Top/Bottom Interval(mm): 0/ 0 Describer: Ridley, W.
Hole: 278 Top of Core Depth(m) : 429.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 433.60 Sect/Pc #: CC/
ROCK = PLAG PHYRIC BASALT;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 16%)
Size(mm): 2
LARGEST PHENOS ARE APPROX 5MM,THE AVERAGE APPROX
2MM,PHENOS FREQUENTLY ENCLOSE IRREGULAR PATCHES OF
BROWN GLASS,MAXIMUM ZONING IN PHENOS IS AN63 TO
THIN RIMS OF AN41,OCCURS IN GLOMEROPHYRIC PATCHES
WITH PHENOS OF SUBHEDRAL,COLORLESS CPX,ALSO
PRESENT ARE RARE MICROPHENOS OF SUBHEDRAL,REDDISH-
BROWN SPINEL*
Groundmass - PLAGIOCLASE
ZONED FROM AN50 TO AN44;
GLASS
MESOSTASIS GLASS IS DARK BROWN,PARTLY REXTLLIZED
AND ALTERED*
Vesicles -
Filling: MESOSTAS GLASS
RARE,FILLED WITH BROWN,QUENCHED MESOSTASIS GLASS
XTLLIZED TO SUBSPHERULITIC INTERGROWTHS OF PYX
AND TITANOMAGNETITE*
|
