SUBJECT INDEX

A

accretion crust, A1:6–12 seafloor spreading, B1:30
aerobiology, dust-borne microorganisms, B1:18
agate, photomicrograph, A5:117
albite hydrothermal alteration, A5:15 photomicrograph, A5:84
alpha-serpentine, photomicrograph, A7:61
alteration dunites, A7:6 gabbros and gabbronorites, A3:8–9 geochemistry, A3:36–37; A6:31 harzburgites, A3:6 intensity vs. depth, A5:81, 94; A6:62, 66; A9:63; A10:79, 96 iron oxyhydroxides, A8:2–3 lithologic units, A5:5–9; A6:3–18; A9:5–7 mafic rocks, A3:12–13 microprobe data, B2:1–13 mylonitic shear zones, A3:11–12 photograph, A9:60–61; A10:90 photomicrograph, A3:60–67, 69–71, 74–75, 77–82, 86; A5:57–58; A6:56–61, 67–70; A9:61–62; A10:64–65 timing of events, A3:96; A5:20 ultramafics, A3:11 veins, A3:27–28 vs. deformation timing, A5:103 See also hydrothermal alteration; weathering; weathering rinds
alteration, synkinematic, photograph, A5:123
alteration fronts, photograph, A3:95; A5:86
alteration halos hydrothermal alteration, A10:15–17 intensity vs. depth, A9:63 photograph, A5:86; A7:67, 83 photomicrograph, A3:82
alteration halos, orange–brown, photograph, A9:64
alteration halos, oxidized, carbonate veins, A9:10–11
alteration rinds, photomicrograph, A10:103
aluminum. See chromium/aluminum ratio; chromium/(chromium + aluminum) ratio
aluminum oxide alteration, A3:36 diabase and basalt, A7:23 gabbroic rocks, A10:24–25 gabbros, A6:30 igneous rocks, A5:35; A10:26–27 peridotites, A3:34; A6:28; A7:21; A9:18–20 troctolites, A10:23 vs. calcium oxide, A5:149; A9:86 vs. chromium, A6:104, 107; A7:95; A10:118 vs. chromium oxide, B2:6, 8, 9 vs. magnesium number, B2:6, 8 vs. magnesium oxide, A6:102, 107; A7:97; A10:119 vs. scandium, A6:105, 107; A7:96; A10:122 vs. silica, A5:154; A10:114 vs. strontium, A5:151 vs. titanium oxide, A6:105; A7:96; A9:88; A10:118 vs. trace elements, A3:139; A9:87 vs. trace elements in peridotites, A5:152–153 vs. vanadium, A6:104, 107; A7:96; A10:118 vs. zirconium, A6:105; A7:96; A9:88; A10:118
aluminum oxide/silica ratio, vs. magnesium oxide/silica ratio, A9:20, 89
amphibole altered gabbros, A5:82 composition, B4:22 deformation, A6:20 hydrothermal alteration, A5:12–20; A6:10–14; A10:12–15 mineral chemistry, B4:5 mylonites, A3:12 photograph, A3:85, 87; A6:55, 82; A10:56 photomicrograph, A1:114–115; A3:82, 88; A5:59, 71, 76–77, 83–85, 90, 138; A6:58–61, 67–68, 72–74, 76, 84–87, 94; A10:78 shear zones, A6:23–24 veins, A5:87; A6:65, 71 See also hornblende; olivine–amphibole–talc assemblage
amphibole, acicular, photograph, A10:80
amphibole, brown hydrothermal alteration, B4:4 lithologic units, A6:3–10 photomicrograph, A5:84–85; A7:67; A10:81
amphibole, cross-fiber secondary, photomicrograph, A6:86
amphibole, euhedral brown, photomicrograph, A6:61
amphibole, feathery green, photomicrograph, A10:82
amphibole, fibrous, photomicrograph, A6:73; A10:105
amphibole, green, photomicrograph, A10:91–92
amphibole, interstitial, photomicrograph, A6:74
amphibole, near-static secondary, photomicrograph, A6:86
amphibole, schistose, shear zones, A6:23–24
amphibole, secondary, photomicrograph, A6:84–85
amphibole, secondary fibrous green, photomicrograph, A7:67; A10:81
amphibolite alteration, A3:13 photomicrograph, A6:48–49, 57, 60
amphibolite facies deformation, A6:20 deformation vs. alteration, A5:103 shear zones, A6:23–24
anisotropy anhysteretic remanent magnetization, A9:24–25, 98, 111 magnetic susceptibility, A3:44, 165; A5:45, 186; A6:35, 128; A7:31, 133; A9:24–25, 98, 110; A10:35, 140, 165–166 See also thermal conductivity anisotropy
anisotropy, apparent compressional wave velocity, A7:101 thermal conductivity, A6:111; A7:104
anorthite vs. forsterite, B1:28 X-ray diffraction data, A10:80
antigorite, hydrothermal alteration, A5:12
apatite lithologic units, A7:4 mylonites, A3:12 photomicrograph, A10:76
aragonite genesis, A5:20 veins, A9:68 X-ray diffraction data, A7:63
augen deformation, A6:20 photomicrograph, A5:113; A6:86
awaruite, iron–nickel–sulfur–oxygen system phase equilibria, A3:97
azimuth, vs. depth, A10:149

B

bacteria aerobiology, B1:18 bottom water, A3:170
banded contacts, lithologic units, A10:4–10
banding deformation, A6:20 dunites, A3:7 dunites and harzburgites, A3:28 lithologic units, A5:4 orthopyroxene, A3:7–8 orthopyroxenite, A3:7–8 photograph, A3:128–129; A5:116, 136; A7:45, 77 photomicrograph, A5:58, 85, 91, 118; A6:73–74, 85 stereo plots, A5:120
barium diabase and basalt, A7:24 gabbroic rocks, A10:25 gabbros, A6:30 igneous rocks, A10:27 mafic rocks, A7:25 vs. carbon dioxide, A1:125
basalts alteration, A7:9–10 geochemistry, A7:97–100 geology, A1:78–79 petrology, A8:2–3
basalts, aphyric, lithologic units, A3:4
basalts, vesicular photograph, A1:96 photomicrograph, A4:10–11
bastite hydrothermal alteration, A5:12; B4:3–4 photomicrograph, A3:60, 77, 99; A5:57, 105; A7:61, 82; A9:61 ultramafics, A3:11
bastite, protogranular orthopyroxene, photomicrograph, A5:130
bastite, serpentine, photomicrograph, A3:99–100
bathymetry Mid-Atlantic Ridge, A1:78–79; B1:25; B3:7; B4:10 Site 1268, A3:53–56 Site 1269, A4:7–9 Site 1270, A5:50–52 Site 1271, A6:41–43 Site 1272, A7:39–41 Site 1273, A8:5–7 Site 1274, A9:32–34 Site 1275, A10:45–47
biotite, photomicrograph, A3:82; A7:67
borehole azimuth logs, vs. depth, A7:113
borehole deviation logs, vs. depth, A7:113; A10:149
boudinage brown amphibole veins, A5:19–20 hydrothermal alteration, A5:14 photograph, A5:96 photomicrograph, A5:63, 138 See also microboudins
Bouguer anomalies, fracture zones, A1:80
boundary layers, conductive, mantle, B1:1–33
breccia alteration, A8:2–3 hydrothermal alteration, A5:12 igneous rocks, A3:25–26 rubble zone, A7:12 semibrittle shear zones, A6:24–25 serpentine, A5:22–23 See also fault breccia
breccia, carbonate-cemented, photograph, A7:73
breccia, intrusion lithologic units, A3:4 photograph, A3:70, 83, 107
breccia, serpentine mud photograph, A9:65 X-ray diffraction data, A9:65
breccia, stockwork, intrusions, A3:10
brecciation deformation, A5:27 photomicrograph, A5:122
brucite hydrothermal alteration, A6:11–14; A9:8–11 hydrothermal reactions, A9:11 magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 photograph, A9:60 photomicrograph, A9:601–62 silica metasomatism, A3:18–20 X-ray diffraction data, A6:64; A7:60, 65; A9:60 See also serpentine–brucite assemblage
brucite kernels, hydrothermal alteration, A9:8–11
bulk density logs, vs. depth, A7:34, 112; A10:148

C

calcite, photomicrograph, A10:95
calcium. See also magnesium–calcium–silicon–oxygen–hydrogen system
calcium/chloride ratio, alteration, A3:36
calcium oxide gabbros, A3:35; A6:30 hydrothermal alteration, B1:9 igneous rocks, A5:35, 37–38 peridotites, A6:29; A7:21; A9:18–20 troctolites, A10:23 vs. aluminum oxide, A5:149; A9:86 vs. carbon dioxide, A1:124; A5:150; A7:94; A10:115 vs. magnesium oxide, A7:97
caliper logs summary, A7:127 vs. depth, A7:112–113; A10:147 See also Hostile Environment Litho-Density Sonde caliper logs
carbon, peridotites, A6:28
carbon dioxide gabbroic rocks, A10:24 igneous rocks, A5:35 peridotites, A3:34; A6:29; A7:21 troctolites, A10:23 vs. barium, A1:125 vs. calcium oxide, A1:124; A5:150; A7:94; A10:115 vs. strontium, A1:125
carbonates igneous rocks, A5:35 photograph, A6:93; A9:64; A10:90 photomicrograph, A10:84 veins, A6:65, 71
cataclasites deformation, A10:18–19 intensity vs. depth, A7:84 See also protocataclasite
cataclasites, gabbro, photomicrograph, A10:103
cataclasites, green amphibole photograph, A10:101 photomicrograph, A10:102
cataclastic regions intensity and orientation, A5:31 orientation, A3:31–32 photograph, A3:114 vs. depth, A5:124, 140
cerium. See lead/cerium ratio
chalcopyrite hydrothermal alteration, A5:13; B1:10 igneous rocks, B3:4 photograph, A5:88, 101 vs. depth, B3:10
chloride vs. magnesium oxide, B2:6, 8, 9 See also calcium/chloride ratio
chlorite alteration, A8:3 altered gabbros, A5:82, 84 deformation, A6:20 hydrothermal alteration, A5:12; A6:10; A10:12–15 mylonites, A3:12 photograph, A3:85, 87; A5:123; A6:51 photomicrograph, A3:86, 89; A5:85; A6:67–68, 73–74, 76; A10:85, 93–94 veins, A5:87 volume percentage in veins, A3:92 See also hydroxychlorite
chlorite, schistose, photograph, A6:95
chlorite/smectite hydrothermal alteration, A10:14–17 photomicrograph, A7:66, 68; A10:91
chromite hydrothermal alteration, A6:10 photomicrograph, A6:53
chromitite lithologic units, A6:8 mid-ocean ridges, A1:35–36 photograph, A6:51 photomicrograph, A6:52–53, 81
chromitite, podiform lithologic units, A6:8 photograph, A1:112
chromium diabase and basalt, A7:23 gabbroic rocks, A10:24–25 gabbros, A3:35–36; A6:30 igneous rocks, A5:36; A10:26 peridotites, A3:34; A6:29; A7:22 troctolites, A10:23 vs. aluminum oxide, A5:153; A6:104, 107; A7:95; A9:87; A10:118 vs. magnesium number, A10:117 vs. magnesium oxide, A7:99 vs. silica, A3:140; A5:156
chromium/aluminum ratio, hydrothermal alteration, B1:10
chromium/(chromium + aluminum) ratio, mantle sources, A1:81
chromium number spinel, B4:4, 6 vs. depth, B4:5, 19–20 vs. forsterite, B4:17 vs. magnesium number, B2:7; B4:14 vs. titanium oxide, B4:15
chromium oxide amphibole, spinel, B4:5 vs. aluminum oxide, B2:6, 8, 9 vs. nickel oxide, B2:6, 8
chrysotile magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 photomicrograph, A3:74 vs. depth, A9:68 X-ray diffraction data, A6:64; A7:60, 63, 65; A9:60, 65 See also clinochrysotile
clasts hydrothermal alteration, A6:10 lithologic units, A3:4 photomicrograph, A6:97; A10:93 semibrittle shear zones, A6:24–25
clasts, fractured amphibole, photomicrograph, A10:102
clasts, lithic, photograph, A5:108
clasts, matrix-supported, photograph, A7:87
clasts, resistive, Formation MicroScanner imagery, A7:90
clasts, ultramafic, photograph, A3:70, 83, 107
clasts, weathered, photograph, A7:72
clays alteration, A8:2–3 alteration of harzburgites, A7:8–9 carbonate veins, A9:10–11 hydrothermal alteration, A5:12; A6:14; A7:9–10 photograph, A5:95; A9:64 photomicrograph, A5:89; A10:94
cleavage, brown amphibole veins, A5:19–20
cleavage planes, photomicrograph, A3:61
clinochrysotile, X-ray diffraction data, A9:65
clinopyroxene gabbros, A3:8–9 grain size, A9:51 harzburgites, A3:6 hydrothermal alteration, A6:10–11; A9:7–11 lithologic units, A5:4–8; A6:3–10; A9:2–7; A10:7–10 microprobe data, B2:1–13 orthopyroxenite, A3:7–8 photograph, A3:85; A6:55; A7:55 photomicrograph, A3:64–66, 69, 86, 88, 106; A5:58, 64, 66, 75, 91, 112–114, 117–118; A6:84; A7:54, 57, 82; A9:44–50, 55, 70; A10:63–65, 75–77, 91–92; B1:27 quenching, A4:3 X-ray diffraction data, A10:80
clinopyroxene, euhedral, photomicrograph, A5:62; A9:50
clinopyroxene, intergranular, photomicrograph, A7:57
clinopyroxene, interstitial lithologic units, A9:7 residual peridotites, B1:7–8
clinopyroxene, ophitic lithologic units, A6:7 photomicrograph, A6:61
clinopyroxene, poikilitic, photomicrograph, A6:59; A9:45
clinopyroxene, quench petrology, A8:2 photomicrograph, A4:11
clinopyroxene, recrystallized, photograph, A3:105
clinopyroxene, subophitic, lithologic units, A7:4
clinopyroxene augen, photomicrograph, A6:86
clinopyroxene microphenocrysts, hydrothermal alteration, A10:12–15
clinozoisite, calcium metasomatism, A3:20
cobalt igneous rocks, A5:36 peridotites, A9:18–19 sulfides, B3:4
cobbles, lithologic units, A7:2–3
compressional wave velocity average values in peridotites and gabbros, A3:148 igneous rocks, A3:38–41 vs. bulk density, A10:133 vs. depth, A3:142; A7:101; A9:90; A10:125–126 vs. wet bulk density, A3:147; A5:163; A6:112; A7:106; A9:95
compressional wave velocity apparent anisotropy igneous rocks, A7:101 vs. depth, A3:142; A9:90; A10:125–126
compressional wave velocity logs, vs. depth, A10:148
contamination, peridotites, B5:6–10
core–log correlation, fault zones, A7:18–19
core logs, B1:26
cores, length, A1:128
cracks photomicrograph, A10:82 weathering stains, A7:12 See also microcracks
crenulate contacts, lithologic units, A10:4–10
crust accretion, A1:6–12 focused accretion, A1:8
crystal fractionation, mafic rocks, A7:25
crystal habit, hopperlike, photomicrograph, A7:48
crystallization gabbroic rocks, B1:15 troctolites, A10:9–10 See also crystal fractionation; fractional crystallization
culture experiments electron donors, B5:25 See also microbial enrichment cultures

D

deep resistivity logs, vs. depth, A10:147
deformation brown amphibole veins, A5:19–20 evolution, A7:19–20 gabbros, A5:123 harzburgites, A7:13 intensity in harzburgites, A7:14–15 lithologic units, A5:5–9; A9:3–7 paleomagnetism, B1:13 photograph, A3:107, 130; A5:85 photomicrograph, A1:99–100; A3:60, 64; A5:62–66, 85, 130–131, 139; A6:72–76 serpentinization, A5:18–19 timing, A5:20 vs. alteration timing, A5:103
deformation, brittle breccia, A5:22–23, 30–31 dip vs. expanded depth, A5:141 distribution and orientation, A10:20 gabbroic rocks, A10:18 igneous rocks, A3:24–27 intensity vs. depth, A6:25, 98–99; A9:16–17, 72; A10:106, 108 photomicrograph, A5:121 serpentinized harzburgites, A7:15–20
deformation, brittle–ductile photomicrograph, A6:87 serpentinized harzburgites, A7:15–20
deformation, cataclastic, photograph, A3:120
deformation, crystal-plastic distribution and total intensity, A6:21 distribution by intensity grade, A6:80 gabbroic rocks, A10:18 gabbronorites, A1:102 intensity, A3:20–21, 23–24, 158; A9:105 intensity and orientation vs. depth, A3:98; A5:21–26, 28 intensity histograms, A10:100 intensity in cores, A5:111 intensity vs. depth, A3:112; A5:106, 119, 124, 128–129, 140; A6:79; A7:79; A9:72; A10:99 intensity vs. recovery, A7:81; A9:73 mylonites, A3:12 photograph, A3:129; A6:82 proportion in cores, A3:103 serpentine, A5:21–22 structures, B1:11–15 textures, A6:18–19 timing, A3:30
deformation, ductile hydrothermal alteration, A6:16 photomicrograph, A1:114–115; A5:122; A6:72
deformation, high-strain crystal-plastic, structures, A9:12
deformation, high-temperature, photomicrograph, A3:100; A9:70
deformation, high-temperature brittle, neoblasts, A5:26
deformation, high-temperature ductile, photomicrograph, A6:74
deformation, high-temperature low-strain, igneous rocks, A3:21
deformation, high-temperature low-strain crystal-plastic, structures, A9:12
deformation, late-stage high-temperature mylonitic, localization, A3:29
deformation, low-temperature brittle shear, brecciation, A5:27
deformation, postintrusion crystal-plastic, gabbronorite dikes, A9:14
deformation, semibrittle intensity and orientation, A5:31 vs. depth, A6:25
deformation, subsolidus crystal-plastic, metamorphism, A6:20
deformation textures, photomicrograph, A9:74, 76–77
deformation twins, photomicrograph, A3:100
demagnetization decay curves, A6:115 vector endpoints, A5:164–165, 167; A6:113–114; A7:108–109; A9:97; A10:137–139
demagnetization, alternating-field discrete sample whole-core direction comparison, A3:44–45 ultramafics, A3:150
demagnetization, thermal, ultramafics, A3:150
density discrete samples, A6:125 igneous rocks, A3:38–41, 162; A5:41, 181; A6:33; A7:27–28, 126; A9:22, 108; A10:29–30, 161 vs. hydrothermal alteration, A1:126
density, bulk caliper logs, A7:128 cube samples, A3:163 igneous rocks, A5:182 vs. compressional wave velocity, A9:95; A10:133 vs. depth, A10:125–126 vs. mean magnetic susceptibility, A10:30–31, 134 vs. mean thermal conductivity, A10:132 vs. thermal conductivity, A7:105; A9:94
density, grain, vs. mean magnetic susceptibility, A10:134
density, wet bulk vs. compressional wave velocity, A3:147; A5:163; A6:112; A7:106 vs. depth, A3:142; A7:101; A9:90
density logs igneous rocks, A10:40 See also bulk density logs
diabase deformation, A10:18–19 geochemistry, A1:118; A10:24–25 hydrothermal alteration, A10:12–17 lithologic units, A7:2–7; A10:3–10 petrogenesis, A1:59–61 physical properties, A10:125 thermal conductivity, A7:103
diabase, olivine–plagioclase phyric, lithologic units, A10:7
diabase, phyric photograph, A10:61 photomicrograph, A10:78
diabase, porphyritic, photomicrograph, A10:64
diabase, spherulitic, photomicrograph, A7:48
diabase, undeformed, photograph, A10:104
diabase contacts, stereo plots, A10:112
dikelets melt migration, B4:6 photograph, A6:55; A10:55
dikelets, gabbroic, photomicrograph, A6:76
dikelets, granophyre, photomicrograph, A10:77–78
dikelets, metamorphic, photomicrograph, A5:84
dikes hydrothermal alteration, A6:10–11 lithologic units, A7:2–3
dikes, amphibole ultramafic, photomicrograph, A5:55
dikes, crosscutting, photograph, A10:50
dikes, diabase, lithologic units, A10:4–10
dikes, felsic photograph, A10:84 photomicrograph, A10:84
dikes, gabbroic alteration, A3:12–13 impregnation, A6:21–22 lithologic units, A10:5–10
dikes, magmatic photograph, A3:82 photomicrograph, A3:82
dikes, pyroxenite, photomicrograph, A5:59
dikes, ultramafic, hydrothermal alteration, A5:12
diopside, magnesium–calcium–silicon–oxygen–hydrogen system, A6:77
dip, foliation, A9:13–14
dissolution orthopyroxene, A3:9–10 peridotites, B5:1–38
downhole measurements Site 1268, A3:48 Site 1271, A6:36–37 Site 1272, A7:32–36 Site 1274, A9:27 Site 1275, A10:37–41
dunites alteration, A7:6 altered pyroxene stratigraphic proportion, A3:72 digital images, A6:89 hybridization with gabbroic rocks, B4:1–23 hydrothermal alteration, A5:11–12; A6:10, 16–17 lithologic units, A3:4–5, 7; A5:4–9; A6:3–5; A7:2–7; A9:2–7; A10:4–10 metamorphic veins, A5:16–17 microprobe data, B2:1–13 origin, A1:34–35 petrography, B4:3 photograph, A1:112, 117; A3:59, 128; A6:91; A7:44–45, 77; A9:37, 78–79 photomicrograph, A5:72; A6:46–47, 58, 64, 70, 74–75, 81 proportions, A1:98 spreading centers, B1:4–6 transport, A1:6–12 X-ray diffraction data, A6:63–64
dunites, altered, photograph, A6:45, 51, 63–64
dunites, amphibole-bearing hydrothermal alteration, A6:15–16 photomicrograph, A6:76
dunites, brucite-altered, photograph, A9:60
dunites, chromitiferous, photograph, A6:82
dunites, olivine-bearing, photomicrograph, A6:67
dunites, orthopyroxene-bearing serpentinized, photograph, A3:114
dunites, oxidatively-altered aragonite-veined, photograph, A7:63
dunites, serpentinized, photograph, A6:55

E

elongate minerals, harzburgites, A7:14–15
enstatite, magnesium–calcium–silicon–oxygen–hydrogen system, A6:77
environmentally corrected gamma ray logs, vs. depth, A10:148
exsolution gabbronorites, A10:9 photomicrograph, A9:70; A10:75, 83
exsolution lamellae, photomicrograph, A7:54, 57

F

fabric deformation, A9:12 distribution by lithology, A6:80 gabbronorites, A10:8–9 intensity in gabbronorite, A1:102 pyroxene bastite, A5:104 spinel, A6:22 See also magnetic fabric
fabric, crystal-plastic harzburgites, A7:14–15 intensity and dip, A5:146 intensity and orientation, A5:21–22 photograph, A3:128
fabric, gabbro, orientation, A3:132
fabric, high-temperature high-strain, igneous rocks, A3:22–23
fabric, high-temperature low-strain alteration, A5:24, 28–29 igneous rocks, A3:21
fabric, high-temperature low-strain mantle, textures, A6:19
fabric, high-temperature moderate-strain alteration, A5:24–25, 28–29 igneous rocks, A3:21–22
fabric, magmatic, distribution and orientation, A10:21
fabric, moderate-temperature high-strain, alteration, A5:25
fault breccia hydrothermal alteration, A5:12; A6:14 photograph, A3:58; A5:108; A7:87 photomicrograph, A6:97 recovery and boundaries, A6:78
fault gouge dip, A7:119 foliation, A9:14 Formation MicroScanner imagery, A7:88, 115–116 hydrothermal alteration, A5:12; A9:9 igneous rocks, A3:25–26; A7:17–18 intensity vs. depth, A7:92 lithologic units, A5:4 photograph, A1:120; A3:113; A5:108; A9:39, 82–83 proportions, A1:98 recovery and boundaries, A6:78 semibrittle shear zones, A6:24–25 serpentine, A5:22–23
fault gouge, semiplastic, photograph, A7:87
fault zones brittle and crystal-plastic deformation, A5:147 brittle deformation, A3:30 core–log correlation, A7:18–19 fluid flow, A7:9 Formation MicroScanner imagery, A7:115 hydrothermal alteration, A6:11–14 lithologic units, A7:6–7 orientation, A7:18–19 structures, A9:16
fault zones, brittle, structures, B1:12–15
faults deformation, A6:25–26 dip, A7:119 dip histograms, A3:118 dip vs. depth, A3:119; A10:107 igneous rocks, A3:26 photomicrograph, A6:87 stereo plots, A3:135
faults, brittle, semibrittle shear zones, A6:24–25
faults, normal geology, A1:78–79 photograph, A3:95, 117
felsic material, photograph, A7:49–50
fifteen degrees-twenty seconds Fracture Zone, deformation, A1:1–139
first lead paradox, peridotites, B1:16–18
fluid flow fault zones, A7:9 hydrothermal alteration, A6:11–14 mantle, A6:8
fluid inclusions, photomicrograph, A7:69
fluorescent microspheres, contamination, A3:169
focussing, mantle upwelling, A1:7–8
folds, photomicrograph, A6:73, 96
foliation deformation, A6:20 dip vs. depth, A5:119 gabbros, A10:5 orientation, A3:31 orientation in spinel, A3:132 photograph, A3:104, 129; A5:115–116; A6:82; A9:79 photograph in spinel, A3:133 photomicrograph, A3:106; A5:79, 137–138; A6:86 spinel, A5:32; A6:19
foliation, anastomosing dip histograms, A3:110–111 photograph, A3:108–109 photomicrograph, A5:117
foliation, anastomosing serpentine, igneous rocks, A3:24–25
foliation, chrysotile dip vs. depth, A9:80 stereo plots, A9:81
foliation, cross-fiber anastomosing serpentine, serpentinized harzburgites, A7:15
foliation, cross-fiber serpentine depth vs. intensity, A3:112 dunites, A5:22, 31 dunites and harzburgites, A6:22–23 gabbronorite dikes, A9:14–15
foliation, crystal-plastic dip vs. depth, A3:98 intensity and orientation, A5:21–22 photograph, A3:102, 114, 130; A5:110, 135–136; A7:77 photomicrograph, A6:94 protogranular textures, A9:13–14 stereo plots, A3:134; A5:120; A7:78; A9:75
foliation, harzburgite photograph, A5:134 stereo plots, A5:132
foliation, high-temperature, photograph, A7:46
foliation, high-temperature high-strain, igneous rocks, A3:22–23
foliation, high-temperature low-strain, igneous rocks, A3:21
foliation, low-angle, photograph, A3:101
foliation, magmatic gabbros, A3:9 stereo plots, A10:112–113
foliation, mesoscopic crystal-plastic, photograph, A7:80
foliation, mylonitic, textures, A5:33
foliation, serpentine orientation, A7:19 photograph, A9:78–79 stereo plots, A7:91
foliation, shear, photograph, A10:104
foliation, spinel, stereoplots, A6:83
foliation planes, harzburgites, A7:13
Formation MicroScanner imagery apparent faults, A7:116 fault gouge, A7:88 fault zones, A7:18–19, 35–36, 115 fracture strike, dip azimuth and dip, A7:118 fractures, A7:116 harzburgites, A7:88 oxide gabbros, A7:88 resistive clasts, A7:90 resistivity contrast of fault zones, A7:117 serpentine schists, A7:89 vs. depth, A7:75, 112–113; A10:151–153
Formation MicroScanner imagery logs igneous rocks, A10:41 vs. depth, A10:147
forsterite magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 mineral chemistry, B4:4 molecular percent histogram, B4:13 vs. anorthite, B1:28 vs. chromium number in spinel, B4:17 vs. depth, B4:19
fractional crystallization high pressure, B1:4–6 lithologic units, A10:10 melts, B4:6
fracture zones, deformation, A1:1–139; A9:16–17
fractures deformation, A5:27 dip vs. depth, A10:107 Formation MicroScanner imagery, A7:116, 118; A10:151–153 photograph, A3:130 resistivity-at-the-bit, A10:144 stereo plots, A9:81 See also joints; microfractures; shear fractures
fractures, brittle, orientation, A6:26
fractures, brittle shear, orientation, A7:19
fractures, shear dip histograms, A3:118 dip vs. depth, A3:119 igneous rocks, A3:26 intensity vs. depth, A7:92 stereo plots, A7:91
fugacity hydrothermal alteration, B1:10–11 sulfides, B3:4
fungi, aerobiology, B1:18

G

gabbro/diorite, miarolytic, photograph, A7:67
gabbroic rocks composition, B1:7 digital images, A6:90 geochemistry, A6:29–31 hybridization with dunites, B4:1–23 lithologic units, A7:2–3 mantle, B1:15 microprobe data, A1:1–139; B2:1–13 Mohorovicic discontinuity, B1:15 petrogenesis, A1:59–61 photograph, A3:58; A6:50, 55; A10:53 photomicrograph, A6:61 proportions, A1:98 spreading centers, B1:4–6
gabbroic rocks, impregnated, vs. depth, A6:54, 66
gabbromylonites, photomicrograph, A6:85
gabbromylonites, troctolitic, photograph, A6:82
gabbronorites alteration, A3:12–13 crystal-plastic deformation, A1:102 geochemistry, A10:24–25 lithologic units, A3:5, 8–9; A10:8–9 magnesium oxide, A7:24 photomicrograph, A1:99–100; A5:62–63, 65
gabbronorites, intrusive, petrogenesis, A1:16–18
gabbronorites, olivine, petrography, B4:3
gabbronorites, oxide lithologic units, A5:6–8 photograph, A5:115–116 photomicrograph, A5:62–65, 112, 114, 117–118; A7:54 strain localization, A5:26
gabbros average compressional wave velocity, A3:148 brittle deformation, A3:26–27 calcium metasomatism, A3:19–20 deformation, A5:123; A10:18–19 emplacement, A3:19 geochemistry, A5:36–38, 154–158; A6:106–108; A10:24–25, 114–124 hydrothermal alteration, A5:12, 15–16; A6:10–11; A10:12–17 lithologic units, A3:4–5, 8–9; A5:4–9; A6:3–8 median destructive field, A3:151 metamorphic veins, A5:17 photograph, A3:84, 107; A9:56; A10:49–53, 56, 110 photomicrograph, A5:122; A6:56 physical properties, A10:125–126 physical properties vs. depth, A3:142 protoliths, A5:18 thermal conductivity, A3:146; A5:160–161; A7:103 veins, A3:16 See also harzburgites/gabbros contact; microgabbros
gabbros, altered alteration intensity vs. depth, A5:81 photograph, A3:84–85; A9:40; A10:80–81, 88 photomicrograph, A3:86, 89; A5:82 sulfides, B3:1–18 X-ray diffraction data, A10:80
gabbros, brown amphibole hydrothermal alteration, A6:12–13 petrography, B4:4 photograph, A1:113 photomicrograph, A6:72–73
gabbros, crenulate contacts, photograph, A1:135
gabbros, crosscutting, lithologic units, A10:5–10
gabbros, deformed photograph, A3:120 photomicrograph, A3:100
gabbros, deformed oxide, photomicrograph, A9:76
gabbros, miarolitic, geochemistry, A1:118
gabbros, mixed grain sizes, photograph, A1:134
gabbros, oikocrystic olivine, lithologic units, A6:6–7
gabbros, olivine hydrothermal alteration, A5:13; A10:14–17 lithologic units, A6:6–7; A10:6–10 petrography, B4:3 photograph, A10:60–61 photomicrograph, A6:59; A10:64
gabbros, oxide Formation MicroScanner imagery, A7:88, 115 geochemistry, A10:24–25 hydrothermal alteration, A9:9 lithologic units, A9:3–7; A10:3–10 magnetic susceptibility vs. oxides, A10:66–67 photograph, A10:51 photomicrograph, A7:82; A10:65
gabbros, pegmatitic lithologic units, A5:6 photograph, A1:92; A3:71 textures, A3:8
gabbros, quartz–olivine lithologic units, A7:4–7 photograph, A7:49–50
gabbros, rodingitized lithologic units, A9:3–7 photograph, A9:66 photomicrograph, A9:66
gabbros, troctolitic, photomicrograph, A6:84, 87
gamma-ray intensity logs, vs. depth, A10:148
gamma-ray logs igneous rocks, A10:40 vs. depth, A7:120; A10:146 vs. resistivity logs, A7:120 See also environmentally corrected gamma ray logs; total spectral gamma ray logs
gamma rays igneous rocks, A3:37; A5:40; A6:32; A7:25–26, 36; A9:21; A10:28 vs. depth, A3:143; A5:73
gamma rays, corrected, vs. depth, A7:102; A9:91; A10:127
general purpose inclinometry tool, magnetic field logs, A7:34–35, 113
geobiology, olivine dissolution rate, B1:18
geochemistry gabbroic rocks, A1:5 peridotites, A1:10–11 Site 1268, A3:33–37, 159–160 Site 1270, A5:34–39 Site 1271, A6:27–31 Site 1272, A7:20–25 Site 1274, A9:17–20 Site 1275, A10:22–27
geology, Mid-Atlantic Ridge, A1:78–79
glass rinds, lithologic units, A7:5
grain boundaries hydrothermal alteration, B4:3–4 lithologic units, A9:5–7 photomicrograph, A7:57; A9:57; B1:27 See also crenulate contacts; olivine triple junctions
grain size mafic rocks, A7:2–8 orthopyroxene and clinopyroxene, A9:51 vs. depth in gabbros, A10:54, 59
granophyre geochemistry, A10:24–25 lithologic units, A10:3–10 photograph, A10:55–56, 58, 61, 64
granulite facies deformation, A6:20 deformation vs. alteration, A5:103 shear zones, A3:11–12
greenschist facies alteration, A6:95 gabbros, A3:19 hydrothermal alteration, A6:17 photomicrograph, A6:74–75 shear zones, A6:23–24 textures, A5:139
grossular. See hydrogrossular

H

halos. See alteration halos
harzburgites altered orthopyroxene proportion, A3:68 altered pyroxene stratigraphic proportion, A3:72 deformation, A7:13 Formation MicroScanner imagery, A7:88 hydrothermal alteration, A5:11–12, 15–16; A6:12, 16–17 lithologic units, A3:4–6; A5:4–9; A6:4–5; A7:3–4; A9:2–7; A10:4–10 lithology, A3:5–6 metamorphic veins, A5:16–17 microprobe data, B2:1–13 petrography, B4:3 photograph, A1:117; A3:83, 102, 107, 127–130; A5:54, 69, 74, 95, 110; A7:44–47, 77; A9:36–38, 78–79 photomicrograph, A5:56–59, 75, 130–131, 145; A6:81; A7:82; A9:69–71 proportions, A1:98 textures, A7:5–6
harzburgites, basement, photograph, A7:76
harzburgites, mylonitic, photograph, A9:38
harzburgites, orthopyroxene-rich, lithologic units, A5:4
harzburgites, protogranular, photograph, A3:101; A7:80
harzburgites, protomylonitic, photomicrograph, A5:130
harzburgites, residual trace elements, B1:31 uranium, B1:32
harzburgites, serpentinized petrology, A8:2–3 photograph, A1:86–87; A3:73, 76, 82, 84; A5:78–79, 89–90, 96, 98, 100–101, 107, 142; A9:61, 64 photomicrograph, A3:74–75, 99; A5:79; A8:9; A9:61, 77 X-ray diffraction data, A9:61
harzburgites, serpentinized "popcorn," photograph, A5:104
harzburgites, soft clayey serpentinized, clay alteration, A7:8–9
harzburgites/gabbros contact, photograph, A9:59
heazlewoodite, iron–nickel–sulfur–oxygen system phase equilibria, A3:97
hematite iron–nickel–sulfur–oxygen system phase equilibria, A3:97 photograph, A5:101; A10:80 veins, A3:13–14
high pressure, fractional crystallization, B1:4–6
hornblende, X-ray diffraction data, A10:80
Hostile Environment Litho-Density Sonde caliper logs, vs. depth, A10:147
hybrid rocks hydrothermal alteration, A6:13–14 lithologic units, A6:8
hybridization, dunites and gabbroic rocks, B4:1–23
hydration peridotites, A3:33 timing, A3:30
hydration, synkinematic, magmatic veins, A5:29–30
hydrogen peridotites, A6:28 See also magnesium–calcium–silicon–oxygen–hydrogen system
hydrogrossular calcium metasomatism, A3:20 photomicrograph, A6:85
hydrothermal alteration basalts, A7:9–10 breccia, A5:12 gabbroic rocks, B1:8–11 gabbros, A5:12; A10:12–17 harzburgites and dunites, A5:11–12 igneous rocks, A5:13–34; B4:3–4 intensity vs. depth, A3:90 lithologic units, A6:10–18; A9:7–11 mafic rocks, A7:9–10 peridotites, A1:14, 18–20, 26–28, 42–43, 61–62 secondary minerals, A3:11–13 Site 1271, A1:37–38 Site 1274, A1:47–50 ultramafic dikes, A5:12 ultramafics, A7:7–9 vs. density, A1:126 vs. magnetic susceptibility, A1:126 See also alteration; metasomatism; reaction coronas; reaction rims; reaction zones; secondary minerals; weathering
hydrothermal reactions, chemistry, A9:11
hydroxychlorite, clay alteration, A7:8–9

I

iddingsite lithologic units, A10:6 photograph, A10:60
igneous petrology Site 1268, A3:3–10 Site 1269, A4:2–4 Site 1270, A5:3–20 Site 1271, A6:2–9 Site 1272, A7:2–7 Site 1273, A8:2–3 Site 1274, A9:2–7 Site 1275, A10:3–10
igneous rock contacts orientation, A3:132 photograph, A3:58–59 stereo plots, A7:78
igneous rock proportion Site 1268, A1:15–16 Site 1270, A1:24–25 Site 1271, A1:33–34 Site 1272, A1:40–41 Site 1274, A1:46
igneous rocks crust, A1:6–12 geochemistry, A5:177–178; A6:122; A7:124; A9:106; A10:158–159 spreading rates, B1:30 thermal conductivity, A5:179 X-ray diffraction data, A3:156; A6:120
ilmenite igneous rocks, A10:26–27 X-ray diffraction data, A10:80
ilmenite lamellae, photomicrograph, A10:83
impregnation residual peridotites, B1:7–8 textures, A6:21–22
inclinometry logs igneous rocks, A10:41 See also general purpose inclinometry tool
inclusions hydrothermal alteration, A7:9–10 lithologic units, A6:5 orthopyroxenite, A3:8 zeolites, A10:13 See also fluid inclusions; melt inclusions
intergrowths harzburgites, A3:6 lithologic units, A5:5 photomicrograph, A5:58; A7:51–52
intergrowths, symplectic lithologic units, A7:7 photomicrograph, A6:56; A7:58 residual peridotites, B1:7–8
intrusions digital images, A6:88 gabbros, A5:17 gabbros and gabbronorites, A3:8–9 lithologic units, A3:4 photograph, A3:84 timing, A3:30 See also plutons
intrusions, gabbroic lithologic units, A5:10 magmatic veins, A3:29–30 orthopyroxenite, A3:7–8 photograph, A5:74, 95 photomicrograph, A5:71, 99 structures, A1:8–10
intrusive rocks, petrogenesis, A1:36–37
iowaite clay alteration, A7:8–9 microprobe data, B2:1–13 X-ray diffraction data, A7:9, 60, 65
iron oxidation, A7:9 vs. sulfur, B2:9 See also magnesium/iron ratio; magnesium + iron
iron/titanium ratio, igneous rocks, A10:26
iron–nickel–sulfur–oxygen system, phase equilibria, A3:97
iron number spinel, B4:4 vs. depth, B4:19 vs. titanium oxide, B4:16
iron oxide alteration, A3:36 diabase and basalt, A7:23 gabbroic rocks, A10:24 gabbros, A6:30–31 igneous rocks, A5:35; A10:25–26 peridotites, A3:34; A6:28 photomicrograph, A5:59 troctolites, A10:23 veins, A5:92, 97; A6:65 volume percentage in veins, A3:92 vs. magnesium oxide, A3:138; A5:148; A6:103; A7:93, 97; A9:85; A10:116, 119; B2:6, 8, 9 vs. magnetic susceptibility, A3:141 vs. silica, A3:137 vs. titanium oxide, A5:155; A10:120
iron oxide, interstitial, photomicrograph, A5:62
iron oxyhydroxide alteration, A8:2–3 carbonate veins, A9:10–11 hydrothermal alteration, A5:12 photograph, A5:95; A9:64; A10:90 photomicrograph, A5:89; A10:95
iron–titanium oxides deformation, A5:26 mylonites, A3:12

J

joints, weathering stains, A7:12

K

kamacite, iron–nickel–sulfur–oxygen system phase equilibria, A3:97
kernels. See brucite kernels; olivine kernels
kink bands deformation, A9:12 harzburgites, A7:14–15 photomicrograph, A3:64, 100; A5:62; A9:70–71, 74

L

lamellae photograph, A5:115 photomicrograph, A9:47–48 See also exsolution lamellae; ilmenite lamellae
lanthanum/samarium ratio, mantle sources, A1:81
laths. See plagioclase laths
lead. See first lead paradox; lead paradox; thorium/lead ratio; uranium/lead ratio
lead/cerium ratio, peridotites, B1:16–18
lead isotopes mantle sources, A1:81 peridotites, B1:17–18
lead paradox, peridotites, B1:16–18
Leg 209, coring summary, A1:139
lherzolite. See spinel lherzolite facies
lithium change through time for fumarate enrichment media, B5:21 change through time for iron oxide enrichment media, B5:22 change through time for manganese oxide enrichment media, B5:23 change through time for sodium nitrate enrichment media, B5:20 dissolution in culture media, B5:18 dissolution in peridotites, B5:6–10
lithium, dissolved amount through time for two cultures, B5:35 average amount, B5:28 average amount through time, B5:29–30
lithologic units stratigraphy, A3:4–5; A5:4–9; A6:3–9; A7:2–4; A9:2–7; A10:3–10 Unit I, A3:4; A5:4, 6–7; A6:3–4; A7:2–3; A9:2–3; A10:3, 5 Unit II, A3:4; A5:4, 8; A6:4; A7:3–4; A9:3; A10:4–5 Unit III, A3:4–5; A5:4–5, 7; A6:4; A9:3; A10:4–6 Unit IV, A3:5; A5:9; A6:4–5; A10:6 Unit V, A5:7; A10:6 Unit VI, A5:8–9 Unit VII, A5:7
lithology discrete samples, A6:126 proportions, A1:98
lithostratigraphy summary, A1:84, 109, 116, 121, 129; A5:53, 67, 73; A10:48, 57 vs. depth, A3:57; A6:44, 54; A9:35; A10:3–10; B4:2–3, 11
lizardite hydrothermal alteration, A9:8–11 igneous rocks, A5:35 X-ray diffraction data, A1:86; A6:64; A7:60, 63; A9:60–61, 65
loss on ignition gabbros, A3:35 igneous rocks, A5:34–35 peridotites, A3:33–34; A6:28; A7:21 troctolites, A10:23 vs. magnesium oxide, A6:102; A7:93 vs. silica, A3:140

M

mafic rocks alteration, A3:12–13 geochemistry, A3:35–36; A7:23–25, 97–100 hydrothermal alteration, A7:9–10; A9:9 photograph, A7:49–50 textures, A7:43
magmas, rock generations, A6:26–27
magmatic layering distribution and orientation, A10:21 stereo plots, A7:78
magmatism, intrusions, A3:10
magnesium–calcium–silicon–oxygen–hydrogen system, mineral–fluid phase diagram, A6:17–18, 77
magnesium/iron ratio, hydrothermal alteration, B1:9
magnesium + iron, vs. silica, B2:6, 8, 9
magnesium number gabbroic rocks, B1:7 igneous rocks, A10:25–26 peridotites, A3:34; A6:28; A7:21 spinel, B4:4 troctolites, A10:23 vs. aluminum oxide, B2:6, 8 vs. chromium, A10:117 vs. chromium number, B2:7; B4:14 vs. nickel, A1:111, 133; A7:95; A10:117 vs. silica, A1:88, 103, 118; A10:114 vs. zirconium, A1:118, 137; B1:29
magnesium number, molar, histograms in gabbroic rocks, A1:136
magnesium oxide diabase and basalt, A7:23 gabbroic rocks, A10:24 gabbronorites, A7:24 gabbros, A3:35 igneous rocks, A5:35, 37–39; A10:25–26 peridotites, A3:34; A6:28; A7:21 troctolites, A10:23 vs. aluminum oxide, A6:102, 108; A10:119 vs. chloride, B2:6, 8, 9 vs. chromium, A7:99 vs. iron oxide, A3:138; A5:148; A6:103, 108; A7:93; A9:85; A10:116, 119; B2:6, 8, 9 vs. loss on ignition, A6:102; A7:93 vs. major oxides, A7:97 vs. silica, A3:137, 140; A5:148, 154; A6:102; A7:93; A9:84; B2:9 vs. titanium oxide, A6:108 vs. water content, A9:84 vs. zirconium, A7:100
magnesium oxide/silica ratio, vs. aluminum oxide/silica ratio, A9:20, 89
magnetic anomalies, estimates, A7:114
magnetic declination histograms, A6:116; A7:110; A9:99 rose diagrams, A5:170 vs. depth, A9:116
magnetic declination, archive half, vs. discrete sample declination, A5:169
magnetic declination, discrete sample, vs. archive half declination, A5:169
magnetic fabric, deformation, A9:24
magnetic field, vs. depth, A10:149
magnetic field logs general purpose inclinometry tool, A7:34–35, 113 igneous rocks, A10:41 vs. depth, A7:34–35, 113
magnetic inclination discrete sample histograms, A10:141 gabbros and peridotites, A3:45–47 histograms, A5:168; A6:116; A7:110; A9:99 remanence variation, A3:152 vs. depth, A3:149; A7:74, 107; A9:96, 100, 116; A10:135–136 vs. rotation about horizontal axis, A1:93 vs. rotation axis azimuth twenty degrees, A1:94, 108
magnetic inclination logs, vs. depth, A7:113
magnetic intensity discrete samples, A6:34 remanence variation, A3:152 vs. depth, A9:116
magnetic properties, vs. depth, A10:149
magnetic susceptibility anisotropy, A3:44, 165; A5:45, 186; A6:35, 128; A7:31, 133; A9:24–25, 98, 110; A10:35, 140, 165–166 continuous measurements, A3:41–42; A5:42 eigen vector of tensor, A5:171; A6:117; A7:111 igneous rocks, A3:37; A5:40; A6:32; A7:26; A9:21; A10:28 magnetite estimate, A5:61 vs. depth, A3:144–145, 149; A5:159; A6:109; A7:74, 107; A9:96 vs. hydrothermal alteration, A1:126 vs. iron oxide, A3:141 vs. oxides, A10:66–67 vs. water content, A3:141
magnetic susceptibility, corrected, vs. depth, A7:102; A9:91; A10:128–129
magnetic susceptibility, mean vs. bulk density, A10:30–31, 134 vs. grain density, A10:30–31, 134
magnetic susceptibility, volume, vs. depth, A10:135–136
magnetite hydrothermal alteration, A5:11–12; A6:11–14; A9:7–11 igneous rocks, A10:26–27 iron–nickel–sulfur–oxygen system phase equilibria, A3:97 lithologic units, A10:7–10 microprobe data, B2:1–13 mylonites, A3:12 photomicrograph, A6:68; A7:66; A10:83, 85, 92, 94 serpentinite, A7:7–10 silica metasomatism, A3:18–20 veins, A3:13–14; A5:80; A6:65, 71; A9:68 volume percentage in veins, A3:92 vs. depth, A5:60 X-ray diffraction data, A6:63–64; A7:60, 63; A9:60, 65 X-ray diffraction data in serpentinized harzburgite, A3:73; A5:78
magnetite, euhedral, photomicrograph, A7:64
magnetite, modal, vs. depth, A10:68–71
major elements alteration, A3:36–37 altered gabbronorites, A1:91 altered peridotites, A1:90 gabbros, A3:35; A6:30 igneous rocks, A3:159–160; A5:34–39, 177–178; A6:122; A7:124; A9:106; A10:158–159 mineral chemistry, B4:4–5 mineral separates, A6:123
major elements, anhydrous altered gabbronorites, A1:91, 101 altered peridotites, A1:90, 105, 110, 119, 123
mantle conductive boundary layer, B1:1–33 deformation, A1:1–139 petrology, A3:3–10 seismic velocity, A1:85 temperature, A1:13–14 upwelling, A1:6–12 upwelling diagrams, A1:83
mantle, upper, hybridization of dunites and gabbroic rocks, B4:1–23
median destructive field, demagnetization, A3:43–44, 151
melt flow hybridization of dunites and gabbroic rocks, B4:1–23 transport, A1:6–12
melt inclusions, photomicrograph, A8:8
melts fractional crystallization, B4:6 migration, B4:5–6 transport, A1:6–12
mesh rims, ultramafics, A3:11
mesostasis, hydrothermal alteration, A10:12–15
metamorphic petrology Site 1268, A3:10–20 Site 1269, A4:2–4 Site 1270, A5:3–20 Site 1271, A6:9–18 Site 1272, A7:7–11 Site 1274, A9:7–11 Site 1275, A10:10–17
metamorphism gabbroic rocks, B1:8–11 lithologic units, A6:10–18 parageneses, A1:49–50 peridotites, A1:18–20, 26–28, 42–43, 61–62 photomicrograph, A6:72–76 Site 1271, A1:37–38 Site 1274, A1:47–50 spreading centers, B1:4–6
metaperidotite, carbon dioxide, A1:124
metasomatism alteration, A3:12–13 hydrothermal alteration, A5:16 peridotites, A1:18–20, 26–28, 42–43, 61–62 silica, A3:18–20 Site 1271, A1:37–38 Site 1274, A1:47–50
microbes, peridotites, B5:6–10
microbial enrichment cultures, peridotites, B5:1–38
microbiology metaperidotite, A1:23 mud, A4:4–5, 15 peridotites, B5:1–38 Site 1268, A3:47–48 Site 1269, A4:4–5 Site 1270, A5:45–46 Site 1271, A6:35–36 Site 1272, A7:31–32 Site 1274, A9:25–27 Site 1275, A10:36–37 solid samples, A5:45–46; A7:31; A9:25–26 surface water and atmosphere, A3:47–48, 171; A5:46, 188; A7:32, 134; A9:26–27, 115; A10:36–37, 167 See also aerobiology; geobiology
microboudins, photomicrograph, A6:72
microcracks photograph, A6:55 photomicrograph, A10:89
microfractures lithologic units, A6:3–4 photomicrograph, A9:49
microgabbros alteration, A3:8; A6:13 hydrothermal alteration, A10:12–17 lithologic units, A5:8–9; A7:2–7; A10:3–10 photograph, A5:86, 116
microgabbros, foliated oxide, stereo plots, A5:120
microlites. See olivine microlites; plagioclase microlites
microorganisms, aerobiology, B1:18
microphenocrysts hydrothermal alteration, A7:9–10; A10:12–15 See also olivine microphenocrysts
microshear bands, photomicrograph, A6:75
microsphere tracers, culture experiments, B5:26
microspheres. See fluorescent microspheres
microstructures, harzburgites, A3:6
microtextures, hydrothermal alteration, A5:12
microveins, serpentinite, A7:8–9
Mid-Atlantic Ridge mantle boundary layer, B1:1–33 maps, B5:15 peridotites, A1:1–139
mid-ocean ridges chromitites, A1:35–36 zircon provenance, B1:18 See also slow-spreading ridges
millerite hydrothermal alteration, B1:10 igneous rocks, B3:4–5 iron–nickel–sulfur–oxygen system phase equilibria, A3:97 vs. depth, B3:10
mineral chemistry, major elements, B4:4–5
mineral separates, geochemistry, A6:123
mineralization, sulfides, B3:1–18
mineralogy veins, A5:176; A6:121; A9:67, 104; A10:86, 97, 157 X-ray diffraction data, A5:175
Mohorovicic discontinuity, gabbroic rocks, B1:15
mud lithologic units, A9:3–7 photograph, A1:127
mylonite zones photograph, A3:58 photomicrograph, A6:85 vs. depth, A3:98
mylonite zones, serpentinized, photograph, A3:105
mylonites deformation, B1:12–15 hydrothermal alteration, A5:12; A6:15 intensity in cores, A5:111 photograph, A3:107; A5:136 photomicrograph, A3:106; A5:72, 79, 118 reverse shear zones, A3:33 See also gabbromylonites; protomylonites
mylonites, dunite, photomicrograph, A5:84–85
mylonites, gabbro, photomicrograph, A5:130
mylonites, high-strain, photograph, A3:104
mylonites, peridotite, photograph, A1:97
mylonites, weathered harzburgite, photomicrograph, A9:74

N

neoblasts deformation, A5:26; A9:12 harzburgites, A3:6 photomicrograph, A1:99–100, 114–115; A3:67, 100; A5:63–64, 90, 113, 117, 121; A6:72, 74; A7:54, 82; A9:57, 70–71
nickel diabase and basalt, A7:23 gabbroic rocks, A10:24–25 gabbros, A3:35–36; A6:30 igneous rocks, A5:36–37; A10:26 peridotites, A3:34; A6:29; A9:18–19 sulfides, B3:4 troctolites, A10:23 vs. aluminum oxide, A5:153 vs. magnesium number, A1:111, 133; A7:95; A10:117 vs. sulfur, B2:9 See also iron–nickel–sulfur–oxygen system
nickel oxide, vs. chromium oxide, B2:6, 8
nontronite hydrothermal reactions, A9:11 X-ray diffraction data, A9:65
norite, lithologic units, A10:5–10

O

oikocrysts lithologic units, A6:6–7 photomicrograph, A10:62
olivine composition, B4:20 composition vs. depth, B4:19 dissolution rates, B5:37 harzburgites, A3:5–6 hydrothermal alteration, A5:12; A6:11–14; A9:7–11; B4:3–4 impregnation, A6:21–22 lithologic units, A5:4–8; A6:3–10; A7:3–4; A9:3–7; A10:4–10 magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 microprobe data, B2:1–13 mineral chemistry, B4:4 orthopyroxenite, A3:7–8 photograph, A5:89; A6:50, 55, 82, 92; A7:55; A10:50, 60–61 photomicrograph, A1:122; A3:64, 99–100; A5:58, 68, 72, 85, 105, 137; A6:48–49, 56–59, 67–70, 76, 81, 84–85, 88; A7:51, 56, 58; A9:42, 44–45, 47, 49, 61–62, 70, 74; A10:62–64, 85, 93–94; B1:27 preferred orientation, B1:13 See also forsterite
olivine, euhedral embayed, photomicrograph, A8:8
olivine, occluded, photomicrograph, A9:69
olivine, poikilitic, lithologic units, A7:4
olivine, serpentinized, photomicrograph, A3:60–62, 66; A9:61
olivine, subhedral, photomicrograph, A6:74
olivine–amphibole–talc assemblage, phase equilibria, A6:17–18
olivine gabbros. See gabbros, olivine
olivine kernels hydrothermal alteration, A9:8–11 photomicrograph, A10:95
olivine microlites, photomicrograph, A7:48
olivine microphenocrysts, hydrothermal alteration, A7:9–10
olivine triple junctions, lithologic units, A6:3–8
orthopyroxene banding, A3:7–8 dunites, A3:7 gabbros, A3:8–9 grain size, A9:51 harzburgites, A3:6 hydrothermal alteration, A9:7–11; B4:3–4 lithologic units, A5:4–8; A6:4–10; A7:3–7; A9:2–7; A10:7–10 lithology and stratigraphy in peridotites, A7:42 microprobe data, B2:1–13 orthopyroxenite, A3:7–8 photograph, A3:102, 129; A5:54, 89; A7:45–47 photomicrograph, A1:89, 100; A3:78, 99–100; A5:56–58, 72, 91, 105, 112, 114, 117–118, 130–131; A6:46–47, 69, 81; A7:54, 56–59, 82; A9:42–50, 61, 69–71, 74; A10:62, 75–77; B1:27 porphyroclasts, A6:19 proportions, A3:9–10 vs. depth, A9:41 X-ray diffraction data, A9:61
orthopyroxene, altered photograph, A5:69 photomicrograph, A3:60–65, 67, 69; A5:70 proportion in harzburgite and dunites, A3:68
orthopyroxene, anhedral, photomicrograph, A5:68
orthopyroxene, elongated, photograph, A7:55
orthopyroxene, euhedral, photograph, A10:61
orthopyroxene, granular, photomicrograph, A9:69
orthopyroxene, interstitial photograph, A7:55 residual peridotites, B1:7–8
orthopyroxene, polygonal, lithologic units, A7:5
orthopyroxene, protogranular, photomicrograph, A9:69
orthopyroxene, subhedral, photomicrograph, A5:62
orthopyroxenites banding, A3:7–8 lithologic units, A5:4–6 photomicrograph, A3:69
osmium isotopes, peridotites, B1:15–16
oxidation hydrothermal reactions, A9:11 iron, A7:9 lithologic units, A7:2–4 photograph, A7:67; A9:64
oxide gabbros. See gabbros, oxide
oxide infillings, photomicrograph, A10:72
oxides photomicrograph, A10:74 vs. magnetic susceptibility, A10:66–67
oxides, interstitial lithologic units, A5:8–9 photomicrograph, A5:122; A7:54
oxides, magmatic, photomicrograph, A5:112–114, 117
oxygen hydrothermal alteration, B1:10–11 sulfides, B3:4–5 See also iron–nickel–sulfur–oxygen system; magnesium–calcium–silicon–oxygen–hydrogen system

P

P–T conditions phase equilibria, A6:18 See also thermobarometry
paleomagnetism deformation, B1:13 discrete samples, A3:164; A5:42–43 gabbro fabric orientation, A3:132 lithologic contact orientation, A3:132 magmatic vein orientation, A3:132 piece orientations from archive-half data, A3:166–167 Site 1268, A1:21–23; A3:41–47 Site 1270, A1:30–33; A5:41–45 Site 1271, A1:39; A6:33–35 Site 1272, A7:28–31 Site 1274, A9:22–25 Site 1275, A10:31–36 spinel foliation orientation, A3:132 tectonics, A1:44, 52–53, 63–65
paragenesis lithologic units, A6:7 metamorphism, A1:49–50
partial melting, textures, A6:21–22
pebbles lithologic units, A9:2 photograph, A9:38
pentlandite hydrothermal alteration, B1:10 igneous rocks, B3:4 microprobe data, B2:4 serpentinite, A3:11 vs. depth, B3:10
perfluorocarbon tracers contamination, A3:47, 168; A6:35–36, 129 gas chromatography, A5:172, 187; A6:118 standard curve, A3:153
peridotites average compressional wave velocity, A3:148 brittle deformation, A3:30 deformation, A5:28–29 depletion, A1:16, 25–26, 34, 41–42, 46–47 dissolution rates, B5:1–38 geochemistry, A1:10–11; A3:33–35; A5:34–36, 38, 148–153; A6:102–105; A7:21–22, 24, 93–96; A9:18–20, 84–89; A10:114–118 geology, A1:78–79 hydration, A3:33 hydrothermal alteration, A1:14 iron oxide vs. magnesium oxide, A3:138 lithologic units, A5:5–9; A7:2–7; A9:2–7 microbiology, B5:1–38 microprobe data, B2:1–13 Mid-Atlantic Ridge, A1:1–139 orthopyroxene, A7:42 osmium isotopes, B1:15–16 photograph, A3:108; A6:55 photomicrograph, A5:91; A6:70; A7:82 physical properties vs. depth, A3:142 plain-polarized light images, B5:16–17 rift valleys, A3:32–33 spreading centers, B1:4–6 spreading rates, B1:30 structures, A1:8–10 thermal conductivity, A3:146; A5:160–161; A6:110; A7:103 trace elements, A3:139 veins, A3:93 vs. depth, A6:54 See also metaperidotite
peridotites, altered geochemistry, B2:11–13 sulfides, B3:1–18
peridotites, impregnated, trace elements, B1:31
peridotites, poikilitic, photomicrograph, B1:27
peridotites, poikilitic impregnated, forsterite vs. anorthite, B1:28
peridotites, residual, impregnation, B1:7–8
peridotites, Riddle Nickel Mountain, composition, B5:34
peridotites, serpentinized geochemistry, A6:27–29 remanent magnetization, A1:15
petrography, igneous rocks, B4:3–4
pH, phase equilibria, A6:17
phase equilibria iron–nickel–sulfur–oxygen system, A3:97 magnesium–calcium–silicon–oxygen–hydrogen system, A6:17–18, 77 olivine–amphibole–talc assemblage, A6:17–18 serpentine–brucite assemblage, A6:17–18 serpentinization, A6:17–18 sulfides, B3:8–9
phenocrysts. See plagioclase phenocrysts; spinel phenocrysts
photoelectric effect logs igneous rocks, A10:40 vs. depth, A7:34, 112; A10:148
physical properties Site 1268, A3:37–41 Site 1270, A5:40–41 Site 1271, A6:32–33 Site 1272, A7:25–28 Site 1274, A9:21–22 Site 1275, A10:27–31
picrolite hydrothermal alteration, A6:14 vs. depth, A9:68
plagioclase altered gabbros, A5:82 deformation, A5:26; A6:20 gabbros, A3:9 hydrothermal alteration, A6:10; A10:12–15 lithologic units, A5:7–9; A6:3–10; A7:4–7; A10:3–10 photograph, A3:87 photomicrograph, A1:99–100; A3:86, 88–89, 100; A4:11; A5:62–66, 71, 112–114, 117–118, 121; A6:47, 59, 61, 84–85; A7:51–54; A9:57–58, 66, 76; A10:72–74, 76–78, 82, 84–85, 91, 94, 102; B1:27 vs. depth, A5:119 See also albite; anorthite
plagioclase, acicular, photomicrograph, A8:8
plagioclase, euhedral, photomicrograph, A5:62
plagioclase, modal, vs. depth, A5:60
plagioclase, resorbed, photomicrograph, A10:73–74
plagioclase, subhedral, photomicrograph, A6:61
plagioclase facies, spreading centers, B1:5–6
plagioclase laths, photomicrograph, A6:59
plagioclase laths, acicular, basalts, A4:3
plagioclase microlites, skeletal, photomicrograph, A7:48
plagioclase phenocrysts petrology, A8:2 photomicrograph, A10:63
plate tectonics, plate spreading geometry, B1:13–15
plutonic rocks, petrogenesis, A1:42, 47
plutons, gabbroic rocks, B1:15
Pokrovsky and Schott rates, dissolution in culture media, B5:31
polydymite igneous rocks, B3:4 iron–nickel–sulfur–oxygen system phase equilibria, A3:97 vs. depth, B3:10
polygonalization, photomicrograph, A9:71
porosity discrete samples, A6:125 igneous rocks, A3:38–41, 162; A5:41, 181; A6:33; A7:27–28, 126; A9:22, 108; A10:29, 161 resistivity logs, A10:39–40 vs. depth, A7:101; A9:90; A10:125–126
porosity logs, vs. depth, A10:147
porphyroclasts deformation, A5:28–29 harzburgites, A3:6 orthopyroxene, A6:19 photograph, A3:104–105, 128; A5:69, 136 photomicrograph, A1:114–115; A3:60, 63, 106; A5:56–57, 90–91, 112–114, 121, 130, 137; A6:72, 74, 85–86; A9:45, 70
porphyroclasts, diabase, photomicrograph, A10:103
porphyroclasts, orthopyroxene, photomicrograph, A9:77
porphyroclasts, spinel–pyroxene–olivine, photomicrograph, A9:74
potassium mafic rocks, A7:25 See also sodium + potassium
potassium logs igneous rocks, A10:40 vs. depth, A7:120; A10:148
potassium oxide diabase and basalt, A7:23 vs. magnesium oxide, A7:97 vs. water content, A7:98
preferred orientation foliation, A9:14–15 harzburgites, A7:13 olivine and pyroxene, B1:13
prehnite calcium metasomatism, A3:20 photomicrograph, A6:84–85; A9:66
pressure calculated vs. experimental, A1:131 vs. depth, A10:150 vs. temperature, A1:132 See also high pressure
pressure quench, microgabbro, A3:8
pressure shadows photograph, A3:104–105 photomicrograph, A3:106
protocataclasite, photograph, A7:73
protoliths gabbros, A5:18 photomicrograph, A6:73
protomylonites, intensity in cores, A5:111
pseudomorphs gabbros, A3:8 hydrothermal alteration, A5:14, 18; B4:3–4 microprobe data, B2:1–13 photograph, A3:107 photomicrograph, A1:89; A3:77–78, 86, 99, 106; A5:105, 118, 130–131; A6:46–47, 81, 86; A9:61; A10:77 serpentinite, A7:7–9 ultramafics, A3:11
pyrite hydrothermal alteration, B1:11 igneous rocks, B3:4 microprobe data, B2:4 photograph, A5:101 photomicrograph, A1:89; A3:78; A5:79, 85 veins, A3:14 vs. depth, B3:10
pyroxene altered gabbros, A5:82 deformation, B1:12–15 hydrothermal alteration, A5:12 hydrothermal reactions, A9:11 lithologic units, A10:7–10 microprobe data, B2:1–13 photograph, A3:87, 128; A5:89 photomicrograph, A5:83, 113 preferred orientation, B1:13 stereo plots, A5:120 See also clinopyroxene; orthopyroxene
pyroxene, altered, proportion in harzburgite and dunites, A3:72
pyroxene crystals, photograph, A3:59
pyroxenites photograph, A3:129–130; A5:116 photomicrograph, A5:59 proportions, A1:98 transport, A1:6–12 veins, A3:16–17
pyrrhotite hydrothermal alteration, B1:10 igneous rocks, B3:4 iron–nickel–sulfur–oxygen system phase equilibria, A3:97 serpentinite, A3:11 vs. depth, B3:10

Q

quartz hydrothermal alteration, A6:12–13; A7:9–10 lithologic units, A7:4–7; A10:3–10 magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 photograph, A10:80 photomicrograph, A3:89; A7:52–53, 69; A10:80 veins, A6:71
quenching, clinopyroxene, A4:3

R

rare earths hydrothermal alteration, B1:9–10 peridotites, B1:17–18
reaction coronas hydrothermal alteration, A10:13 photograph, A3:87 photomicrograph, A10:85
reaction rims lithologic units, A6:6–7 photomicrograph, A6:56, 60
reaction zones, photograph, A9:59
recrystallization deformation, A6:20 lithologic units, A5:4–34; A9:3–7 orthopyroxenite, A3:7–8 photomicrograph, A1:114–115; A3:63–65, 69, 100; A5:57–58, 112, 117–118; A6:72–76, 84–88; A9:45–47, 74, 76
relict minerals photomicrograph, A9:61, 77; A10:93–95 serpentinite, A7:8–9
remanent magnetization archive-half data, A5:184–185; A6:127; A7:107, 130–132; A9:31, 112–114, 116; A10:164 continuous measurements, A3:42–43; A6:33–34; A7:28–29; A9:23; A10:31–34 directions, A5:43–45; A6:34–35; A7:29–31; A10:35–36 discrete samples, A5:183; A6:34; A7:29, 129; A9:23–24, 109; A10:34, 162–163 effects of rotation of vectors, A1:95 histograms for archive halves, A1:138 percent remaining after demagnetization, A3:149 peridotites, A1:8–10 serpentinized peridotites, A1:15 vs. depth, A9:96; A10:135–136
remanent magnetization, anhysteretic, anisotropy, A9:24–25, 98, 111
remanent magnetization, characteristic continuous measurements, A10:31–34 directions, A7:29–31 vs. depth, A7:74, 107
remanent magnetization, characteristic/natural ratio, vs. depth, A7:74, 107; A9:96; A10:135–136
remanent magnetization, natural continuous measurements, A10:31–34 vs. depth, A3:149; A7:74, 107
remanent magnetization, normalized, decay curves, A5:166
resistivity, contrast of fault zones in Formation MicroScanner imagery, A7:117
resistivity-at-the-bit imagery, A10:38, 142 original and smoothed, A10:143 structures, A10:144 three-dimensional display, A10:145
resistivity logs porosity, A10:39–40 vs. depth, A7:34, 112; A10:146 vs. gamma-ray logs, A7:120 See also deep resistivity logs; shallow resistivity logs
rift valleys peridotites, A3:32–33 plate spreading geometry, B1:13–15
rodingitization, hydrothermal reactions, A9:11
rubble zone alteration, A8:2–3 breccia, A7:12 photograph, A7:72 stereo plots, A7:78
rutile, photomicrograph, A6:52
rutile, euhedral, photomicrograph, A6:61

S

samarium. See lanthanum/samarium ratio
scandium gabbroic rocks, A10:25 gabbros, A6:30 igneous rocks, A5:36, 39; A10:26 peridotites, A3:34; A6:29; A7:22; A9:18–19 troctolites, A10:23 vs. aluminum oxide, A3:139; A5:152; A6:105, 107; A7:96; A9:87; A10:122 vs. titanium oxide, A10:123 vs. vanadium, A5:158
schistosity, photomicrograph, A6:73
schists, photomicrograph, A1:114–115
schists, amphibole–chlorite hydrothermal alteration, A6:15 photomicrograph, A6:73
schists, amphibole–chlorite–serpentine, photomicrograph, A6:74
schists, deformed amphibole–talc, photomicrograph, A5:139
schists, low-temperature, photograph, A6:95
schists, serpentine foliation, A7:17 Formation MicroScanner imagery, A7:89 photomicrograph, A6:94
schists, serpentine–chlorite photomicrograph, A6:96 semibrittle shear zones, A6:24
schists, talc–amphibole, photomicrograph, A10:105
schists, talc–chlorite–amphibole, photograph, A10:104
schists, talc–tremolite, hydrothermal alteration, A6:12–13
schlieren gabbros, A5:17 photograph, A6:55 photomicrograph, A5:90
seafloor spreading, accretion, B1:30
seawater, artificial electron donors and acceptors, B5:33 sterile water, B5:32
secondary minerals, vs. depth, A3:90
seismic refraction profiles, velocity models, A1:82
seismic studies, deformation, A1:4
seismic velocity, mantle, A1:85
selvage, photograph, A3:70
sericite hydrothermal alteration, A6:12–13 photomicrograph, A6:67–68, 72, 76
serpentine alteration, A8:3 cross-fiber foliation depth vs. intensity, A3:112 foliation dip histograms, A3:110–111 hydrothermal alteration, A5:11–12; A6:11, 14; A9:7–11; B1:8–11 microprobe data, B2:1–13 photograph, A3:121–122; A5:110; A9:61–62; A10:90 photomicrograph, A3:79, 81, 99, 109; A6:75–76; A7:64; A10:95 serpentinite, A7:7–10 shear zones, A6:23–24 silica metasomatism, A3:18–20 veins, A5:13–19, 80, 87, 92, 97; A6:65, 71 volume percentage in veins, A3:92 X-ray diffraction data, A6:63; A7:60, 63 X-ray diffraction data in serpentinized harzburgite, A3:73; A5:78–79 See also alpha–serpentine; chrysotile; lizardite
serpentine, granular, photomicrograph, A5:109
serpentine, greenish, photograph, A9:65
serpentine, pleochroic, photomicrograph, A1:89; A3:61, 78
serpentine, schistose, photomicrograph, A5:109
serpentine–brucite assemblage, phase equilibria, A6:17–18
serpentine matrix, photograph, A5:108
serpentinite hydrothermal alteration, A5:12; A7:7–10 photomicrograph, A5:109 semibrittle shear zones, A6:24–25 silica metasomatism, A3:18–20 ultramafics, A3:11
serpentinite, altered photograph, A3:77 photomicrograph, A3:77, 80
serpentinite, fibrous, photograph, A3:117
serpentinite, sheared, harzburgites and dunites, A5:23
serpentinite, talc-altered, photograph, A1:87
serpentinization dunites, A6:64 harzburgites, A3:6 hydrothermal alteration, A5:12–20; A6:12–14; A9:8–11; B1:9–10 lithologic units, A7:2–4; A9:5–7 microprobe data, B2:1–13 mineral chemistry, B4:4–5 peridotites, A1:49 phase equilibria, A6:17–18 photograph, A3:108 photomicrograph, A3:81; A5:89; A6:70, 76 ultramafics, A3:11 vein alteration, A3:27–28 veins, A3:17
serpentinization, multistage, deformation, A5:18–19
serpentinization, syndeformational, hydrothermal alteration, A6:17
shallow resistivity logs, vs. depth, A10:147
shear fractures, anastomosing, photomicrograph, A10:105
shear wave velocity logs, vs. depth, A10:148
shear zones brown amphibole veins, A5:19–20 deformation, A9:16–17 deformation timing, A5:20 gabbros, A3:9 lithologic units, A3:4 orientation, A3:31–32 photograph, A5:115; A10:104 photomicrograph, A6:73–74, 87 plate spreading geometry, B1:13–15 schistose mat serpentine, A5:23
shear zones, anastomosing, photomicrograph, A5:90
shear zones, brittle dip vs. depth, A10:107 orientation, A5:27 photograph, A5:142 photomicrograph, A5:122 stereo plots, A5:132, 143–144; A6:101 thickness, A5:147
shear zones, brittle and ductile, recovery and boundaries, A6:78
shear zones, cataclastic dip histograms, A3:115 dip vs. depth, A3:116 igneous rocks, A3:26 stereo plots, A3:135; A9:81
shear zones, ductile photograph, A3:104 structures, B1:12–15
shear zones, gabbroic, photomicrograph, A5:99
shear zones, mylonitic alteration, A3:11–12 structures, B1:12–15
shear zones, reverse, mylonites, A3:33
shear zones, semibrittle gabbroic rocks, A10:19 metamorphic facies, A6:23–24 photomicrograph, A6:96
shear zones, serpentine, photomicrograph, A5:109
shear zones, talc-bearing, genesis, A5:20
shipboard geophysics, deformation, A1:4–5
silica gabbroic rocks, A3:140 gabbros, A6:30 hydrothermal alteration, B1:9 hydrothermal reactions, A9:11 igneous rocks, A5:35–39 metasomatism, A3:18–20 peridotites, A3:34; A6:28; A7:21 troctolites, A10:23 vs. aluminum oxide, A10:114 vs. chromium, A5:156 vs. magnesium number, A1:88, 103, 118; A10:114 vs. magnesium oxide, A5:148, 154; A6:102; A7:93; A9:84; B2:9 vs. magnesium + iron, B2:6, 8, 9 vs. major oxides, A3:137; A5:154 vs. sodium + potassium, B4:18 vs. titanium oxide, A5:156 vs. water content, A6:106; A10:114 See also aluminum oxide/silica ratio; magnesium oxide/silica ratio
silicates, calcium, hydrothermal alteration, A5:15
silicon dissolution in culture media, B5:19 dissolution in peridotites, B5:6–10 See also magnesium–calcium–silicon–oxygen–hydrogen system
silicon, dissolved amount through time for two cultures, B5:36 average amount, B5:27 average amount through time, B5:29–30
Site 1268, A3:1–171 bathymetry, A3:53–56 coring summary, A3:155 downhole measurements, A3:48 geochemistry, A3:33–37, 159–160 highly depleted mantle peridotites, A1:16 hydrothermal alteration, A1:18–20 igneous and mantle petrology, A3:3–10 igneous rock proportion, A1:15–16 lithology and stratigraphy, A3:57 location, A3:53–56 metamorphic petrology, A3:10–20 microbiology, A1:23; A3:47–48 microprobe data of primary phases and alteration products, B2:1–13 operations, A3:1–3 paleomagnetism, A3:41–47 paleomagnetism and tectonics, A1:21–23 petrogenesis of intrusive gabbronorites, A1:16–18 physical properties, A3:37–41 site description, A3:1–171 site summary, A1:15–23 structural geology, A1:20–21; A3:20–33 sulfide mineralization, B3:1–18 thermal conductivity, A3:161 vein mineralogy, A3:157 X-ray diffraction data, A3:156
Site 1269, A4:1–15 bathymetry, A4:7–9 coring summary, A4:14 igneous and metamorphic petrology, A4:2–4 location, A4:8 microbiology, A4:4–5 microbiology data for mud, A4:15 operations summary, A4:1–2 site description, A4:1–15 summary, A1:23–24
Site 1270, A5:1–188 bathymetry, A5:50–52 coring summary, A5:173–174 geochemistry, A5:34–39 highly depleted mantle peridotites, A1:25–26 hydrothermal alteration, A1:26–28 igneous and mantle petrology, A5:3–20 igneous rock proportion, A1:24–25 location, A5:51 microbiology, A5:45–46 operations summary, A5:1–3 paleomagnetism, A5:41–45 paleomagnetism and tectonics, A1:30–33 physical properties, A5:40–41 site description, A5:1–188 structural geology, A1:28–30; A5:21–34 summary, A1:24–33
Site 1271, A6:1–129 bathymetry, A6:41–43 chromitites of mid-ocean ridges, A1:35–36 coring summary, A6:119 downhole measurements, A6:36–37 dunite origin, A1:34–35 geochemistry, A6:27–31 highly depleted mantle peridotites, A1:34 hybridization of dunites and gabbroic rocks, B4:1–23 hydrothermal alteration, A1:37–38 igneous and mantle petrology, A6:2–9 intrusive rock petrogenesis, A1:36–37 location, A6:42 metamorphic petrology, A6:9–18 microbiology, A6:35–36 operations summary, A6:1–2 paleomagnetism, A6:33–35 paleomagnetism and tectonics, A1:39 physical properties, A6:32–33 proportion of igneous rocks, A1:33–34 site description, A6:1–129 structural geology, A1:38–39; A6:18–27 summary, A1:33–39
Site 1272, A7:1–134 bathymetry, A7:39–41 bulk density and caliper logs, A7:128 caliper logs summary, A7:127 coring summary, A7:121 downhole measurements, A7:32–36 geochemistry, A7:20–25 highly depleted mantle peridotites, A1:41–42 hydrothermal alteration, A1:42–43 igneous and mantle petrology, A7:2–7 igneous rock proportion, A1:40–41 location, A7:40 metamorphic petrology, A7:7–11 microbiology, A7:31–32 microprobe data of primary phases and alteration products, B2:1–13 operations summary, A7:1–2 paleomagnetism, A7:28–31 paleomagnetism and tectonics, A1:44 petrogenesis of plutonic rocks, A1:42 physical properties, A7:25–28 site description, A7:1–134 structural geology, A1:43–44; A7:11–20 summary, A1:39–44 X-ray diffraction data, A7:122
Site 1273, A8:1–10 bathymetry, A8:5–7 coring summary, A8:10 igneous and mantle petrology, A8:2–3 location, A8:6 operations, A8:1–2 site description, A8:1–10 summary, A1:45
Site 1274, A9:1–116 bathymetry, A9:32–34 coring summary, A9:102 downhole measurements, A9:27 geochemistry, A9:17–20 highly depleted mantle peridotites, A1:46–47 hydrothermal alteration, A1:47–50 igneous and mantle petrology, A9:2–7 igneous rock proportion, A1:46 location, A9:33 metamorphic petrology, A9:7–11 microbiology, A9:25–27 microprobe data of primary phases and alteration products, B2:1–13 operations, A9:1 paleomagnetism, A9:22–25 paleomagnetism and tectonics, A1:52–53 physical properties, A9:21–22 plutonic rock petrogenesis, A1:47 site description, A9:1–116 structural geology, A1:51–52; A9:12–17 summary, A1:45–53 X-ray diffraction data, A9:103
Site 1275, A10:1–167 bathymetry, A10:45–47 coring summary, A10:154–155 downhole measurements, A10:37–41 gabbroic rock petrogenesis, A1:59–61 geochemistry, A10:22–27 hydrothermal alteration, A1:61–62 igneous and mantle petrology, A10:3–10 location, A10:46 metamorphic petrology, A10:10–17 microbiology, A10:36–37 operations summary, A10:1–3 paleomagnetism, A10:31–36 paleomagnetism and tectonics, A1:63–65 physical properties, A10:27–31 site description, A10:1–167 structural geology, A1:62–63; A10:17–22 summary, A1:56–65 X-ray diffraction data, A10:156
slow-spreading ridges, crust, A1:6
smectite hydrothermal alteration, A5:15 See also chlorite/smectite
sodium + potassium, vs. silica, B4:18
sodium oxide diabase and basalt, A7:23 gabbros, A6:30 mantle sources, A1:81 peridotites, A7:22 vs. magnesium oxide, A7:97
sonic velocity logs, igneous rocks, A10:40
sphalerite, igneous rocks, B3:5
spherulites, lithologic units, A7:4
spinel alteration, A8:3 chromium–aluminum–magnesium–iron system, B4:14 chromium number, B4:4, 6 composition, B4:21 composition vs. depth, B4:19 deformation, B1:12–15 dunites, A3:7 fabric, A6:22 foliation, A5:32; A6:19 foliation orientation, A3:132 foliation photograph, A3:133 harzburgites, A3:6; A7:14–15 hydrothermal alteration, B4:3–4 lithologic units, A5:5; A6:3–10; A7:5–6; A9:3–7; A10:7–10 mantle sources, A1:81 microprobe data, B2:1–13 mineral chemistry, B4:4–5 orthopyroxenite, A3:7–8 photograph, A6:82, 92; B4:12 photomicrograph, A3:65, 67, 69, 77; A5:58, 68; A6:56–57, 81; A7:59; A9:42–43, 47–50, 55, 74; B1:27 vs. depth, B4:5, 20
spinel, chrome lithologic units, A6:8 photograph, A6:51
spinel, red–brown, photomicrograph, A8:9
spinel, vermicular photomicrograph, A5:70, 145; A6:69, 81 textures, A5:32
spinel lherzolite facies, spreading centers, B1:5–6
spinel phenocrysts, photomicrograph, A4:11
spinel shape distribution in dunites and harzburgites, A9:53 vs. depth in dunites and harzburgites, A9:52
spinel textures lithologic units, A9:5 variations in dunites and harzburgites, A9:54
spreading rates igneous rocks, B1:30 mantle upwelling, A1:7–8 plate tectonics, B1:14–15 See also slow-spreading ridges
strain localization, A3:30 localization in oxide gabbronorites, A5:26
stratigraphy, lithologic units, A3:4–5
stringers, serpentine–magnetite, alteration, A7:8–9
strontium diabase and basalt, A7:24 gabbroic rocks, A10:25 gabbros, A6:30 igneous rocks, A10:27 peridotites, A7:22 vs. aluminum oxide, A5:151 vs. carbon dioxide, A1:125 vs. zirconium, A7:100
strontium isotopes, mantle sources, A1:81
structural geology Site 1268, A1:20–21; A3:20–33 Site 1270, A1:28–30; A5:21–34 Site 1271, A1:38–39; A6:18–27 Site 1272, A1:43–44; A7:11–20 Site 1274, A1:51–52; A9:12–17 Site 1275, A1:62–63; A10:17–22
structures deformation, B1:11–15 orientation, A3:31–32 peridotites, A1:8–10 resistivity-at-the-bit, A10:144 See also microstructures
structures, brittle, dip vs. expanded depth, A5:125
structures, variolitic, petrology, A8:2
submersible studies, deformation, A1:4
sulfides hydrothermal alteration, B1:10–11 microprobe data, B2:1–13 mineralization, B3:1–18 osmium isotopes, B1:15–16 phase equilibria, B3:8–9 sulfur–iron–nickel system, B3:8–9 veins, A5:97 volume percentage in veins, A3:92
sulfur hydrothermal alteration, B1:10–11 peridotites, A6:28 sulfides, B3:4–5 vs. iron, B2:9 vs. nickel, B2:9 See also iron–nickel–sulfur–oxygen system
symplectite lithologic units, A9:4–7 photomicrograph, A1:122; A9:42–43
symplectite, clinopyroxene–spinel, photomicrograph, A1:122; A9:44, 55

T

taenite, iron–nickel–sulfur–oxygen system phase equilibria, A3:97
talc alteration veins, A3:17 hydrothermal alteration, A5:12; A6:10; A9:7–11; A10:13–17; B1:8–11 hydrothermal reactions, A9:11 magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 microprobe data, B2:1–13 photograph, A3:85; A5:86, 123; A10:90 photomicrograph, A1:89; A3:77–78, 80, 82; A5:85, 118, 137; A6:69, 87; A7:66, 68; A10:85, 92, 94 silica metasomatism, A3:18–20 ultramafics, A3:11 veins, A5:80, 87, 92, 97; A6:65, 71 volume percentage in veins, A3:92 X-ray diffraction data in serpentinized harzburgite, A3:76 See also olivine–amphibole–talc assemblage
talc, layered schistose, photomicrograph, A10:105
talc, massive nonpseudomorphic, photomicrograph, A3:61, 78, 94
talus, lithologic units, A7:3–4
talus pile, lithologic units, A7:2–3
tectonics mantle, B1:11–15 paleomagnetism, A1:21–23, 30–33, 39, 44, 52–53, 63–65
temperature igneous rocks, A10:41 mantle, A1:13–14 ocean bottom water, A9:27, 101 vs. depth, A10:150 vs. pressure, A1:132 vs. time, A3:154
temperature logs, anomalies, A3:48
tension gashes, photograph, A3:121–122
textures greenschist facies, A5:139 harzburgites, A7:5–6 mafic rocks, A7:2–8, 43 photomicrograph, A1:99–100 See also deformation textures; intergrowths; microtextures
textures, anastomosing photograph, A9:78 veins, A3:17–18
textures, anhedral, photomicrograph, A3:61–62
textures, coronitic, photomicrograph, A10:85
textures, deformation, photomicrograph, A5:130–131; A9:74, 76–77
textures, equant, variations in dunites and harzburgites, A9:54
textures, felty, lithologic units, A7:3
textures, fibrous, photomicrograph, A6:74
textures, high-temperature, photomicrograph, A7:82; A9:70
textures, high-temperature crystal-plastic, serpentine, A5:21–22
textures, hourglass photomicrograph, A3:74 ultramafics, A3:11
textures, igneous, photomicrograph, A5:62
textures, impregnation digital images, A6:88–89 photograph, A6:91–92
textures, intergranular basalts, A4:3 lithologic units, A6:5–6 petrology, A8:2
textures, interlocking photomicrograph, A3:75; A6:75 serpentinite, A7:8–9
textures, intersertal, basalts, A4:3
textures, interstitial, photomicrograph, A3:61–62, 66
textures, magmatic impregnation, A6:21–22 photomicrograph, A1:99–100
textures, mesh gabbros, A5:17 hydrothermal alteration, A6:12–13; A9:8–11 photomicrograph, A3:77; A5:109; A6:70; A7:64; A9:61–62, 78; A10:94 serpentinite, A7:7–9 silica metasomatism, A3:19 ultramafics, A3:11
textures, microcrystalline basalts, A4:3 petrology, A8:2
textures, mylonitic lithologic units, A5:9; A9:2–3 photomicrograph, A5:71–72
textures, ophitic, photomicrograph, A5:66
textures, paragranular, hydrothermal alteration, A5:15
textures, pegmatitic, photograph, A3:71
textures, poikilitic, lithologic units, A10:10
textures, polygonal, photomicrograph, A3:100
textures, "popcorn," photograph, A5:104
textures, porphyroclastic igneous rocks, A3:21–22 photograph, A3:129 photomicrograph, A3:64
textures, protogranular alteration, A8:3 deformation, A5:21–22; A9:12 harzburgites, A3:6; A7:14–15 igneous rocks, A3:21 lithologic units, A5:5–9; A6:5; A7:5; A9:6–7 photograph, A5:104; A7:80 photomicrograph, A3:64, 99–101; A5:105, 145; A7:82; A9:42–43, 69
textures, protogranular porphyroclastic, lithologic units, A5:4
textures, protointergranular igneous rocks, A3:21 photograph, A3:102 photomicrograph, A3:99–100; A6:81; A7:82
textures, pyroxenite, photograph, A3:101
textures, quench, photomicrograph, A7:48
textures, ribbon hydrothermal alteration, A5:15, 18; A6:12–13; A9:8–11 photomicrograph, A3:79, 109; A7:61; A9:77 ultramafics, A3:11
textures, serrate, photomicrograph, A3:81
textures, spinnifex-like, photomicrograph, A7:48
textures, strain, distribution and orientation, A10:22
textures, symplectic, residual peridotites, B1:7–8
textures, transgranular, photograph, A6:63
textures, vermicular, variations in dunites and harzburgites, A9:54
thermal boundary layer, plate tectonics, B1:14–15
thermal conductivity apparent anisotropy, A5:161–162, 180; A6:111; A7:104 histograms, A6:110; A7:103 igneous rocks, A3:38, 161; A5:40–41, 179; A6:32, 124; A7:26, 125; A9:21–22, 107; A10:28–29, 130, 160 peridotites, A9:92 peridotites and gabbros, A3:146; A5:160 vs. angle of the needle probe with core axis, A5:162 vs. bulk density, A7:105; A9:94 vs. depth, A3:142; A7:101; A9:90; A10:125–126
thermal conductivity, mean, vs. bulk density, A10:132
thermal conductivity anisotropy igneous rocks, A10:131 peridotites, A9:93
thermobarometry igneous rocks, B1:4–6 See also P–T conditions
thorium, peridotites, B1:17–18
thorium/lead ratio, peridotites, B1:17–18
thorium logs igneous rocks, A10:40 vs. depth, A7:120; A10:148
titanite hydrothermal alteration, A10:14–17 photograph, A10:80 photomicrograph, A10:78 X-ray diffraction data, A10:80
titanium peridotites, A3:34 See also iron/titanium ratio
titanium/vanadium ratio, igneous rocks, A10:26
titanium oxide amphibole, spinel, B4:5 diabase and basalt, A7:23 gabbroic rocks, A10:24 gabbros, A6:30–31 igneous rocks, A5:36–39; A10:26 peridotites, A3:34–35; A6:29; A7:22; A9:18–20 vs. aluminum oxide, A5:152; A6:105; A7:96; A9:88; A10:118 vs. chromium number, B4:15 vs. depth, B4:5, 19–20 vs. iron number, B4:16 vs. iron oxide, A5:155; A10:120 vs. magnesium oxide, A6:108; A7:97 vs. scandium, A10:123 vs. silica, A5:156 vs. vanadium, A5:157; A10:121 vs. zirconium, A5:157 See also iron–titanium oxides
titanomagnetite, vs. depth, A5:119
total spectral gamma ray logs, vs. depth, A10:148
trace elements alteration, A3:36–37 gabbros, A3:35–36 igneous rocks, A3:159–160; A5:34–39, 177–178; A6:122; A7:124; A9:106; A10:158–159 mineral separates, A6:123 peridotites, A3:34; A6:29; A7:22; A9:18–19; B1:16–18 residual harzburgites, B1:31
transform edge effect, peridotites, A1:10–11
transport, melts, A1:6–12
tremolite alteration, A8:3 calcium metasomatism, A3:20 hydrothermal alteration, A5:15; A9:7–11 magnesium–calcium–silicon–oxygen–hydrogen system, A6:77 photograph, A6:93 photomicrograph, A6:81 silica metasomatism, A3:18–20
tremolite, acicular–prismatic, hydrothermal alteration, A6:13
troctolites geochemistry, A10:22–23, 114–118 hydrothermal alteration, A6:15–16; A10:11–17 lithologic units, A6:4, 6–7; A10:4–10 metasomatism, A1:61 petrography, B4:3 photograph, A1:130; A6:55, 82; A10:50, 85, 93, 109 photomicrograph, A10:85, 93 physical properties, A10:125–126 stereo plots, A10:113 thermal conductivity, A6:110; A7:103
troctolites, altered photograph, A10:90, 95 photomicrograph, A10:95
trondhjemite geochemistry, A10:119–124 lithologic units, A10:3–10
twinning. See deformation twins
twinning, clinopyroxene, photomicrograph, A9:50
twinning, plagioclase, photomicrograph, A9:58, 76; A10:63

U

ultramafics alteration, A3:11, 23 demagnetization, A3:150 hydrothermal alteration, A7:7–9 lithologic units, A5:9 median destructive field, A3:151 photograph, A3:58 X-ray diffraction data, A9:103
ultramylonites intensity histograms, A10:100 intensity in cores, A5:111
ultramylonites, pseudomorphed, photograph, A3:107
uplifts, plate spreading geometry, B1:13–15
upwelling, mantle, A1:6–12
uranium peridotites, B1:17–18 residual harzburgites, B1:32
uranium/lead ratio, peridotites, B1:17–18
uranium logs igneous rocks, A10:40 vs. depth, A7:120; A10:148

V

vaesite, iron–nickel–sulfur–oxygen system phase equilibria, A3:97
vanadium gabbroic rocks, A10:25 gabbros, A6:30 igneous rocks, A5:37, 39; A10:26 peridotites, A3:34; A6:29; A7:22; A9:18–19 troctolites, A10:23 vs. aluminum oxide, A3:139; A5:152; A6:104, 107; A7:96; A9:87; A10:118 vs. scandium, A5:158 vs. titanium oxide, A5:157; A10:121 See also titanium/vanadium ratio
vein connectivity, histograms, A3:93
vein connectivity, branched, histograms, A3:93
vein connectivity, network, histograms, A3:93
vein connectivity, nonbranched, histograms, A3:93
vein connectivity, occasionally branched, histograms, A3:93
vein connectivity, single, histograms, A3:93
vein shape, irregular, histograms, A3:93
vein shape, kinked, histograms, A3:93
vein shape, sigmoidal, histograms, A3:93
vein shape, straight, histograms, A3:93
vein structure, banded, histograms, A3:93
vein structure, composite, histograms, A3:93
vein structure, mixed, histograms, A3:93
vein structure, uniform, histograms, A3:93
vein texture, histograms, A3:93
vein texture, cross-fiber, histograms, A3:93
vein texture, massive, histograms, A3:93
vein texture, mixed, histograms, A3:93
vein texture, slip-fiber, histograms, A3:93
veinlets, amphibole, photomicrograph, A10:89
veinlets, carbonate, photomicrograph, A10:95
veinlets, chrysotile, photomicrograph, A9:61
veinlets, serpentine–magnetite, photomicrograph, A9:61
veinlets, talc–pyrite, photomicrograph, A3:79
veins composition, A5:80, 87, 92, 97; A6:65, 71; A7:71 density, A3:32–33 Formation MicroScanner imagery, A10:153 gabbros, A3:16 harzburgites and dunites, A3:13–16 hydrothermal alteration, A9:8–11 intensity vs. depth, A3:124 mineralogy, A3:157; A5:176; A6:121; A7:123; A9:67, 104; A10:86, 97 mineralogy vs. depth, A7:70; A10:87, 98 photograph, A3:95, 129 photomicrograph, A3:94 pyroxenites, A3:16–17, 157 serpentinization, A3:17 shape histograms, A3:93 structure histograms, A3:93 talc alteration, A3:17 talc-altered lithologies, A3:16–17 timing and conditions of alteration, A3:17–18 timing of events, A3:96 volume percentage of minerals, A3:92 See also microveins
veins, alteration deformation, A6:25–26 description, A7:10–11 dip histograms, A3:125 dip vs. depth, A3:126; A5:27–28, 126; A7:85; A10:111 distribution and orientation, A10:20–21 gabbroic rocks, A3:27–28 gabbros, A5:27–28 generations, A9:15–16 harzburgites and dunites, A5:23, 31–32 igneous rocks, A7:16–17 intensity vs. depth, A6:98–99; A7:84; A9:72; A10:106, 108 orientation, A6:26 orientation with magnetic declination, A3:136 photograph, A6:45, 93; A7:83; A9:78–79; A10:109 stereo plots, A5:127, 132, 143–144 vs. depth, A3:124, 140; A5:124, 140
veins, amphibole lithologic units, A5:4 photograph, A10:88–89 photomicrograph, A6:85; A10:89
veins, amphibole ultramafic, photomicrograph, A5:55
veins, anastomosing deformation, A6:25–26 hydrothermal alteration, A6:13
veins, aragonite deformation, A6:25–26 generations, A9:10–11 hydrothermal alteration, A6:14 photograph, A5:100; A9:64
veins, bastite, photomicrograph, A3:94
veins, black–green serpentine, dip vs. depth, A7:85
veins, brown amphibole, genesis, A5:19–20
veins, brown clay–carbonate, photograph, A10:110
veins, brown clay–iron oxyhydroxide–carbonate, photograph, A10:110
veins, carbonate composition, A5:92 deformation, A6:25–26 dip vs. depth, A6:100; A9:80 generations, A9:10–11 genesis, A5:20 harzburgites and dunites, A5:17 photograph, A10:109 photomicrograph, A5:93
veins, carbonate–iron oxyhydroxide, photograph, A10:109
veins, chalcopyrite, photograph, A5:88
veins, chlorite volume percentage of minerals, A3:92 vs. depth, A3:91
veins, chlorite-rich, alteration, A3:16
veins, chrysotile dip vs. depth, A7:85 generations, A9:9–11 harzburgites and dunites, A5:16–17 hydrothermal alteration, A5:12 photograph, A6:93; A9:78–79 photomicrograph, A3:81, 94; A5:79, 90, 99 serpentinite, A3:11
veins, chrysotile–magnetite hydrothermal alteration, A5:12 photomicrograph, A3:75
veins, composite green/black serpentine dip vs. depth, A6:100 stereo plots, A6:101
veins, composite serpentine, photograph, A7:83
veins, crosscutting, photograph, A3:95
veins, crosscutting alteration, photograph, A10:110
veins, crosscutting magmatic, photograph, A10:109
veins, crosscutting serpentine, photograph, A7:83
veins, felsic hydrothermal alteration, A10:13–15 photograph, A10:91, 93, 110 photomicrograph, A10:93
veins, folded, photograph, A5:90
veins, gabbroic alteration, A3:12–13 digital images, A6:89 photograph, A3:122; A5:90, 107, 134–136, 142 photomicrograph, A6:84, 94
veins, ghost photograph, A3:95 photomicrograph, A3:94
veins, granophyre photomicrograph, A10:77–78 stereo plots, A10:112–113
veins, green amphibole–chlorite, photograph, A10:110
veins, green picrolite serpentine, photograph, A6:93
veins, hematite, harzburgites and dunites, A5:16–17
veins, iron oxyhydroxide, genesis, A5:20
veins, lizardite alteration, A3:27–28 photograph, A3:121, 127
veins, magmatic deformation, A6:20 dip vs. depth, A3:131 early series, A3:28–29 gabbroic intrusions, A3:29–30 intensity vs. depth, A3:123 orientation, A3:132; A6:22, 83 photograph, A3:101, 121; A10:109 pyroxenite and gabbro, A5:22, 29–30 stereo plots, A5:132
veins, magnetite photomicrograph, A3:74 textures, A5:21–22
veins, massive sulfide alteration, A3:13–14 dip histograms, A3:125 dip vs. depth, A3:126 volume percentage of minerals, A3:92
veins, massive talc alteration, A3:14–15 dip histograms, A3:125 dip vs. depth, A3:126 volume percentage of minerals, A3:92
veins, metamorphic alteration, A3:13–18 composition, A9:9–11 gabbros, A5:17 harzburgites and dunites, A5:16–17 hydrothermal alteration, A5:13–19; A6:11, 14; A10:13–15 photomicrograph, A5:84 vs. depth, A3:91
veins, mylonite gabbro, photomicrograph, A5:130
veins, mylonitic gabbroic/pyroxenitic, thin section image, A5:133
veins, oxide deformation, A6:25–26 photograph, A6:93 vs. depth, A3:91
veins, paragranular and transgranular chrysotile, vs. depth, A9:68
veins, paragranular serpentine, vs. transgranular serpentine veins, A5:102
veins, picrolite hydrothermal alteration, A6:14 photograph, A9:78–79; A10:109
veins, postkinematic pyroxenite, photograph, A3:105
veins, postkinematic serpentine, photograph, A3:105
veins, pyrite–hematite photograph, A3:95 photomicrograph, A3:94
veins, pyroxenite digital images, A6:89 hydrothermal alteration, A5:12 photograph, A3:104, 130; A5:134–136 photomicrograph, A5:59
veins, serpentine alteration, A3:15 dip histograms, A3:125 dip vs. depth, A3:126 generations, A9:9–11 harzburgites and dunites, A5:16–17 photograph, A3:95; A5:98, 100, 110, 136, 142; A6:93 photomicrograph, A3:81; A5:93, 99, 131; A9:77 stereo plots, A7:86 talc alteration, A3:16 volume percentage of minerals, A3:92
veins, serpentine–magnetite description, A7:10–11 dip vs. depth, A6:100; A9:80 generations, A9:9–11 photograph, A6:63, 93; A7:83; A9:79 photomicrograph, A3:74–75 stereo plots, A6:101
veins, serpentine–sulfide, photograph, A3:117
veins, sigmoidal fibrous chrysotile, description, A7:10–11
veins, sulfides photograph, A5:101 vs. depth, A3:91
veins, talc alteration, A3:16 hydrothermal alteration, A5:13 photograph, A5:88 photomicrograph, A3:81, 94; A10:95
veins, talc–chlorite, hydrothermal alteration, A5:14
veins, talc–pyrite alteration, A3:14 dip vs. depth, A3:126 photograph, A3:95 photomicrograph, A3:75 volume percentage of minerals, A3:92
veins, talc–serpentine dip vs. depth, A7:85 hydrothermal alteration, A5:12 photograph, A3:70, 83, 101, 130 vs. depth, A3:91
veins, transgranular, generations, A9:9–11
veins, transgranular serpentine, vs. paragranular serpentine veins, A5:102
veins, vuggy aragonite, description, A7:11
velocity cube samples, A3:163 discrete samples, A6:125 igneous rocks, A3:162; A5:41, 181–182; A6:33; A7:27–28, 126; A9:22, 108; A10:29–30, 161 See also compressional wave velocity; seismic velocity
velocity logs vs. depth, A7:34, 112; A10:148 See also compressional wave velocity logs; shear wave velocity logs; sonic velocity logs
velocity models, seismic refraction profiles, A1:82
vesicles imagery, A4:12 petrology, A8:2 population density vs. diameter, A4:13 size distribution, A4:3–4
viruses, bottom water, A3:170
volatiles, alteration, A3:36–37
volcanic glass geochemistry, A1:88, 103 photomicrograph, A4:11 See also glass rinds
volcanic glass, basaltic, photomicrograph, A8:8
volcanic glass, devitrified, lithologic units, A7:3

W

water, iowaite, A7:9
water content alteration, A3:36 diabase and basalt, A7:23 gabbroic rocks, A10:24 gabbros, A3:35 igneous rocks, A5:35 peridotites, A3:34; A6:28; A7:21 troctolites, A10:23 vs. magnesium oxide, A5:148; A9:84 vs. magnetic susceptibility, A3:141 vs. potassium oxide, A7:98 vs. silica, A3:137; A5:154; A6:106; A10:114
water, sterile, artificial seawater recipe, B5:32
weathering hydrothermal alteration, A6:10 igneous rocks, A5:35 photograph, A5:89, 95 photomicrograph, A9:74
weathering rinds, lithologic units, A7:2–3
weathering stains, joints, A7:12
wehrlites, lithologic units, A10:4–10
wireline logging, well-logging, A10:38–39

X

X-ray diffraction data igneous rocks, A3:156; A6:120; A10:156 mineralogy, A5:175 vein mineralogy, A7:122
xenocrysts lithologic units, A6:6–7 photograph, A6:55, 82
xenoliths lithologic units, A6:4 photograph, A6:55, 60, 82 photomicrograph, A6:60

Y

yttrium gabbroic rocks, A10:25 gabbros, A6:30 igneous rocks, A5:39; A10:27 peridotites, A3:34; A6:29 troctolites, A10:23 vs. zirconium, A5:158; A10:124 See also zirconium/yttrium ratio

Z

zeolites inclusions, A10:13 veins, A6:65
zircon igneous rocks, A10:27 lithologic units, A5:9 photomicrograph, A1:104; A5:76–77 provenance, B1:18
zirconium diabase and basalt, A7:24 gabbroic rocks, A10:25; B1:7 gabbros, A6:30 igneous rocks, A5:37, 39; A10:27 peridotites, A3:34; A6:29; A7:22; A9:18–19 troctolites, A10:23 vs. aluminum oxide, A3:139; A5:152; A6:105; A7:96; A9:88; A10:118 vs. magnesium number, A1:118, 137; B1:29 vs. magnesium oxide, A7:100 vs. strontium, A7:100 vs. titanium oxide, A5:157 vs. yttrium, A5:158; A10:124
zirconium/yttrium ratio, igneous rocks, A10:27
zoisite photomicrograph, A9:66 See also clinozoisite