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Core data from the Ocean Drilling Program legs 101-129
leg : 109 section: 01 unit/subunit : 0001
hole: 0670A top int: 0 cm observer code: KUE
core: 001D pieces : 1, 2, and 4
rock name: PIECE 1: DRILL CUTTINGS(SERPENTINIZED HARZBURGITE). PIECES 2
AND 4: SERPENTINIZED HARZBURGITE.
color : n/a
layering : Massive, non-layered.
deformation: None apparent in sample.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 89%
size: 0.01-1.0 mm
shape: Polygonal
orientation: Not apparent
replacement: See description
description: Replacement: 100% with serpentine, magnetite, and carbonate.
primary mineral no.2
mineral name: Orthopyroxene
percent: 10%
size: 1.0-5.0 mm
shape: Elliptical to lensoid.
orientation: Not apparent
replacement: 60% with serpentinite + talc.
primary mineral no.3
mineral name: Spinel
percent: 1%
size: < 1 mm
shape: lensoid
orientation: Not apparent
replacement: None apparent
***** SECONDARY PHASES *****
percent: 95%
texture: Pseudomorphic replacement of orthopyroxene with serpentine
(bastite)-rimmed talc. Mesh texture serpentine + magnetite +
minor carbonate replacing olivine.
veins: 5% of sample, veins < 0.5 mm thick. Chrysotile fibers oriented
perpendicular to vein lengths, carbonate in veins is massive.
common magnetite-filled veins.
leg : 109 section: 01 unit/subunit : 0001
hole: 0670A top int: 0 cm observer code: KUE
core: 002D pieces : 1-13
rock name: PIECES 1-6 AND 8-12: SERPENTINIZED HARZBURGITE
color : Green
layering : No primary layering
deformation: Well-defined foliation planes defined by preferred
orientation of orthopyroxene porphyroclasts set in
serpentinized olivine matrix; orthopyroxene is lens-shaped.
***** MAIN COMMENTS *****
Piece 13: drill cuttings (serpentinized harzburgite).
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 89%
size: < 1 mm
shape: Polygonal
orientation: Not apparent
replacement: 100% with serpentine and magnetite.
primary mineral no.2
mineral name: Orthopyroxene
percent: 10%
size: 1-5 mm
shape: Lens, elongate
orientation: Yes, along foliation planes.
replacement: 60% with serpentine and talc.
primary mineral no.3
mineral name: Spinel
percent: 1%
size: 0.5 mm
shape: See description
orientation: Noted below
replacement: Approximately 1% with magnetite
description: Shape: Lens-like, blocky;fragments elongate parallel to the
foliation plane.
***** SECONDARY PHASES *****
percent: 95%
texture: Pseudomorphic replacement of orthopyroxene with serpentine and
rim of talc, mesh texture replacement of olivine with serpentine,
magnetite, and carbonate.
veins: 1%, < 1 mm thick. Carbonate, magnetite, and serpentine;
serpentine is fibrous; carbonate and magnetite are massive.
leg : 109 section: 01 unit/subunit : 0001
hole: 0670A top int: 10 cm observer code: KUE
core: 003W pieces : 2 and 3
rock name: PIECE 2: SERPENTINIZED HARZBURGITE. PIECE 3: ASSORTED
RUBBLE.
color : Green gray
layering : No primary layering.
deformation: None apparent.
***** MAIN COMMENTS *****
Piece 3 comprises: Serpentinized harzburgite- 5 pieces, same as piece 2.
Sparsely plagioclase-olivine phyric basalt- 1 piece of rubble, similar to
Piece 1. Aphyric basalt- One 13 x 7 mm piece of hydrothermally-altered
aphyric basalt containing quartz and zeolite veins, groundmass strongly and
pervasively altered to chlorite (?).
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 90
size: < 1 mm
shape: Polygonal
orientation: Not apparent
replacement: 100% with serpentine + magnetite.
primary mineral no.2
mineral name: Orthopyroxene
percent: 7-10
size: 1-4 mm
shape: Round to elliptical.
orientation: Not apparent.
replacement: 60% with serpentine + talc.
primary mineral no.3
mineral name: Spinel
percent: ~1
size: n/a
shape: Lens-like, blocky fragments, elongate.
orientation: Not apparent.
replacement: Approximately 1% by magnetite.
***** SECONDARY PHASES *****
percent: 95%
texture: Pseudomorphic replacement of orthopyroxene with serpentine and
rim of talc; mesh texture replacement of olivine with serpentine,
magnetite, and carbonate.
veins: 1-2%, < 1 mm thick. Carbonate, magnetite, serpentine (chrysotile)
, chlorite(?), undetermined texture filling.
leg : 109 section: 01 unit/subunit : 0001
hole: 0670A top int: 0 cm observer code: KUE
core: 004W pieces : 1-4
rock name: SERPENTINIZED HARZBURGITE
color : Dark to light green.
layering : No apparent primary layering.
deformation: Foliation defined by elliptical orthopyroxene
porphyroclasts, inclination of foliation indeterminate.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 84-94
size: < 1 mm
shape: Polygonal
orientation: Not apparent
replacement: 100% with serpentine,talc, and carbonate
primary mineral no.2
mineral name: Orthopyroxene
percent: 5-15
size: 0.3-1.2 mm
shape: Round to elliptical
orientation: See description
replacement: 60% with serpentine and talc.
description: Orientation: Long axes of elliptical orthopyroxene are aligned.
primary mineral no.3
mineral name: Spinel
percent: 1
size: 0.1-0.5 mm
shape: Blocky, elongate
orientation: See description
replacement: < 5% with magnetite
description: Orientation: Grains are elongated in same orientation as
elliptical orthopyroxene.
***** SECONDARY PHASES *****
percent: 87-93
texture: Serpentine mesh texture after olivine, basite pseudomorphing
orthopyroxene, talc + serpentine halos around orthopyroxene.
veins: 1-2%, average < 1 mm thick with one vein 1-2 mm thick.
phase two comments:
Veins filled by one or more of carbonate, magnetite, and serpentine; thick
vein in Piece 4B is deformed in same sense as defined by orthopyroxene
grains.
leg : 109 section: 01 unit/subunit : 0002
hole: 0670A top int: 14 cm observer code: KUE
core: 005R pieces : 3-17
rock name: SERPENTINIZED PERIDOTITE
color : Black to green
layering : No primary layering apparent.
deformation: Foliation defined by elongate orthopyroxene, foliation
inclined at approximately 20 degree from horizontal.
***** MAIN COMMENTS *****
109-670A-5R-1, Unit 1: serpentinized harzburgite. Pieces 1 and 2: Similar
to other samples from Unit 1.
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 95
size: Indeterminate in hand seciman.
shape: Indeterminate in hand specimen.
orientation: Not apparent.
replacement: See description
description: Description: 100% with serpentine + talc + carbonate.
primary mineral no.2
mineral name: Orthopyroxene
percent: 0-4
size: 0.8-1.6 mm
shape: Elongate to elliptical.
orientation: Defined by long axes of elongate opx
replacement: See description
description: Description: 0-100% with serpentine +talc.
primary mineral no.3
mineral name: Spinel
percent: n/a
size: n/a
shape: n/a
orientation: n/a
replacement: n/a
description: Not apparent (see 109-670A-5R-02).
***** SECONDARY PHASES *****
percent: ?
texture: Distinctive "tortoise-shell" texture developed throughout unit,
polygonal domains in texture are defined by crosscutting black
hands, possibly serpentine filled; within polygonal domains,
concentric elliptical rings are defined by alternating bands of
light to dark green minerals.
veins: 1-10%, 1-4 mm thick.
phase two comments:
Total percent secondary minerals: 96-100%. Dark bands defining polygonal
domains 1-4 mm thick, centers of dark bands contain white to light green
mineral, Piece 16 has a greater concentration of bands filled with light
green mineral.
leg : 109 section: 02 unit/subunit : 0002
hole: 0670A top int: 0 cm observer code: KUE
core: 005R pieces : 1-7
rock name: PIECES 1-3 AND 5-7:SERPENTINIZED PERIDOTITE. PIECE 4:
SERPENTINIZED PERIDOTITE,BUT PIECE 4 WITH THE FOLLOWING
DIFFERENCES
color : n/a
layering : n/a
deformation: n/a
***** MAIN COMMENTS *****
Pieces 1-7 as in 109-670A-5R-01.
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Spinel
percent: < 1
size: Approximately 1 mm long
shape: Blocky to elonagte.
orientation: May be defined by spinel layer.
replacement: Not apparent.
***** SECONDARY PHASES *****
phase two comments:
n/a
leg : 109 section: 02 unit/subunit : 0003
hole: 0670A top int: 62 cm observer code: KUE
core: 005R pieces : 8-19
rock name: HARZBURGITE
color : Green
layering : No primary layering apparent.
deformation: Foliation defined by elongate orthopyroxene grains,
foliation ap ears to be near horizontal.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 82-95
size: < 2 mm
shape: Polygonal
orientation: Not apparent in hand specimen.
replacement: Approximately 90%.
primary mineral no.2
mineral name: Orthopyroxene
percent: 5-15
size: 0.5-1.6 cm.
shape: Round to elongate.
orientation: See description
replacement: 0-10% with serpentine + magnetite +talc.
description: Orientation: Defined by elongate orthopyroxene where present.
primary mineral no.3
mineral name: Clinopyroxene
percent: 0-2
size: 3 mm
shape: Rounded
orientation: Not apparent.
replacement: See description
description: Replacement: 0-10% with pale green alteration assemblage.
primary mineral no.4
mineral name: Spinel
percent: 0-1
size: 0.7-1.0 mm.
shape: Blocky to elongate.
orientation: May be defined by elongate spinel.
replacement: < 5% with magnetite.
***** SECONDARY PHASES *****
percent: 90%
texture: Mesh texture serpentine replacing olivine, fibrous bastite
replacing orthopyroxene, magnetite rimming spinel, also dark
halos around orthopyroxene.
veins: < 1%, 1-2 mm thick.
phase two comments:
Veins filled by massive magnetite + serpentine; also white veins filled by
fibrous material, possibly chrysotile.
leg : 109 section: 01 unit/subunit : 0003
hole: 0670A top int: 0 cm observer code: KUE
core: 006R pieces : 1-10
rock name: HARZBURGITE
color : Green
layering : Not apparent in hand specimen.
deformation: Weak foliation defined by long axes of slightly elongate
orthopyroxene grains, inclination approximately 20 degree
from horizontal.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 80-95
size: < 0.2 mm
shape: Round
orientation: Not apparent.
replacement: See description
description: Replacement: Approximately 90% with serpentine + magnetite +
talc.
primary mineral no.2
mineral name: Orthopyroxene
percent: 5-15
size: Most are 0.6-0.8 cm, ange is 0.1-3.6 cm.
shape: See description
orientation: See description
replacement: Approximately 10% by bastite
description: Shape: Most round to slightly elongate, some very elongate.
Orientation: Weak foliation defined by long axes of elongate
grains.
primary mineral no.3
mineral name: Clinopyroxene
percent: 1-4
size: 0.1-0.4 mm
shape: Round
orientation: Not apparent.
replacement: Indeterminate in hand specimen.
primary mineral no.4
mineral name: Spinel
percent: 1-2
size: 0.1-0.3 mm.
shape: Round to elongate, often blocky.
orientation: See description
replacement: 1-5% with magnetite.
description: Orientation: Weakly aligned with elongate orthopyroxene.
***** SECONDARY PHASES *****
percent: 60%
texture: Olivine replaced by serpentine, magnetite, and talc in mesh
texture; orthopyroxene partially pseudomorphed by bastite; spinel
rimmed by magnetite.
veins: < 1%, 1-2 mm thick.
phase two comments:
Veins are black, possibly magnetite filled.
leg : 109 section: 01 unit/subunit : 0003
hole: 0670A top int: 0 cm observer code: KUE
core: 007R pieces : 1-5
rock name: HARZBURGITE
color : Green
layering : Piece 1 contains layering defined by concentration of
orthopyroxene.Thickness: Indeterminate. Azimuth and dip:
Indeterminate. Modal layering: Defined by alternating
orthopyroxene-rich and olivine-rich layers. Sequence and
abundance: Indeterminate. Contact: Sharp.
deformation: Foliation defined by long axes of tabular orthopyroxene
grains. Piece 1: Foliation defined by disaggregated and
drawn out spinel, and by elongated serpentine halos which
extend from orthopyroxene.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 85-95
size: < 0.2 mm
shape: Round
orientation: Not apparent.
replacement: See description
description: Replacement: Approximately 70% with talc + serpentine +
magnetite.
primary mineral no.2
mineral name: Orthopyroxene
percent: 3-10
size: As large as 8 mm.
shape: Round to elliptical.
orientation: See description
replacement: 0-10% with talc, serpentine.
description: Orientation: Defined by long axes of elliptical orthopyroxene
grains, weak.
primary mineral no.3
mineral name: Clinopyroxene
percent: 1-4
size: As large as 4 mm.
shape: Round.
orientation: Not apparent.
replacement: 0%, looks fresh.
primary mineral no.4
mineral name: Spinel
percent: 1
size: 1-2 mm
shape: Blocky to elliptical
orientation: See description
replacement: < 5% with magnetite.
description: Orientation: Defined by long axes of some elliptical spinel
grains.
***** SECONDARY PHASES *****
percent: 70
texture: Olivine replaced by serpentine, magnetite, and talc in a mesh
texture; orthopyroxene pseudomorphed by bastite and rimmed by
talc; spinel rimmed by magnetite.
veins: < 1%, < 1 mm thick.
phase two comments:
Most veins are black, possibly magnetite filled; some veins filled by white
material, possibly chrysotile.
leg : 109 section: 01 unit/subunit : 0004
hole: 0670A top int: 29 cm observer code: KUE
core: 007R pieces : 6-13
rock name: SERPENTINITE
color : Black and white mottled.
layering : Not apparent.
deformation: Possible shear zones between Pieces 7A and 7C and between
13B and 13D; parts of Piece 6 were embedded in sheared
matrix material. Material was removed and replaced with
Pieces 7B, 13C, and 6B, respectively. Piece 6: Serpentine-
rich material consisting of massive light green fibers
surrounding pieces. Pieces 7A and 7C: Separated by a massive
serpentine vein approximately 1.5 cm thick consisting of
light green serpentine needles > 1 cm in length; both pieces
contain talc + serpentine-rich layer on one side which
defines the boundary of the shear zone.
***** MAIN COMMENTS *****
Piece 13: Massive serpentine-rich zones between Pieces 13A, 13B, and 13D,
similar to those found between 7A and 7C. No apparent foliation defined by
elongate minerals. Note: Shading on graphic representation denotes freeze-
dried vein material in correct stratigraphic position.
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 95
size: Indeterminate in hand specimen.
shape: Can't be determined in hand specimen.
orientation: Not apparent.
replacement: See description
description: Replacement: 100% with serpentine, talc, and magnetite.
primary mineral no.2
mineral name: Orthopyroxene
percent: 4-5
size: 2-6 mm
shape: Round
orientation: Not apparent.
replacement: See description
description: Replacement: As much as 90% with serpentine + talc.
primary mineral no.3
mineral name: Spinel
percent: 1- <1
size: < 1 mm
shape: Round to elliptical.
orientation: See orientation
replacement: As much as 10%, rimmed with magnetite.
description: Orientation: Piece 10 defined by long axes of elliptical spinel
grains.
primary mineral no.4
mineral name: Clinopyroxene
percent: < 1
size: 4 mm
shape: Round
orientation: Not apparent.
replacement: 0%, fresh.
***** SECONDARY PHASES *****
percent: 99
texture: Olivine replaced by alternating bands of dark and light secondary
phases, orthopyroxene pseudomorphed by bastite and rimmed by
talc, spinel rimmed by magnetite.
veins: As much as 5% in rock pieces, 1 mm to 2 cm thick.
phase two comments:
White talc veins as wide as 1 mm, blue-green opaline serpentine veins 2 mm
wide, rich veins in Pieces 6-7 and 13 (see deformation section for
description)
leg : 109 section: 01 unit/subunit : 0005
hole: 0670A top int: 0 cm observer code: KUE
core: 008R pieces : 1-5
rock name: HARZBURGITE
color : Green
layering : Not apparent.
deformation: Defined by elongated orthopyroxene in Piece 1.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 90
size: < 1 mm
shape: Round
orientation: Not apparent
replacement: See description
description: Replacement: As much as 80% with serpentine + magnetite.
primary mineral no.2
mineral name: Orthopyroxene
percent: 5-15
size: 3-6 mm
shape: Round to elliptical and elongate.
orientation: See description
replacement: 1-20% by bastite.
description: Orientation: Defined by long axes of elongate orthopyroxene in
Piece 1.
primary mineral no.3
mineral name: Clinopyroxene
percent: 1-2
size: 1-2 mm
shape: Round
orientation: Not apparent
replacement: Fresh
primary mineral no.4
mineral name: Spinel
percent: 1
size: 1-2 mm, some as large as 5 mm
shape: Blocky to elliptical.
orientation: See description
replacement: < 5% with magnetite.
description: Orientation: Defined by long axes of elliptical spinel grains.
***** SECONDARY PHASES *****
percent: 50-70
texture: Mesh texture serpentine, magnetite replacing olivine, bastite
pseudomorphing orthopyroxene, magnetite rims to spinel.
veins: < 1%, < 1 mm thick.
phase two comments:
Black magnetite-filled veins, and short (< 3 mm) serpentine-filled white
veins.
leg : 109 section: 01 unit/subunit : 0006
hole: 0670A top int: 0 cm observer code: KUE
core: 009R pieces : 1, 3, 9 and 12
rock name: SERPENTINIZED HARZBURGITE
color : Green to black-green
layering : No primary layering apparent.
deformation: Foliation defined by long axis of tabulated orthopyroxene.
***** MAIN COMMENTS *****
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 80-90
size: 2-4 mm in Piece 1, <0.2 mm in others
shape: Elongated in Piece 1.
orientation: Not apparent.
replacement: See description
description: Replacement: 50% with serpentine, magnetite, and talc in Piece 1;
approximately 70% with same minerals in other pieces.
primary mineral no.2
mineral name: Orthopyroxene
percent: 7-18
size: As large as 10 mm
shape: Round to tabular.
orientation: See description
replacement: 10-20% by talc and serpentine.
description: Orientation: Defined by long axes of elliptical orthopyroxene
grains.
primary mineral no.3
mineral name: Clinopyroxene
percent: 1-2
size: As large as 3 mm
shape: Blocky to round.
orientation: Not apparent.
replacement: See description
description: Replacement: 5-10% with serpentine, talc, and possible chlorite.
primary mineral no.4
mineral name: Spinel
percent: 1
size: < 1 mm
shape: Blocky
orientation: Not apparent.
replacement: 0-5% with magnetite.
primary mineral comments:
Olivine: 2-4 mm in Piece 1, < 0.2 mm in other pieces
***** SECONDARY PHASES *****
percent: 64
texture: Olivine replaced by serpentine, magnetite, and talc in a mesh
structure; orthopyroxene pseudomorphed by bastite; clinopyroxene
replaced by serpentine, talc, and possibly chlorite.
veins: Approximately 2%, as large as 1 mm thick.
phase two comments:
Most veins are black, possible magnetite-filled; some veins are filled by
pale green material (probably serpentine + talc).
leg : 109 section: 01 unit/subunit : 0006
hole: 0670A top int: 0 cm observer code: KUE
core: 009R pieces : 2, 4-8, 10, 11, 13, and 14
rock name: SERPENTINITE.
color : Mottled black and white.
layering : No primary layering apparent.
deformation: Not apparent except for in Piece 14 where a 1-2 cm-wide
sheared zone exists, filled with antigorite, carbonate, and
tremolite.
***** MAIN COMMENTS *****
109-670A-10W-1: drill cuttings: serpentinite, harzburgite, hyaloclastite,
basalt, and serpentine minerals. 109-670A-10W-2: drill cuttings:
serpentinite, harzburgite, hyaloclastite, basalt, and serpentine minerals.
***** PRIMARY MINERALS *****
primary mineral no.1
mineral name: Olivine
percent: 95-99
size: Indeterminate in hand specimen.
shape: Indeterminate in hand specimen.
orientation: Not apparent.
replacement: See description
description: Replacement: 100% with serpentine, magnetite, talc, and
carbonates.
primary mineral no.2
mineral name: Orthopyroxene
percent: 0-4
size: As large as 4 mm
shape: Tabular.
orientation: Not apparent.
replacement: 70-100% by bastite.
primary mineral no.3
mineral name: Spinel
percent: 1
size: 1-2 mm
shape: Blocky to rounded.
orientation: Not apparent.
replacement: Fresh.
***** SECONDARY PHASES *****
percent: 99%
texture: Distinctive "tortoise-shell" texture, except for Piece 8 which
has a net texture; polygonal domains are defined by black
serpentine minerals.
veins: Pieces 6, 10, and 14: 5-20%, as large as 1 cm.
phase two comments:
Filled with light-colored serpentine mineral, possibly antigorite (Pieces
6, 10, and 14); Piece 14 also contains veins composed of tremolite,
carbonate, and antigorite; Piece 11 contains clay plus sheet silicate-rich
matrix containing rubble.
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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