SUBJECT INDEX

A

accretion, crust, A1:2-5; B(narrative):9-12
actinolite
alteration, A3:40
alteration vs. depth, A3:141
geochemistry, B4:11; B9:9-10
greenschist facies, B9:18-19
magmatic structures, A3:60
photomicrograph, B9:66
sulfides, B7:6
See also ferro-actinolite
adcumulates, lower oceanic crust, B(synthesis):22-23, 38
age, trondhjemite, A1:7
albite
alteration, B1:5
gabbro, B10:9-11
magnesium number, A3:49
veins, B9:8, 20, 29
See also anorthite/(anorthite+albite) ratio
alteration
compressional wave velocity, B5:7
downhole distribution, A3:33-34
geochemistry, A3:51
lithologic units, B6:3-14
minerals, A3:266
plagioclase, A1:14
shear zones, A1:5
sulfides, B7:6
vs. depth, A1:57
See also hydrothermal alteration
alteration halos, photograph, A1:61; A3:146-147, 161
alteration rims, photograph, A3:147
aluminum
amphibole, B4:11, 20-21
biotite, B9:11
clinopyroxene, B4:10; B10:12
gabbroic rocks, B8:3-4
high-temperature microscopic veins, B4:12-13
hornblende, B10:14
orthopyroxene, B10:14
phlogopite, B9:11
photomicrograph, B4:26, 30, 32
veins, B9:16, 33-36
vs. depth, B1:13
vs. magnesium number, B4:11, 37
vs. sodium + potassium, B4:11, 37, 41
vs. titanium, B4:37
See also strontium/aluminum ratio
aluminum oxide
amphibole, B9:10
apatite, B9:13
chlorite, B9:11
clinopyroxene, B4:10
diopside, B9:10
epidote, B9:12
gabbroic rocks, B6:16-17; B8:4-14
mica, B9:11
natrolite, B9:13
orthopyroxene, B4:10
titanite, B9:14
vs. depth, B6:35
vs. iron oxide, B9:32
vs. magnesium number, B4:34; B10:41
vs. scandium, B8:23
vs. titanium oxide, B4:34-35
See also calcium oxide/aluminum oxide ratio; iron oxide/aluminum oxide ratio
aluminum oxide/magnesium oxide ratio, vs. strontium, A3:51, 173
amphibole
alteration, B6:3-4
alteration vs. depth, A3:139
chemical composition, B4:10-11, 41-42; B9:43-46
composition, B4:36-37
formation temperature, B4:11-12
gabbro, B8:3-14
geochemistry, B8:52-53
high-temperature microscopic veins, B4:25-26
lithologic units, B6:3-14
modal composition, A3:18
olivine gabbro, B4:6-7
olivine gabbro analysis, B4:53-54
photograph, A3:148
photomicrograph, A3:128-129; B4:31-32; B9:64-66
sulfides, B7:5
textures, B4:8-9
thin sections, A3:24-25
veins, A3:42-43; B4:7-8; B9:3-5, 9-10, 17-19, 30
See also actinolite; edenite; hornblende; magnesiohornblende; veins
amphibole, brown
alteration vs. depth, A3:140
high-temperature minerals, A3:35
amphibole, dark green, high-temperature minerals, A3:34-35
amphibole, green
alteration vs. depth, A3:140
moderate-temperature minerals, A3:36
amphibole, magnesium-iron, high-temperature minerals, A3:35
amphibole, secondary
photograph, A3:161
vs. depth, A3:135
amphibole formula, calculation, B4:20-21
amphibole gneiss
lithologic units, B6:3
magnetic susceptibility, B11:16
photograph, A3:160
 
amphibolite, gneissic, structure, A1:7-8
amphibolite, mylonite, A1:14-16
amphibolite facies
metamorphism, A3:45-47
shear zones, A1:8-10
veins, B9:17-19
analcime, alteration, B1:5
anhedral crystals
lithologic units, A3:19-20
scan, A3:125
anisotropy
magnetic susceptibility, A3:75, 222, 288-299
seismic reflection, B5:6
velocity in olivine gabbro, B2:4
vs. depth, B5:32
anorthite
composition vs. depth, B(synthesis):52, 61; B8:12-13, 28-30
crystal mush, B10:23-25
gabbroic rocks, B6:21; B10:9-11, 55
magnesium number, A3:49
olivine gabbro host vs. microgabbro, B8:22
percent in magmatic and vein plagioclase, B4:27
veins, B9:8, 29
vs. depth, B4:22; B6:33; B8:12-13, 28-30; B10:53
vs. forsterite, B10:54
vs. iron oxide, B10:35; B11:68
vs. magnesium number, B8:18
vs. magnesium number in clinopyroxene, B10:42
vs. magnesium number in hornblende, B10:42
vs. magnesium number in olivine, B10:42
vs. magnesium number in orthopyroxene, B10:42
anorthite/(anorthite+albite) ratio
vs. strontium/aluminum ratio, A3:51, 174
vs. titanium oxide, A3:49, 167
anthophyllite, high-temperature minerals, A3:35
apatite
chemical composition, B9:56
modal composition, A3:18; B6:10
olivine gabbro, B4:6-7
veins, B9:13
aragonite, low-temperature minerals, A3:38
Atlantis II Fracture Zone
bathymetry, B5:33
geology, A1:1-70; B(synthesis):47; B(narrative):10-12
lower oceanic crust, B5:1-71
attenuation
data summary, B5:42-69
oceanic crust, B5:14-15
seismic waves, B5:8-9
statistical analysis, B5:70
velocity, B2:3-4, 15-17
vs. depth, B5:31
waveforms, B5:40
augite
exsolution, A3:20
gabbroic rocks, B10:11-12
grain size, A3:16-17
grain size vs. depth, A3:114
igneous rocks, A1:11
lithologic units, A3:16-17; B6:9
photomicrograph, A3:116
reaction textures, A3:21
relative abundance, A3:103-104
scan, A3:125
augite/plagioclase ratio, vs. calcium oxide/aluminum oxide ratio, A3:21, 119
azimuth, vs. depth, B5:32

B

barium
gabbroic rocks, B6:16
veins, B9:16
basalt
chemical composition, B(synthesis):68
melts, B10:26-27
See also ferrobasalt
basalt liquidus temperature, vs. magnesium number, B8:19
bathymetry
Atlantis Bank, A1:6, 45-46; B5:33
map, A4:1-13
biotite, veins, B9:11
blebs
olivine gabbro, B4:6-7
sulfides, A3:27
borehole azimuth, vs. depth, A3:232
borehole deviation, vs. depth, A3:232
boreholes
logging, A3:87
recovery vs. depth, A3:229
breccia
Formation Microscanner imaging, A3:238-239
magnetic susceptibility, B11:13, 48, 56
breccia, magmatic
core photograph, A3:195
magmatic structures, A3:59
magnetic susceptibility, B11:16
vs. depth, A3:193
breccia, tectonic, core photograph, A3:195
breccia, vein, magnetic susceptibility, B11:15-16
brittle deformation
gabbro, A1:15, 18-22; B9:19
magmatic structures, A3:59-63
magnetic susceptibility, B11:16
microstructures, A3:64
brittle microstructures, photomicrograph, A3:194
buoyancy, differentiation, B(synthesis):23-24

C

calc-silicates, moderate-temperature minerals, A3:37
calcite
alteration vs. depth, A3:138
low-temperature minerals, A3:38
magmatic structures, A3:60
photomicrograph, B9:66
See also veins
calcite, vein-forming, X-ray diffraction data, A3:163
calcium
gabbroic rocks, B8:3-4
high-temperature microscopic veins, B4:12-13
hornblende, B10:14
photomicrograph, B4:26, 30, 32
veins, B9:16, 33
calcium number
correlation with clinopyroxene, B8:24
gabbroic rocks, B8:7, 11
olivine gabbro, A3:21; B3:3
vs. clinopyroxene number, B8:24
vs. depth, B8:12-13, 27, 29-30; B10:45-52
vs. gabbro magnetic susceptibility, B11:27-28
vs. magnesium number, A3:21, 120; B3:8; B8:20
vs. sodium number, B3:8
vs. titanium oxide, A3:21, 121
calcium oxide
clay minerals, B9:14
diopside, B9:10
epidote, B9:12
gabbroic rocks, B6:18; B8:4-14
natrolite, B9:13
orthopyroxene, B4:10
thomsonite, B9:13
veins, B9:15
vs. depth, B6:42
vs. magnesium number, B10:41
vs. scandium, B8:23
vs. titanium oxide, B4:35
calcium oxide/aluminum oxide ratio
gabbroic rocks, B8:7, 11, 14
vs. augite/plagioclase ratio, A3:21, 119
vs. magnesium number, B8:20
vs. scandium, B8:23
calcium oxide/sodium oxide ratio, thomsonite, B9:13
caliper logs
electrofacies, A3:247-251
shear wave velocity, B5:41
vs. depth, A3:232, 234, 236; B5:26
carbon dioxide
gabbroic rocks, B6:18
veins, B9:15
volatiles, A3:281
vs. depth, B6:47
carbon isotopes, carbonates, B1:6
carbonates
chemical composition, B9:59
genesis, B1:6
low-temperature minerals, A3:38
photomicrograph, B9:65
veins, A3:43; B9:6-7, 14
See also aragonite; calcite; veins
cataclasis
gabbro, A1:18-22; B9:19
intensity vs. depth, A3:196
cataclasite
core photograph, A3:195
photomicrograph, A1:65; A3:194
cataclastic deformation, magmatic structures, A3:59-63
cataclastic faults, vs. depth, A3:199
chadacrysts
mineral inclusions, A3:20; B4:8
photomicrograph, B4:29-30
chalcopyrite
gabbroic rocks, B7:5-9
moderate-temperature minerals, A3:37
photomicrograph, A3:128; B7:15-16
chemical discontinuities, intrusions, B10:18-25, 48-52
chemical stratigraphy, gabbro, A3:51-53; B(synthesis):14-17, 32-45; B10:16-21, 23-25
chlorite
alteration, B1:4-5; B6:4
chemical composition, B1:10; B9:49-50
greenschist facies, B9:18-19
magmatic structures, A3:60
moderate-temperature minerals, A3:36
sulfides, B7:6
veins, A3:45; B9:11
See also veins
chlorite, secondary, vs. depth, A3:135
chlorite/smectite composition, chemical composition, B1:10
chrome-spinel, photomicrograph, A3:127, 129-130
chromite. See ferrichromite
chromium
clinopyroxene, B10:12
gabbroic rocks, B6:19; B8:3-14
hornblende, B10:14
vs. clinopyroxene number, B8:25
vs. depth, B6:51; B8:12-13, 27, 29-30
vs. magnesium number, B8:25
vs. magnesium oxide, A3:49, 169
chromium diopside, lithologic units, A3:13-14
chromium oxide
diopside, B9:10
vs. magnesium number, B10:39, 41
clasts, core photograph, A3:195
clay minerals
chemical composition, B9:58
veins, B9:14
See also chlorite/smectite composition; montmorillonite, magnesium; smectite
cleavage planes, gabbro magnetic susceptibility, B11:22- 23
clinopyroxene
alteration, A3:40; B4:7-8
alteration vs. depth, A3:136
chemical composition, B4:9-10; B6:21, 71-73
classification, B4:33
composition, B4:34
correlation with calcium number and magnesium number, B8:24
crystal mush, B10:23-25
formation temperature, B4:11-12
gabbro, B8:3-14; B10:11-12
geochemistry, B8:43-48; B10:57
grain size, A3:113
intrusions, B10:18-19
lithologic units, B6:3, 5-14
magnetic susceptibility, B11:64
mineral chemistry, B10:15
modal composition, A3:18; B3:4-5
modal percent vs. modal percent olivine, A3:115
modal percent vs. modal percent plagioclase, A3:115
neoblasts, B9:17-19
olivine gabbro, B4:6-7
olivine gabbro analysis, B4:49-50
photograph, A1:61; A3:148
photomicrograph, A3:127; B4:23-24, 28-32, 39-40
sulfides, B7:6
textures, A3:63; B4:8-9, 12
veins, A3:41-42
vs. depth, B6:32; B10:38, 45-51
vs. major elements, B10:39
zoning, B10:12
clinopyroxene, altered, alteration vs. depth, A3:140
clinopyroxene, secondary, alteration vs. depth, A3:140
clinopyroxene magnesium number
vs. forsterite, B10:43
vs. hornblende magnesium number, B10:44
vs. orthopyroxene magnesium number, B10:43
clinopyroxene number
vs. calcium number, B8:24
vs. chromium, B8:25
vs. magnesium number, B8:24
vs. nickel, B8:25
vs. niobium, B8:26
vs. scandium, B8:23
vs. strontium, B8:26
vs. titanium oxide, B8:25
vs. vanadium, B8:25
vs. yttrium, B8:26
vs. zirconium, B8:26
clinopyroxenite, abundance and composition, A3:258-259
cobalt
gabbroic rocks, B8:4-14
sulfides, B7:6-9
cobalt, in pentlandite, vs. depth, B7:20
composite intervals, olivine gabbro, B(synthesis):12-14
compressional wave velocity
data summary, B5:42-69
downhole measurements, B5:9-10
igneous rocks, A1:25; A3:80-81, 307-312; B2:2-4, 7-11, 19
oceanic crust, B5:14
synthetic seismograms, B5:34-35
vs. density, B2:13; B5:29
vs. depth, A3:231; B5:25, 27
vs. porosity, B2:12; B5:28
vs. shear wave velocity, B2:14
well-logs, B5:36-37
confining pressure, attenuation, B5:8-9
cooling, crust, B9:21-22
copper
gabbro, A3:49-50
gabbroic rocks, B6:19; B8:4-14
sulfides, B7:7-9
vs. depth, B(synthesis):64; B6:53; B7:21; B8:12-13, 27, 29-30
vs. nickel, B7:22
core complexes, structure, B(narrative):10-12
core-log integration
average data, B5:71
downhole measurements, B5:12-13
cores, orientation, B5:39
correlation, gabbro, Site 735; B(synthesis):43-45
covariations, silicates, B10:15
cracking front model, magmatic fluids, B4:15
cracks. See microcracks
crescumulate texture
igneous layering, A3:29-30
olivine gabbro, A1:12
cross sections, tectonics, A1:49-50
crust
compressional wave velocity, B5:7
cooling, B9:21-22
structure, B(narrative):9-11
crust, lower oceanic
composition, B3:1-13; B6:1-82
contruction, B(synthesis):18-23
hydrothermal alteration, B1:1-24
magma chambers, B(synthesis):4-6
silicates, B10:1-60
structure, A1:2-5
velocity structure, B5:1-71
crust-mantle transition, lower oceanic crust, B(synthesis):22-23
cryptic variation, magnetic susceptibility, B11:10, 24-25
crystal mush, intrusions, B10:23-25
crystal zoning, mineral texture, A3:20
crystal-plastic deformation
intensity vs. depth, A3:185-186
magma chambers, B(synthesis):4-6
shear zones, A1:5, 15, 18-22; A3:55-58; B(synthesis):10
vs. magnetic susceptibility, B11:60, 63
See also crystal-plastic structures
crystal-plastic foliation
dip vs. depth, A3:188
intensity vs. depth, A3:184
crystal-plastic microstructures, photomicrograph, A3:190-191
crystal-plastic structures
correlation with amphibole veins, A3:211-212; B9:21-22
correlation with oxides, A3:210
differentiation, B10:19-22
magmatic structures, A3:56-58, 65-69; B6:5-7, 11-12, 23
photograph, A3:159
photomicrograph, A3:205-207
crystallization
lower oceanic crust, B(synthesis):18-22, 25-26
magmas, B10:24-25
pressure-temperature conditions, B8:5-14
temperature, B4:11-12
crystallization wall, nickel, B12:5
crystals, zoned, plagioclase veins, B9:4
cummingtonite, high-temperature minerals, A3:35
cumulates
crystallization, B8:5-14
geochemistry, B3:3-5; B6:23
lower oceanic crust, B(synthesis):18-22; B10:27
cupolas, lower oceanic crust, B(synthesis):20-22

D

debris flows, structure, A1:6-8
deformation
alteration, A3:38; B6:4-7
data summary, B5:42-69
fluids, B4:13-14
intergrowths, B4:13-14
magnetic susceptibility, B11:12, 29
oxide, A3:22-23, 124
relationship to oxide gabbros, B11:18-20
scan, A3:123-125
shear zones, A1:8-10, 18-22; B10:22
See also brittle deformation; cataclastic deformation; crystal-plastic deformation; crystal-plastic structures; plastic deformation; semi-brittle deformation 
deformation, low-temperature, magmatic structures, A3:59-61
deformation fabric, lithologic units, A3:19
deformation grades, vs. magnetic susceptibility, B11:63
deformation intensity
vs. depth, A3:126
vs. magnetic susceptibility, B11:60
demagnetization
gabbro, A3:71-77
vector end-point diagrams, A3:220-221
density
downhole measurements, B5:9-10
igneous rocks, A1:24; A3:79-80; B2:2-3, 7-11
vs. compressional wave velocity, B2:13; B5:29
density, bulk
vs. depth, A1:69; A3:228, 301
vs. GRAPE density, A3:223
vs. shear wave velocity, B5:29
density, GRAPE
igneous rocks, A3:77
vs. bulk density, A3:223
vs. depth, A3:227, 301
density logs
electrofacies, A3:247-251
vs. depth, A3:233-234; B5:26
detachment faults
fluid circulation, B9:21-22
structure, A1:7; B(narrative):9-12
diabase
composition, B(synthesis):46
tectonics, A1:6-8
differentiation
gabbro, B10:16-21, 24-27
intrusions, B(synthesis):11
magnetic susceptibility, B11:9-11, 17
shear zones, A1:3-5
differentiation, late-stage, lower oceanic crust, B(synthesis):23-24
dikelets, petrology, A3:32-33
dikes, basalt, Site 735; B(synthesis):44; B6:3
dikes, sheeted, oceanic crust, B5:13
diopside
alteration vs. depth, A3:138
chemical composition, B9:47
high-temperature minerals, A3:34
mineral chemistry, B10:36-37
photomicrograph, B9:64-65
veins, A3:42-43; B9:6, 10, 17-19, 31
See also chromium diopside; veins
diorite
petrology, A1:13-14; B6:11
veins, B8:9-10
See also gabbrodiorite; leucodiorite; oxide diorite; veins
dip
faults, A3:60-61, 198
foliation, A3:180, 244; B5:30
igneous contacts, A3:55-58
veins, A3:244
vs. depth, A3:182-183
downhole measurements
density, B5:9-12
shore-based interprestion, A3:92-96
Site 735, A1:25-26; A3:81-96, 314
drilling
photomosaic of hard rock base, B(narrative):20
Site 735, B(narrative):6-9

E

East Pacific Rise, lower oceanic crust, B(synthesis):23
edenite
geochemistry, B4:11; B9:9-10
veins, B9:30
electrofacies
fractures, A3:246
resistivity, A3:247-251
enstatite, mineral chemistry, B10:36-37
epidote
alteration, B6:3-5
alteration vs. depth, A3:138
chemical composition, B9:52
greenschist facies, B9:18-19
magmatic structures, A3:60
moderate-temperature minerals, A3:37
veins, A3:45; B9:12
See also veins
eruptions
lower oceanic crust, B(synthesis):18-22
melts, B10:26-27
euhedral crystals, lithologic units, A3:19-20
exsolution
gabbro magnetic susceptibility, B11:23
photomicrograph, A3:116; B11:66-67
exsolution textures
lithologic units, A3:20-21
photomicrograph, A3:116

F

fabric
correlation between magmatic and crystal-plastic fabrics, A3:181, 208
correlation with oxides, A3:210
gabbro, A1:18-22
intensity, A3:179
intensity vs. depth, A3:180-181
magmatic structures, A3:56-58, 179; B10:22
microscopic vs. macroscopic observations, A3:64-65
photomicrograph, A3:205-207
See also deformation fabric
fault zones, oceanic crust, B5:13
faulting, asymmetric, structure, B(narrative):9-12
faults
dip, A3:60-61, 198
dip vs. depth, A3:196
Formation Microscanner imaging, A1:25-26; A3:240
intensity vs. depth, A3:196, 211, 235
magmatic structures, A3:59-61
magnetic susceptibility, B11:17, 69
shear zones, A1:4-5
spreadsheets, A1:39
stereographs, A3:197
See also cataclastic faults; detachment faults; microfaults; reverse faults; transform faults
feeder pipes, lower oceanic crust, B(synthesis):20-22
feldspar
electron microprobe data, B1:23-24; B9:39-42
gabbro, B10:32
mineral texture, A3:19
sulfides, B7:6
veins, B9:8-9
See also albite; anorthite; anorthite/(anorthite+albite) ratio; augite/plagioclase ratio; plagioclase; potassium feldspar; quartz-microcline; quartz-plagioclase
feldspar, sodic, moderate-temperature minerals, A3:36
felsic rocks
chemical composition, A1:70
petrology, A1:13-14
See also veins
ferrichromite, photomicrograph, A3:130
ferro-actinolite, photomicrograph, B9:66
ferrobasalt
lower oceanic crust, B(synthesis):18-22
plutons, B(synthesis):53
ferrobasalt magma, lower oceanic crust,
B(synthesis):18-22
ferrogabbro
chemical composition, B8:13-14; B12:3-5
differentiation, B10:16-21
titanophile elements, B12:13
ferromagnesians
mineral chemistry, B10:15
vs. plagioclase, B10:15
ferrosilite, mineral chemistry, B10:36-37
fissures, lower oceanic crust, B(synthesis):20-22
fluid circulation
hydrothermal reactions, B9:21-22
shear zones, A1:16
fluid circulation, high-temperature, Oceanic Layer 3 gabbros, B4:1-56
fluid flow, microcracks, B10:17
fluid inclusions, magma chambers, B4:14
fluids
deformation, B4:13-14
high-temperature microscopic veins, B4:12-13
origin, B4:13-14
foliation
dip, A3:244; B5:30
dip vs. depth, A3:180, 184
intensity vs. depth, A3:180
magmatic structures, A3:54-58, 65-69; B10:22
metamorphism, A3:45-47
olivine gabbro, A1:12, 18-22; B6:4-7
photograph, A3:160, 209; B5:30
photomicrograph, A3:191
structure, A1:6-8
See also crystal-plastic foliation; gabbro
foliation, magmatic
igneous layering, A3:29-30
photomicrograph, A1:65; A3:205
foliation, mylonitic, dip vs. depth, A3:188
foliation intensity, crystal-plastic, vs. depth, A1:64
foliation intensity, magmatic, vs. depth, A1:64
foliation, retrograde, dip vs. depth, A3:188
Formation Microscanner imaging
faults, A3:240
structures, A3:240-243
vs. depth, B5:32
Formation Microscanner logs
Site 735, A3:92, 237-239
structure, A1:25-26
vs. depth, A3:234, 236
forsterite
composition vs. depth, B(synthesis):52, 61; B8:12-13, 28-30
crystal mush, B10:23-25
gabbro, B10:14, 55
olivine gabbro host vs. microgabbro, B8:22
vs. anorthite, B10:54
vs. clinopyroxene magnesium number, B10:43
vs. depth, B10:53
vs. magnetic susceptibility, B11:24-25, 69
vs. nickel oxide, B10:40
vs. orthopyroxene magnesium number, B10:43
forsterite magnesium number, vs. hornblende magnesium number, B10:44
fractional crystallization
gabbro, B3:4-5; B10:8-12
gabbroic rocks, B8:5-14
fracture zones
lower oceanic crust, B5:1-71
shear zones, A1:3-5
structure, B(narrative):9-11
fractures
electrofacies, A3:246
intergrowths, B4:13-14
magmatic structures, A3:61; B10:22
olivine, A3:39
orientation, A3:61
well-logs, A3:245
See also microfractures

G

gabbro
abundance and composition, A3:256-259
alteration, A1:14-16; B1:3-6
chemical composition, A1:70; A3:268-280; B(synthesis):46, 68
chemical stratigraphy, B(synthesis):14-17, 33-45; B10:16-21
clinopyroxene, B10:11-12
correlation, Site 735; B(synthesis):43-45
dredge hauls, B(narrative):18
fluid flow, B4:1-56
foliation, B5:30
geochemistry, B(synthesis):1-69; B12:1-18
grain size vs. depth, A3:114
lithologic units, A3:14; B6:6, 10-11
locations and composition, B(synthesis):67
magnetic susceptibility, B11:1-69
mineralogy, B(synthesis):17-18
model composition, B8:60
petrology, A1:12-14
photograph, A3:111, 209
scan, A3:123-125
stratigraphy and composition, B(synthesis):1-69
structure, A1:3-5; B(synthesis):25-26
tectonics, A1:6-8; B10:25-27
textures, A3:109
See also ferrogabbro; microgabbro; olivine gabbro; oxide gabbro; oxide-olivine gabbro
gabbro, foliated, photograph, A1:54
gabbro, gneissic, magnetic susceptibility, B11:61, 63
gabbro, iron-titanium, alteration photograph, A3:142
gabbro, mylonitized, photograph, A3:147
gabbro, oceanic, empirical velocity relations, B2:4
gabbro, orthopyroxene-bearing, abundance and composition, A3:256-259
gabbro, pegmatitic, magnetic susceptibility, B11:16
gabbro, troctolitic
abundance and composition, A3:256-259
chemical composition, A1:70
lithologic units, A3:13-15; B6:9-10
olivine, B10:14
gabbro, trondhjemitic, photograph, A3:147
gabbrodiorite, petrology, A3:31-33
gabbroic rocks
composition, B3:1-13; B6:82; B8:1-60
mineral chemistry, B4:45; B8:1-60
petrogenesis, B8:5-14
structures, A3:67-69
sulfides, B7:1-29
gabbronorite
abundance and composition, A3:256-259; B8:13-14
alteration photograph, A3:143
chemical composition, B3:4
clinopyroxene, B10:11-12
lithologic units, A3:14; B(synthesis):11; B6:5-6, 11
olivine, B10:14
orthopyroxene, B10:13-14
petrology, A1:12-14
plagioclase, B10:9-11
shear zones, A1:8-10
See also oxide gabbronorite
galena, gabbroic rocks, B7:5-7
gallium
gabbro, B8:4-14
veins, B9:16
gamma-ray logs 
A3:81-84
vs. depth, A3:233
geochemistry
database, B6:80
gabbros, B(synthesis):1-69; B6:14-20; B7:27-29; B8:1-60; B11:1-18
Site 735, A1:16-18; A3:21-22, 47-54; B3:1-13
geothermometry, veins, B9:17-19, 37
globules
photomicrograph, B7:15
sulfides, A3:27; B7:4-5, 8-9
gneiss. See amphibole gneiss; amphibolite
gneissic texture, deformation, B11:18-20, 61
gradational contacts, lithologic units, A3:16
grain size
igneous layering, A3:29-30
lithologic units, A3:16-17
olivine gabbro, A1:12
photograph, A3:133
grains, photomicrograph, B7:16
granite
petrology, A1:13
veins, A3:29; B8:9-10
granulite facies
metamorphism, A3:45-47
petrology, A1:15
shear zones, A1:5
veins, B9:17-19
greenschist facies, veins, B9:18-19

H

halos, veins, A3:29, 42
hematite
alteration vs. depth, A3:138
low-temperature minerals, A3:38
See also ilmenite-hematite-magnetite solid solution
high-temperature minerals, secondary minerals, A3:34-35
Hole 735B
geology, A1:1-70
narrative history, B(narrative):1-20
hornblende
alteration, A3:40
alteration vs. depth, A3:138
gabbro, B10:14-15
geochemistry, B10:60
mineral chemistry, B10:15
vs. depth, B10:46
See also magnesiohornblende
hornblende magnesium number
vs. clinopyroxene magnesium number, B10:44
vs. forsterite magnesium number, B10:44
hydrothermal alteration
gabbro, A1:14-16
titanium, A3:25-26
veins, B9:19-22
vs. depth, A3:135-141
vs. vein abundance, A3:137
See also alteration; magmatic-hydrothermal transition
hydrothermal alteration, low-grade, uplifted lower oceanic crust, B1:1-24
hydrothermal reactions
fluid circulation, B9:21-22
metamorphism, A3:45-47

I

iddingsite, low-temperature minerals, A3:38
igneous contacts
lithologic units, A3:15-16, 264
magmatic structures, A3:56
photograph, A3:132
schematic representation, A3:112
igneous layering
lithologic units, A3:29-30, 32-33
magmatic structures, A3:55
photograph, A3:133
igneous petrology, Site 735, A1:11-14; A3:12-33
igneous rocks
chemical composition, A3:268-280
lithostratigraphy, A3:12-16
photomosaic, A3:101
primary modes, A3:265
spreadsheets, A1:31-34
igneous seams, gabbro, B(synthesis):9
igneous series, chemical stratigraphy, B(synthesis):17
ilmenite
chemical composition, B9:54
melts, B8:8-9
modal composition, A3:18; B6:79
photomicrograph, A3:127-130
thin sections, A3:23-28
veins, B9:12-13
vs. gabbro magnetic susceptibility, B11:20-29
ilmenite-hematite-magnetite solid solution, melts, B8:8-9
inclusions
magnetite, B11:23
sulfides, B7:4-5
See also mineral inclusions
index properties
data summary, B5:42-69
igneous rocks, A3:79-80
Indian Ridge SW
fluid flow, B4:1-56
gabbros, B(synthesis):1-69
geology, A1:1-70; B(narrative):9-12
lithology, B6:1-82
silicates, B10:1-60
sulfides, B7:1-29
veins, B9:1-66
intergranular textures, photograph, A3:106
intergrowths
deformation, B4:13-14
photomicrograph, B4:29-32, 39-40
sulfides, B7:5-7
temperature, B4:11-12
textures, B4:8-9, 55
vs. depth, B4:22
intergrowths, myrmekitic, plagioclase veins, B9:4
intrusions
petrology, A1:12-14
photograph, A3:209
stratigraphy, B10:20-23
structure, A1:3-5, 8-10; A3:65-66
See also layered intrusions
intrusive contacts, lithologic units, A3:15-16
iron
enrichment, B10:18
gabbroic rocks, B6:16; B8:3-4
ilmenite, B9:13
sulfides, B7:5-9
iron, in pyrrhotite, vs. depth, B7:17
iron-titanium oxide
clinopyroxene, B4:10
gabbro, B3:3-5; B6:4; B8:3-14
geochemistry, B8:50-51
modal composition, A3:18
olivine gabbro, B4:6-7
iron/magnesium ratio, diopside, B9:10, 65
iron oxide
amphibole, B9:10
biotite, B9:11
chlorite, B9:11
epidote, B9:12
gabbroic rocks, B6:16-17; B8:4-14; B11:3
ilmenite, B9:13
mica, B9:11
titanite, B9:14
veins, B9:15
vs. aluminum oxide, B9:32
vs. anorthite, B10:35; B11:68
vs. depth, B6:37
vs. gabbro magnetic susceptibility, B11:20, 23
vs. modal oxide abundance, A3:21
vs. titanium oxide, B12:9
vs. zinc, A3:49, 170
iron oxide/aluminum oxide ratio, epidote, B9:12
iron oxide/titanium oxide ratio, gabbro, B12:3
iron ratio
amphibole, B4:20
vs. magnesium number, B4:42
vs. silicon, B4:20, 42
isotopes
hydrothermal alteration, B1:1-24
veins, B1:14
See also carbon isotopes; oxygen isotopes; strontium isotopes

J

joints, orientation, A3:61-63

K

Koenigsberger ratio
logarithm distribution, A3:219
magnetic intensity, A3:73
vs. depth, A3:218

L

lamination, igneous, igneous layering, A3:29-30
lanthanum/ytterbium ratio
gabbroic rocks, B6:20
vs. depth, B6:58
vs. ytterbium, B6:60
lanthanum oxide, titanite, B9:14
laterologs, vs. depth, A3:232
Layer 3, lower oceanic crust, B5:3-4
layered intrusions
lithologic units, B(synthesis):11, 36-45; B10:20-21
lower oceanic crust, B(synthesis):18-22
petrology, A3:30-33
lenses, sheared, scan, A3:124
leucodiorite
petrology, A1:13-14
photograph, A3:132
veins, A3:29; B8:9-10
Ligurian gabbros, differentiation, B10:26
liquids, crystallization, B8:5-14
liquidus temperature
vs. magnesium number, B8:19
vs. silica, B8:21
vs. titanium oxide, B8:21
lithium, gabbro, B8:4-14
lithologic units
chemical stratigraphy, B(synthesis):14-17
igneous rocks, A1:52; A3:261-263; B6:65
Site 735, A3:13-15
Unit I, B6:3
Unit II, B6:3
Unit III, B6:4
Unit IV, B6:4
Unit IX, A3:14; B6:6
Unit V, B6:5
Unit VI, A3:13-14; B6:5
Unit VII, A3:14; B6:5
Unit VIII, A3:14; B6:5
Unit X, A3:14; B6:6
Unit XI, A3:14-15; B6:6
Unit XII, A3:15; B6:6-7
lithology index, magnetic susceptibility, B11:1-69
lithostratigraphy
igneous rocks, A3:12-16; B(synthesis):7-11, 49; B5:24; B6:2-7, 29; B10:20-21
vs. depth, A3:102
low-temperature minerals, secondary minerals, A3:37-38

M

magma chambers
fluid inclusions, B4:14
lower oceanic crust, B(synthesis):20-22
models, B(synthesis):4-6, 37-38, 48; B6:22
magma injection
lower oceanic crust, B(synthesis):22-23
magnetic susceptibility, B11:10
magmas
crystallization, B10:24-25
injection, B(synthesis):12-14
lithologic units, A3:15-16
petrology, A3:31-33
structure, A1:2-5
veins, B9:19-22
magmas, mafic, sulfides, B7:7-9
magmatic foliation. See foliation, magmatic
magmatic structures, textures, A3:54-58, 65-69
magmatic-hydrothermal transition, fluid flow, B4:1-56
magmatic-metamorphic transition, fluid migration, B4:4-5
magnesiohornblende
geochemistry, B4:11; B9:9-10
photomicrograph, B9:66
veins, B9:30
magnesium
biotite, B9:11
gabbroic rocks, B8:3-4
veins, B9:33-34
See also iron/magnesium ratio
magnesium number
amphibole, B4:20
basalt glasses, Atlantic II Fracture Zone, B10:27
chemical stratigraphy, A3:51-53; B(synthesis):16, 33-45; B6:22-23
clinopyroxene, B8:18-19; B10:12
correlation with clinopyroxene, B8:24
crystal mush, B10:23-25
diopside, B9:10
gabbro, A3:53; B(synthesis):17-18; B3:3; B6:16-17, 21; B8:5-14; B12:3
hornblende, B10:14
igneous rocks, A1:17-18; A3:49-50
intrusions, B10:18-19
olivine, B8:18-19
olivine gabbro, A3:21
olivine gabbro host vs. microgabbro, B8:22
orthopyroxene, B8:18-19; B10:14
silicates, B10:42
vs. aluminum, B4:11, 37
vs. aluminum oxide, B4:34; B10:39, 41
vs. anorthite, B8:18
vs. basalt liquidus temperature, B8:19
vs. calcium number, A3:21, 120; B3:8; B8:20
vs. calcium oxide, B10:41
vs. calcium oxide/aluminum oxide ratio, B8:20
vs. chromium, B8:25
vs. chromium oxide, B10:39, 41
vs. clinopyroxene number, B8:24
vs. depth, A1:62; A3:48-50, 52, 166, 175-176; B(synthesis):51, 57-60, 64-66; B3:9; B4:22; B6:31, 40-41; B7:14; B8:12-13, 27-30; B10:45-51; B12:8
vs. forsterite, B10:43-44
vs. gabbro magnetic susceptibility, B11:22-23, 27-28
vs. iron ratio, B4:42
vs. magnetic susceptibility, B11:65
vs. nickel, B8:25
vs. niobium, B8:26
vs. potassium oxide, B10:41
vs. sodium number, B3:8
vs. sodium oxide, B10:39, 41
vs. strontium, B8:26
vs. titanium oxide, B4:34; B8:25; B10:39, 41; B11:64
vs. vanadium, B8:25
vs. yttrium, B8:26
vs. zirconium, B8:26
See also forsterite magnesium number; hornblende magnesium number; orthopyroxene magnesium number
magnesium oxide
carbonates, B9:14
chlorite, B9:11
gabbro, A3:53
gabbroic rocks, B6:17; B8:4-14
mica, B9:11
phlogopite, B9:11
veins, B9:15
vs. chromium, A3:49, 169
vs. depth, B6:39
vs. nickel, A3:49, 168
See also aluminum oxide/magnesium oxide ratio
magnetic anomalies
gabbro, B(synthesis):25-26
maps, A1:47
structure, A1:7-8, 22-23
magnetic declination
gabbro, A3:71-72
vs. depth, A3:214-215, 217
magnetic inclination
gabbro, A1:22-23; A3:71-72
logarithm distribution, A3:219
vs. depth, A1:67; A3:214-215, 217, 222
magnetic intensity
gabbro, A3:71-77
vs. depth, A3:214, 217
magnetic properties, discrete samples, A3:282-287
magnetic susceptibility
anisotropy, A3:75, 222, 288-299
igneous rocks, A1:24; A3:70-77
lithology index, B11:1-69
physical properties, A3:77-78
response functions of sensor, A3:224
vs. deformation grades, B11:63
vs. deformation intensity, B11:60
vs. depth, A1:67; A3:213, 225-226, 300; B11:8-10, 33-34, 36-54, 56, 58, 60, 62
vs. forsterite, A11:24-25, 69
vs. gabbro mineral composition, B11:20-29
vs. magnesium number, B11:65
vs. titanium oxide, B11:65
vs. vein numbers, B11:57
magnetic susceptibility, minicore, vs. sensor magnetic susceptibility, B11:35
magnetic susceptibility, sensor, vs. minicore magnetic susceptibility, B11:35
magnetic susceptibility, volume
logarithm distribution, A3:219
vs. depth, A3:218
magnetic susceptibility logs
gabbros, B11:10-11
vs. depth, A1:68
magnetite
deformation, A3:22-23, 124
high-temperature minerals, A3:35
inclusions, B11:23
magnetic susceptibility, A3:70-71
modal composition, A3:18
photomicrograph, A3:127; B11:66-67
thin sections, A3:23-28
vs. gabbro magnetic susceptibility, B11:20-29
See also ilmenite-hematite-magnetite solid solution
major elements
clinopyroxene, B10:11-12, 39
gabbroic rocks, B3:1-13; B6:16-18, 81; B8:3-8, 10-14, 54-59; B12:1-18
igneous rocks, A1:17-18
veins, B9:60-61
manganese, gabbroic rocks, B8:3-4
manganese oxide
chlorite, B9:11
diopside, B9:10
gabbroic rocks, B6:17; B8:4-14
ilmenite, B9:13
vs. depth, B6:38
mantle
structure, A1:3
thermal boundary layer, B8:8
See also crust-mantle transition
marcasite, low-temperature minerals, A3:38
mean destructive field, vs. depth, A3:218
megamullions, structure, B(narrative):9-12
melts
crystallization, B8:5-14; B10:27
layered intrusions, A3:30-33; B10:19-22
model composition, B8:60
shear zones, A1:5; B6:22-25
tectonic controls of migration, B10:22
metagabbro
foliation, B5:30
lithologic units, B6:3, 8
photomicrograph, B5:30
metamorphic petrology, A1:14-16; A3:33-47; B1:3-6
metamorphic rocks, spreadsheets, A1:35-38
metamorphism
neoblasts, B9:17-19
shear zones, A1:5; B6:20-23
temperature, A3:45-47
See also magmatic-metamorphic transition
metamorphism, high-temperature, gabbro, A1:15
mica
chemical composition, B9:48
veins, B9:11
microcline. See quartz-microcline
microcracks
attenuation, B5:8-9
differentiation, B10:17
microfaults, magmatic structures, A3:59-61
microfractures
intensity vs. depth, A3:204
orientation, A3:63
photograph, A3:189
microgabbro
abundance and composition, A3:258-259; B8:13-14
composition vs. that of olivine gabbro, B8:22
intrusions, B10:20
lithologic units, A3:15, 65-66
origin, B8:10
petrology, A1:12-14; A3:32-33
photograph, A3:108, 209
See also olivine microgabbro; oxide microgabbro; oxide olivine microgabbro
microgabbro, troctolitic
photograph, A3:107
shear zones, A1:8-10
microstructures
gabbros, A3:63-64
textures, A3:63
See also brittle microstructures; crystal-plastic microstructures; semi-brittle microstructures; structures
microstructures, high-temperature, recrystallization, A3:63-64
mid-ocean ridges, magmatic-hydrothermal transition, B4:1-56
mineral chemistry
gabbroic rocks, B4:45; B8:1-60
silicates, B10:1-60
sulfides, B7:5-7, 26
mineral composition, vs. gabbro magnetic susceptibility, B11:20-29
mineral inclusions, lithologic units, A3:20-21
mineral integrowths, lithologic units, A3:21
mineral textures, lithologic units, A3:19-20
mineralogy
data summary, B5:42-69
downhole variations, B6:13-14
gabbro, B(synthesis):17-18
modal composition
igneous layering, A3:29-30; B8:10-11
lithologic units, A3:17-18; B6:7-14, 61-64
modal oxide abundance
vs. iron oxide, A3:21
vs. titanium oxide, A3:21
moderate-temperature minerals, secondary minerals, A3:36-37
montmorillonite, magnesium
alteration, B1:5
chemical composition, B1:10
mullions. See megamullions
mylonite
amphibolite, A1:14-16
differentiation, B10:18-19
lithologic units, A3:15
magnetic susceptibility, B11:18-20, 63
photograph, A3:187
photomicrograph, A1:65
See also gabbro
mylonitic foliation. See foliation, mylonitic
mylonitic texture
lithologic units, A3:18-19; B6:3
microscopic vs. macroscopic observations, A3:64-65
photomicrograph, A3:207
myrmekitic texture, felsic veins, B9:33

N

natrolite
alteration, B1:5
photomicrograph, B9:65-66
veins, B9:13
natrolite, vein-forming, X-ray diffraction data, A3:145
neoblasts
gabbro magnetic susceptibility, B11:23
veins, B9:17-19
nickel
gabbro, A3:53; B(synthesis):43; B3:3; B12:5
gabbroic rocks, B6:19; B8:3-14
olivine, B10:14
sulfides, B7:5-9
veins, B9:16
vs. clinopyroxene number, B8:25
vs. copper, B7:22
vs. depth, B(synthesis):58-59, 64-66; B3:9; B6:50; B7:21; B8:12-13, 27, 29-30
vs. magnesium number, B8:25
vs. magnesium oxide, A3:49, 168
vs. scandium, B3:11
vs. titanium oxide, B12:10
nickel, in pentlandite, vs. depth, B7:19
nickel, in pyrrhotite, vs. depth, B7:18
nickel oxide, vs. forsterite, B10:40
niobium
gabbro, A3:50; B6:16; B8:4-14
vs. clinopyroxene number, B8:26
vs. magnesium number, B8:26
vs. zirconium, B3:7
See also zirconium/niobium ratio
nontronite, chemical composition, B1:10
norite. See gabbronorite; oxide gabbronorite
nuclear logs, A3:88-89

O

Oceanic Layer 3, fluid flow, B4:1-56
oikocrysts
lithologic units, A3:19
photomicrograph, B4:29-30
oligoclase, veins, B9:20
olivine
alteration, A3:39; B6:4-6
alteration vs. depth, A3:136
composition vs. depth, B(synthesis):52, 61; B6:21
downhole variations, B6:13-14
exsolution, A3:20
gabbro, B(synthesis):40; B6:66-68; B8:3-14; B10:14
geochemistry, B8:31-35; B10:58
grain size, A3:16-17, 113
grain size vs. depth, A3:114
high-temperature microscopic veins, B4:25-26
igneous rocks, A1:11
lithologic units, A3:15; B6:3-9
magnetic susceptibility, B11:25-26
mineral chemistry, B10:15
modal composition, A3:17-18
modal percent vs. modal percent clinopyroxene, A3:115
olivine gabbro, B(synthesis):12-14
olivine gabbro analysis, B4:48
photograph, A1:61; A3:148
photomicrograph, A3:117, 127, 129, 206-207; B4:23-24, 28-30, 39-40
pseudomorphs, A3:37
reaction textures, A3:21
relative abundance, A3:103
scan, A3:125
sulfides, B7:6-9
textures, A3:63
vs. depth, B6:30; B10:45-51
olivine, altered, alteration vs. depth, A3:139
olivine gabbro
abundance and composition, A3:256-259
chemical composition, A1:70; B3:2-13; B8:13-14
chemical stratigraphy, B(synthesis):35-37, 41-45
clinopyroxene, B10:11-12
composition vs. that of microgabbro, B8:22
differentiation, B10:16-21
grain size, B(synthesis):12-14
high-temperature microscopic veins, B4:6-7
hornblende, B10:14
lithologic units, A3:14-15; B(synthesis):7-14; B6:3-7, 9
lower oceanic crust, B(synthesis):18-22; B10:22-25
magnetic susceptibility, B11:8, 18-20, 47, 53
olivine, B10:14
petrology, A1:12-14
photograph, A1:53-56; A3:105-108, 110, 148
photomicrograph, B4:23-24, 28-32, 39-40; B11: 66-67
plagioclase, B10:9-11
scan, A3:125
structure, A1:3-5, 8-10
thickness vs. cumulative thickness at sequence centers, B(synthesis):50, 54-56
See also oxide olivine microgabbro; oxide-olivine gabbro; veins
olivine gabbro, compound, lithologic units, A3:13-14
olivine gabbro, pegmatoidal, photograph, A1:55
olivine gabbro, varietextured, photograph, A1:55
olivine microgabbro
petrography, B6:9
photograph, A1:53
Oman ophiolite, lower oceanic crust, B(synthesis):22-23; B10:25-27
opaque minerals
lithologic units, A3:22-23
modal composition, A3:18
ophiolite, structure, A1:2-5
ophiolite model, petrology, A3:31-33; B10:25-27
ophitic texture
lithologic units, A3:19
olivine gabbro, B4:6-7
photograph, A3:105
orthoclase, gabbro, B10:9-11
orthopyroxene
alteration, A3:39-40; B4:7-8
chemical composition, B4:10
composition, B4:35; B6:69-70
formation temperature, B4:11-12
gabbro, B8:3-14; B10:13-14
geochemistry, B8:49; B10:59
high-temperature microscopic veins, B4:25-26
igneous rocks, A1:11
lithologic units, A3:14; B6:4-14
mineral chemistry, B10:15
mineral texture, A3:19
modal composition, A3:18
neoblasts, B9:17-19
olivine gabbro, B4:6-7
olivine gabbro analysis, B4:51-52
photomicrograph, B4:31-32, 39-40
relative abundance, A3:104
selvage, B10:13-14
textures, B4:8-9
vs. depth, B6:31; B10:46-51
See also gabbro
orthopyroxene magnesium number
vs. clinopyroxene magnesium number, B10:43
vs. forsterite, B10:43
outcrops, maps, A1:48
overpressure, lower oceanic crust, B(synthesis):22-23
overprinting
fabric, A3:58, 65
lithologic units, A3:19
magnetic intensity, A3:74-75
oxide-olivine gabbro
chemical composition, B3:2-13
clinopyroxene, B10:11-12
differentiation, B10:16-21
olivine, B10:14
plagioclase, B10:9-11
oxide-olivine microgabbro, chemical composition, B3:2-13
oxide diorite, chemical composition, B3:2-13
oxide gabbro
abundance and composition, A3:258-259
chemical composition, A1:70; B3:2-13; B8:13-14; B12:3-5
chemical stratigraphy, B(synthesis):39-43
clinopyroxene, B10:11-12
deformation, B11:18-20
differentiation, B(synthesis):23-24
Formation Microscanner imaging, A3:238-239
lithologic units, A3:14-15; B(synthesis):7-11; B6:4, 11-12
magnetic susceptibility, B11:12-13, 45, 47-49, 51, 54
melts, B8:8-9; B10:22
olivine, B10:14
petrology, A1:12-14; A3:31-33
plagioclase, B10:9-11
relationship to deformation, B11:18-20
relationship to felsic veins, B11:17
See also oxide microgabbro; oxide-olivine gabbro
oxide gabbro, porphyroblastic, magnetic susceptibility, B11:61
oxide gabbronorite
lithologic units, A3:14; B6:5, 12-13
magnetic susceptibility, B11:11-12
oxide microgabbro, petrography, B6:11-12
oxide troctolite, chemical composition, B3:2-13
oxides
crystal-plastic deformation, A3:67, 210
gabbroic rocks, B6:16-18
high-temperature minerals, A3:35
igneous rocks, A1:11; A3:260
lithologic units, A3:22-23, 124
magnetic susceptibility, B11:17
photograph, A3:148
photomicrograph, A3:128
scan, A3:123
thin sections, A3:23-28
veins, A3:29
vs. depth, A3:122, 126
vs. gabbro magnetic susceptibility, B11:20-29
vs. titanium oxide, A3:119
See also hematite; iron-titanium oxide; magnetite
oxygen isotopes, phyllosilicates, B1:5-6
oxyhydroxides, low-temperature minerals, A3:38

P

paleomagnetism, Site 735, A1:22-23; A3:69-77
paragenesis, sulfides, B7:5-9
pargasite, geochemistry, B4:11, 20
pegmatite
lithologic units, A3:14
olivine gabbro, A1:12
pentlandite
gabbroic rocks, B7:5-9
photomicrograph, B7:15, 23
textures, A3:27
peridotite, serpentinized
dredge hauls, B(narrative):18
tectonics, A1:6-8
petrogenesis, gabbroic rocks, B8:5-14
petrography
high-temperature microscopic veins, B4:6-9
lithologic units, A3:17-21; B6:7-14
sulfides, B7:4-5, 24-25
veins, B9:3-8
phase equilibria
gabbro, B8:5-14
modal composition, A3:18
petrology, A1:14
phenocrysts, lower oceanic crust, B(synthesis):18-22, 39
phlogopite
alteration, B1:4-5
chemical composition, B1:10
veins, B9:11
phosphorus, gabbroic rocks, B8:3-4
phosphorus oxide
gabbro, B3:4
gabbroic rocks, B6:18; B8:4-14
vs. depth, B(synthesis):60; B6:45
zircon, B9:13-14
photoelectric effect logs, vs. depth, A3:233-234
phyllosilicates
alteration, B1:4-5
chemical composition, B1:10
electron microprobe data, B1:15-22
physical properties, Site 735, A1:24-25; A3:77-81, 302; B2:1-19
pigeonite, gabbro, B10:13-14
plagioclase
alteration, A1:14; A3:40-41; B4:7-8; B6:3-7
alteration vs. depth, A3:136
composition vs. depth, B(synthesis):52, 61
downhole variations, B6:13-14
gabbro, B(synthesis):40; B6:74-78; B8:3-14; B10:9-11
geochemistry, B3:3-5; B8:36-42; B10:56
grain size, A3:16-17, 113
grain size vs. depth, A3:114
high-temperature microscopic veins, B4:25-26
high-temperature minerals, A3:35
igneous rocks, A1:11
intrusions, B10:18-19
lithologic units, B6:3-14
magmatic structures, A3:60
mineral chemistry, B10:15, 32-34
mineral inclusions, A3:20
mineral texture, A3:19
modal composition, A3:18
modal percent vs. modal percent clinopyroxene, A3:115
olivine gabbro, B4:6-7
olivine gabbro analysis, B4:46-47
photograph, A1:61; B4:23-24
photomicrograph, A3:118, 127-130, 190-191, 206-207; B4:28-30, 39-40; B9:63
relative abundance, A3:103-104
scan, A3:125
sulfides, B7:5
textures, A3:63
veins, A3:41-43; B9:3-6, 8-9, 17-19, 29
vs. depth, B6:33; B10:45-52
vs. ferromagnesians, B10:15
vs. gabbro magnetic susceptibility, B11:22-23
zoning, B9:17; B10:10
See also albite; anorthite; augite/plagioclase ratio; quartz-plagioclase; quartz-plagioclase, granophyric; veins
plagioclase, altered, alteration vs. depth, A3:141
plagioclase, neoblastic, metagabbro, B6:3, 12
plagioclase, secondary
alteration vs. depth, A3:141
photograph, A3:161
vs. depth, A3:135
plastic deformation, magnetic susceptibility, B11:16
platinum group, gabbroic rocks, B7:1-29
plutons
chemical stratigraphy, B(synthesis):14-17
ferrobasalt, B(synthesis):53
lower oceanic crust, B(synthesis):20-22; B11:28-29
poikilitic texture
lithologic units, A3:19; B6:4
olivine gabbro, B4:6-7
porosity
chemical stratigraphy, B(synthesis):14-17
downhole measurements, B5:9-10
igneous rocks, B2:2-3, 7-11
oceanic crust, B5:13
vs. compressional wave velocity, B2:12; B5:28
vs. shear wave velocity, B5:28
porosity logs
electrofacies, A3:247-251
vs. depth, A3:233-235; B5:26
porphyroblastic texture, lithologic units, A3:18-19
porphyroclastic texture
deformation, B11:18-20, 61, 63
lithologic units, B6:3, 8
microscopic vs. macroscopic observations, A3:64-65
porphyroclasts
photomicrograph, A3:190-191, 207
scan, A3:123
potassium
alteration, A3:51
amphibole, B4:11
See also sodium+potassiumhornblende, B10:14
potassium feldspar, alteration, B1:5
potassium oxide
gabbroic rocks, B6:18; B4-14
mica, B9:11
plagioclase, B9:8
veins, B9:15
vs. depth, B6:44
vs. magnesium number, B10:41
preferred orientation, igneous layering, A3:29-30
prehnite
alteration vs. depth, A3:138
chemical composition, B9:53
electron microprobe data, B1:23-24
magmatic structures, A3:60
moderate-temperature minerals, A3:37
veins, A3:44-45; B9:6-7, 12
See also veins
prehnite, vein-forming, X-ray diffraction data, A3:144
pressure-temperature conditions
crystallization, B8:5-14
hydrothermal alteration, B1:5-6
protoliths, lithologic units, B6:3, 8
pumpellyite, vein-forming, X-ray diffraction data, A3:144
pyrite
gabbroic rocks, B7:5-9
low-temperature minerals, A3:38
moderate-temperature minerals, A3:37
pyroxene
composition, B10:36-38
downhole variations, B6:13-14
sulfides, B7:5
See also augite; clinopyroxene; diopside; enstatite; ferrosilite; orthopyroxene
pyrrhotite
gabbroic rocks, B7:5-9
low-temperature minerals, A3:38
moderate-temperature minerals, A3:37
photomicrograph, A3:128; B7:15-16, 23

Q

quartz
alteration vs. depth, A3:138
chemical composition, B9:51
mineral texture, A3:19
moderate-temperature minerals, A3:36
veins, A3:45; B9:3-4, 7-8, 11-12
quartz-microcline, lithologic units, A3:21
quartz-plagioclase, granophyric, lithologic units, A3:21
quench effect, microgabbro, B8:10

R

rare earths
gabbroic rocks, B6:19-20
vs. depth, A3:53, 178
rare earths, chondrite-normalized, gabbroic rocks, B6:59
reaction textures, lithologic units, A3:21
recrystallization
downhole distribution, A3:33-34
gabbro, A1:14-16; B6:6-7
lithologic units, A3:19
microstructures, A3:63-64
photomicrograph, A3:207
remanent magnetization, natural
average declination, A3:216
gabbro, A1:22-23; A3:71-77
logarithm distribution, A3:219
vs. depth, A3:218
remanent magnetization, thermal, vs. depth, A1:67
resistivity
electrofacies, A3:246-251, 313
igneous rocks, A3:81
resistivity logs
Site 735, A3:90-92
vs. depth, A3:234-235
retrograde foliation. See foliation, retrograde
reverse faults, photograph, A1:66
rifting
cross sections, A1:49-50
lower oceanic crust, B(synthesis):18-23; B9:22
rock textures, lithologic units, A3:18-19
rubidium
alteration, A3:51
gabbroic rocks, B6:16; B8:4-14

S

samarium
gabbroic rocks, B6:19
vs. depth, B6:57
saponite, chemical composition, B1:10
saponite, vein-forming, X-ray diffraction data, A3:163
scandium
gabbro, B3:3-5; B8:4-14; B12:4
vs. aluminum oxide, B8:23
vs. calcium oxide, B8:23
vs. calcium oxide/aluminum oxide ratio, B8:23
vs. clinopyroxene number, B8:23
vs. nickel, B3:11
vs. sodium number, B3:11
vs. strontium, B3:11
vs. titanium oxide, B12:12
See also vanadium/scandium ratio
scolecite, vein-forming, X-ray diffraction data, A3:145
sea-floor spreading, magmatic-hydrothermal transition, B4:1-56
secondary minerals
alteration, A3:34-38
vs. depth, A1:57
seismic Layer 3, structure, A1:3; B5:3-4
seismic reflection, seismic Layer 3, B5:3-4
seismic reflectors, vertical incidence profiles, A1:25
seismic thickness, crust, A1:8
selvage, orthopyroxene, B10:13-14
semi-brittle deformation, magmatic structures, A3:61
semi-brittle microstructures, photomicrograph, A3:190-191
serpentine
alteration, B1:4-5
chemical composition, B1:10
octahedral cation total vs. interlayer cations, B1:12
shear wave velocity
caliper logs, B5:41
crust, B5:8
data summary, B5:42-69
downhole measurements, B5:10-12
igneous rocks, B2:2-4, 7-11, 19
oceanic crust, B5:14-15
synthetic seismograms, B5:34-35
vs. bulk density, B5:29
vs. compressional wave velocity, B2:14
vs. depth, B5:27
vs. porosity, B5:28
shear zones
alteration, A3:38
discontinuities, B10:18-21
igneous contacts, A3:55-58
magnetic susceptibility, B11:53
magnetite, A3:23
oceanic crust, B5:14-15; B8:12; B9:21-22
photograph, A3:187
photomicrograph, A3:190-191
shear zones, retrograde, gabbro, A1:18-22
shear zones, reverse, photograph, A3:192
sheared contacts, lithologic units, A3:15-16
silica
apatite, B9:13
epidote, B9:12
gabbroic rocks, B6:16; B8:4-14
magmatic structures, A3:60
mica, B9:11
natrolite, B9:13
thomsonite, B9:13
veins, B9:15
vs. depth, B(synthesis):60; B6:34
vs. gabbro magnetic susceptibility, B11:20
vs. liquidus temperature, B8:21
silicate melts, high-temperature microscopic veins, B4:12-13
silicates
mineral chemistry, B10:1-60
modal composition, A3:17-18
See also calc-silicates
silicates, mafic, mineral chemistry, B10:15
silicon
gabbroic rocks, B8:3-4
veins, B9:16, 33-34
vs. iron ratio, B4:20, 42
Site 735, A1:1-26; A3:1-314
coring summary, A3:252-253
downhole measurements, A1:25-26; A3:81-96
fluid flow, B4:1-56
geochemistry, A1:16-18; A3:21-22, 47-55; B3:1-13; B12:1-18
igneous petrology, A1:11-14; A3:12-33
lithology, B6:1-82
magnetic susceptibility, B11:1-69
metamorphic petrology, A1:14-16; A3:33-47
mineral chemistry, B8:1-60
narrative history, B(narrative):1-20
operations, A3:1-11, 254-255
paleomagnetism, A1:22-23; A3:69-77
physical properties, A1:24-25; A3:77-81; B2:1-19
silicates, B10:1-60
site description, A1:1-26; A3:1-255
structural geology, A1:18-22; A3:54-69
sulfides, B7:1-29
veins, B9:1-66
Skaergaard Intrusion, petrology, B10:26
slickensides, magmatic structures, A3:60
smectite
alteration, A1:16; A3:138; B1:4-5; B6:3-7
alteration vs. depth, A3:139, 141
chemical composition, B1:10
interlayer cation contents, B1:11
low-temperature minerals, A3:37
octahedral cation total vs. interlayer cations, B1:12
photograph, A3:146
photomicrograph, B9:66
veins, A3:44; B9:6-7, 14
See also chlorite/smectite composition; veins
smectite, secondary, vs. depth, A3:135
smectite, vein-forming, X-ray diffraction data, A3:144, 163
sodium
amphibole, B4:11
clinopyroxene, B10:12
gabbroic rocks, B8:3-4
orthopyroxene, B10:14
veins, B9:34-35
sodium+potassium, vs. aluminum, B4:11, 20, 37, 41
sodium number
igneous rocks, B3:3-5
vs. calcium number, B3:8
vs. depth, B3:9
vs. magnesium number, B3:8
vs. scandium, B3:11
vs. titanium oxide, B3:10
vs. vanadium/scandium ratio, B3:10
sodium oxide
apatite, B9:13
gabbroic rocks, B6:18; B8:4-14
igneous rocks, A1:17-18
natrolite, B9:13
thomsonite, B9:13
vs. depth, B6:43
vs. magnesium number, B10:39, 41
See also calcium oxide/sodium oxide ratio
solid solution, melts, B8:8-9
sonic logs, A3:89
sphalerite, gabbroic rocks, B7:5-7
spinel. See chrome-spinel; ulvospinel
spreading ridges
lower oceanic crust, B(synthesis):18-22, 25-26; B10:25-27
magma chambers, B(synthesis):4-6
shear zones, A1:5
structure, B(narrative):9-11
stratigraphy, intrusions, B10:20-21
stress, microstructures, A3:64
strontium
gabbro, A3:51; B3:4; B6:19; B8:4-14
veins, B9:16
vs. aluminum oxide/magnesium oxide ratio, A3:51, 173
vs. clinopyroxene number, B8:26
vs. depth, B6:56; B8:12-13, 27, 29-30
vs. magnesium number, B8:26
vs. scandium, B3:11
strontium/aluminum ratio, vs. anorthite/(anorthite+albite) ratio, A3:51, 174
strontium isotopes, phyllosilicates, B1:6
structural geology, Site 735, A1:18-22; A3:54-69
structures
gabbro, B(synthesis):25-26; B11:28-29
spreadsheets, A1:39-43
stereoplots, A1:64-65
See also microstructures
subophitic texture, lithologic units, A3:15
sulfides
alteration, B6:4
alteration vs. depth, A3:138
gabbroic rocks, B7:1-29
low-temperature minerals, A3:38
mineral chemistry, B7:4-9, 26
mineral inclusions, A3:21
modal composition, A3:18
moderate-temperature minerals, A3:37
olivine gabbro, B4:6-7
petrography, B7:4-7, 24-25
photomicrograph, A3:128
thin sections, A3:23-28
vs. gabbro magnetic susceptibility, B11:20-29
See also chalcopyrite; marcasite; pentlandite; pyrite; pyrrhotite
sulfur
gabbroic rocks, B6:18
vs. depth, B(synthesis):64; B6:48
sutured contacts, lithologic units, A3:15-16
symplectite, photomicrograph, A3:129
synthetic seismograms
core-log integration, B5:12-13
depth vs. time, B5:34-35
well-logs, B5:38

T

talc
alteration, B1:4-5; B6:9
alteration vs. depth, A3:139
chemical composition, B1:10
high-temperature minerals, A3:35
lithologic units, B6:3
octahedral cation total vs. interlayer cations, B1:12
tectonic contacts
lithologic units, A3:15-16
magmatic structures, A3:56
tectonic controls, late-stage melt migration, B10:22
tectonics
cross sections, A1:49-50
transform faults, A1:6-8
temperature
crystallization, B4:11-12, 38, 56
logging, A3:88
for pyroxenes and amphibole-plagioclase, B4:38
veins, B9:17-19, 37
vs. depth, B4:22
vs. magnesium number, B8:19
textures
gabbro, A3:109
lithologic units, A3:18-21; B6:7-14
microstructures, A3:63
photomicrograph, A3:205-207
See also chadacrysts; crescumulate texture; exsolution textures; intergranular textures; intergrowths; mineral textures; mylonitic texture; myrmekitic texture; oikocrysts; ophitic texture; poikilitic texture; porphyroblastic texture; porphyroclastic texture; reaction textures; subophitic texture; ultramylonitic texture
textures, high-temperature, petrography, B4:6-9
thermal boundary layer, lower crust, B8:8
thermal conductivity
igneous rocks, A3:80, 303-306
vs. depth, A3:230
tholeiite, gabbroic rocks, B8:5-14
thompsonite, alteration, B1:5
thomsonite, veins, B9:13
titanite
chemical composition, B9:57
mineral texture, A3:19
moderate-temperature minerals, A3:36
photograph, A3:153
thin sections, A3:24-25
veins, B9:14
titanium
clinopyroxene, B4:10; B10:12
gabbroic rocks, B8:3-4
high-temperature microscopic veins, B4:12-13
hornblende, B10:14
hydrothermal alteration, A3:25-26
orthopyroxene, B10:14
vs. aluminum, B4:37
See also gabbro
titanium/zirconium ratio, olivine gabbro, B3:5
titanium oxide
amphibole, B9:9-10
biotite, B9:11
chemical stratigraphy, A3:51-53; B(synthesis):16, 34-45
clinopyroxene, B4:10
differentiation, B10:16-21
diopside, B9:10
gabbro, A3:53; B3:3-4; B8:4-14; B12:3-4
hornblende, B10:14
igneous rocks, A1:17-18
ilmenite, B9:13
mica, B9:11
orthopyroxene, B4:10
phlogopite, B9:11
veins, B9:15; B11:15
vs. aluminum oxide, B4:34-35
vs. anorthite/(anorthite+albite) ratio, A3:49, 167
vs. calcium number, A3:21, 121
vs. calcium oxide, B4:35
vs. clinopyroxene number, B8:25
vs. depth, A3:52, 177; B(synthesis):51, 60; B6:36; B8:12-13, 27, 29-30
vs. gabbro magnetic susceptibility, B11:20, 21, 26-27, 29
vs. iron oxide, B12:9
vs. liquidus temperature, B8:21
vs. magnesium number, B4:34; B8:25; B10:39, 41; B11:64
vs. magnetic susceptibility, B11:65
vs. modal oxide abundance, A3:21
vs. nickel, B12:10
vs. oxides, A3:119
vs. scandium, B12:12
vs. sodium number, B3:10
vs. vanadium, A3:50, 171-172; B12:11
vs. zirconium, B3:7
See also iron oxide/titanium oxide ratio
titanium oxide, log weight percent, vs. depth, A1:63
titanophile elements
ferrogabbro, B12:13
See also vanadium; yttrium; zirconium
tonalite
petrology, A1:13-14
veins, B8:9-10
trace elements
gabbroic rocks, B3:1-13; B6:18-19, 81; B8:3-5, 54-59; B12:1-18
igneous rocks, A1:17-18
veins, B9:60-61
vs. depth, A3:53, 178
transform faults
structure, B(narrative):9-11
tectonics, A1:6-8
tremolite, geochemistry, B4:20
troctolite
abundance and composition, A3:256-259
chemical composition, A1:70; B3:2-13; B8:13-14
chemical stratigraphy, B(synthesis):38-45
clinopyroxene, B10:11-12
lithologic units, A3:13-14; B(synthesis):11; B6:5, 9-10
magnetic susceptibility, B11:8, 15, 29, 52
petrology, A1:12-14
photograph, A1:56
photomicrograph, A3:127, 129
plagioclase, B10:9-11
shear zones, A1:4-5, 8-10
See also gabbro; microgabbro; oxide troctolite
troilite
gabbroic rocks, B7:5-9
photomicrograph, B7:15-16
trondhjemite
age, A1:7-8
petrology, A1:13-14
veins, B8:9-10
See also gabbro

U

ultramylonite, magnetic susceptibility, B11:18-20, 63
ultramylonitic texture, photomicrograph, A3:207
ulvospinel, thin sections, A3:24-25
uplifts
cross sections, A1:49-50
lower oceanic crust, B(synthesis):20-22; B9:22
oceanic crust, B1:1-24

V

vanadium
ferrogabbro, B12:13
gabbroic rocks, B6:18-19; B8:4-14; B12:4-5, 14
vs. clinopyroxene number, B8:25
vs. depth, B6:49
vs. magnesium number, B8:25
vs. titanium oxide, A3:50, 171-172; B12:11
vanadium/scandium ratio
gabbro, B3:3-5
vs. sodium number, B3:10
vein abundance, vs. hydrothermal alteration, A3:137
vein intensity, vs. depth, A1:64; A3:200
vein nets, magnetic susceptibility, B11:15-16, 55
vein number
vs. depth, B11:59
vs. magnetic susceptibility, B11:57
veins
abundance as volume percent of core, B1:9
alteration, B1:3-6; B6:6
amphibole, A1:15
dip, A3:244
dip vs. depth, A3:201-203
geochemistry, B9:60-61
isotopes, B1:14
mineral texture, A3:19
orientation, A3:61
origin and models, B9:19-22
petrography, B9:3-8
spreadsheets, A1:38
temperature, B9:17-19
types, A3:267; B9:27, 38
vs. depth, A1:58; A3:149; B9:28
X-ray diffraction data, A3:144-145
zeolite and prehnite, A1:16
veins, amphibole
abundance as volume percent of core, B1:9
chemical composition, B9:43
crystal-plastic deformation, A3:67, 212
dip vs. depth, A3:201
petrography, B9:4-5
photograph, A1:60; A3:158-161, 164, 189
photomicrograph, A3:194
proportion vs. total veins, A3:150
Site 735, A3:43
vs. depth, A1:58; A3:149, 211
veins, breccia, magnetic susceptibility, B11:15-16
veins, calcite, A3:43
veins, carbonate
abundance as volume percent of core, B1:9
dip vs. depth, A3:202
petrography, B9:7
petrology, A3:43; B1:4
photograph, A3:162
proportion vs. total veins, A3:150
vs. depth, A1:58; B9:28
veins, chlorite
abundance as volume percent of core, B1:9
petrography, B9:7-8
photograph, A3:164
vs. depth, A1:58; A3:149; B9:28
veins, chlorite/smectite
abundance as volume percent of core, B1:9
petrology, B1:4
veins, diopside
petrography, B9:6
proportion vs. total veins, A3:150
titanite photograph, A3:153
vs. depth, A3:149; B9:28
veins, diopside + amphibole, A3:42-43
veins, dioritic, photograph, A3:154
veins, epidote
petrography, B9:7-8
photograph, A3:165
veins, felsic
alteration photograph, A3:151-152
chemical composition, B8:13-14; B9:33
deformation, B11:18-20
gabbroic rocks, B8:7
intensity vs. depth, A3:131
lithologic units, A3:21, 28-29, 41-42; B(synthesis):10-11
magmatic structures, A3:59
magnetic susceptibility, A3:226; B11:11-15, 48, 50-51
origin, B8:9-10
petrography, B9:3-4
photograph, A1:59; A3:132
photomicrograph, A3:194; B9:62-63
plagioclase, B10:9-11
proportion vs. total veins, A3:150
relationship to oxide gabbro, B11:17
vs. depth, A3:149; B9:28
zoning photograph, A3:152
veins, high-temperature microscopic
occurrence, B4:25, 43-44
origin, B4:12-13
petrography, B4:6-9
photomicrograph, B4:28-30, 39-40
vs. depth, B4:22
veins, hydrothermal, alteration, A3:41-45
veins, igneous and hydrothermal, composition and origin, B9:1-66
veins, magmatic
alteration, A3:41-45
dip vs. depth, A3:201
veins, olivine gabbro, photograph, A1:54
veins, plagioclase
composition, A3:42; B9:35-36
petrography, B9:3-4
proportion vs. total veins, A3:150
vs. depth, A3:149
veins, plagioclase + amphibole
formation, A3:42; B9:18-19, 37
petrography, B9:5
photograph, A3:155-156
photomicrograph, B9:62-64
proportion vs. total veins, A3:150
vs. depth, A1:58; A3:149; B9:28
veins, plagioclase + diopside
chemical composition, B9:34
petrography, B9:6, 18-19
photograph, A1:59; A3:157
photomicrograph, B9:62, 64
Site 735, A3:42-43
vs. depth, A1:58; B9:28
veins, plagioclase + quartz, photomicrograph, B9:62
veins, prehnite, petrology, A3:44-45; B1:4
veins, quartz, petrography, B9:7-8
veins, smectite
abundance as volume percent of core, B1:9
dip vs. depth, A3:202
petrology, A3:44; B1:4
photograph, A1:61; A3:146, 160, 164
proportion vs. total veins, A3:150
vs. depth, A1:58; A3:149; B9:28
veins, smectite + prehnite + carbonate, petrography, B9:6-7
veins, zeolite
dip vs. depth, A3:202
petrology, A3:44-45; B1:4
vs. depth, A1:58; A3:149; B9:28
veins, zeolite + prehnite, abundance as volume percent of core, B1:9
veins, zeolite + prehnite + carbonate, petrography, B9:7
velocity
attenuation, B2:3-4, 15-17
oceanic crust, B5:14-15
structure, A1:51
vs. depth, A1:69
See also anisotropy; attenuation; compressional wave velocity; shear wave velocity
velocity logs
Site 735, A3:84-87
vs. depth, A3:236; B5:26
velocity structure, lower oceanic crust, B5:1-71
vertical incidence profiles, seismic reflectors, A1:25
volatiles, chemical composition, A3:281
vugs, photograph, A3:162

W

water content
gabbroic rocks, B6:18
volatiles, A3:281
vs. depth, B6:46
well-logs
compressional wave velocity, B5:36-37
fractures, A3:245
synthetic seismograms, B5:38
See also core-log integration
wollastonite
chemical composition, B4:9-10
gabbro, B10:13-14

X

X-ray diffraction data, modal composition, B6:62-63
xenoliths, core photograph, A3:195

Y

ytterbium
vs. lanthanum/ytterbium ratio, B6:60
See also lanthanum/ytterbium ratio
yttrium
ferrogabbro, B12:13
gabbro, A3:50; B8:4-14; B12:4, 14
gabbroic rocks, B6:19
veins, B9:16
vs. clinopyroxene number, B8:26
vs. depth, A3:53, 178; B(synthesis):62; B6:54; B8:12-13, 27, 29-30
vs. magnesium number, B8:26

Z

zeolites
alteration vs. depth, A3:138
chemical composition, B9:55
electron microprobe data, B1:23-24
moderate-temperature minerals, A3:37
veins, A3:44-45; B9:13
See also veins
zeolites, vein-forming, X-ray diffraction data, A3:145
zinc
gabbroic rocks, B6:19; B8:4-14
sulfides, B7:6-9
veins, B9:16
vs. depth, B6:52; B8:12-13, 27, 29-30
vs. iron oxide, A3:49, 170
zircon
chemical composition, B9:56
veins, B9:13-14
zirconium
ferrogabbro, B12:13
gabbro, A3:50; B3:4-5; B6:19; B8:4-14; B12:4-5, 14
veins, B9:16; B11:15
vs. clinopyroxene number, B8:26
vs. depth, B(synthesis):63; B6:55; B8:12-13, 27, 29-30
vs. magnesium number, B8:26
vs. niobium, B3:7
vs. titanium oxide, B3:7
See also titanium/zirconium ratio
zirconium/niobium ratio, gabbro, B3:5
Zone 3a, olivine gabbro, B(synthesis):41-42
Zone 3b, olivine gabbro, B(synthesis):42-43
Zone 3c, olivine gabbro, B(synthesis):43
zoning
chemical stratigraphy, B(synthesis):17
clinopyroxene, B10:12
plagioclase, B9:17; B10:10