169 SUBJECT INDEX
A-M

acoustic images, side-scan, Bent Hill, A:39, 158, 161
actinolite
basalts, A:213
photograph, A:100, 218
photomicrograph, A:100
veins, A:216-217
albite, veins, A:216-217
alkali earths, pore water, A:115, 218, 278
alkali metals, pore water, A:116
alkalinity
bacterial cells, B2:5
pore water, A:218, 279
vs. depth, A:115, 176, 220, 280
vs. magnesium, A:172
alkalis, pore water, A:218, 278
alkanes
gas chromatographs, A:284
See also isoprenoid/alkane ratio
alteration
chlorite, A:81
facies, A:265
geology, A:13
lithologic units, A:52
pillow lava, A:93-94
alteration, carbonate, lithologic units, A:209
alteration, chemical, sediments, A:221
alteration facies, hydrothermal alteration, A:267-268
altered rocks, photograph, A:100
aluminum
immobility, A:99, 101
mass balance, A:98
aluminum oxide
basalts, A:95
vs. depth, A:97
vs. loss on ignition, A:98
See also iron oxide-magnesium oxide-aluminum oxide plot
aluminum oxide/titanium oxide ratio, vs. zirconium/
titanium oxide ratio, A:102
ammonium
bacterial cells, B2:8
pore water, A:171-175, 218, 277-281
sediments, B10:19
vs. depth, A:115, 176, 220, 276-278, 280; B2:8, 18
vs. magnesium number, A:118, 172, 178
amphibole
basalts, A:213
lithologic units, A:267
photograph, A:100
photomicrograph, A:100
See also clinoamphibole; hornblende, basalts
amygdules, basalts, A:212-214
anatase, Deep Copper Zone, A:77
anhydrite
alteration zones, A:82-84; B9:5
disseminated sulfides, A:270
dissolution, A:117
hydrothermal alteration, A:84
hydrothermal circulation, A:7-8
lithologic units, A:164-168; B10:15
massive sulfides, A:270
photograph, A:61, 75, 80-81, 85, 108, 166
pore water, A:115
rubble, A:168
sulfide banded/impregnated sandstone, A:76
sulfide mineralization, A:71
veins, A:75-76; B10:9
anhydrite, authigenic, photograph, A:80
anhydrite, coarse, photograph, A:71
anhydrite concretions, photograph, A:57
anhydrite nodules, photograph, A:57
anisotropy
permeability, B8:4, 24
vs. depth, A:130
apatite, Deep Copper Zone, A:77
apparent age, thorium/uranium isotopes, B4:1-15
arsenic, hydrothermal alteration, A:39
authigenesis
alteration zones, A:82; B10:15
clay mineralogy, B6:7
 
bacterial cells
vs. depth, B2:4, 6, 14-17
vs. temperature, B2:6-7, 16-17
See also microorganisms
bacterial profiles, sediments, B2:1-18
banding
photomicrograph, A:72
See also colloform banding
barite
clastic sulfides, A:59-61
disseminated sulfides, A:270
hydrothermal circulation, A:11
massive sulfides, A:270
rubble, A:168
barium
clay mineralogy, B6:9
pore water, B1:2, 4
vs. depth, B1:12-13
basalts
density and porosity, B7:5-6
electrical impedance, B8:5-8
geochemistry, A:96, 215-216
lithologic units, A:44-53
niobium-zirconium-yttrium plots, A:216
permeability, B8:3-5
petrography, A:90-93
petrology, A:271-272; B10:22
photograph, A:91-93, 214
photomicrograph, A:215
thermal conductivity, B8:8-10
transition to sediment, A:210-211
velocity, B7:7-8
whole-rock geochemistry, A:216
basalts, altered
enrichment/depletion diagram, A:99
isocons, A:99
mass balance, A:99-101
basalts, diabasic, photomicrograph, A:215
basalts, microcrystalline, photograph, A:272
basalts, microgabbroic, photomicrograph, A:215
basalts, olivine-phyric, photomicrograph, A:271
basalts, plagioclase-clinopyroxene-olivine
petrology, A:271
photomicrograph, A:271
basalts, plagioclase-clinopyroxene-phyric, petrology, A:212-214
basalts, plagioclase-phyric
petrology, A:272
photomicrograph, A:271
basalts, porphyritic, mass balance, A:96, 98-99
basalts, pyroxene-phyric, photograph, A:92
base metals, leaching, A:102
basement
interaction with sediments, A:221
mass balance, A:99
bathymetry
Central Hill, A:262
drill intersections, A:271
geology, A:13
Middle Valley, A:38, 157
Site 1037, A:206
bedding, structural data, A:107-112
Bent Hill
comparison with Dead Dog, A:160-162
geochronology, B4:1-15
hydrothermal circulation, A:9-11; B10:31
lithologic units, A:46-55
massive sulfides, B10:7-12
permeability and electrical and thermal properties, B8:1-42
site description, A:35-152; B10:3-4, 35
sulfide mineral chemistry and petrography, B5:1-34
vein networks, B9:1-25
Bent Hill Massive Sulfide, hydrothermal circulation, A:10-11, 37-38, 61-67
benz[a]anthracene, gas chromatographs, A:286
benzene
sediments, A:282
vs. depth, A:285
See also ethane/benzene ratio
BHMS. See Bent Hill Massive Sulfide
biomass, microbial, sediments, B3:1-19
biostratigraphy
Site 1035, A:38-39, 57-58
Site 1036, A:169
Site 1037, A:211-212
Site 1038, A:268
upper Quaternary, A:38-39
biotite, basalts, A:213
bioturbation
Lithofacies A, A:54-56
photograph, A:61-62
sediment transition to basalt, A:210-211
bitumens
gas chromatographs, A:120, 179-182, 224, 284, 286
geochemistry, A:119-120
sediments, A:178-182, 222-223, 225, 282, 284-287
black soot
fluorescence, A:119
sediments, A:178-179, 222-223, 284
Blanco Fracture Zone, geology, A:11-13
blebs
chalcopyrite, B9:5
lithologic units, A:208
photograph, A:74, 77
boron
pore water, A:171-175, 218-219, 279
sediments, B10:19
vs. depth, A:116, 177, 220, 276-278, 280, 282
vs. magnesium, A:118, 172, 178
Bouma sequence, photograph, A:58
breccia
clastic sulfides, A:59
lithologic units, A:52
massive sulfides, A:66
photograph, A:58
breccia, bedding-parallel hydraulic, photograph, A:110
breccia, hydraulic, structures, A:169
breccia, mud-clast
lithologic units, A:165
photograph, A:60, 65, 108, 167
breccia, pyrrhotite-chalcopyrite, photograph, A:68
breccia, sulfide, photograph, A:67
brecciation, hydraulic, veins, A:75
bromide, vs. depth, B1:7-9
bromide/chloride ratio
pore water, B1:3-4
vs. depth, B1:8-9
brookite, Deep Copper Zone, A:77
Brunhes Chron
alteration, A:137-139
sediments, A:201, 232, 294
burrows, photograph, A:62, 80

 

calcimicrite, lithologic units, A:164
calcite
alteration zones, A:82
basalts, A:213, 271
Deep Copper Zone, A:77
lithologic units, A:167
photograph, A:272
sediments, A:219, 221
veins, A:216-217
calcite, biogenic, lithologic units, A:164
calcite crystals, lithologic units, A:208
calcium
clay mineralogy, B6:7, 9
hydrothermal component, A:281
mass balance, A:98
pore water, A:113-117, 171-175, 218, 274-281
sediments, B10:19
vs. chloride, A:279
vs. depth, A:112, 114-117, 176, 220, 276-278, 280, 282
vs. magnesium, A:118, 172, 174, 178
vs. strontium, A:114
calcium oxide
basalts, A:95
clay minerals, B6:6, 23
vs. depth, A:97
vs. loss on ignition, A:98
caliper logs, vs. depth, A:132, 230
carbon
bacterial cells, B2:6, 8
sediments, A:181-182
weight percentages, A:122-123, 226, 288-289
carbon, total
sediments, A:120-121, 223, 287-288
vs. depth, A:124, 185, 227, 289-290
weight percentages, A:184, 226, 288-289
carbon, total inorganic
sediments, A:121, 181-182
vs. depth, A:124, 185, 227, 289-290
weight percentages, A:184, 226, 288-289
carbon, total organic
sediments, A:121, 181-182
vs. depth, A:124, 185, 227, 289-290
weight percentages, A:184, 226, 288-289
carbon/nitrogen ratio
sediments, A:181-182
vs. depth, A:185, 290
weight percentages, A:122-123, 184, 226
carbon/sulfur ratio, weight percentages, A:122-123, 184, 226
carbon dioxide
sediments, A:117, 119, 178, 222, 282
vs. depth, A:223, 284-285
carbon number maximum, bitumens, A:119-120, 179-181
carbon preference index
bitumens, A:119-120
sediments, A:179-181, 223, 285-287
vs. depth, A:121, 183, 225, 287
carbonate nodules, pitted, photograph, A:166
carbonates
alteration zones, A:82
See also calcimicrite; calcite; dolomicrite; dolomite
catagenesis, sediments, A:179-181, 285-287
cementation
lithologic units, A:209
sediments, A:219, 221
cements, lithologic units, A:166-167
Central Hill
hydrothermal alteration, A:259; B10:5-6, 20-21, 34
hydrothermal deposits, A:257-258
hydrothermal fluids, A:258-259
hydrothermal site, B6:1-24
site description, A:253-298
sulfide mineralization, A:259
tectonic activity, A:256-257
volcanic activity, A:257
cerium, mass balance, A:98
cesium, clay mineralogy, B6:7, 9
chalcopyrite
backscattered electron image, B9:5, 19
hydrothermal circulation, A:11
massive sulfides, A:64-67
photograph, A:73-76, 80-81, 93; B9:5, 20
photomicrograph, A:68, 79; B5:16-18
precipitation within sedimentary pore spaces, B9:6, 22
sulfide mineralization, A:71
veins, A:75-76; B9:4-9, 16, 20
vs. depth, B5:15
chalcopyrite, massive fine-grained, photograph, A:68
chalcopyrite disease, massive sulfides, B5:6
chilled margins
enrichment/depletion diagram, A:99
isocons, A:99
photograph, A:272
photomicrograph, A:95
chimneys, hydrothermal circulation, A:7-9
chloride
bacterial cells, B2:7
pore water, A:113-117, 171-175, 218, 274-281; B1:3
sediments, B10:19
vs. calcium, A:279
vs. depth, A:114-116, 176, 220, 276-278, 280; B1:7-9; B2:8, 18
vs. magnesium, A:118, 172, 178
vs. potassium, A:279
vs. sodium, A:279
See also bromide/chloride ratio; sodium/chloride ratio
chlorite
alteration, A:81, 86
alteration zones, A:82-84
basalts, A:213, 272
Deep Copper Zone, A:77-78
disseminated sulfides, A:270
geochemistry, B6:5-6, 14, 17
iron oxide-magnesium oxide-aluminum oxide plot, B6:18
lithologic units, A:267
photograph, A:92-93, 106-107, 272
photomicrograph, A:94-95, 271
pillow lava, A:93-94
rare earths, B6:20
sulfide mineralization, A:69
trace elements, B6:19
veins, A:75-76, 216-217
vs. depth, B6:14-17
chlorite, fibrous, photograph, A:82
chlorite, fibrous magnesium-rich, photomicrograph, A:86
chlorite, magnesium-rich
hydrothermal alteration, A:259
photograph, A:80
chlorite/smectite mixed layer
geochemistry, B6:7
vs. depth, B6:15, 17
chloritization
alteration zones, A:82-84
clay mineralogy, B6:7
enrichment/depletion diagram, A:99
geochemistry, A:99
photograph, A:92-93, 272
photomicrograph, A:94-95
sills, A:91-93
sulfide banded/impregnated sandstone, A:76
veins, A:75-76
Chondrites
Lithofacies A, A:56
photograph, A:62
Chron C1n
alteration, A:137-139
sediments, A:201, 232
Circulation Obviation Retrofit Kit, hydrothermal circulation, A:13-14, 192-193
clasts
lithologic units, A:167-168
structures, A:169
sulfides, A:67-68
clasts, mud, photograph, A:60, 65
clasts, pyrrhotite
hydrothermal alteration, A:267-268
photograph, A:68
clasts, sulfide, photograph, A:67
clay
clastic sulfides, A:59
hydrothermal circulation, A:11
lithologic units, A:167-168, 208-209
clay, blue-green, alteration zones, A:81-82
clay, hemipelagic, lithologic units, A:263
clay, silty
Lithofacies A, A:54-56
lithologic units, A:52, 163-167
photograph, A:57, 60, 65-66, 211
clay mineralogy
sediments, B6:22
vs. electrical impedance, B8:6-7, 28
clay minerals
basalts, A:212-214
Lithofacies A, A:54-56
mineralogy and geochemistry, B6:1-24
photograph, A:70
pillow lava, A:94
See also chlorite; illite; smectite
claystone
clastic sulfides, A:59; B10:13
lithologic units, A:165, 265
claystone, calcareous silty, lithologic units, A:209-210, 266
claystone, hemipelagic, photograph, A:66
claystone, indurated, photograph, A:85
claystone, silty, photograph, A:80
climbing ripples, photograph, A:62
clinoamphibole, sulfide banded/impregnated sandstone, A:76
clinopyroxene
basalts, A:271
black crystals, A:212-214
mass balance, A:96, 98-99
photograph, A:92
sills, A:91-93
clinopyroxene, ophitic, photomicrograph, A:215
clinopyroxene, subophitic, photomicrograph, A:94, 271
Coiling Direction Zone 1, Site 1035, A:39
colloform banding, photomicrograph, A:72
Columbia River, sediments, A:219
compressional wave velocity
sediments, A:130, 227, 289-292
vs. depth, A:130, 133, 229; B7:10-12
See also velocity
concretions
alteration zones, A:82
See also anhydrite concretions; nodules
concretions, anhydrite
lithologic units, A:52
photograph, A:57
concretions, carbonate
hydrothermal alteration, A:84
lithologic units, A:52, 166-167
conductivity
relationship between sample and fluid conductivities, B8:29
vs. formation factor, B8:42
vs. resistivity, B8:42
See also resistivity
consolidation, sediments, B8:10-12
convolute laminations
photograph, A:62
sediment transition to basalt, A:210-211
copper
basalts, A:96
clay minerals, B6:6, 24
Deep Copper Zone, A:76-78
depletion, A:99
enrichment, A:99
leaching, A:102
mass balance, A:98
massive sulfides, B5:5-6
sulfides, A:88-89
vs. depth, A:89, 97
copper-iron-zinc plots, sulfides, A:90
copper-lead-zinc plots, sulfides, A:90
CORK. See Circulation Obviation Retrofit Kit
correlation, sediments, A:264
cracks, sulfide deposition, B9:6-9
cross laminations
Lithofacies B, A:56
lithologic units, A:166-167
photograph, A:60-61, 80; B9:6, 21; B10:11, 38
sills, A:90-93
crystals, authigenic, lithologic units, A:52
crystals, euhedral
photograph, A:218
photomicrograph, A:79
cyclopropyls, community composition, B3:9

 

Dead Dog Mound
comparison with Bent Hill, A:160-162
site description, A:153-203; B10:4-5
Dead Dog Vent Field
geological cross-section, A:162
hydrothermal circulation, A:7-9; B10:4-5, 14-17, 32
Deep Copper Zone
massive sulfides, B5:5-6
sulfides, A:76-78
deformation structures, photograph, A:61
deglaciation, lithologic units, A:163-165
density
sediments, A:186-188, 225-227, 289-292; B7:4-6
vs. depth, A:125, 187, 190, 229, 291-294
density, grain
sediments, A:127
vs. depth, A:128, 188, 228, 291, 293-294; B7:10-13
vs. formation factor, B8:6-7, 28
vs. permeability, B8:3-4, 23
vs. thermal conductivity, B8:8-9, 31
density, wet-bulk, vs. depth, A:228, 291, 293-294; B7:10-13
density logs
vs. depth, A:132-133, 231
See also gamma ray-density-porosity logs
desiccation, exfoliative, photograph, A:214
diabase, hydrothermal circulation, A:10
diabase, ophitic, mass balance, A:96, 98-99
diagenesis
photograph, A:55
pore water, A:175
sediments, A:179-181, 219, 221
See also alteration; authigenesis; catagenesis; cementation; recrystallization
diatoms, lithologic units, A:208
dissolution
anhydrite, A:117
hydrothermal alteration, A:267-268
lithologic units, A:52
pore water, A:115
dolomicrite, photograph, A:55
dolomicrite, authigenic, lithologic units, A:164
dolomite
alteration zones, A:82
lithologic units, A:164, 209; B10:15
sulfide mineralization, A:70
downhole measurements
Site 1035, A:130-134
Site 1036, A:188-196
Site 1037, A:227-231
Site 1038, A:292-293

 

electrical impedance. See formation factor
epidote
alteration zones, A:85
Deep Copper Zone, A:77
geochemistry, A:100-101
photograph, A:100
photomicrograph, A:95
veins, A:76
epidote, pistasitic, photomicrograph, A:100
erosion, lithofacies, A:57
Escanaba Trough
bathymetry, B10:3
comparison with Middle Valley, B10:23-24
geochemistry, B1:1-16
hydrothermal circulation, A:7-16; B10:33
hydrothermal site, B6:1-24
physical properties, B7:1-19
site description, A:205-251, 253-298; B10:1-39
ethane
sediments, A:117, 119
vs. depth, A:223, 284-285
See also methane/ethane ratio
ethane/benzene ratio, vs. depth, A:285
Eubacteria, community composition, B3:9
exfoliative desiccation, basalts, A:213
exhalations, hydrothermal circulation, A:7-9
exsolution, photomicrograph, A:68

 

Facies a, hydrothermal alteration, A:267
Facies c, hydrothermal alteration, A:267
Facies d, hydrothermal alteration, A:267
fatty acids
active sulfide flange, B3:16
compared with other sediments, B3:17
microbial biomass, B3:1-19
mole percentages, B3:19
fault scarps, slumps, B10:21-22
fault zones, formation microscanner imagery, A:134
faults
structural data, A:107-112
tectonics, A:256-257
faults, normal, hydrothermal circulation, A:9-10
faults, reverse, photograph, A:81
feeder zones
hydrothermal circulation, A:73-78
massive sulfides, A:73-78, 270-271; B9:4-5; B10:7, 10-11, 36
feldspar
geochemistry, B6:5-6, 14, 17
vs. depth, B6:14-17
fluid channels
photograph, A:72
sulfide mineralization, A:71
fluid chemistry, pore water, B1:1-16
fluid flow
alteration zones, A:87
permeability, B8:10-12
structural data, A:111
structures, B9:6-9
fluid inclusions, hydrothermal alteration, A:39
fluorescence, black soot, A:119
fluoride, vs. depth, B1:10
foraminifers
lithologic units, A:208
preservation, A:268
zoning, A:212
foraminifers, planktonic
stratigraphy, A:268
upper Quaternary, A:38-39
vs. depth, A:63
formation factor
lithologic units, B8:5-8
vs. conductivity, B8:42
vs. frequency, B8:5-6, 27
vs. grain density, B8:6-7, 28
vs. permeability, B8:26
vs. pressure, B8:5, 25, 36-39
formation microscanner imagery
logs, B8:18-19
vs. depth, A:133-136
fractionation, basalts, A:215-216
fractures
basalts, A:213-214
formation microscanner imagery, A:134-135
photograph, A:61; B9:17
photomicrograph, A:71
sills, A:90-94
structural data, A:272-273
structures, A:216-217
sulfide deposition, B9:6-9
sulfides, A:39
frequency, vs. formation factor, B8:5-6, 27

 

galena
mineralization, A:69
photomicrograph, B5:19
veins, A:75
gamma ray-density-porosity logs
Site 1035, A:147-149
Site 1037, A:244-247
gamma ray-resistivity-sonic logs
Site 1035, A:144-146
Site 1037, A:237-240
gamma rays
correlation, A:128-130
sediments, A:126, 186-188, 225-227, 289-292
vs. depth, A:125, 127, 129, 187, 190, 229, 291-294
gamma-ray logs, vs. depth, A:132, 150-152, 230-231, 241-243, 248-251
gangue minerals, massive sulfides, A:270
gases, composition, A:118, 179, 222, 283-284
gases, volatile, sediments, A:117, 119, 175, 178, 221-222, 281-282
geochemistry
basalts, A:96
clay minerals, B6:1-24
igneous rocks, A:95-102
pore water, B1:1-16
sedimentary rocks, A:101
sediments, B10:19-20
Site 1037, A:215-216
sulfides, A:87-89
geochemistry, inorganic
Site 1035, A:112-117
Site 1036, A:169-175
Site 1037, A:217-221
Site 1038, A:273-281
geochemistry, organic
Site 1035, A:117-123
Site 1036, A:175, 178-183
Site 1037, A:221-225
Site 1038, A:281-288
geochemistry, whole-rock, basalts, A:95-96, 216
geochronology, thorium-230/uranium-234 disequilibria, B4:1-15
geological setting
Site 1035, A:37-38
Site 1036, A:155-157
Site 1037, A:206
Site 1038, A:255-259
geothermal gradient, vs. depth, A:195-196, 232-233, 295; B10:23
glacial/interglacial cycles, upper Quaternary, A:38-39
gold, hydrothermal circulation, A:9
Gorda Ridge
geology, A:11-13
hydrothermal site, B6:1-24
physical properties, B7:1-19
gossan, structural data, A:108
graded bedding, photograph, A:61
grain size
clay minerals, B6:21
igneous rocks, A:212
groundmass, photomicrograph, A:100
groundmass, cryptocrystalline, photomicrograph, A:271
groundmass, microcrystalline, photomicrograph, A:215
Guaymas Basin, fatty acids, B3:16-17
gypsum, rubble, A:168

 

halides, pore water, B1:1-4
halite, rubble, A:168
halos, photograph, A:88, 92, 218
heat flow, geology, A:12, 14
helium isotopes, hydrothermal alteration, A:39
hematite
hydrothermal circulation, A:11
photomicrograph, A:79
sulfide mineralization, A:70
veins, A:75-76
vs. depth, B5:15
hemipelagites
lithologic units, A:166-168, 209, 265-266
photograph, A:211
hexane, sediments, A:179-181, 222-223, 225
Holocene
lithologic units, A:163-169, 207-208, 263, 265
sedimentation rates, A:268
Holocene/Pleistocene boundary
biostratigraphy, A:58
depth, A:63, 170
hornblende, basalts, A:213
hornblende crystals, structures, A:216-217
hyaloclastite
photograph, A:93
pillow lava, A:93-94
structural data, A:107-112
hydrocarbons, aliphatic, sediments, A:284-287
hydrocarbons, polynuclear aromatic, sediments, A:284-287
hydrocarbons, sediments, A:117, 119, 175, 178, 221-222, 281-282
hydrocarbons, thermogenic, sediments, A:287-289
hydrogen sulfide, sediments, A:117, 119, 178
hydrology, alteration zones, A:87
hydrothermal alteration
basalts, A:213-214
boundaries, B10:15
clay mineralogy, B6:7-9
fractures, A:39
lithofacies, A:267-268
magnesium metasomatism, A:259
minerals, A:83
photograph, A:70-75, 77-82, 85-86
pore water, A:279
sediments, A:78-87
sulfides, A:78-87
veins, A:75
zones, A:78-87
See also alteration; chimneys; feeder zones; metasomatism
hydrothermal alteration, anhydrite, zones, A:82
hydrothermal alteration, blue-green clay, zones, A:81-82
hydrothermal alteration, carbonate, zones, A:82
hydrothermal alteration, chlorite, zones, A:82-84
hydrothermal alteration, epidote, zones, A:85
hydrothermal alteration, pyrite, zones, A:85-86
hydrothermal circulation
Middle Valley, A:7-16
models, B9:8, 25
hydrothermal component
chemical composition, A:281
near sulfide outcrops, A:281
hydrothermal deposits, sulfides, A:257-258
hydrothermal fluids
composition, A:113, 173
dissolution, A:117
mineralization, A:258-259
pore water, A:175
hydrothermal systems, sulfides, A:41-42, 52-53
hyperthermophiles
bacterial cells, B2:5-6
vs. depth, B2:14

 

igneous activity, geology, A:12; B10:22
igneous petrology
Site 1035, A:89-102
Site 1037, A:212-214
Site 1038, A:271-272
igneous rocks
grain size, A:212
petrography, A:90-94
vs. depth, A:91
illite
geochemistry, B6:5-6, 14, 17
vs. depth, B6:14-17
ilmenite, bedding planes, A:90
impregnations, structural data, A:107-112
inclusions
massive sulfides, B5:6; 9:5
mineralization, A:69
photomicrograph, B5:19
indenopyrene, gas chromatographs, A:286
index properties
records, A:227
sediments, B7:1-19; B8:34-35
Site 1035, A:125-128
Site 1036, A:187
Site 1038, A:290
vs. depth, A:128, 187; B7:10
induration
structural data, A:112
structures, A:169
interglacials. See glacial/interglacial cycles; Stage 5e interglacial assemblage zone
iodide
pore water, B1:3
vs. depth, B1:7-9
iron. See copper-iron-zinc plots
iron monosulfide, lithologic units, A:209
iron oxide
basalts, A:95, 216
clay minerals, B6:6, 23
vs. depth, A:97
vs. loss on ignition, A:98
iron oxide-magnesium oxide-aluminum oxide plot, chlorite, B6:18
iron oxyhydroxides, hydrothermal circulation, A:10
isocubanite
clastic sulfides, A:59-61
hydrothermal circulation, A:11
massive sulfides, A:66, 269-270; B5:5-6
photograph, A:73-75, 88
photomicrograph, A:68, 79, 86; B5:16
veins, A:75-76; B9:4-9, 16
vs. depth, B5:15
isoprenoid/alkane ratio, bitumens, A:120
isoprenoids, sediments, A:223
isotopes, apparent age, B4:1-15

 

Juan de Fuca Ridge
bacterial cells, B2:1-18
microbial biomass, B3:1-19
permeability and electrical and thermal properties, B8:1-42
Juan de Fuca Ridge N, physical properties, B7:1-19

 

kerogen, sediments, A:178-179
Klamath Mountains, sediments, A:219

 

laccoliths, mounds, A:256
laminations
lithologic units, A:166-167, 208-210, 266
photograph, A:58, 211
structural data, A:107-112
See also convolute laminations; cross laminations
lanthanum, clay minerals, B6:6, 24
lava flows
basalts, A:212-214
lithologic units, A:44-53
mass balance, A:99
lava tubes, basalt pillows, A:257
leaching, base metals, A:102
lead
hydrothermal alteration, A:39
sulfides, A:88-89
vs. depth, A:89
See also copper-lead-zinc plots
lead isotopes, hydrothermal circulation, A:9
lipids
microbial biomass, B3:1-19
See also phospholipids
lithium
chemical alteration, A:221; B10:19
pore water, A:116, 171-175, 218, 274-281
vs. depth, A:116, 177, 220, 280, 282
vs. magnesium, A:118, 172, 178
lithofacies
alteration, A:265
distribution, A:59
hydrothermal alteration, A:267-268
massive sulfides, A:67
sulfides, A:67-71
turbidites, A:53
Lithofacies A
distribution, A:59
mudstone and siltstone, A:54-56
Lithofacies B
distribution, A:59
siltstone and sandstone, A:56
lithologic units
Central Hill, A:267
Site 1035, A:44-57
Site 1036, A:163-169
Site 1037, A:207-210
Site 1038, A:263-267
Unit I, A:44-53, 163-165, 207-208, 263
Unit II, A:44-53, 166-167, 208, 263, 265
Unit III, A:44-53, 59-61, 208, 265
Unit IV, A:167-168, 208-209, 265
Unit V, A:44-53, 61, 64, 66-72, 209, 265
Unit VI, A:44-53, 73-78, 209, 265-266
Unit VII, A:209-210, 266
Unit VIII, A:210, 266-267
lithostratigraphy
Site 1035, A:44-51
Site 1036, A:163-169
Site 1037, A:207-211
Site 1038, A:263-268
lithostructural units, structural data, A:107-112
lobate structure, basalts, A:272
Logging Unit 1
sediments, A:131
well-logging, A:228
Logging Unit 2, sediments, A:131, 228, 230
Logging Unit 3, sediments, A:131, 230
Logging Unit 4, sediments, A:131-132, 230
Logging Unit 5, sediments, A:132-133, 230
Logging Unit 6, sediments, A:230-231
Logging Unit 7, sediments, A:231
logging units, sediments, A:131-133
loss on ignition
basalts, A:95-96, 215-216
vs. depth, A:97
vs. magnesium number, A:98
vs. major oxides, A:98

 

magnesium
chemical alteration, A:221
clay mineralogy, B6:9
hydrothermal circulation, A:9
hydrothermal component, A:281
mass balance, A:99
pore water, A:113-117, 171-175, 218, 274-281
vs. depth, A:112, 114-116, 176, 220, 276-278, 280, 282; B2:8, 18
vs. elements, A:118
vs. elements and compounds, A:172-173, 178
magnesium number
basalts, A:95-96, 215-216
vs. depth, A:97
vs. loss on ignition, A:98
vs. titanium oxide, A:217
magnesium oxide
basalts, A:95, 216
clay minerals, B6:6, 23
vs. depth, A:97
vs. loss on ignition, A:98
See also iron oxide-magnesium oxide-aluminum oxide plot
magnetic anomalies, hydrothermal circulation, A:10-11
magnetic declination, vs. depth, A:298
magnetic inclination, vs. depth, A:138-139, 200, 235, 298
magnetic intensity
sediments, A:294-295
vs. depth, A:138-139, 200, 235, 298
magnetic susceptibility
correlation, A:128-130
sediments, A:126, 186-188, 225-227, 289-292
vs. depth, A:126, 129, 138, 189-190, 229, 291-294
magnetic susceptibility, low-field, sediments, A:136
magnetic susceptibility anisotropy, sediments, A:136
magnetic susceptibility logs, vs. depth, A:266
magnetite
hydrothermal circulation, A:11
massive sulfides, A:66; B5:5-6
photograph, A:73, 75
photomicrograph, A:271
veins, A:75-76
vs. depth, Site 856, B5:15
See also sphalerite-pyrrhotite-pyrite-magnetite
magnetite, heterogenous, sulfides, A:68-69
magnetostratigraphy, alteration, A:137-139
major elements
basalts, A:95-96
clay mineralogy, B6:23
Mancos Shale, fatty acids, B3:17
manganese
mass balance, A:98
pore water, B1:2, 4
vs. depth, B1:13
manganese oxide
basalts, A:95
vs. depth, A:97
maps, hydrothermal circulation, A:16
marcasite
clastic sulfides, A:59-61
hydrothermal circulation, A:11
massive sulfides, A:269-270
mineralization, A:69
photomicrograph, A:72
veins, A:75
vs. depth, B5:15
See also pyrite-marcasite
marker horizons, photograph, A:165
mass balance, alteration, A:96, 98-101
maturation
bitumens, A:119-120
organic matter, A:178, 285-287
sediments, A:222-223, 225
Mendocino Fracture Zone, geology, A:11-13
mesophiles
bacterial cells, B2:5-6
vs. depth, B2:14
mesostasis
basalts, A:213-214, 271
photomicrograph, A:94, 271
metals
mineralization, A:88
sources, A:89
zoning, A:89
See also alkali metals; base metals
metasomatism. See hydrothermal alteration
metasomatism, magnesium, hydrothermal alteration, A:259
methane
bacterial cells, B2:8
sediments, A:117, 119, 178, 221-222, 281-282
vs. depth, A:119, 223, 284-285
methane/ethane ratio
sediments, A:178, 221-222, 281-282
vs. depth, A:223, 284-285
methyl cyclopentane, gas chromatographs, A:284
methylnaphthalene, gas chromatographs, A:286
methylphenanthurene, gas chromatographs, A:286
mica, lithologic units, A:267
microbes, sediments, B3:1-19
microbiology
Site 1035, A:123-125
Site 1036, A:183-184, 186
Site 1037, A:225
Site 1038, A:288-289
microlites, sills, A:92
microorganisms
community composition, B3:9-12
microbial biomass, B3:1-19
sediments, A:123-125, 183-184, 186, 225, 288-289
See also bacterial cells; Eubacteria
microphenocrysts, photomicrograph, A:94
Middle Valley
bacterial profiles, B2:1-18
bathymetry, B10:3, 30
comparison with Escanaba Trough, A:7-16; B10:23-24
hydrothermal field, B10:3, 39
massive sulfides, B10:7-17
microbial biomass, B3:1-19
site description, A:35-203; B10:1-39
mineral chemistry, massive sulfides, B5:1-34
mineralization
stratigraphy, A:46-51
sulfides, A:58-89, 259; B10:10-11
mineralogy
clay minerals, B6:1-24
hydrothermal alteration, A:83
massive sulfides, A:269-270
molds
alteration zones, A:82
lithologic units, A:52
photograph, A:80
mounds, hydrothermal circulation, A:8-9
mud
lithologic units, A:208-209
photograph, A:57
mud, hemipelagic, lithologic units, A:208-209, 263, 265
mud clasts
clastic sulfides, A:59
photograph, A:60
mudstone
Lithofacies A, A:54-56
lithologic units, A:265
photograph, A:61, 77, 100
sills, A:90-93