SUBJECT INDEX

1/strontium ratio, vs. strontium isotopes, B7:15

A

acid sulfate alteration. See bleaching
aerobic culture, photomicrograph, A4:196
albite, geochemistry, B8:4–5
alkali earths, altered/parent rocks, B6:16
alkalinity, pore water, A4:48
alkalis altered/parent rocks, B6:16 rhyodacite, A6:8 See also sodium oxide + potassium oxide
alteration breccia, A4:41–44 classification, B1:18, 62 Formation MicroScanner imagery vs. depth, A4:221 geochemistry, A3:69, 71; A4:47–48; B1:46–49; B8:1–18 hydrothermal fields, A1:7 mass transfer, B1:64 mineralization, B1:27–28 permeability, B13:5–9 photograph, A1:51–52, 75; A3:142–143, 150; A4:69, 132, 172, 185 photomicrograph, A1:81; A3:141, 147, 152; A4:98; B6:15 summary, A6:35; B1:8, 36–38 summary and types, A3:278; A4:24, 233–234, 236–239 volume expansion, B1:59 xenoliths, B6:3 See also anhydrite-pyrite-pyrophyllite alteration; bleaching; chlorite-hematite alteration halo; chlorite-pyrite alteration; cristobalite-clay alteration; green silica-clay alteration; hydrothermal alteration; illite-chlorite alteration; metasomatism; potassium feldspar-illite alteration; silica-chlorite alteration; silica-clay alteration; silicification; wallrock alteration
alteration, silica-clay, photograph, A4:76–77
alteration, silica-sulfate, photograph, A4:174
alteration films, iron oxyhydroxide, A3:37
alteration halos lithologic units, A6:5–6 photograph, A3:110, 121, 145, 159, 167, 201, 208, 211, 219–220; A4:93–94, 133 photomicrograph, A1:54; A3:146, 149, 205–206, 212; A4:122, 125–126, 175–176 veins, A3:62–63; A4:42–45 See also chlorite-hematite alteration halo
alteration style, vs. depth, A1:49–50, 66–67; A3:36–37, 137–138; A4:24–25, 114–116; B11:7–9
alteration types, mineralogy, B8:14–16; B12:1–19
altered rocks algorithms for precursor composition, B1:70 geochemistry, B1:18–20, 46–49 volume change, B1:20
aluminum, altered rocks, B1:47
aluminum oxide alteration, A4:47–48 dacite lava, B2:8 vs. depth, A3:223; A4:191, 193 vs. silica, B2:21 xenoliths, B6:2
alunite hydrothermal alteration, B1:16 photomicrograph, A3:169
amphibole, lithologic units, A4:14
amygdules distribution and types, A3:276 lithologic units, A3:26–33; A4:18 photomicrograph, A1:45; A3:129, 134, 166; A4:123, 151, 163
amygdules, chlorite, photomicrograph, A4:103
amygdules, elongate, photograph, A3:126
amygdules, quartz, photomicrograph, A4:127
amygdules, quartz-pyrite, photomicrograph, A3:162; A4:99, 125–126
amygdules, quartz-sphalerite, photomicrograph, A4:100
anaerobic culture, photomicrograph, A4:197
anatase, hydrothermal alteration, B1:16
andesite, lithology, A1:4
anhydrite alteration, A3:51; B1:21 amygdules, A3:29–30 bleaching alteration, A3:39–41 fresh and altered dacite, B12:3–4 geochemistry, B7:1–23 hydrothermal alteration, B1:15 lithologic units, A4:15–41 photograph, A1:58–60; A3:106, 111, 151; A4:69, 90, 182–183 photomicrograph, A1:45, 57, 68; A3:139, 182, 197; A4:122, 128–129, 161, 164, 171; B1:56; B6:15; B8:10; B9:25 semimassive sulfides, B1:22–23 separates from hydrothermal veins and vug fills, B7:16–23 strontium and sulfur isotopes, B1:30–32 veins, A1:26; A3:59–65 vs. depth, A3:171; A4:117 xenoliths, B6:3
anhydrite, anhedral, photomicrograph, B6:14
anhydrite-pyrite-pyrophyllite alteration, geochemistry, B8:1–18
anhydrite crystals, photomicrograph, A4:198
anhydrite intergrowths, photomicrograph, B6:14
anhydrite matrix, photomicrograph, A4:105
anhydrite overgrowths, photomicrograph, A4:140
anisotropy, magnetic susceptibility, A3:237, 301; A4:209, 259; A6:11, 31, 45
anorthite geochemistry, B8:4–5 plagioclase, B2:25
antimony altered rocks, B1:49 jasperoids, B9:6 pore water, B4:4–5
apatite hydrothermal alteration, B1:16 jasperoids, B9:5
apophysis, photograph, A4:91
arsenic altered rocks, B1:49 galena, B3:3 jasperoids, B9:6 pyrite, B3:3
autobrecciation, photograph, A3:124

B

backarc basins, geology, A1:1–84
bacteria biomineralization, B1:35–36 dacite, A6:26 photomicrograph, A4:196–198 total enumeration, A3:72; A4:49, 250–251; A6:9, 39
bacteria, mineralized, bacterial habitation, A3:226
bacterial counts, data, A3:294
bacterial habitation mineral particles, A3:225–226 photomicrograph, A4:198–199
barite lithologic units, A4:34 massive sulfides, B10:5–7 photomicrograph, A4:140 semimassive sulfides, B1:22–23 strontium and sulfur isotopes, B1:31–32
barium altered rocks, B1:18–20, 36–37, 47–48 chimneys, B1:35 jasperoids, B9:5 massive sulfides, B10:3–7 pore water, B4:4 vs. depth, A3:224; A4:192, 194
basalt geochemistry, B6:3–4, 19 lithology, A1:4 photomicrograph, B6:7–15 xenoliths, B6:1–19
bathymetry, maps, A1:34; B1:51; B2:15
biomass, data, A3:294
biomass activity, bacteria, A3:72; A4:49–50
biomineralization, biosphere, B1:35–38
biosphere, biomineralization, B1:35–38
Bismarck Sea, geology, A1:1–84
bismuth altered rocks, B1:49 jasperoids, B9:6 massive sulfides, B10:4 pore water, B4:4 semimassive sulfides, B1:23
black patches lithologic units, A4:14 photomicrograph, A4:82–85
black smokers, hydrothermal fields, A1:5–7
bleaching alteration, A3:39–41, 51; A4:27–29 geochemistry, B1:27 hydrothermal alteration, B1:16–17 petrology, A5:5–6 photograph, A1:52; A3:108, 110, 144, 150–151, 153, 201; B1:57
borehole images, logging-while-drilling data, A3:90–91
boreholes casing, A3:99 photograph, A3:99–100
bornite, semimassive sulfides, A4:39
boron, pore water, B4:4
breccia alteration, A1:27; B1:21 dilation, B1:28–29 green silica-clay alteration, A3:38–39 photograph, A1:75; A4:134, 170, 180 structure, A4:41–44 See also granule breccia; pebble breccia; pseudobreccia
breccia, altered, photomicrograph, A4:141
breccia, altered polymict, lithologic units, A4:17–23
breccia, autoclastic, photograph, A4:91
breccia, clast-supported, photograph, A4:181
breccia, flow-banded volcanic, photomicrograph, B8:11–12
breccia, flow-top, volcanism, B1:9–11
breccia, hydrothermal lithologic units, A3:25–26; A4:10–23 photograph, A4:69, 74–75 photomicrograph, A4:82
breccia, jigsaw lithologic units, A3:24, 31 photograph, A4:135, 172, 182
breccia, matrix-supported lithologic units, A4:15–23 photograph, A4:87, 131, 180
breccia, mineralized pumice, photomicrograph, B8:11
breccia, monomict volcaniclastic, lithologic units, A4:21, 31–32
breccia, polymict volcanic, photomicrograph, B8:11, 13
breccia, polymict volcaniclastic lithologic units, A4:13, 21, 32 photograph, A4:96, 138 photomicrograph, A4:109
breccia, volcanic, photomicrograph, B8:8–13
breccia, volcaniclastic alteration and mineralization, A4:13, 21 lithologic units, A3:24–25; A4:16–23 photograph, A4:90, 92 photomicrograph, A4:8; B8:9
breccia cement, jasperoidal silica, photomicrograph, A4:130
breccia flows, volcanism, B1:9–12
brecciation jasperoids, B9:6–7 microfractures, B9:4–7 photograph, A3:124; A4:172 See also autobrecciation
brecciation, hydrothermal, photograph, A4:113
brucite hydrothermal alteration, B1:16 photomicrograph, A3:169
Brunhes/Matuyama boundary, oceanic crust, A1:4–5
bulk density logs, vs. depth, A4:217, 226

C

cadmium jasperoids, B9:6 pore water, B4:4–5
calcium jasperoids, B1:48; B9:5–7 massive sulfides, B10:3–7 pore water, B4:4–7 xenoliths, B6:3 See also potassium/calcium ratio
calcium oxide alteration, A3:69; A4:47–48 dacite lava, B2:8 massive sulfides, B10:3–7 vs. depth, A3:223; A4:191, 193 vs. europium/europium ratio, B2:24 vs. silica, B2:21
caliper logs, vs. depth, A3:256; A4:217, 226
carbon dioxide, hydrothermal fields, A1:6–7
Category Z, wallrocks, B1:21, 28
cations, sulfate, A3:287
cavities, miarolitic, photomicrograph, B6:7–8, 10
cavity linings, photomicrograph, B9:23
celadonite, lithologic units, A4:14
cement, anhydrite, photograph, A4:170
cement, anhydrite-quartz-pyrite, photograph, A4:131
cement, pyrite, photograph, A4:170
cement, quartz, photograph, A4:170
cerium, pore water, B4:5
cesium, jasperoids, B1:47; B9:5
chalcophile elements altered/parent rocks, B6:17 altered rocks, B1:48–49
chalcopyrite chemical composition, B3:15–17 chloritized zones, B3:3 lithologic units, A4:15–41 massive sulfides, A4:36; B1:6; B10:4–7 petrography, A3:54, 57 photograph, A1:71; A4:144 photomicrograph, A1:55; A3:183, 188; A4:145, 151–154, 166 semimassive sulfides, B1:22–23 vs. depth, A4:117
chalcopyrite disease, photomicrograph, A4:156–157, 164
chalcopyrite fills, photomicrograph, A4:160–161
chemosynthesis, hydrothermal fields, A1:7
chert, hematitic, photomicrograph, A4:154
chimneys hydrothermal fields, A1:5–7; B1:6 metal sources, B1:33–35 sulfides, A1:23–28; B1:28
chlorite alteration phases, B5:1–10; B11:1–19 breccia, A4:41–44 geochemistry, B8:5 hydrothermal alteration, B1:14–16 hydrothermal event frequency, B1:24–25 lithologic units, A3:26–33; A4:24–41 photograph, B1:57 photomicrograph, A3:166; A4:101; B1:56 silicification alteration, A3:41–47 vs. depth, B5:5–6 xenoliths, B6:3 See also illite-chlorite alteration; silica-chlorite alteration
chlorite-hematite alteration halo, photomicrograph, A3:149
chlorite-pyrite alteration, geochemistry, B8:1–18
chlorite intergrowths, photomicrograph, B6:14
chrome spinel photomicrograph, B6:8 xenoliths, B6:2
chromite chemical composition, B3:27 mineralization, B3:4
chromium, xenoliths, B6:3
chromium oxide, xenoliths, B6:2
clastic zones lithologic units, A3:32 photograph, A4:113
clasts abrasion, A4:138 bleaching alteration, A3:39–41 hydrothermal event frequency, B1:24–25 lithologic units, A3:21–33 movement, A3:25; A4:13 photograph, A3:111–112, 116, 151; A4:87, 92, 113, 131 photomicrograph, A3:135–136, 163
clasts, altered perlitic, photomicrograph, A4:105
clasts, altered volcanic, lithologic units, A4:15–23
clasts, bleached, photograph, A4:96, 138
clasts, chalcopyrite-sphalerite, photomicrograph, A4:139
clasts, glassy, photomicrograph, A4:112
clasts, perlitic photograph, A4:96, 138 photomicrograph, A4:112
clasts, porous, photograph, A4:96, 138
clasts, porphyritic, photomicrograph, A4:112
clasts, spherulitic, photomicrograph, B8:13
clasts, tube pumice, photomicrograph, A4:103
clasts, vitric, photomicrograph, A3:117–118
clasts, volcanic photograph, A4:78–79, 90–92, 118, 134, 138 photomicrograph, A1:68, 72; A4:80–81, 104, 107–109
clay alteration, A3:26; B11:1–19 amygdules, A3:29–30 photomicrograph, A6:17 vs. depth, A3:171; A4:117 xenoliths, B6:3 See also cristobalite-clay alteration; green silica-clay alteration; silica-clay alteration
clay intergrowths, photomicrograph, B6:14
clay mineralogy, alteration phases, B5:1–10
clay minerals chimneys, A1:25 hydrothermal alteration, B1:13–16 lithologic units, A6:5 no bacterial habitation, A3:227 photograph, A3:125, 151, 159, 211 photomicrograph, A3:135–136, 212; A4:101, 106, 196–197; B1:56
clinopyroxene mineral chemistry, B2:8–9 photograph, A1:77 xenoliths, B6:2–3
clinopyroxene phenocrysts lithologic units, A4:12, 18; B2:5 petrology, A5:4; A6:4 photograph, A5:7 photomicrograph, A1:78; A4:98; A5:8; B2:18
clinopyroxene phenocrysts, euhedral, photomicrograph, B2:16, 19
cobalt altered rocks, B1:49 jasperoids, B9:6 massive sulfides, B10:4 pore water, B4:5
compressional wave velocity altered volcanic rocks, A3:76; A4:54, 255 rhyodacite, A6:10, 41 rocks, A3:296 vs. depth, A3:230; A4:202
compressional wave velocity logs measurements, A3:94 vs. depth, A3:256; A4:217
conductive minerals Formation MicroScanner imagery vs. depth, A4:220 resistivity-at-the-bit, A4:229
contamination, microorganisms, A3:74
convergence, volcanism, A1:3–5
copper altered rocks, B1:19, 37, 48–49 chimneys, B1:35 jasperoids, B9:6 massive sulfides, B10:3–7 pyrite, B3:3 semimassive sulfides, B1:23 vs. depth, A3:224 vs. depth in altered volcanics and in precursors, B1:69
copper sulfides, semimassive sulfides, A4:39
covellite, semimassive sulfides, A4:39
cracks, perlitic, photomicrograph, A3:117–119, 142; A4:102
cracks, photograph, A1:46
cristobalite alteration, A3:38; B11:1–19 bleaching alteration, A3:40 domain significance, B1:25–26 hydrothermal alteration, B1:14 hydrothermal event frequency, B1:25 lithologic units, A4:24–41 photomicrograph, A3:131–132, 205–206; B1:56 silicification alteration, A3:42–47 veins, A3:59–65 vs. depth, A4:117
cristobalite-clay alteration lithologic units, A6:5–6 photomicrograph, A1:81; A3:164; A6:19
cristobalite–quartz transition, lithologic units, A4:33–34
crust, oceanic, Brunhes/Matuyama boundary, A1:4–5
crystal aggregates, photomicrograph, A3:131–132
CSIRO sample 142421, xenoliths, B6:1–19
cultivation enrichment, A3:295; A4:51–52, 252–254 observations, A4:195

D

dacite alteration, A3:36–51 bacteria, A6:26 bacterial habitation, A3:225 geochemistry, A4:47; B6:19; B8:1–18 hydrothermal fields, A1:7 lithology, A1:4 petrology, B2:4–8 photograph, A1:77; A5:7 volcanism, B1:10–12
dacite, altered geochemistry, B8:1–18 hydrothermal minerals, B8:16 photograph, A3:172 photomicrograph, A1:45; A3:175–176
dacite, altered perlitic, photomicrograph, B8:7
dacite, amygdaloidal, photomicrograph, B8:8–9
dacite, aphyric alteration, A4:26–41 photograph, A3:104 photomicrograph, B8:9
dacite, aphyric glassy, lithologic units, A4:9–23
dacite, bleached, photomicrograph, B8:7
dacite, brecciated, photomicrograph, B8:10
dacite, coherent, photomicrograph, B8:9
dacite, flow-banded, photomicrograph, B8:8, 12
dacite, fresh and altered, interlaboratory analyses, B12:1–9
dacite, porphyritic, alteration films, A3:37
dacite, pseudoclastic veined, photomicrograph, B8:8
dacite, spherulitic, photomicrograph, B8:8
dacite, unaltered, volcanism, B1:11–12
dacite, unaltered feldspar-phyric coherent, photomicrograph, B8:13
dacite, veined coherent, photomicrograph, B8:11
dacite, vesicular petrology, A5:4–5 photomicrograph, B8:7
dacite, vesicular aphyric coherent, photomicrograph, B8:13
dacite/rhyolite boundary, geochemistry, B2:8
dacite lava, petrology and geochemistry, B2:1–31
deep resistivity logs images, A3:253–254 vs. depth, A3:256; A4:217, 226
Deinococcus sp. n. ssp., biomineralization, B1:36
demagnetization, alternating-field, Zijderveld plots, A3:240–241
demagnetization, thermal curves, A3:83–84, 246; A4:58–59, 215; A6:33, 46 rhyodacite, A6:12
demagnetization, Zijderveld plots, A4:212
density, bulk, altered volcanic rocks, A3:76–77
density, grain altered volcanic rocks, A3:76–77; A4:257 rhyodacite, A6:43 rocks, A3:299 vs. depth, A3:232; A4:204
density logs measurements, A3:93–94; A4:61, 64 vs. depth, A3:256 See also bulk density logs
devitrification lithologic units, A3:24 photograph, A3:123 photomicrograph, A3:113, 115; A4:107 silicification alteration, A3:44–47
diaspore, hydrothermal alteration, B1:16
diffusion, alteration, A1:26
dilation, hydrothermal systems, B1:28–29
dip histogram in volcanic layering, A3:202 orientation, A3:58–59 primary layering, A6:7, 21 volcanic rocks, A4:41, 43
dip, primary volcanic layering, vs. depth, A4:169, 179; A6:21
dip, vein vs. depth, A3:204; A4:178, 190; A6:23 vs. dip, A3:222
dipping units, Formation MicroScanner imagery vs. depth, A4:222
Djaul transform fault, lithology, A1:4
domains bacterial habitation, A3:225 photograph, A3:127–128 photomicrograph, A3:131–133, 135–136, 164
downhole measurements, A1:17, 21; A3:86–96; A4:59–65
dufreynosite, massive sulfides, B10:4

E

East Sherburne volcanic zone, volcanism, A1:5
electrical conductivity, fluid flow, B1:30
electron probe data, sulfides and oxides, B3:7–8
enrichment cultures, microorganisms, A3:72–73; A4:50; A6:9, 40
Eocene–Oligocene transition, volcanism, A1:3–5
epifluorescence, photomicrograph, A4:196–197
erbium, fresh and altered dacite, B12:4
europium altered rocks, B1:48 dacite lava, B2:8
europium/europium ratio vs. calcium oxide, B2:24 vs. silica, B2:24 vs. strontium, B2:24 vs. strontium isotopes, B7:15
exopolymeric clusters bacterial habitation, A3:226 photomicrograph, A4:199
exsolution laths, photomicrograph, A3:189
extension normal faults, A1:33 veins, A3:63–64

F

fabric fluid flow, B1:30 photomicrograph, B9:18 xenoliths, B6:2–3 See also microfabric
fault scarps, lithology, A1:4; A4:22
fault zones, Formation MicroScanner imagery vs. depth, A4:223
faults, normal, extension, A1:33; B1:5
faults, rift, lithology, A1:4
faults, transform, volcanism, A1:4–5
feldspar, photomicrograph, A4:109
feldspar microcrysts, petrology, A6:4
feldspar needles, photomicrograph, A3:113
fissure eruptions, lithology, A1:4
fissures, hydrothermal fields, A1:5–7
flaky particles, bacterial habitation, A3:226
flow banding groundmass, B2:7 lithologic units, A3:24, 31; A4:12, 19–20 petrology, A5:5 photograph, A1:48, 70; A3:107, 109, 143, 201; A4:72, 74–75, 89–93, 118, 134–138, 181–183, 185 photomicrograph, A3:148, 205–206; A4:82, 106–108, 119, 171; A5:9; B2:18
flow banding, folded, photograph, A3:200; A4:138
flow banding, laminar, photograph, A3:116
flow banding, relict, photograph, A3:125
flow laminations photograph, A3:154 photomicrograph, A3:155
flow structures, photograph, A3:126
fluid flow alteration, A1:26 geochemistry, B1:26–27 lithologic units, A3:25–26, 32; A4:32 models, B1:32–33 permeability, B13:5–9 sources, B1:29–35
fluid flux, alteration, A3:48–51
fluid inclusions fluid flow, B1:33 massive sulfides, B10:7 photomicrograph, A3:139, 218; B9:24 temperature, B1:24
fluid temperature, hydrothermal fields, A1:6–7
fluid venting, permeability, B13:5–9
fluorine, hydrothermal fields, A1:6–7
folds orientation, A3:58–59 photograph, A1:48; A3:109
folds, isoclinal, lithologic units, A3:24, 31
foliation, vs. lineation, A4:209; A6:31
formation evaluation geochemical logs, A3:95–96 logging, A4:62, 64–65 logging-while-drilling data, A3:89–90 well-log units, A3:95–96
Formation MicroScanner imagery formation evaluation, A3:96 vs. depth, A3:259–261; A4:62, 65, 220–224 vs. resistivity-at-the-bit, A1:76; A4:65, 230
Formation MicroScanner imagery logs, vs. depth, A3:256; A4:217
fractures alteration, B1:21 bleaching alteration, A3:39–41 dilation, B1:28–29 fluid flow, B1:29–30 Formation MicroScanner imagery vs. depth, A3:260–261; A4:65, 221, 223–224 photograph, A1:48; A3:109–110, 153, 159; A4:70 photomicrograph, B9:14 veins, A3:59–65 See also microfractures

G

gadolinium, fresh and altered dacite, B12:4
galena chemical composition, B3:19 groundmass, B3:3 massive sulfides, A4:36; B10:5–7 parageneses, A4:159 photomicrograph, A4:152–153
gamma ray logs measurements, A3:93; A4:60–61, 64 vs. depth, A3:250, 256; A4:217 vs. resistivity-at-the-bit logs, A3:252
gamma rays altered volcanic rocks, A3:75; A4:53–54 rhyodacite, A6:10 vs. depth, A3:229; A4:201; A6:28
Geobacillus sp. n. ssp., biomineralization, B1:36
geochemical logs, formation evaluation, A3:95–96
geochemistry altered dacite, B8:1–18 anhydrite, B7:1–23 dacite lava, B2:1–31 dacite/rhyolite boundary, B2:8 fluid flow, B1:26–27 jasperoids, B9:1–30 massive sulfides, B10:1–22 pore water, B4:1–15 Site 1188, A1:16; A3:65–71 Site 1189, A1:20; A4:46–48 Site 1190, A5:6 Site 1191, A1:23; A6:8 volcanism, B1:9–11 xenoliths, B6:3–4
geochemistry, bulk-rock altered rocks, B1:18–20 dacite lava, B2:26–29, 31
geology, seafloor, basins, A1:37
geothermal gradient, hydrothermal fields, A1:7
germanium, jasperoids, B9:6
glauconite, lithologic units, A4:14
goethite jasperoids, B9:5 lithologic units, A6:5
gold chemical composition, B3:20–23 mineralization, B3:4 pyrite inclusions, B3:22 sphalerite inclusions, B3:20 void fillings or vesicle linings in quartz, B3:21 See also native gold
grabens, Brunhes/Matuyama boundary, A1:4–5
granule breccia, lithologic units, A3:21–33
granules, photomicrograph, A4:123
gray smokers, hydrothermal fields, A1:5–7
green silica-clay alteration petrology, A3:38–39, 49–51; A4:24–27 photograph, A4:118 photomicrograph, A4:119–120
greigite, alteration, A6:6
groundmass microcrysts, A5:5 petrology, A6:4 photomicrograph, B2:16–17 volcanic glass, B2:5–8
groundmass, quartz-clay, photomicrograph, A4:127
groundmass, quartz-illite, photomicrograph, A3:129, 162
groundmass, siliceous, photograph, A3:127
gypsum lithologic units, A4:34 photomicrograph, A1:68; A4:129
gypsum matrix, photomicrograph, A4:105

H

halloysite lithologic units, A3:30 photomicrograph, A3:161
helium, hydrothermal fields, A1:6–7
hematite alteration, A3:50; A4:37 hydrothermal alteration, B1:15 lithologic units, A6:5 mineralization, B3:4 parageneses, A4:159 petrography, A3:55 photograph, A4:96, 138 photomicrograph, A3:169, 180, 183, 186–187, 191, 193, 205–206; A4:83, 130, 158, 167; B9:12–13, 18–21 quartz inclusions, B9:4–7 See also chlorite-hematite alteration halo
hematite, bladed, photomicrograph, A4:166
hematite flakes, photomicrograph, B9:18, 22
hematite fronds, photomicrograph, B9:22–23
hercynite chemical composition, B3:29 hydrothermal alteration, B1:15–16 mineralization, B3:4 photomicrograph, A3:168 xenoliths, B6:2
holmium, fresh and altered dacite, B12:4
hyaloclastite, semimassive sulfides, B1:22–23
hydrofracture, microfractures, B9:4–7
hydrothermal alteration photomicrograph, A3:119 Site 1188, A1:14; A3:33–51 Site 1189, A1:18–19; A4:23–34 Site 1190, A1:22; A5:5–6, 11 Site 1191, A1:22; A6:4–6 temperature, B1:23–24 See also alteration; metasomatism; silicification
hydrothermal alteration, subseafloor, mineralization, B1:12–29
hydrothermal deposits, distribution map, A1:38
hydrothermal fields, geology, A1:5–7
hydrothermal fluids, phase separation, B1:29
hydrothermal systems dilation, B1:28–29 distribution map, B1:53 event frequency, B1:24–25 mineral chemistry, B3:1–31 permeability, B13:1–19
hydrothermal systems, felsic-hosted active systems, B1:1–71 dacite lava, B2:1–31

I

igneous petrology Site 1188, A3:19–33 Site 1189, A4:8–22 Site 1190, A5:3–5 Site 1191, A6:3–4
igneous phases, remnant, vs. depth, A3:137–138; A4:114–116; B11:7–9
igneous rocks petrography, A1:14, 18, 21–22 vs. depth, A1:49–50, 66–67
illite alteration phases, B5:1–10; B11:1–19 composition (position of AlOH absorption) vs. depth, B5:7–8 geochemistry, B1:26–27 hydrothermal alteration, B1:14–16 hydrothermal event frequency, B1:24–25 lithologic units, A3:30; A4:24–41 paragonitic to potassic composition, B5:3 photomicrograph, A1:53; A3:160–161, 163, 165; B1:56 silicification alteration, A3:41–47 vs. depth, B5:5–6 See also potassium feldspar-illite alteration
illite-chlorite alteration, photograph, B1:57
ilmenite chemical composition, B3:28 hydrothermal alteration, B1:15–16 mineralization, B3:4 photomicrograph, A3:189–190, 193; B6:8–9 xenoliths, B6:2
inclusions alteration, A3:50 gold, B3:4 hematite, B9:4–7 magnetite, A4:36 photomicrograph, A1:56; A3:179, 183–188, 193–198, 218; A4:152–153, 156; B9:12–23 pyrrhotite, B3:3 spinel, B3:4 See also melt inclusions
inclusions, vermicular, photomicrograph, A3:177–178
index properties altered volcanic rocks, A3:76–77; A4:54–55, 256; A5:15 rhyodacite, A6:10–11, 42 rocks, A3:297–298 volcanic rocks, A5:6
indium, jasperoids, B9:6
Indo-Australian plate, subduction zones, A1:3–5
intergrowths, photomicrograph, A3:190
intrusions, synvolcanic, photograph, A4:91
iron alteration, A3:50, 69 altered rocks, B1:47 jasperoids, B9:5–7 massive sulfides, B10:3–7 pore water, B4:4 vs. manganese, B4:12 See also manganese/iron ratio; silicon/iron ratio
iron-manganese-silica deposits, jasperoids, B1:6; B9:7, 27, 29
iron oxide alteration, A3:71; A4:40, 47–48 dacite lava, B2:8 massive sulfides, B10:3–7 photomicrograph, A4:108 silicification alteration, A3:43–47 vs. depth, A3:223; A4:191, 193 vs. silica, B2:21
iron oxyhydroxide altered rhyodacite, A3:37 hydrothermal fields, A1:5–7
iron spinel. See hercynite

J

jasperoids petrography and geochemistry, B9:1–30 photograph, B9:10–11, 17 photomicrograph, B9:12–16, 18–25
Jaulu volcanics, lithology, A1:4

K

kaolinite, hydrothermal alteration, B1:16
kernels geochemistry, B1:26–27, 47 photograph, B1:57

L

lamellae, photomicrograph, A3:180
lanthanum altered rocks, B1:48 pore water, B4:5
lanthanum/samarium ratio, vs. strontium isotopes, B7:15
lava photograph, A4:91 Tsukushi group, B1:12
lava, felsic, alteration, A1:26
lava, glassy, volcanism, B1:10–12
lava, unaltered felsic, volcanism, B1:11–12
lava flows, vesicular, lithology, A4:22
lava groups, distribution, B1:52
layers, orientation, A3:58–59
lead altered rocks, B1:19–20, 49 chimneys, B1:35 galena, B3:3 jasperoids, B9:6 massive sulfides, B10:3–7 pore water, B4:4 vs. depth in altered volcanics and in precursors, B1:69
lead isotopes, massive sulfides, B10:4, 12
Leg 193, coring summary, A1:84
Lelet limestone, lithology, A1:4
Liesegang zoning, xenoliths, B6:3
lineation photomicrograph, A4:85 primary layering, A6:7, 22 vs. foliation, A4:209; A6:31
lithium altered rocks, B1:19 jasperoids, B9:5 pore water, B4:4
lithofacies, volcanism, B1:9–11
lithologic units lithology and alteration, A3:265–268, 270–275 Site 1189, A4:9–11; A6:3–5 Unit 1, A3:21–33; A4:9, 15 Unit 2, A3:21–33; A4:9–10, 15 Unit 3, A3:21–33; A4:10, 15 Unit 4, A3:21–33; A4:10, 15 Unit 5, A3:21–33; A4:10, 15–16 Unit 6, A3:21–33; A4:10, 16 Unit 7, A3:21–33; A4:10, 16 Unit 8, A3:21–33; A4:10, 16 Unit 9, A3:21–33; A4:10, 16 Unit 10, A3:21–33; A4:10, 16 Unit 11, A3:21–33; A4:10, 16 Unit 12, A3:21–33; A4:10, 16 Unit 13, A3:22–33; A4:10, 16 Unit 14, A3:22–33; A4:10, 16 Unit 15, A4:10 Unit 16, A3:22–33; A4:10–11, 16 Unit 17, A3:22–33; A4:11, 16 Unit 18, A3:22–33; A4:16 Unit 19, A3:22–33; A4:11, 16 Unit 20, A3:22–33; A4:11, 16 Unit 21, A3:22–33; A4:11, 16 Unit 22, A3:22–33; A4:11, 16 Unit 23, A3:22–33; A4:11, 16–17 Unit 24, A3:22–33; A4:11, 17 Unit 25, A4:17 Unit 26, A4:17 Unit 27, A3:26–33; A4:17 Unit 28, A3:26–33; A4:17 Unit 29, A3:26–33; A4:17 Unit 30, A3:27–33; A4:17 Unit 31, A3:27–33; A4:17 Unit 32, A3:27–33; A4:17 Unit 33, A3:27–33; A4:17 Unit 34, A3:27–33; A4:17 Unit 35, A3:27–33; A4:17 Unit 36, A3:27–33; A4:18 Unit 37, A3:27–33 Unit 38, A3:27–33 Unit 39, A3:27–33 Unit 40, A3:27–33 Unit 41, A3:27–33 Unit 42, A3:27–33 Unit 43, A3:27–33 Unit 44, A3:27–33 Unit 45, A3:27–33 Unit 46, A3:28–33 Unit 47, A3:28–33 Unit 48, A3:28–33 Unit 49, A3:28–33 Unit 50, A3:28–33 Unit 51, A3:28–33 Unit 52, A3:28–33 Unit 53, A3:28–33 Unit 54, A3:28–33 Unit 55, A3:28–33 Unit 56, A3:28–33 Unit 57, A3:28–33 Unit 58, A3:28–33 Unit 59, A3:28–33 Unit 60, A3:28–33 Unit 61, A3:28–33 Unit 62, A3:28–33 Unit 63, A3:28–33 Unit 64, A3:28–33 Unit 65, A3:28–33 Unit 66, A3:28–33 Unit 67, A3:28–33 Unit 68, A3:29–33 Unit 69, A3:29–33 Unit 70, A3:29–33 Unit 71, A3:29–33 Unit 72, A3:29–33 vs. depth, A1:49–50, 66–67; A3:137–138; A4:114
lithology dacite lava, B2:31 Site 1188, A1:40–42; A3:102, 120 Site 1189, A1:62–63; A4:68, 86 Site 1190, A5:11 summary, A4:233–234, 236–239; A6:35
lithophile elements, altered rocks, B1:47–48
lithophysae, lithologic units, A3:31
logging-while-drilling data borehole images, A3:90–91 formation evaluation, A3:89–90 temperature, A3:87
loss on ignition, jasperoids, B9:5

M

macrofauna, hydrothermal fields, A1:7
maghemite, photomicrograph, A3:180
magma lobes, xenoliths, B6:4–5
magnesium alteration, A3:50, 69 altered rocks, B1:19–20, 47 pore water, B4:4–7 vs. depth in altered volcanics and in precursors, B1:67
magnesium ion, geochemistry, B1:27
magnesium oxide alteration, A3:69, 71 dacite lava, B2:8 vs. depth, A3:223; A4:191, 193 vs. silica, B2:21 xenoliths, B6:3–4
magnetic fabric, magnetic susceptibility, A3:237
magnetic foliation, magnetic susceptibility, A3:237
magnetic inclination, vs. depth, A3:239
magnetic inclination, stable, vs. depth, A4:57, 211
magnetic intensity isothermal remanent magnetization, A3:81–83; A4:57–58, 213 natural remanent magnetization, A3:79; A4:56, 210; A6:11–12, 32 vs. depth, A6:32 vs. temperature, A3:246
magnetic intensity, backfield isothermal remanent magnetization, vs. applied impulse field, A3:245; A4:214
magnetic intensity, isothermal remanent magnetization, vs. applied impluse field, A3:242–244, 247
magnetic intensity, natural remanent magnetization, vs. depth, A3:238
magnetic intensity, uncorrected remanent magnetization, vs. depth, A3:235; A4:207
magnetic lineation, magnetic susceptibility, A3:237
magnetic properties, minicores, A3:300, 302–304; A4:56–57, 258; A6:11–12, 44, 46
magnetic susceptibility altered volcanic rocks, A3:75; A4:53 anisotropy, A3:301; A4:209, 259; A6:11, 31, 45 archive-half core measurements, A3:78–79; A4:55–56 Flinn-type diagram of anisotropy, A3:237 rhyodacite, A6:10 vs. depth, A3:228, 236; A4:200, 208; A6:27
magnetic susceptibility, volume, vs. depth, A3:234; A4:206; A6:30
magnetite amygdules, A3:29–30 bacteria, A6:26 chemical composition, B3:24–26 hydrothermal alteration, B1:15–16 inclusions, A4:36 mineralization, B3:4 petrography, A3:55, 57 photograph, A3:128, 167; A4:94 photomicrograph, A1:73; A3:156, 166, 169–170, 177–179, 183–190, 193–198; A4:83, 148, 155, 158, 165–167, 184 silicification alteration, A3:41–47 veins, A3:59–65 vs. depth, A3:171; A4:117
magnetite, disseminated, photograph, A3:157
magnetite, lattice-textured, photomicrograph, A3:180
magnetite, microlitic, photomicrograph, A1:81
magnetite inclusions, lithologic units, B2:7
magnetite microphenocrysts lithologic units, B2:5 photomicrograph, B2:16
magnetite phenocrysts petrology, A5:4; A6:4 photograph, A1:77; A5:7 photomicrograph, A1:78; A5:8
major elements alteration, B1:63 altered/parent rocks, B6:16 bulk samples, A3:288–289; A5:14; A6:38 fresh and altered dacite, B12:3–4 mass transfer, B1:64 oxides, A3:284–285, 290–291; A4:243–244
manganese altered rocks, B1:19, 47 pore water, B4:4–5 vs. iron, B4:12 See also iron-manganese-silica deposits
manganese/iron ratio, pore water, B4:7
Manus Basin, anhydrite geochemistry, B7:1–23
Manus Basin E, geology, A1:1–84; B1:3–7; B2:3–4
Manus Trench, subduction zones, A1:3–5
Manus volcanic zone E, lithology, A1:4
maps bathymetry, A1:34 tectonics, A1:32
marcasite lithologic units, A6:5 photomicrograph, A1:82; A4:150; A6:20
marcasite, euhedral, lithologic units, A6:6
Marker 14, hydrothermal fields, A1:6–7
mass transfer, alteration, B1:64
matrix, anhydrite, photograph, A4:180
matrix, clay-rich, photograph, A3:122
matrix, pyrite, photograph, A4:180
matrix, quartz, photograph, A4:180
matrix, quartz-breccia, photomicrograph, A4:140
matrix, quartz-pyrite, photomicrograph, A4:145
matrix, quartz-rich, photograph, A4:144
medium resistivity logs, vs. depth, A4:217, 226
melt inclusions chimneys, B1:34 lithologic units, B2:5, 7 photomicrograph, B2:16
metals altered/parent rocks, B6:17 chimneys, B1:33–35
metasomatism, silicification alteration, A3:42–47
methane, hydrothermal fields, A1:6–7
microbes hydrothermal fields, A1:7 mineralization, A1:27
microbiology Site 1188, A1:16; A3:71–74 Site 1189, A1:20; A4:49–52 Site 1191, A1:23; A6:8–9
microcrysts, groundmass, A5:5
microfabric, photomicrograph, B6:15
microfractures fluid flow, B1:30 quartz, B9:4
microlites bacterial habitation, A3:225 hydrothermal alteration, B1:15 lithologic units, A4:15–23 petrology, A5:5 photograph, A3:112 photomicrograph, A3:105, 130, 134, 141, 155, 160; A4:146–147
micromorphology, microorganisms, A3:73–74; A4:52; A6:9
microorganisms enrichment cultures, A3:72–73 micromorphology, A3:73–74
microphenocrysts petrology, A6:4; B2:6 photomicrograph, A3:156
microspherulites lithologic units, A3:24 photograph, A4:89 photomicrograph, A3:114–115
microvesicles groundmass, B2:7 photomicrograph, A1:78; A4:108; A5:8–9
mineral chemistry, dacite lava, B2:8–9, 30–31
mineralization alteration, A1:27; B1:27–28 distribution map, B1:53 gold, B3:4 hydrothermal alteration, B1:12–29 semimassive sulfides, B1:22–23 sulfides, B3:3–4 sulfides and oxides, A3:52–58
minerals hydrothermal alteration, B1:13–16 X-ray diffraction data, A3:279–283; A4:240–242; A5:13; A6:37; B8:18
minor elements, mass transfer, B1:64
models, tectonics, A1:33
Miocene, lithology, A1:4
molybdenum jasperoids, B9:6 massive sulfides, B10:4 pore water, B4:4–5
mottling, hydrothermal alteration, B1:17

N

native gold, massive sulfides, B10:6
neovolcanics, lithology, A1:4
neutron porosity logs measurements, A3:93–94; A4:61 vs. depth, A3:256; A4:217
New Britain, volcanism, A1:3–5
New Britain Trench, volcanism, A1:3–5
New Hanover, volcanism, A1:3–5
New Ireland, volcanism, A1:3–5
nickel jasperoids, B9:6 pore water, B4:4–5 xenoliths, B6:3
nodules, semimassive sulfides, B1:22–23
nodules, spheroidal, lithologic units, A3:30–31
nonmetals, altered/parent rocks, B6:17

O

olivine, xenoliths, B6:2–3
olivine blades, photomicrograph, B6:7–9, 14
Ontong Java Plateau, volcanism, A1:3–5
opal, hydrothermal event frequency, B1:25
orthopyroxene, mineral chemistry, B2:8–9
orthopyroxene phenocrysts, lithologic units, B2:5
outflow zones, chimneys, A1:23–28
outgrowths, epitaxial, dacite, B6:12
outgrowths, photomicrograph, B9:19
oxides bulk samples, A3:288–289 electron probe data, B3:7–8 major elements, A3:284–285, 290–291; A4:243–244 mineral chemistry, B3:1–31 parageneses, A4:159, 168 petrography, A1:14–15, 19; A3:51–58; A4:33–41; A6:6
oxygen isotopes, temperature, B1:23

P

Pacific Ocean, geology, A1:1–84
Pacific plate, subduction zones, A1:3–5
PACMANUS hydrothermal field alteration phases, B5:1–10; B11:1–19 altered dacitic rock geochemistry, B8:1–18 anhydrite geochemistry, B7:1–23 basalt xenoliths, B6:1–19 core-scale permeability, B13:1–19 fresh and altered dacites, B12:1–9 geologic map, B2:13–14 geology, A1:5–7; B1:3–7; B2:3–4 permeability, resistivity, and X-ray computed tomography, B14:1–14 pore water geochemistry, B4:1–15 sulfide and oxide mineral chemistry, B3:1–31
paleoseafloors, volcanism, B1:9–11
Papua New Guinea active felsic-hosted hydrothermal system, B1:1–71 geology, A1:1–84
parageneses secondary minerals, A3:199; A4:36–37, 40, 159, 168 sulfides and oxides, A3:52–58; A4:159, 168 veins, A3:53–58, 61–65
paragonite geochemistry, B8:5 hydrothermal event frequency, B1:25 See also pyrophyllite + paragonite
pebble breccia lithologic units, A3:21–33 photograph, A3:111
perflurocarbon tracers, contamination, A3:74
perlite lithologic units, A3:23; A4:18–19 photomicrograph, B8:7; B9:20 volcanism, B1:9–11
permeability fluid flow, B1:29–30, 37 resistivity and X-ray computed tomography, B14:1–14 vs. confining pressure, B13:12–13 vs. depth, B13:14, 16 vs. porosity, B13:15, 17; B14:12 vs. pressure, B14:12
permeability, core-scale, hydrothermal systems, B13:1–19
petrography igneous rocks, A1:14, 18, 21–22 jasperoids, B9:1–30 sulfides and oxides, A1:14–15, 19 xenoliths, B6:2–3
petrology dacite lava, B2:1–31 hydrothermal alteration, B1:16–18
pH geochemistry, B1:27 pore water, A4:48
phenocrysts lithologic units, A3:23, 30; A4:12, 18; B2:5–6 petrology, A5:4; A6:4; B2:7–8 photomicrograph, A1:78; A5:8 See also microphenocrysts
phosphorus, jasperoids, B9:5
photoelectric factor logs, vs. depth, A3:256; A4:217, 226
physical properties Site 1188, A1:16; A3:74–77; B13:19 Site 1189, A1:20; A4:52–55; B13:19 Site 1190, A5:6 Site 1191, A1:23; A6:10–11
plagioclase alteration phases, B11:1–19 geochemistry, B1:47; B8:4–5 mineral chemistry, B2:8–9 no bacterial habitation, A3:227 photograph, A1:77 silicification alteration, A3:46–47 vs. depth, A3:171; A4:117 See also anorthite
plagioclase, calcic, hydrothermal alteration, B1:15
plagioclase, microlitic bacterial habitation, A3:225 photomicrograph, A1:81; A3:160; A4:121; A6:19
plagioclase, skeletal, photomicrograph, A4:110
plagioclase, variolitic, photomicrograph, A4:85, 111
plagioclase laths photomicrograph, B6:8–12, 15 xenoliths, B6:2–3
plagioclase microcrysts, photomicrograph, A3:165; A5:9
plagioclase microlites groundmass, B2:5–8 lithologic units, A3:30–31 photograph, A4:71 photomicrograph, A4:97, 123; B2:16–17; B9:15
plagioclase needles, photomicrograph, A3:131–132; A6:16
plagioclase phenocrysts distribution and types, A3:277 lithologic units, A3:23–33; A4:12, 18; B2:5 petrology, A5:4; A6:4; B2:7–8 photograph, A3:112, 124; A5:7 photomicrograph, A1:44, 53, 64, 78; A3:130, 135–136, 155, 161; A4:84, 97–98; A5:8; B2:18; B9:20
plagioclase phenocrysts, euhedral, photomicrograph, B2:16, 19
plagioclase phenocrysts, resorbed, photomicrograph, B2:17
Pleistocene. See Pliocene/Pleistocene boundary
Pliocene, lithology, A1:4
Pliocene/Pleistocene boundary, lithology, A1:4
plunge, vs. depth of vesicles, A4:179
pore water, geochemistry, A3:70–71, 293; A4:48, 249; B4:1–15
porosity alteration, A1:25; B1:37 altered volcanic rocks, A3:76–77; B1:20 dacite, B1:11–12 fluid flow, B1:29–30 hydrothermal systems, B13:5–9 resistivity, B14:5–6 vs. depth, A3:233; A4:205; B13:16 vs. permeability, B13:15, 17; B14:12
potassium alteration, A3:69; B1:36–37, 47 altered rocks, B1:19–20 pore water, B4:4 vs. depth in altered volcanics and in precursors, B1:68
potassium/calcium ratio, altered rocks, B1:19, 28
potassium/sodium ratio, hydrothermal alteration, B1:13
potassium feldspar hydrothermal alteration, B1:15 vs. pyrophyllite + paragonite, B6:3
potassium feldspar-illite alteration, geochemistry, B8:1–18; B11:3
potassium ions, geochemistry, B1:27
potassium logs formation evaluation, A3:95–96 vs. depth, A3:256, 193; A4:217, 226
potassium oxide alteration, A3:69, 71 dacite lava, B2:8 vs. depth, A3:223; A4:191 See also sodium oxide + potassium oxide
pressure vs. permeability, B14:12 vs. resistivity, B14:12 vs. time, A4:227
pressure, confining tomography, B14:9–12 vs. permeability, B13:12–13
pressure, effective, permeability, B13:5–9
pressure cooker model, conceptual cross section, B1:61
pseudobreccia, photograph, A4:93, 137, 185
pseudomorphism photomicrograph, A4:158 silicification alteration, A3:44–47
pseudomorphs lithologic units, A3:30; A4:14 photomicrograph, B6:14
Pual Ridge dacite lava petrology and geochemistry, B2:1–31 geology, A1:1–84; B1:4–7 longitudinal section, B1:55 sulfide and oxide mineral chemistry, B3:1–31 three-dimensional shaded-relief image, B2:15 volcanic architecture, B1:9–12
pumice, photomicrograph, B8:11
pyrite alteration, A1:26; A3:51 amygdules, A3:29–30 chemical composition, B3:9–14 fresh and altered dacite, B12:3–4 hydrothermal alteration, B1:15 lithologic units, A3:28–33; A4:15–41; A6:5 massive sulfides, B10:5–7 mineralization, B3:3 no bacterial habitation, A3:227 petrography, A3:56–57 photograph, A1:58–60, 71; A3:172; A4:69, 88, 144 photomicrograph, A1:45, 55, 57, 68, 73; A3:166, 170, 179, 183, 185–188, 195–196, 198; A4:83, 128–129, 142, 145, 148–156, 158, 165–167, 175–176, 182–184; B1:56; B6:8; B9:24–25 semimassive sulfides, B1:22–23 sulfur isotopes, B1:32 veins, A3:54, 59–65 vs. depth, A3:171; A4:117 See also anhydrite-pyrite-pyrophyllite alteration; chlorite-pyrite alteration
pyrite, anhedral, semimassive sulfides, A4:38–39
pyrite, disseminated parageneses, A3:52; A4:35–36 photograph, A4:131 photomicrograph, A4:127, 146
pyrite, disseminated euhedral, photomicrograph, A4:147
pyrite, disseminated Type 1, photomicrograph, A4:146
pyrite, euhedral lithologic units, A6:6 photomicrograph, A3:18; B6:14
pyrite, framboidal parageneses, A4:159 photomicrograph, A1:82; A4:162; A6:20
pyrite, subhedral, photomicrograph, A3:177
pyrite cubes, photomicrograph, A3:156
pyrite intergrowths, photomicrograph, B6:14
pyrite rims, photomicrograph, A4:160–161
pyrophanite chemical composition, B3:31 spinel, B3:5
pyrophyllite alteration phases, B1:37; B5:1–10; B11:1–19 geochemistry, B8:5 hydrothermal alteration, B1:13–16 photomicrograph, A3:160 selvage, B1:17 temperature, B1:23–24 vs. depth, B5:5 See also anhydrite-pyrite-pyrophyllite alteration
pyrophyllite + paragonite, vs. potassium feldspar, B6:3
pyroxene composition, B2:25 xenoliths, B6:2–3 See also clinopyroxene; orthopyroxene
pyroxene plates, photomicrograph, B6:8–11, 14
pyrrhotite petrography, A3:55, 57 photomicrograph, A1:56; A3:184–185 pyrite inclusions, B3:3

Q

quartz alteration, B11:1–19 amygdules, A3:29–30 domain significance, B1:25–26 fluid inclusions, B1:24 hydrothermal alteration, B1:14–15 hydrothermal event frequency, B1:24–25 inclusions, B9:4–7 lithologic units, A3:26–33; A4:15–41 photograph, A1:74–75; A3:211; A4:88, 90, 96, 138 photomicrograph, A1:45; A3:152, 155, 158, 163, 165–166, 168–169, 177–178, 182–183, 190–192, 212; A4:101–102, 106, 128, 130, 150–151, 156, 162–163, 166, 182–184; B1:56 silicification alteration, A3:41–47 veins, A3:59–65 vs. depth, A3:171; A4:117 See also cristobalite–quartz transition
quartz, euhedral, photomicrograph, A3:197–198; B9:24
quartz, jasperoidal, photomicrograph, A1:69, 104, 130
quartz, micropoikilitic, photomicrograph, A4:109
quartz, poikiloblastic, photomicrograph, A4:125–126, 175–176
quartz, polycrystalline, photomicrograph, B9:23
quartz, secondary, photomicrograph, A3:197–198
quartz, Type 2a, photomicrograph, A4:149
quartz aggregates, photomicrograph, A3:133
quartz crystals, photograph, B9:11
quartz needles, photomicrograph, A3:113
quartz overgrowths, photomicrograph, A4:125–126
quartz phenocrysts, photomicrograph, A4:125–126
quartz-rich patches, lithologic units, A3:31

R

rare earths altered rocks, B1:48 anhydrite, B7:7, 13–14 dacite lava, B2:8, 23; B9:26 fresh and altered dacite, B12:4 iron-manganese-silica deposits, B9:26 jasperoids, B9:5–7, 26 pore water, B4:4–7, 11 profiles, B6:18 semimassive sulfides, B10:11 xenoliths, B6:4
Rataman Formation, lithology, A1:4
rate of penetration logs, vs. depth, A3:250
reaction zones, chimneys, B1:35
remanent magnetization, isothermal intensity vs. applied impulse field, A3:247 magnetic intensity, A3:81–83
remanent magnetization, natural discrete measurements, A3:80–81 rhyodacite, A6:11–12
resistive units Formation MicroScanner imagery vs. depth, A4:221, 223 resistivity-at-the-bit, A4:228
resistivity dacite, B1:11–12 vs. pressure, B14:12 X-ray computed tomography and permeability, B14:1–14
resistivity-at-the-bit conductive minerals, A4:229 resistive units, A4:228 vs. Formation MicroScanner imagery, A1:76; A4:65, 230
resistivity-at-the-bit logs vs. depth, A3:250–251 vs. gamma ray logs, A3:252
resistivity logs measurements, A3:93; A4:60, 63 vs. depth, A3:250 See also deep resistivity logs; medium resistivity logs; shallow resistivity logs
rhyodacite alteration, A3:36–51 geochemistry, A3:69, 71 lithology, A1:4 photomicrograph, A6:16 See also dacite
rhyodacite, altered photograph, A1:80; A6:15 photomicrograph, A4:146; A6:17–18
rhyodacite, altered vesicular aphyric, petrology, A6:3–4
rhyodacite, aphyric, photograph, A1:79; A6:14
rhyodacite, porphyritic, alteration films, A3:37
rhyodacite, unaltered, volcanism, B1:11–12
rhyodacite, vesicular, photograph, A1:43; A3:103
rhyodacite, vesicular microlite-bearing glassy, lithologic units, A3:21–33
rhyolite. See dacite/rhyolite boundary
rift zones, lithology, B1:5
rock magnetism Site 1188, A1:16–17; A3:77–86 Site 1189, A1:20–21; A4:55–59 Site 1191, A1:23; A6:11–12
Roman Ruins hydrothermal fields, A1:5–7; B1:7; B2:3–4, 6 iron-manganese-silica deposits, B9:7 location, A1:61
rubidium altered rocks, B1:19 pore water, B4:4
rutile hydrothermal alteration, B1:16 photomicrograph, A3:205–206

S

salinity alteration, A3:71 pore water, A4:48
samarium. See lanthanum/samarium ratio
sandstone, alteration, A1:27
sandstone, graded volcaniclastic lithologic units, A4:17–23, 32 photomicrograph, A4:112
Satanic Mills, hydrothermal fields, A1:5–7; B1:6; B2:3–4, 7–8
scandium, altered rocks, B1:48
seafloor spreading, volcanism, A1:3–5
secondary minerals parageneses, A3:199 vs. depth, A1:49–50, 66–67; A3:35, 137–138; A4:114–116; B11:7–9
seismic profiles, Manus Basin, A1:35–36
seismicity, volcanism, A1:5
selenium galena, B3:3 massive sulfides, B10:4
selvage hydrothermal event frequency, B1:25 photograph, B1:57; B9:11 photomicrograph, B1:56; B9:15–16 pyrophyllite, B1:17, 47 quartz, B9:4–7
selvage, illitic, geochemistry, B1:26–27
shallow resistivity logs, vs. depth, A3:256
shear wave velocity logs, vs. depth, A3:256; A4:217
silica alteration, A3:69; A4:47–48 altered rocks, B1:19 dacite lava, B2:8 hydrothermal alteration, B1:14–15 photograph, A4:69 photomicrograph, A6:17 rhyodacite, A6:8 veins, A3:59–65 vs. aluminum oxide, B2:21 vs. calcium oxide, B2:21 vs. depth, A3:223; A4:191, 193 vs. europium/europium ratio, B2:24 vs. iron oxide, B2:21 vs. magnesium oxide, B2:21 vs. sodium oxide + potassium oxide, A6:24; B2:20 vs. titanium/zirconium ratio, B2:22 vs. zirconium/titanium oxide ratio, B1:65 See also green silica-clay alteration; iron-manganese-silica deposits; silica-chlorite alteration; silica-clay alteration
silica, green, alteration, A3:38–39
silica, microcrystalline, lithologic units, A6:5
silica, opaline, alteration, A3:38
silica-chlorite alteration, lithologic units, A4:10–23
silica-clay alteration photograph, A4:137, 185 photomicrograph, A4:123
silicification alteration, A3:41–51; A4:28–41 hydrothermal alteration, B1:16–18 lithologic units, A4:11–23 photograph, A3:110, 151, 157, 208; A4:76–77 photomicrograph, A3:129, 147–148, 158, 165, 196, 205–206
silicification, poikiloblastic lithologic units, A4:24–25, 28–29 photomicrograph, A4:125–126
silicon altered rocks, B1:47 jasperoids, B9:5–7 vs. depth in altered volcanics and in precursors, B1:66
silicon/iron ratio, jasperoids, B9:7
silver, galena, B3:3
Site 1188, A3:1–305 alteration phases, B5:1–10; B11:1–19 anhydrite geochemistry, B7:1–23 basalt xenoliths, B6:1–19 core-scale permeability, B13:1–19 coring summary, A3:262–264 downhole measurements, A1:17; A3:86–96 fresh and altered dacites, B12:1–9 geochemistry, A1:16; A3:65–71 hydrothermal alteration, A1:14; A3:33–51 igneous petrology, A1:14; A3:19–33; B2:5–6 lithology, A1:40–42 location, A1:61 microbiology, A1:16; A3:71–74 operations summary, A3:6–18 physical properties, A1:16; A3:74–77 pore water geochemistry, B4:1–15 principal results, A3:1–6 rock magnetism, A1:16–17; A3:77–86 site description, A3:1–305 site objectives, A1:13; A3:6 site survey, A3:18–19 structural geology, A1:15; A3:58–65 sulfide and oxide mineral chemistry, B3:1–31 sulfide and oxide petrography, A1:14–15; A3:51–58 summary, A1:13–17 television surveys, A1:39
Site 1189, A4:1–259 alteration phases, B5:1–10; B11:1–19 alteration summary, A4:233–234, 236–239 anhydrite geochemistry, B7:1–23 basalt xenoliths, B6:1–19 core-scale permeability, B13:1–19 coring summary, A4:231–232 downhole measurements, A1:21; A4:59–65 geochemistry, A1:20; A4:46–48 hydrothermal alteration, A1:18–19; A4:23–34 igneous petrology, A1:18; A4:8–23; B2:6 jasperoids, B9:1–30 lithology, A1:62–63; A4:233–234, 236–239 location, A1:61; A4:67 massive sulfide geochemistry, B10:1–22 microbiology, A1:20; A4:49–52 operations summary, A4:5–7 physical properties, A1:20; A4:52–55 pore water geochemistry, B4:1–15 principal results, A4:1–5 rock magnetism, A1:20–21; A4:55–59 site description, A4:1–259 site objectives, A1:17; A4:5 site survey, A4:7–8 structural geology, A1:19–20; A4:41–46 sulfide and oxide mineral chemistry, B3:1–31 sulfide and oxide petrography, A1:19; A4:33–41 summary, A1:17–21
Site 1190, A5:1–15 coring summary, A5:10 geochemistry, A5:6 hydrothermal alteration, A1:22; A5:5–6 igneous petrology, A1:21; A5:3–5; B2:6–7 location, A4:67 operations summary, A5:2–3 physical properties, A5:6 principal results, A5:1 site description, A5:1–15 site objectives, A1:21; A5:1–2 site survey, A5:3 summary, A1:21–22
Site 1191, A6:1–46 coring summary, A6:34 fresh and altered dacites, B12:1–9 geochemistry, A1:23; A6:8 hydrothermal alteration, A1:22; A6:4–6 igneous petrology, A1:22; A6:3–4; B2:7–8 lithology and alteration, A6:35 microbiology, A1:23; A6:8–9 operations summary, A6:2–3 physical properties, A1:23; A6:10–11 principal results, A6:1–2 rock magnetism, A1:23; A6:11–12 site description, A6:1–46 site objectives, A1:22; A6:2 site survey, A6:3 structural geology, A1:22–23; A6:7–8 sulfide and oxide petrology, A6:6 summary, A1:22–23
smectite breccia, A4:41–44 geochemistry, B8:5
Snowcap conceptual cross section, B1:61 hydrothermal fields, A1:6–7; B1:6; B2:3–6
sodium alteration, A3:69 altered rocks, B1:19 pore water, B4:4 See also potassium/sodium ratio
sodium oxide alteration, A3:69, 71; A4:47–48 dacite lava, B2:8 vs. depth, A3:223; A4:191, 193
sodium oxide + potassium oxide, vs. silica, A6:24; B2:20
Solomon microplate, volcanism, A1:3–5
sonic velocity logs, measurements, A3:94; A4:61
South Bismarck microplate, volcanism, A1:3–5
sphalerite chemical composition, B1:6; B3:18 lithologic units, A4:15–41 massive sulfides, A4:36, 39–40; B10:5–7 petrography, A3:57 photomicrograph, A1:73; A4:152–153, 155–157, 163 semimassive sulfides, B1:22–23 veins and vesicle linings, B3:3 vs. depth, A4:117
sphalerite, subhedral iron-rich, photomicrograph, A3:181
sphalerite, zoned, photomicrograph, A4:164
sphalerite disease, photomicrograph, A4:157
spheroids bacterial habitation, A3:225 photomicrograph, A3:131–132
spherulites lithologic units, A3:23–24; A4:20 photograph, A4:136 photomicrograph, A3:113, 147, 164; A4:106–107, 109; B8:13 See also microspherulites
spinel alteration, A3:50; A6:6 mineralization, B3:4 petrography, A3:55 photomicrograph, A3:168, 190, 192–193
spreading centers, volcanism, A1:4–5
stockwork zone alteration, B1:21 chimneys, A1:25; B1:7 massive sulfides, B1:28; B10:5–7 photograph, A1:52; A3:106; A4:69 photomicrograph, A4:104–105; B8:10
Stoneley wave velocity logs, vs. depth, A3:256
strontium anhydrite, B7:7 jasperoids, B1:48; B9:5 massive sulfides, B10:4 pore water, B4:4–5 vs. depth, A3:224; A4:192, 194; B7:12 vs. europium/europium ratio, B2:24
strontium isotopes anhydrite, B1:30–32; B7:1–23 chimneys, B1:34, 37 pore water, B4:4–6 vs. 1/strontium ratio, B7:15 vs. depth, B1:60; B7:11 vs. europium/europium ratio, B7:15 vs. lanthanum/samarium ratio, B7:15
structural geology Site 1188, A3:58–65 Site 1189, A1:19–20; A4:41–46 Site 1191, A1:22–23; A6:7–8
structure anhydrite veins, A3:215 veins, A1:15
structure, cockade, photomicrograph, A4:143
structure, frond-like, photomicrograph, B9:21
structure, ovoid, photomicrograph, A4:160–161
structure, plumose, photomicrograph, B6:13
subduction zones, geology, A1:3–5
subduction zones, intraoceanic, backarc basins, A1:3–5
sulfate cations, A3:287 lithologic units, A4:14
sulfides chimneys, A1:23–28 electron probe data, B3:7–8 mineral chemistry, B3:1–31 mineralization, B3:3–4 parageneses, A4:159, 168 petrography, A1:14–15, 19; A3:51–58; A4:34–41; A6:6 photograph, A4:96, 138, 182–183
sulfides, massive bulk composition, B10:22 geochemistry, B10:1–22 photograph, A1:71; A4:78–79
sulfides, semimassive bulk composition, B10:22 geochemistry, B10:1–22 lithologic units, A4:11–23, 29–30; B1:7 mineralization, B1:22–23, 37 photograph, A4:144 ternary diagram, B10:10
sulfur galena, B3:3 geochemistry, A3:69–70 jasperoids, B9:5–7 pore water, B4:4 xenoliths, B6:3
sulfur, total altered rocks, B1:48 volcanic rocks, A3:286, 292 vs. depth, A3:224; A4:192, 194, 245–246
sulfur isotopes anhydrite, B1:30–32; B7:1–23 hydrothermal fields, A1:7 massive sulfides, B10:5, 13 pyrite, B1:32 vs. depth, B7:11

T

talc, hydrothermal alteration, B1:16
tectonics maps, A1:32; B1:50 models, A1:33
television surveys, vibration-isolated, bathymetric contours, A1:39; A3:101
tellurium altered rocks, B1:48 jasperoids, B9:6 massive sulfides, B10:4 semimassive sulfides, B1:23 xenoliths, B6:4
temperature fluid flow, B1:33 hydrothermal alteration, B1:23–24 logging-while-drilling data, A3:87 measurements, A4:61–62, 64 vs. depth, A3:86–87, 257; A4:218 vs. magnetic intensity, A3:246 vs. time, A3:248–249, 258; A4:219, 227
temperature logs, measurements, A3:94–95
tennantite massive sulfides, B10:4–7 semimassive sulfides, A4:39
textures lithologic units, A3:22–26, 29–32 photomicrograph, A3:205–206
textures, breccia alteration, A1:25 photomicrograph, A3:119
textures, clastic lithologic units, A3:25; A4:20–21 photograph, A3:122, 125 photomicrograph, A3:135–136, 163
textures, clastic/mottled, lithologic units, A3:32
textures, fibrous laminar, photomicrograph, A1:72; A4:80
textures, fragmental, photograph, A3:127
textures, glomerophyric, photomicrograph, A1:78; A5:8
textures, granular, photomicrograph, A4:97
textures, hieroglyphic, photograph, A4:95, 132
textures, intergranular, photomicrograph, A4:110
textures, jackstraw, photomicrograph, B2:17
textures, jigsaw-fit photograph, A4:76–77 photomicrograph, A3:117–119
textures, laminar, photograph, A4:74–75, 92
textures, palimpsest quench, dacite, B6:1–19
textures, perlitic lithologic units, A3:23; A4:12, 18–19 photograph, A1:46, 52; A3:104, 106, 140, 142, 144; A4:70 photomicrograph, A1:47; A3:105; A4:101, 104–105
textures, pilotaxitic, photograph, A4:71
textures, poikiloblastic, photomicrograph, B9:19
textures, primary, silicification alteration, A3:41–47
textures, pseudoclastic lithologic units, A3:25–26, 32; A4:13, 21–22 photograph, A1:46; A3:140, 142
textures, spheroidal photograph, A3:123 photomicrograph, A3:131–132
textures, spherulitic lithologic units, A3:23–24 photomicrograph, A3:113
textures, spinifex basalt, B6:1–19 photomicrograph, B6:7–15
textures, vesicular alteration, A1:25 lithologic units, A3:30–33
textures, vitriclastic, photomicrograph, A3:117–118
textures, volcanic, lithologic units, A3:22–24, 29–32; A4:11–15, 18–23
textures, volcaniclastic, lithologic units, A3:24–26; A4:12–13, 21
thermal conductivity altered volcanic rocks, A3:76; A4:54 rhyodacite, A6:10 volcanic rocks, A5:6 vs. depth, A3:231; A4:203; A6:29
thorium altered rocks, B1:48 pore water, B4:5
thorium logs formation evaluation, A3:95–96 vs. depth, A3:256; A4:217, 226
titanium oxide alteration, A4:48 dacite lava, B2:8 rhyodacite, A3:71 vs. depth, A3:223; A4:191, 193 vs. zirconium, B2:22 xenoliths, B6:2 See also zirconium/titanium oxide ratio
titanomagnetite chemical composition, B3:30 mineralization, B3:4 photomicrograph, A3:189
tomography, X-ray computed, permeability, B14:1–14
trace elements bulk samples, A3:288–289; A4:243–244; A5:14; A6:38 fresh and altered dacite, B12:3–4 jasperoids, B9:5–7 mass transfer, B1:64 volcanic rocks, A3:284–285, 290–291; A4:247–248
trace elements, magmatophile, hydrothermal fields, A1:7
trachytic alignment, photomicrograph, A3:165
translucent clusters, photomicrograph, A4:198–199
Tsukushi, hydrothermal fields, A1:6–7
Tsukushi group, lava, B1:12
tube pumice, lithologic units, A4:13
tube worms, hydrothermal fields, A1:7

U

uranium altered rocks, B1:19–20, 36–37, 48 jasperoids, B9:5 massive sulfides, B10:4
uranium logs formation evaluation, A3:95–96 vs. depth, A3:256; A4:217, 226

V

vanadium, xenoliths, B6:3
vein linings, sphalerite, B3:3
vein systems, multiple opening photograph and sketch, A3:216–217
veinlets petrology, A5:5–6 photomicrograph, B9:16 quartz, B9:4–7 silicification alteration, A3:42–47
veinlets, anhydrite-pyrite photograph, A3:124, 145, 159 photomicrograph, A3:205–206
veinlets, cristobalite-pyrite, photomicrograph, A3:205–206
veinlets, opaline silica, photograph, A3:140
veinlets, quartz-pyrite-magnetite, photomicrograph, A3:149
veins alteration, A4:10–41; A6:6; B1:21 anhydrite, A1:26 bleaching alteration, A3:39–41 dilation, B1:28–29 dip vs. depth, A3:204; A4:178, 190 dip vs. overall dip, A3:222 distribution in different intervals of dip, A4:177, 189 geometry, A3:61, 64; A4:43, 45; A6:7–8 green silica-clay alteration, A3:38–39 jasperoids, B9:6–7 lithologic units, A3:30–33 mineralogy, A3:62; A4:42–45, 186; A6:7–8 mineralogy vs. lithologic units, A3:203, 209–210; A4:173, 187 parageneses, A3:61–65; A4:42–45 photograph and sketch, A3:213–214; A4:182–183 photomicrograph, A1:82; A3:205–206; A6:20; B9:20 structure, A1:15, 59–65 thickness, A3:203, 221; A4:177, 189
veins, anastomosing quartz, photomicrograph, A4:142
veins, anhydrite alteration schematic diagram, photograph, B1:58 bleaching alteration, A3:41; B1:58 petrology, B1:17 photograph, A3:215; A4:92, 133, 181, 184 photomicrograph, A3:174 separates from hydrothermal veins and vug fills, B7:16–23 strontium and sulfur isotopes, B1:30–32
veins, anhydrite-pyrite lithologic units, A4:15–23 photograph, A1:58–60; A3:121, 207 photomicrograph, A1:54, 57; A3:175–176, 205–206, 212 structure, A3:60
veins, anhydrite-pyrite-silica-magnetite, structure, A3:59–60
veins, anhydrite-quartz-cristobalite, photomicrograph, A3:174
veins, anhydrite-quartz-pyrite lithologic units, A4:10–23 photograph, A3:173; A4:76–77, 88 photomicrograph, A4:120, 128, 141, 143
veins, anhydrite-silica-clay, photograph, A3:207–208
veins, anhydrite-silica-clay-pyrite, structure, A3:61
veins, cristobalite-anhydrite-pyrite, photomicrograph, B6:13
veins, quartz hydrothermal fields, B1:28 photomicrograph, A3:119, 205–206; A4:119, 157
veins, quartz-anhydrite photograph, A4:188 photomicrograph, A4:82, 175–176
veins, quartz-clay, photograph, A3:219–220
veins, quartz-pyrite lithologic units, A4:15–23 photograph, A1:74; A3:211; A4:73, 172, 174 photomicrograph, A3:146, 148, 218; A4:122, 124, 171, 175–176
veins, quartz-pyrite-magnetite, photograph, A4:94, 133
veins, quartz-sphalerite-pyrite, photograph, A4:135
veins, quartz-sulfate, lithologic units, A4:10–23
veins, silica, photograph, A4:92–93, 137, 181, 185
veins, silica-anhydrite-magnetite-pyrite, parageneses, A3:53
veins, silica-pyrite dip vs. depth, A6:23 lithologic units, A4:10–23 photograph, A3:201 photomicrograph, A3:205–206
veins, silica-pyrite-anhydrite parageneses, A3:52–53 photograph, A1:48; A3:142–144, 153, 167, 200 photomicrograph, A3:205–206
veins, stockwork photograph, A1:52; A3:106, 144, 153 photomicrograph, A4:105
veins, stockwork ladder, photomicrograph, A3:148
veins, sulfide, lithologic units, A6:5
velocity logs measurements, A4:61 See also compressional wave velocity logs; shear wave velocity logs; sonic velocity logs; Stoneley wave velocity logs
vents, hydrothermal fields, A1:5–7
vesicle linings, sphalerite, B3:3
vesicles groundmass, B2:7–8 lithologic units, A3:22–23; A4:11–12, 18; B2:6 petrology, A5:4 photograph, A1:80; A4:71, 88; A6:4, 15 photomicrograph, A1:54; A3:145, 166, 182; A4:145, 149; B6:11 plunge vs. depth, A4:179 silicification alteration, A3:41–47 See also microvesicles
vesicles, tube, photomicrograph, A3:117–118
VIT. See television surveys
void ratio, altered volcanic rocks, A3:76–77
volatiles, chimneys, B1:33–35
volcanic edifices, lithology, A1:4
volcanic facies fluid flow, B1:32–33 volcanism, B1:9–12
volcanic fragments photograph, A1:75; A4:69–70, 75, 180 photomicrograph, A4:82, 129
volcanic glass bacteria, A6:26 bacterial habitation, A3:225–226 composition, B2:30 groundmass, B2:5–8 lithologic units, A3:23 no bacterial habitation, A3:227 petrology, A5:5; A6:4 photomicrograph, A1:78, 81; A5:8; A6:16; B2:17 silicification alteration, A3:44–47 xenoliths, B6:3
volcanic glass, perlitic hydrothermal alteration, B1:16–18 photomicrograph, B6:13
volcanic glass, vesicular dacite, photomicrograph, B6:7–15
volcanic rocks chemical classification, A6:24 point counts on thin sections, A3:269; A4:235; A5:12; A6:36 quartz-potassium-feldspar-plagioclase phases, A6:25 trace elements, A3:284–285, 290–291
volcanic rocks, altered photograph, A4:170, 181–182, 188 photomicrograph, A4:99–100, 171
volcanic rocks, altered aphyric lithologic units, A3:21–33; A4:15–23 photomicrograph, A4:101
volcanic rocks, altered felsic, X-ray diffraction data, B11:1–19
volcanic rocks, altered fractured, lithologic units, A3:21–33
volcanic rocks, altered vesicular, lithologic units, A3:21–33
volcanic rocks, aphyric, lithologic units, A4:16–23
volcanic rocks, aphyric silicified, lithologic units, A3:27–33
volcanic rocks, bleached lithologic units, A3:21–33; A4:10–23 photomicrograph, A4:122
volcanic rocks, bleached fractured, photograph, A3:153
volcanic rocks, bleached silicified, lithologic units, A3:22–33
volcanic rocks, bleached vesicular, photomicrograph, A4:121
volcanic rocks, brecciated, lithologic units, A3:27–33
volcanic rocks, flow-laminated, photograph, A3:112, 200–201
volcanic rocks, layered, orientation, A4:41, 43; A6:7
volcanic rocks, magnetite-rich, lithologic units, A3:28–33
volcanic rocks, perlitic flow-banded, lithologic units, A3:21–33
volcanic rocks, plagioclase-phyric lithologic units, A3:28–33 photograph, A3:124; A4:94
volcanic rocks, plagioclase-rich poikiloblastic, photomicrograph, A4:124
volcanic rocks, silicified lithologic units, A4:16–23 photograph, A4:184 photomicrograph, A4:123
volcanic rocks, silicified amygdaloidal aphyric, photograph, A4:88, 128
volcanic rocks, silicified flow-banded, lithologic units, A3:22–33
volcanic rocks, silicified poikiloblastic, photograph, A4:73
volcanic rocks, silicified porphyritic, lithologic units, A3:27–33
volcanic rocks, veined vesicular phyric, photograph, A4:133
volcanic rocks, vesicular lithologic units, A4:11–23 photograph, A1:51; A3:108, 110, 150
volcanic rocks, vesicular aphyric lithologic units, A4:16–23 photograph, A1:65; A3:108; A4:95, 132; A5:7
volcaniclastics bleaching alteration, A3:39–41 hydrothermal event frequency, B1:24–25 lithologic units, A3:21–33 lithology, A1:4 photograph, A3:111, 151 photomicrograph, A3:152
volcaniclastics, gravelly–sandy, volcanism, B1:9–11
volcanism architecture, B1:9–12 Eocene–Oligocene transition, A1:3–5
volume, altered rocks, B1:20
volume expansion, vs. depth, B1:59
vug fills, photograph, A4:87, 134–136

W

Wadati-Benioff Zone, volcanism, A1:3–5
wallrock alteration Category Z, B1:21 photomicrograph, B9:15–25 silica, B1:25–26
water content altered volcanic rocks, A3:76–77 volcanic rocks, A3:286, 292 vs. depth, A3:224; A4:192, 194, 245–246
weathering, lithologic units, A6:5
Weitin transform fault, lithology, A1:4
well-log Unit 1, formation evaluation, A3:95–96; A4:62, 64
well-log Unit 2, formation evaluation, A3:96; A4:62, 64
well-log Unit 3, formation evaluation, A3:96; A4:62, 64
well-log Unit 4, formation evaluation, A3:96; A4:62, 64
well-log Unit 5, formation evaluation, A3:96; A4:62, 65
well-log Unit 6, formation evaluation, A4:62, 65
well-log Unit 7, formation evaluation, A3:96; A4:62, 65
well-log Unit 8, formation evaluation, A3:96; A4:62, 65
well-log Unit 9, formation evaluation, A3:96; A4:65
well-log Unit 10, formation evaluation, A4:65
well-log units, formation evaluation, A3:95–96; A4:62, 64
Willaumez extensional transform fault, volcanism, A1:5
wireline logs heave, A3:255; A4:216, 225 vs. depth, A3:256

X

X-ray diffraction data altered felsic volcanic rocks, B11:1–19 minerals, A3:279–283; A4:240–242; A5:13; A6:37; B8:18; B11:10–19
xenoliths basalt, B6:1–19 fabric, B6:2–3 geochemistry, B6:3–4, 19 lithologic units, A3:31–32; A4:20 photomicrograph, A3:134; A4:110–111; A6:18; B6:7–15

Y

ytterbium altered rocks, B1:48 fresh and altered dacite, B12:4
yttrium altered rocks, B1:48 pore water, B4:4 vs. depth, A3:224; A4:192, 194

Z

zeolites lithologic units, A6:5 photograph, A1:80; A4:71; A6:15
Zijderveld plots demagnetization, A4:212 intensity-decay curves, A3:240–241
zinc altered rocks, B1:19–20, 49 chimneys, B1:35 jasperoids, B9:6 massive sulfides, B10:3–7 pore water, B4:4–5 pyrite, B3:3 semimassive sulfides, B1:23 vs. depth, A3:224 vs. depth in altered volcanics and in precursors, B1:69
zircon, hydrothermal alteration, B1:16
zirconium dacite lava, B2:8 rhyodacite, A3:71 vs. depth, A3:224; A4:192, 194 vs. titanium oxide, B2:22
zirconium/titanium ratio vs. silica, B2:22 xenoliths, B6:3
zirconium/titanium oxide ratio alteration, A4:48 rhyodacite, A3:71 vs. depth, A3:224; A4:192, 194; B1:54 vs. silica, B1:65
zonation, bleaching alteration, A3:39–41