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Core data from the Ocean Drilling Program legs 101-129
leg : 109 section: 01 unit/subunit : 0027
hole: 0648B top int: 0 cm observer code: KUE
core: 007R pieces : n/a
rock name: CEMENT WITH BASALT FRAGMENTS
contact : see comments
***** MAIN COMMENTS *****
0-150 cms: cement with < 1% basalt fragments
***** PHENOCRYSTS *****
see comments
***** GROUNDMASS *****
see comments
***** COLOR *****
see comments
***** VESICLES *****
see comments
***** STRUCTURE *****
see comments
***** ALTERATION *****
see comments
***** VEINS/FRACTURES *****
see comments
leg : 109 section: 02 unit/subunit : 0028
hole: 0648B top int: 22 cm observer code: KUE
core: 007R pieces : 2 and 3
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: none observed, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 2-4 mm Euhedral, fresh
Olivine < 1 < 1 mm Round, fresh
Homogeneous distribution throughout unit, includes plagioclase-olivine
glomerocrysts.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Gray
***** VESICLES *****
percent: < 1
size: < 1 mm
shape: Round
distribution: n/a
miaroles: Some as miaroles
Empty, concentrated near edg.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh.
***** VEINS/FRACTURES *****
None
leg : 109 section: 01 unit/subunit : 0029
hole: 0648B top int: 0 cm observer code: KUE
core: 008R pieces : 1-14
rock name: SPARSELY PLAGIOCLASE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts. Note: Pieces 1, 3, 5, 7, 9, and 11 are drill
cuttings composed of: Basalt- Microcrystalline basalt with < 1% plagioclase
phenocrysts, some broken. Glass- exhibiting conchoidal fracturing with
fractures commonly filled by "sugary", microcrystalline, pale orange
mineral; some plagioclase phenocrysts embedded in glass. Cement- Irregular
and rounded fragments.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-6 mm Euhedral-subhedral, fresh
Olivine-rare Rare < 1 mm Rounded, fresh, associated with
plagioclase phenocrysts
Homogeneous distribution throughout unit.
***** GROUNDMASS *****
Fine grained (Pieces 2, 4 and 6) to fine to medium grained (Pieces 8, 10,
and 12-14), coarsening downward.
***** COLOR *****
Gray
***** VESICLES *****
miaroles: Pieces 2 and 6: some vesicles as miaroles; Pieces 8 and 13: < 1%, 1-5 mm,
elongate, concentrated near edge.
Pieces 2 and 6: 2%, 1-5 mm, round, some elongate, empty, homogeneous
distribution, some as miaroles. Pieces 4, 10, and 12-14: < 1%, < 1 mm,
mostly round, empty, homogeneous distribution.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh, Pieces 4 and 8: Alteration halo 4-5 mm wide composed of 2-3 mm-wide
pale band adjacent to vein and 2 mm wide outer black line with sharp
alteration front. Pieces 2, 6, 10, and 12-14: Dark alteration halo 2-4 mm
wide with sharp alteration front. Pieces 6 and 13: Black halos, irregular
thickness.
***** VEINS/FRACTURES *****
Alteration halos indicate position of fractures, no clay on fracture
surfaces. Piece 14: Small empty fracture in dark alteration halo.
leg : 109 section: 01 unit/subunit : 0030
hole: 0648B top int: 0 cm observer code: KUE
core: 009R pieces : 1-8
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: none, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 2-4 mm Euhedral, fresh
Olivine 1 < 1 mm Rounded, fresh
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts.
***** GROUNDMASS *****
Fine grained (Piece 1) to fine to medium grained (Piece 7), coarsening
downward.
***** COLOR *****
Gray
***** VESICLES *****
percent: < 1
size: < 0.5 mm
shape: Round, empty
distribution: Homogeneous distribution
miaroles: Piece 5 and 7: < 1%, < 1 mm, round to elongate, empty, homogeneous
distribution.
Pieces 1-3
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh.
***** VEINS/FRACTURES *****
Piece 2: Small empty fracture.
leg : 109 section: 01 unit/subunit : 0031
hole: 0648B top int: 61 cm observer code: KUE
core: 009R pieces : 9-11
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-4 mm Euhedral, fresh, occur singly and
in glomerocrysts.
Olivine < 1 < 1 mm Rounded, fresh, occur primarily in
glomerocrysts, rarely as isolated
phenocrysts.
Heterogeneous distribution; concentrated in isolated patches.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Gray
***** VESICLES *****
miaroles: Pieces 9-11: < 5% of vesicles as miaroles.
Pieces 9 and 10: 5%, 0.5-2.0 mm, round, most empty, some lined with
orange or bluish smectite, concentrated in local areas. Piece 11: 10%,
0.5-2.0 mm, round, most empty, some lined with orange clay or bluish
smectites, homogeneous distribution. Pieces 9-11: < 5% of vesicles as
miaroles.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Pieces 10 and 11: Dark alteration halo 2 mm wide parallel to
fracture surfaces bounding sample, smectite and orange clay confined to
vesicles within halos.
***** VEINS/FRACTURES *****
Bounding margins of samples, none within samples.
leg : 109 section: 01 unit/subunit : 0031
hole: 0648B top int: 0 cm observer code: KUE
core: 010R pieces : 10R-1, 1-3 through 12R-1, CC
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts. Piece 4: CEMENT. 109-648B-11R-1, 0-150 cm:
CEMENT. 109-648B-11R-2, 0-150 cm: CEMENT. 109-648B-11R-3, 0-150 cm: CEMENT.
109-648B-11R-CC, 0-30 cm: CEMENT. 109-648B-12R-1, 0-140 cm: CEMENT. 109-
648B-12R-2, 0-130 cm: CEMENT. 109-648B-12R-3, 0-148 cm: CEMENT. 109-648B-
12R-4, 0-19 cm: CEMENT. 109-648B-12R-cc, 0-40 cm: CEMENT.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 2-4 mm Euhedral, fresh
Olivine-rare n/a < 1 mm Round, fresh
Homogeneous distribution throughout unit; mostly as glomerocrysts but
also singly.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Gray
***** VESICLES *****
percent: 5
size: 0.5-2.5 mm
shape: Round, empty
distribution: Homogeneous distribution
miaroles: Piece 10R-1, 2: < 1%, 1-2 mm, irregular shapes, empty concentrated in band
through center. Piece 10R-1, 1 and 3: < 1%, 1-2 mm, irregular shapes,
empty, occur near or next to vesicles.
Piece 10R-1, 1: Orange clay in vesicle near rim.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Piece 10R-1, 1: Dark alteration halo 2 mm wide.
***** VEINS/FRACTURES *****
Piece 10R-1, 2: Empty crack.
leg : 109 section: 01 unit/subunit : 0032
hole: 0648B top int: 0 cm observer code: KUE
core: 013R pieces : 1-4
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: Pieces 1, 3, and 4: Possible glass-infilling vesicles. Piece 2:
None. Pieces 1-4: No contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase <1-3 0.5-3.0 mm Euhedral, fresh
Olivine < 1 < 0.5 mm Rounded, fresh
Heterogeneous distribution; concentrated in patches, especially in
Piece 3; occur singly and in glomerocrysts.
***** GROUNDMASS *****
Fine grained (Pieces 1, 3, and 4) to fine to medium grained (Piece 2).
***** COLOR *****
Gray
***** VESICLES *****
miaroles: < 1%, < 1 mm, irregular shape, bounded by crystal faces, patchy
distribution; approximately 50% of all voids are miaroles.
Pieces 1 and 3-4: < 1%, < 1 mm, round, empty or glass(?)-filled,
homogeneous distribution. Piece 2: Approximately 1%, < 1 mm, round,
empty, patchy distribution. Piece 3: Bluish smectite-lined vesicles in
dark alteration halo.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Pieces 1-2 and 4; Dark alteration halos approximately 2 mm wide
parallel to fracture surfaces bounding samples. Piece 3: Bisected by
alteration front, bluish smectite occurs as vesicle lining within the dark
zone.
***** VEINS/FRACTURES *****
Piece 1: Small crack.
leg : 109 section: 01 unit/subunit : 0033
hole: 0648B top int: 30 cm observer code: KUE
core: 013R pieces : 13R-1, 5 and 6 through 14R-1
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts. 109-648B-14R-1: 0-101 cm: Cement with
approximately 2% basalt fragments < 4 mm.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-4 mm Euhedral, fresh.
Olivine < 1 < 1 mm Rounded, fresh, rarely as isolated
phenocrysts, mainly in
glomerocrysts.
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Gray
***** VESICLES *****
percent: 5
size: 0.5-2.0 mm
shape: Round, most empty
distribution: Homogeneous distribution
miaroles: < 5% of all voids, < 0.5 mm, empty, patchy distribution
Lined by bluish smectite in dark halos.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Dark alteration halos 1-2 mm wide, developed parallel to fractures
bounding samples, lobate edge; bluish smectite-lined vesicles in halos.
***** VEINS/FRACTURES *****
n/a
leg : 109 section: 01 unit/subunit : 0034
hole: 0648B top int: 0 cm observer code: KUE
core: 015R pieces : 1-10
rock name: MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass; None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2-3 0.5-3.0 mm Euhedral, fresh
Olivine < 1 < 0.5 mm Subhedral, fresh
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts. Pieces 2, 5, and 9: Glomerocrysts as large as 6 mm.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Gray
***** VESICLES *****
miaroles: < 20% of all voids, < 0.5 mm, irregular shape, empty, patchy distribution.
Pieces 2 and 5: 2%, < 1.5 mm, round, empty away from alteration halos,
concentrated around edges and adjacent to plagioclase phenocryst in
Piece 5. Pieces 1, 3-4, and 6-10: < 1%, < 0.5 mm, round, empty,
homogeneous distribution.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Piece 2: Bluish smectite in one vesicle. Pieces 2, 6, and 10: Dark
alteration halos as wide as 8 mm, parallel to cracks. Piece 7: Yellow and
orange clay lining vesicles and replacing mesostasis, especially along
cracks; sharp boundary between altered and fresh parts of sample.
***** VEINS/FRACTURES *****
Pieces 2, 6, and 10: Fracture bounded, surfaces coated by thin layer
of light orange green clay.
leg : 109 section: 01 unit/subunit : 0035
hole: 0648B top int: 74 cm observer code: KUE
core: 015R pieces : 11-20
rock name: MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-3 0.5-3.0 mm Euhedral, fresh
Olivine <<0.5 < 0.5 mm Euhedral, fresh
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts as large as 6 mm.
***** GROUNDMASS *****
Microcrystalline to fine grained (Piece 11) to fine grained (Piece 12-20),
coarsening downward.
***** COLOR *****
Gray
***** VESICLES *****
miaroles: < 10% of all voids, < 0.5 mm, irregular and elongate shape, empty, patchy
distribution.
Pieces 11-15 and 19: 2-5%, < 2 mm, round, empty away from alteration
halos, homogeneous distribution. Pieces 16-18, 20, and 21: 5-10%, 0.5-
3.0 mm, round, often interconnected, empty away from alteration halos,
homogeneous distrbution.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Pieces 12-14 and 18-20: Dark alteration halo 2-5 mm wide parallel to
fractures bounding samples; boundaries lobate in places; yellow orange
clay/iron hydroxide mixtures along fractures, especially in Piece 14;
vesicles unusally free of alteration minerals; uneven lining of iron
hydroxide (?) and clay in a few vesicles directly adjoining fractures
***** VEINS/FRACTURES *****
Pieces 12-14: Fractures with orange yellow clay coating, often banded.
leg : 109 section: 01 unit/subunit : 0035
hole: 0648B top int: 0 cm observer code: KUE
core: 016R pieces : 1
rock name: MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-3 0.5-3.0 mm Euhedral, fresh.
Olivine <<0.5 < 0.5 mm Euhedral, fresh.
Homogeneous distribution; occur singly and in glomerocrysts as large
as 6 mm.
***** GROUNDMASS *****
Fine grained.
***** COLOR *****
Gray
***** VESICLES *****
percent: 10
size: 0.5-3.0 mm
shape: Round, often interconnected
distribution: Homogeneous distribution
miaroles: < 10% of all voids, < 0.5 mm, irregular and elongate shape, empty, patchy
distribution.
Empty away from alteration halos.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. dark alteration halo as wide as 11 mm along one side; intense
development green yellow orange iron hydroxide clay in almost all vesicles
with dark alteration halo.
***** VEINS/FRACTURES *****
Within and parallel to alteration halo, lined with iron hydroxide
clay.
leg : 109 section: 01 unit/subunit : 0036
hole: 0648B top int: 10 cm observer code: KUE
core: 016R pieces : 2-10
rock name: MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase ~3 0.5-0.4 mm Euhedral, fresh
Olivine < 0.5 < 0.5 mm Euhedral, fresh
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts as large as 5 mm.
***** GROUNDMASS *****
Patchy, fine grained to microcrystalline throughout unit, particularly in
Piece 9.
***** COLOR *****
Gray
***** VESICLES *****
percent: < 1
size: < 1 mm
shape: Round, empty
distribution: Randomly distributed
miaroles: < 30% of all voids, < 0.5 mm, irregular shape, empty, patchy distribution
Piece 3: Bright red iron hydroxide(?) lining part of vesicles in
alteration halo.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Pieces 3-6 and 9: Dark alteration halos parallel to fractures
bounding samples, yellow green clay on surface(?). Piece 3: Bright red iron
hydroxide(?) lining part of vesicles in halo zone.
***** VEINS/FRACTURES *****
Fractured surfaces bounding pieces with dark alteration halos.
leg : 109 section: 01 unit/subunit : 0037
hole: 0648B top int: 5 cm observer code: KUE
core: 017R pieces : 2
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-3 mm Euhedral, fresh
Olivine < 1 0.5 mm Round, fresh
Homogeneous distribution; occur singly and in glomerocrysts.
***** GROUNDMASS *****
Fine grained.
***** COLOR *****
Gray
***** VESICLES *****
percent: < 1
size: < 1 mm
shape: Irregular shapes
distribution: Irregular distribution
miaroles: < 10% of all voids, < 0.5 mm, irregualr shape, empty, concentratedin
horizontal bands.
Empty or coated with orange clay, concentrated near one edge.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh, patchy orange clay coating on exterior of sample , filling some
vesicles.
***** VEINS/FRACTURES *****
None
leg : 109 section: 01 unit/subunit : 0038
hole: 0648B top int: 10 cm observer code: KUE
core: 017R pieces : 3-7
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: Pieces 3 and 7: Glassy margins as thick as 3 mm, fresh, no contacts.
Miaroles: In Piece 5 are approximately 75% of all voids, 0.5-3.0 mm,
irregular shape , empty, and with homogeneous distribution.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2 0.5-0.4 mm Subhedral to euhedral, fresh
Olivine < 1 0.5-1.0 mm Subhedral to euhedral, fresh
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts.
***** GROUNDMASS *****
Microcrystalline (Pieces 3 and 7) to fine grained (Piece 5), coarsening
toward center.
***** COLOR *****
Gray, glass is black.
***** VESICLES *****
miaroles: In Pieces 3,4,6, and 7are < 10% of all voids, 0.5-2.0 mm, irregular shapes,
empty, and concentrated in bands
Pieces 3-5 and 7: < 1%, < 0.5 mm, irregular shapes, empty in interior
of unit, can be filled near glass margins, irregular distribution.
Pieces 3 and 7: Concentrated near glassy margins, can be partially to
completely filled by glass near glassy margins, yellow orange clay
lines some vesicles. Piece 6: 1-3%, 1-2 mm, irregular shapes, empty,
irregular distribution.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh. Piece 3: Olive green clay coating on portions of glassy margin,
yellow orange clay lining in some vesicles.
***** VEINS/FRACTURES *****
None.
leg : 109 section: 01 unit/subunit : 0039
hole: 0648B top int: 34 cm observer code: KUE
core: 017R pieces : 8
rock name: SPARSELY TO MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2 0.5-3.0 mm Euhedral to subhedral, fresh
Olivine < 1 < 0.5 mm Round to subhedral, fresh
Homogeneous distribution; occur singly and in glomerocrysts.
***** GROUNDMASS *****
Microcrystalline to fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
percent: 8
size: 0.5-5.0 mm
shape: Most round,some irregularly shaped,empty
distribution: Homogeneous distribution
miaroles: 15% of all voids. < 1.0 mm, irregular shapes, empty, homogeneous
distribution.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh, dark alteration halo 2-3 mm wide along one side of piece, side
coated by yellow orange clay.
***** VEINS/FRACTURES *****
None
leg : 109 section: 01 unit/subunit : 0040
hole: 0648B top int: 0 cm observer code: KUE
core: 018R pieces : 1-2
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: none, no contacts. Alteration continued: Pieces 1B and 2: 3-4 mm-
thick dark alteration halos (homogeneous dark green color) on bottom of
Piece 1A and top of Piece 2.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-5 mm Euhedral-subhedral, fresh
Olivine < 1 as large as 0.5 ,as large as 1.0 mm (Piece 2),
mm (Pieces 1A round, fresh, associated with
nad 1B) plagioclase in glomerocrysts also
singly.
Heterogeneous distribution. Pieces 1A and 1B: Concentrated in patches.
Piece 2: Concentrated near top and bottom.
***** GROUNDMASS *****
Uniformly fine grained, with patchy microcrystalline regions in Piece 2.
***** COLOR *****
Gray
***** VESICLES *****
percent: Rare
size: < 1 mm
shape: Round, empty
distribution: n/a
miaroles: 75% of all voids, < 0.5 mm, irregular shape, long, bounded by crystal
faces, empty, homogeneous distribution.
Rare, concentrated in Pieces 1A and 1B.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh, all pieces have alteration halos parallel to fractured surfaces,
yellow green (locally orange) clay/iron hydroxides coat fractures. Piece
1A: Layered alteration halo 9 mm wide at top of sample, 2 mm-wide dark
green band farthest from fracture (same type as in Pieces 1B and 2), 7 mm-
wide band adjacent to fracture, speckled yellow orange appearance, intense
clay/iron hydroxide alteration.See comments.
***** VEINS/FRACTURES *****
Fractures with alteration halos, as above.
leg : 109 section: 01 unit/subunit : 0040
hole: 0648B top int: 0 cm observer code: KUE
core: 019R pieces : 1-2
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-4 mm Euhedral-subhedral, fresh. Occcur
singly and in glomerocrysts.
Olivine < 1 0.5-2.0 mm Rounded, fresh. Occur primarily in
glomerocrysts with plagioclase.
Heterogeneous distribution. Pieces 1A and 1B: Concentrated near sides,
few phenocrysts. Pieces 2A and 2B: Concentrated near centers.
***** GROUNDMASS *****
Fine grained with patchy microcrystalline regions.
***** COLOR *****
Gray
***** VESICLES *****
percent: <<1
size: < 1 mm
shape: Round, empty
distribution: Homogeneous distribution
miaroles: None
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh.
***** VEINS/FRACTURES *****
Series of horizontal fractures with spacing of 2-3 cm on cut surface
of core; fracture surfaces are fresh, no alteration.
leg : 109 section: 01 unit/subunit : 0041
hole: 0648B top int: 0 cm observer code: KUE
core: 020R pieces : 1, 3 and 5
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-4 mm Euhedral, fresh
Olivine < 1 < 1 mm Rounded, fresh, mainly as
glomerocrysts
Homogeneous distribution; occur singly and in glomerocrysts.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Gray
***** VESICLES *****
miaroles: < 10% of all voids, < 0.5 mm, round, look like vesicles with crystals
projecting toward interior, empty, homogeneous distribution.
Piece 1: 2-3%, 0.2-2.0 mm, r und, empty or lined by bluish smectite in
alteration halos, concentrated in bands. Pieces 3 and 5: 7%, 0.5-2.5
mm, round, empty or lined by bluish smectite in alteration in halos,
concentrated around edges.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh, dark alteration halos 1-2 mm wide developed parallel to edges,
bluish smectite-lined vesicles within halos.
***** VEINS/FRACTURES *****
Piece 5: Contains fresh crack on edge.
leg : 109 section: 01 unit/subunit : 0041
hole: 0648B top int: 9 cm observer code: KUE
core: 020R pieces : 2, 4, and 6
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
Glass: Piece 4: Small amount of glass on edge, fresh, no contacts. Pieces 2
and 6: None, no contacts.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 1-3 mm Euhedral, fresh
Olivine < 1 < 0.5 mm Euhedral, fresh
Homogeneous distribution throughout unit; occur singly and in
glomerocrysts.
***** GROUNDMASS *****
Pieces 2 and 6: Uniformly fine grained. Piece 4: Glassy to
microcrystalline.
***** COLOR *****
Gray, glass is black.
***** VESICLES *****
percent: 1
size: < 1 mm
shape: Round to irregular, empty
distribution: Homogeneous distribution
miaroles: 25% of all voids, < 0.5 mm, irregular, empty, homogeneous distribution.
***** STRUCTURE *****
n/a
***** ALTERATION *****
Fresh, Piece 2: Dark alteration halo 1-2 mm wide on part of margin. Pieces
4 and 6: Green coating on outer surfaces.
***** VEINS/FRACTURES *****
Piece 6: Fracture through part of sample.
introduction | data types | geographic areas | legs/sites/holes | sites/holes
These Web pages are from the Core Data from the Ocean Drilling Program Legs 101-129 CD-ROM produced in 2001 by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center, and collocated World Data Center for Marine Geology and Geophysics, Boulder. Data were compiled in cooperation with the U.S. Science Support Program, the Joint Oceanographic Institutions, Inc., and the U.S. National Science Foundation. Please see the NGDC privacy, disclaimer, and copyright notices. Additional ocean drilling data are available from NGDC and from the ODP/IODP.
questions to: carla.j.moore@noaa.gov