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[Italic Page Numbers Indicate Major References] Abra Pampa, 191

[Italic Page Numbers Indicate Major References] Abra Pampa, 191

Index [Italic page numbers indicate major references]

Abra Pampa, 191 amygdules, 84, 97 andesine, 160 Absaroka Range, 206 Anallajchi , 248 , 14, 39, 47, 52, 54, 59, 64, absarokites, 202, 204, 206, 208, 213, Ananea basin, 270 70, 94, 116, 122, 125, 127, 133, 267, 269 Ancasti, 197 135, 182, 221, 223, 227, 248, accretionary prism, 271 Ancud-Rio Chubut lineament, 30 251, 254, 267 acites, 268 Andean arc, central, 237 basaltic, 59, 63, 94, 98, 122, 125, Andean Batholith, 39 134, 234, 248, 249, 251, 268 , 124, 133 Andean belt, 33 flows, 247, 251 , 133 western margin, 31 hornblende, 135, 142 rocks, 117, 125 Andean Central Volcanic Zone, 139 parent, 221 Aeolian Arc, 268 Andean chain, 292, 293, 294, 295 silicic, 126 African plate, 280 paleomagnetic data, 291 tholeiitic, 181 African poles, 294 Andean convergent zone, 260 anomalies aggregates, 203, 253 Andean Cordillera, 35, 38, 39, 40, 41, Bouguer, 281, 285, 288 agglomerates, 47 89, 202, 260, 271 Eu, 52, 104, 106, 126, 127, 134, Agua de la Zorra , 83, 84 central region, 116, 125,132, 134, 171 Agua del Milagro, 248 135 free-air, 281 Aguada de la Perdiz Formation, 186 eastern, 249 gravity, 283 Airy-Heishanen model, 283 main, 30 isostatic, 282, 288 albite, 160 northern region, 116, 125,133, magnetic, 260 Alcohuas pluton, 102 135 thermal, 76 Aleutian plutonic rocks, 124 southern region, 116, 117, 122, , 2, 54 Algarrobal Formation, 100 133, 135 Antarctic-, 2 alkaline suites, 251 western, 245, 256 , 240 allanite, 160 Andean , 115 apatite, 48, 101, 160 deposits, 81 central, 219 aplite, 160 Almafuerte Flows, 292, 298 Andean margin, 140, 219 Appalachians, 80 Alota, 248 tectonic evolution, 39 Araucarioxylon sp., 83 Alpine foreland, 288 , 89 arcs, 280 Andean Orogenic Cycle, 94 calc-alkaline, 267, 268 Bouguer anomaly, 281, 285, 288 Andean plateau, 289 continental margin, 15, 237, 238 eastern, 279, 281, 288 Andean zone deep crust, 189 gravity anomalies, 283 flat-slab portion, 146 early , 189 isostatic anomaly, 279, 282, 288 modern, 114 flat-slab , 134 mass budget estimations, 287 Andean trend, 31 intra-oceanic island, 237, 239 topographic, 285 Andean volcanic front, 57 magmatism, 1, 10, 15, 37, 41, 73, western, 280 , 46, 54, 58, 207, 218, 219, 88, 100, 134, 158, 159, 191 alteration, 85, 97 239, 240, 259 plutonism, 4, 11 , 157, 210, 233, 245, 249, , 86 segmented, 4 260, 266, 267, 273, 289 Bouguer anomaly, 281, 285, 288 volcanics, 175, 238 geochemistry, 160 central, 4, 113, 179, 186, 217, 218, Arentica stratocones, 248 geochronology, 159 233, 234, 237, 240, 242, 255, area, 234 modeling, 168 264,273,279, 289,291 Arequipa Massif, 245 plutonic complexes, 157 evolution, 39 Arequipa volcanics, 239 rock types, 160 fore-arc basins, 267 , 13, 87, 100, 117, 186 , 247 gravity anomalies, 283 central, 79 Altiplano belt, 175 isostatic anomaly, 279,282, 288 northwestern, 189,201, 260 Altiplano-Puna region, 289 magmas, 218, 233 Argentine foreland, 190, 191 Altiplano-Puna Volcanic Complex , 115 Argentine sector, 36 (APVC), 218,227 mass budget estimations, 287 Argentinian Puna, 245 Altos de Pica Formation, 247 , 2, 4, 10, 16, 100 Argomedo Beds, 186 Amazon plain, 269, 273 plutonic cycle, 32 Arica Bend, 248, 249 Amazonian foothills, 260 plutonic rocks, 31 Arica deflection, 291 Amazonian slope, 268 shortening, 273 Arica elbow, 249 ammonites, 15, 17 south-central, 201 Arica lithospheric block, 249 --Hualca volcanic southern, 13,15,16, 22, 45, 273 assimilation, 70, 229, 268 complex, 261 tectonics, 29, 264 asthenosphere, 58, 59, 108 , 98, 105, 124, 193, 196, topographic heights, 285 Atacama, 202 205 volcanics, 45 Atacama system, 159, 280 amphibolite, 193 western, 245, 248, 249, 251, 252, Atajaña Formation, 295 , 130 254, 255 Ataña collapse, 248

301

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Atana , 229 , 202, 225, 245, 255 Cerro Chacay andesites, 117 augite, 84, 202, 203, 251 Bolivian Altiplano, 260, 266, 267, Cerro Chorrillos volcano, 202 Austroalpine region, 280 289 geochemistry, 207 avalanche deposits, 248 Bolivian oroclinal hypothesis, 292, mineralogy, 204 Avaroa Formation, 247, 251 295 petrography, 202 Avaroa horst, 249 Bolivian orocline, 245, 248, 249, , 84, 117, 122 Ayacara Formation, 31 255, 271, 291 lavas, 133 Ayacucho basin, 260, 266, 273 Bonete lavas, 251, 255 Cerro Corina caldera, 248 Ayacucho Formation, 266 Bouguer anomalies, 281, 285, 288 Cerro de las Tórtolas Formation, 116, Ayaviri area, 267 Bouguer gravity field, 281 117, 135, 144 Aysén region, 35 Brazil, 87 andesites, 122, 123 Azerbaijan, northern, 268 Brazilian shield, 263, 271, 274, 283 , 125, 128 Azufre lavas, 63, 64 breccia, 18, 94, 180, 295 lavas, 132 Azurite mine, 251 , 20 samples, 129 Cerro Galan, Argentina, 227, 235 banakites, 202, 203, 208, 269 Cabana Conde village, 261 Cerro Galan complex, 140 Bariloche area, 39 Cadillal Complex, 123 Cerro Guacha caldera, 225 Barranco volcano, 47 Caiti volcano, 248 Cerro Moromoroni, 267 B arrosa area, 234 Cajabamba basin, 266 , 270 volcanics, 239 Calama fault, 202 Cerro Pabellón, 248 basalts, 15, 39, 48, 50, 54, 59, 60, calc-alkaline suites, 251 Cerro Pucara, 251 63, 79, 83, 89, 94, 108, 135, calcite, 94 Cerro Pulido andesites, 122, 133, 134 237, 239, 241, 249, 268 caldera collapse, 48, 247, 248 Cerro Pulido volcanic complex, 116 back-arc, 86, 134 caldera complexes, resurgent, 219 Cerro Zapata area, 16, 79 calc-alkaline, 267 Californian trench, 270 Cerros Bravos, 142, 143 flows, 267 Callejon de Huaylas, 267 Cerros del Vetado Complex, 159, 172, komatiitic, 181, 185, 186 Camaraca Formation, 293 174 mid-ocean ridge, 122 Camaraca Pole, 293 cesium, 48 middle ocean ridge (MORB), 48 Canal Baker area, 4, 10 Chacheuta Formation, 82 oceanic island (OIB), 48, 122, 123 Cantarito, 125 , 35 , 85, 87, 116 Cantarito ignimbrite, 117, 126 rhyolite, 48, 50, 54 parental, 70 Caiiani, 192 Chaitén volcano, 31, 46, 47, 48 pillow, 31, 181, 182 Cafiapa range, 248, 249 Chanaral Complex, 159, 172 plateau, 30 Cafiapa volcano, 248 Chanaral-El Salvador area, 158-160 sills, 83, 84 Capurata stratovolcano, 248 chert, 17 tholeiitic, 16, 86, 181 Carangas Massif, 251 chert-argillite, 17 true, 234 Carangas Quadrangle, 247 , 13, 31, 41, 87, 249 carbonate, 189, 191 central, 93,99, 107 cratonic, 80 Caspana area, 219 northern, 157,179, 186, 225, 234, crystalline, 30, 31, 192, 245 Caspana ignimbrite, 218, 219, 226, 248 metamorphic, 30 229 northernmost 239 metasedimentary, 158, 165 Caspana chamber, 227 southern, 2 basins, See also specific basins Catreleo, 39 volcanics, 252 behind-arc, 158, 176 Cavilolen unit, 101, 106 Chile Margin triple junction, 2 extensional, 87 volcanics, 54 Triple Junction, 2, 58 fore-arc, 271 Cayara Formation, 247 Chile Trench, 58 formation, 108 Cayutue unit, 36 Chilean Andes, 100, 103 inversion, 158 , 245,247 Chilean Central , 58 marginal formation, 15 Central Andean margin, 271 Chilean Lake Region, 32, 35, 39 proto-marginal, 13, 22, 24 Central Batholith, 38, 39, Chilean margin, 89 pull-apart, 158 41 rhyolitic, 16 Central Valley, 30, 31 accretion, 198 rift, 22, 80, 87 Central Volcanic Zone (CVZ), 116, basement, 104 submarine, 13, 16 122, 139,140, 143, 218, 219, rocks, 100 batholith 233, 260 chlorite, 85, 94, 192 development, 4 geochemistry, 143, 234 Choiyoi complex, 133 southern Patagonian, I igneous rocks, 238 Choiyoi -rhyolite province, 80, Beazley basin, 80, 82 , 218 88 belemnites, 15, 17 lavas, 131, 237 , 81, 88 Belén area, 234 magmas, 234, 237, 238 Choiyoi , 88 Belén-Choquipina terrains, 245 northern, 234 Choiyoi series, 38 Benioff Zone, 58, 245, 251 petrogenesis, 241 Chollay unit, 100, 101, 102 Benioff-Wadati zone, 260 southern, 133, 144, 234 Chon-Aike series, 38, 40 Berenguela Sandstone Formation, 247 southernmost, 149, 152 Choshuenco volcano, 240 Berlin group, 160 tectonics, 140 Chulee Formation, 297 , 36, 94, 101, 160, 167, 174, volcanic rocks, 237, 240 Cifuncho Complex, 159, 166, 171, 192, 225, 234, 249, 251 Cerke stratovolcano, 248 174 blastomylonites, 101 Cerro Aconcagua volcanic rocks, 136 cinder cones, 47, 241 Bohemian Massif, 280 Cerro Cadillal volcanic complex, 117 Cladophlebis sp., 83

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clastic-flow deposits, 19 deformation, 261 rhyolite, 52 clasts, 20, 21 growth, 237 detritus, 17 clays, 247 lower, 54, 59, 70, 73, 76, 89, 130, epiclastic, 17 clinopyroxene, 36, 48, 62, 64, 74, 84, 134, 135, 146, 210, 289 diabases, 94 129, 181, 182, 203, 204, 251 magmatic differentiation, 140 diastrophism, 247 Coast Belt, 99, 101,106, 108 melting, 89, 108 Dicroidium, 83 Coast Ranges, 30, 40, 41, 99, 101 middle, 89 odontopteroides, 83 Coastal Range, 157, 175 movement (vertical), 288 differentiation, 210,234,239 geochemistry, 160 oceanic, 58, 59, 235, 280 crustal, 145, 146, 152 geochronology, 159 quasioceanic, 98 deep-level processes, 239 modeling, 168 radiogenic, 4 high-pressure, 70 plutonic complexes, 157 recycling, 58 low-pressure, 68 rock types, 160 sources, 131 magmatic, 140, 186, 237, 238 Coastal Volcanics, 294, 295 subducting, 58 mantle-to-crust mechanism, 237 Cochiguas unit, 100, 101, 109 thick, 148, 219, 240, 245 dikes, 94, 107, 180, 267 Cocos plate, 270 thickness, 124, 132, 133, 140, 151, andesitic, 261 coladas basalticas, 202 240 dacitic, 125 Colan Conhue, 39 thickening, 59, 64, 74, 113, 115, felsic, 99, 101 Colima volcanic center, 213 116, 135, 147, 219, 239, 240, , 9, 99, 101, 103, 105, 106, collisions 255, 256, 281 107, 109 , 2 thin, 240 diopside, 196, 212 continent-continent, 280 thinning, 108, 180 , 35, 36, 158 ocean-continent, 279 upper, 38, 54, 59, 68, 76, 89, 130, discontinuity Collon Cura Formation, 37 145, 213, 235, 249, 252, 255 tectonic, 152 Colorado volcano, 47 crystallization, 62, 68, 70, 101, 105, volcanic, 140 compressional tectonic events, 264 123, 148, 212, 227, 230 dolerates, 94 cones assimilation-fractional, 235 domes, 260 cinder, 241, 248 fractional, 62, 74, 132, 145, 166, resurgent, 248 parasitic, 248 168, 183, 186, 220, 223, 226, silicic, 219 scoria, 247 229, 234, 239, 252, 256, 268 Doña Ana, 125 conglomerates, 17, 81, 245, 247 olivine, 128 andesites, 122, 133 Coniri Formation, 266 crystals, 21, 161, 203 ignimbrites, 117 convergence, 89 cumulus, 166 volcanic rocks, 132, 134, 148 rate, 271, 273 , 160 Doña Ana Formation, 116, 117, 127, cordierite, 101, 165, 270 porphyritic, 84 135 Cordillera , 206 Doña Ines, 148, 152 eastern, 251, 283 sanidine, 205 Doña Ines Chica Complex, 159, 172 western, 248, 249, 252 cumulates, 180, 196 , 267 inclusions, 239 , 262 Cordillera Blanca batholith, 268 currents, turbidity, 180 Easter Hot Line, 140 Cordillera Darwin, 15, 16, 22, 24, 40 Cushamen Formation, 39 El Bolsón, 32 northern flank, 16 Cuya dike swarm, 297 El Colorado unit, 100, 101 Cordillera de los Andes, 291 , 79, 88 El Fraile pluton, 102 Cordillera Frontal, 100 basalts, 79 El Guindo , 101 Cordillera Occidental, 261, 266, 268, rifting, 79 El León unit, 100, 101,104 273 sag phase, 82 El Maitén belt, 31 Cordillera Oriental, 261, 267,268, tectonics 87 El Molino Formation, 247 273, 274 Cuyo rift, 89 El Negrillar, 202 Cordilleran arc, 76 Cuzco area, 260, 261, 262 El Quereo Formation, 93 Cordon Caulle rhyolite, 52 elements Cordón de Lila, 179, 186 dacites, 47, 52, 59, 64, 68, 116, 122, actinide, 52 geochemistry, 182 126, 135, 142, 183, 222, 227, alkaline, 48, 50 lavas, 180,182 240, 248, 251, 254, 267 ferromagnesian, 50 petrography, 180 Darwin orogenic complex, 9 heavy rare-earth, 62, 73, 103, 104, Cordon de Lila basin, 186 debris 105, 107, 124, 125, 146, 174, Cordón de Lila Complex, 179 andesitic, 15 183, 213 Corral del Alambre Complex, 159, 172 flow deposits, 17, 19, 20, 21, 22 high field strength, 54 , 31, 291 rhyolitic, 13, 17, 19 incompatible trace, 122 Crucero basin, 267, 270 declination deviation, 292, 295 large ion lithophile (LIL), 234, 237 crust, 125,237 deformation, 17, 81, 180, 191, 192, light rare-earth, 97, 105, 124, 146, assimilation, 62 195, 197, 273 174, 210, 214, 220 contamination, 10, 54, 62, 70, 73, compressional, 116, 135, 260, 263, middle rare-earth, 103, 104, 105, 75, 87, 115, 123, 133, 135, 145, 266, 271, 273 107 148, 152, 212, 215, 235, 237, extensional, 263 rare-earth, 50, 62, 106, 134, 160, 238, 240, 252 foreland, 190 171, 174, 183, 186, 213, 220 continental, 2, 42, 48, 54, 58, 61, post-magmatic, 9 Elqui superunit, 100 74, 79, 100, 202, 212, 233, 235, shortening, 266 Elqui-Lamari batholith, 100, 101 237, 242, 245, 252 stretching, 266 epidote, 94, 160 deep, 128, 189, 214, 241, 242 depocenters, 80 Equatorial , 271

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erosion, 17, 24, 59, 116, 280 fluvial deposits, 82 High Andes Belt, 99, 100, 102, 104, basement, 17 folding, syndepositional, 266 107, 108 rates, 233 fossils, freshwater, 83 High Cordillera, 179 eruptions, 21, 247, 248 fractionation, 166, 183, 208, 214, High Plateaus, 267, 268 explosive, 18 225 hornblende, 36, 101, 148, 160, 168, phreatomagmatic, 24 clinopyroxene, 134 174, 222, 225, 234, 249, 251 phreatoplinian, 24 convective, 226, 228, 230 hornblende , 7 plumes, 18 crystal, 130, 134, 225, 226, 239, Hornopirén andesite, 50, 52 pyroclastic, 228 241 Hornopirén volcano, 31, 46, 47, 48 eruptive centers, 247 crystal-melt, 70 horsts, 249 eruptive drawdown, 228 hornblende, 152 hot springs, 248 Escala volcano, 251 olivine, 134, 186 Hualaihué , 50, 52, 54 Estación Avaroa, 251 Frontal Cordillera, 81, 124 Hualaihué volcano, 46, 47, 48 Estancia Kolke-Uma, 251 , 248 Huallaymarca range, 249 Eurasian plate, 280 Futaleufu Formation, 40 Huambo village, 261 evolution Huambo-Cabana Conde faults, 261 magmatic, 29 gabbro, 7, 100, 103, 158, 267 penological, 245 Huari lava flows, 260 gabbronorite, 7, 193, 196 tectonic, 39, 88, 245 Hudson volcanics, 54 gaps expansion, 270 volcano, 31, 47 compositional, 266, 229 hypersthene, 193, 196, 203, 251 extension, 13, 23, 89, 107, 110, 186, volcanic, 58 268 garnet, 74, 104, 105, 115, 124, 128, ignimbrite fields, 14 back-arc, 2 165, 194 ignimbrite provinces, 219 intra-arc, 2 control, 146, 152 ignimbrite shield, 221 regional, 14 residual, 74, 76 ignimbrites, 37, 39, 93, 116, 123, garnet amphibolite, 130 135, 202, 219, 229, 247, 248 facies garnet granulite, 59 central Andean, 217 flysch, 186 Gastre area, 37, 38, 41 dacitic, 234 fore-arc, 158 , 38 emissions, 248 granulite, 192 General Alvear, 81 hyodacite, 248 greenchist, 192 geochemistry, 85, 94, 99,102, 157, monotonous, 218, 219, 227 marine, 93 160, 182, 207, 234 , 248 neritic platform, 186 geochronology, 32, 38, 159 , 248 Faja Eruption, 198 glass, 48, 204, 220, 221, 223 rhyolite, 248 Faja Eruptiva, 191 gneisses, 37, 39, 239, 245 zoning styles, 217 Famatina system, 191 , 14, 88, 98, 100, 189 Ignimbritic Formation, 248, 255 Famatinian cycle, 186 breakup, 14, 79 ilmenite, 129, 193, 196, 204, 225 fanglomerates, 81 margin, 190, 198 Incacamachi volcano, 251 faults grabens, 249 Incaic compressional event, 264 detachment, 88 granite-rhyolite provinces, 79 Infiernillo unit, 116, 127, 132 en echelon, 249 , 30, 32, 35, 38, 40, 42, 79, andesites, 122 high-angle, 117 100, 103, 105, 107, 109, 158, samples, 117 master-normal, 80 160, 171 Inguaguas superunit, 100, 101, 102 normal, 81, 261, 262, 267, 273 I-type, 165 Inoceramus, 17 reverse, 116, 191, 192, 198, 266, S-type, 165 volcano, 248 273 two-mica, 100 Ischigualasto basin, 80 strike-slip, 30, 37, 202, 266 granitoids, 30, 31, 32, 36, 37, 38, 40, -Cabaraya-Sacsani-Pumiri thrust, 266 41, 46, 102, 103, 245 lineament, 248 fauna, marine, 93 , 35, 36, 38, 39, 99, 100, Isluga-Cabaraya- feldspar, 21, 128, 203, 204, 213 101, 102, 106, 128, 158, 160, lineament, 251, 253, 254, 256 felsites, 37 171, 172 isostasy, 124 ferrohedenbergite, 101 granulites, 104, 193 ferro-hornblende, 101 graywackes, 41, 47, 93 Formation, 135 Fiambalá Gabbronorite, 192, 196,198 greenschist facies, 16 Jotabeche volcanic complex, 117, Fish Canyon Tuff, 227 Guanta unit, 100, 101, 104 123 flat-slab region Jotabeche-Cadillal Complex, 133 central, 116, 125,132, 134,135 Hacienda Vieja pluton, 102 Juan Fernandez Ridge, 58, 74, 116, magmatic history, 135 Hacienda Vieja unit, 100, 101, 104, 136, 140, 150 modern, 116, 124, 131, 135 109 Julaca lavas, 248 northern, 116, 125,133, 135 half grabens, 89 , 13, 22, 99, 291 southern, 116, 117, 122, 133,135 Handy Formation, 15 Early, 37 flows Hartford basin, 81 Lower, 101 andesitic, 116, 247, 251 Hawaiian lavas, 256 Middle, 101 basaltic, 247, 267 heat flow, 39 Upper, 101 lava, 93, 202, 248, 251, 260 heat transfer, 228 stratovolcano, 248, 251 mafic, 82, 83 Helvetic, 280 pyroclastic, 140 Herradura rocks, 298 Kakella volcano, 248 rhyolite, 251 High Andean Cordillera, 271 Kollukollu Formation, 247 volcanic, 297 High Andes, 100, 261, 266, 273 keratophyres, 97

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La Ola Complex, 159, 172 Lower Quehua Formation, 247 changing, 131 La Pantilla orthogneiss, 192, 195, 196 magma chambers, 235 melting, 60, 88, 135 La Paz basin, 267 aspect ratio, 228, 230 presubduction, 134 Lachian fold belt, 165 closed, 230 primitive, 183 lacustrine succession, 158 compositional layering, 225 source , 74, 239 Lago Moquehue, 38 evolution, 218, 228 sub-arc, 241 Lago Panguipulli, 38 homogeneous, 218, 228, 230 subcontinental lithospheric, 238, Lago Puelo, 39 processes, 217 239 Laguna Cachi, 248 zoned, 228 upper, 183, 237 Laguna Colorado, 248 magmagenesis, 239 wedge, 176, 235, 241 Laguna del Maule rhyolite, 52 magmas, 4, 11, 39, 58, 59, 75, 100, Maquinas basalts, 86 Lake Titiaca, 260 104, 107, 128, 133, 146, 176, Marayes basin, 80 lamprophyres, 213, 239, 267 185, 221, 223, 240, 253 Marcapata-Quince Mil area, 267 , accretionary, 24 arc, 58, 73, 237 margin Las Cabras Formation, 81 basaltic, 105 active continental, 2 Las Máquinas basalts, 123, 131, 134 baseline, 238, 240, 241 western continental, 13 latites, 269 calc-alkaline, 10, 238 Mariana Volcano-Izu Arc, 238 lavas, 57, 62, 76, 85, 97, 115, 147, central Andean, 233 Marifil Complex, 293 180,182, 247, 249, 251 erupted, 240 Marifil Group, 37 acid, 94, 98 felsic, 9, 105 marine incursions, 13 alkaline, 209 flat-slab, 135 lavas, 133 andesitic, 234, 251, 252 generation, 75, 109 Marmalejo-San Jose volcano, 240 arc, 235 high-silica, 166 Marmolejo-San Jose lavas, 70 homogeneous, 228 basaltic, 18, 239 mass budget estimations, 287 I-type, 253 calc-alkaline, 256, 268 mass deposits, 19 ignimbrite, 228 dacitic, 234, 239 massifs, volcanic, 202 leucogranite, 110 evolved, 70 Mauri Formation, 247, 248, 253 mantle-derived, 10, 11, 176, 219, flows, 47, 93, 202, 248, 251, 260 mélange, 158 intra-oceanic island arc, 237 235, 238 melting, 74, 89, 104, 129, 147, 183, mafic, 15, 186, 208, 256 mixing, 70, 213, 235, 239 186, 240, 252 mugearite, 249 models, 59 batch, 186 pillow, 18 parental, 9, 70, 97, 218, 227, 240, eras tal, 133, 135, 218 , 201 252 partial, 60, 74, 128, 130, 146, 214, rhyolite, 21, 24, 39, 270 primary, 74 , 270 237, 238, 253, 256, 268, 273 shashonitic, 201,204,207,210 primitive, 238 melts, 167 silicic, 24, 38 production, 147 lower-crastal, 238 sub-alkaline, 247 recharge, 234 partial, 239 trachyte, 248 rhyolitic, 24 primitive, 237 ultrapotassic, 212 silicic, 15, 18, 24, 218, 219 Mencué-Chasicó area, 38 Leon volcano, 219 source, 113,233 granitoids, 38 leucogranites, 33, 36, 37, 38, 39, 99, subduction-related, 235 Mendoza, Argentina, 80 101, 102, 104, 105, 106, 109, volcanic arc, 235 Mesón Group, 186 160, 171, 172 magmatic arc, 249 mesoperthites, 101 leucogranitoids, 107 magmatism, 4, 29, 41, 58, 76, 88, 89, , early, 40 leucogranodiorites, 99 100, 101, 107, 114, 130, 133, meta-andesites, 182 stratovolcano, 248 159, 234, 238, 259, 267, 270 metagranites, 245 limestone, 297 alkaline, 267, 268, 273 metamorphism, 38, 41, 97, 158, 191, volcano, 248 arc, 10, 15 192, 195, 197 Linzor-Panizo-Licancabur lineament, calc-alkaline, 268, 274 burial, 180 249 felsic, 269, 273 metasandstones, 47 Lipez ignimbrites, 249 granitoid, 40 metasediments, 158, 193 Lipez region, 245, 247, 248, 251, ignimbrite, 228 micaschists, 47 253, 255 mafic, 273 basalt, 48, 50, 52, 54 Liquiñe-Ofqui fault, 30, 31, 39, 46, 47, peralkaline, 267, 269, 273 Michinmahuida volcano, 31, 46, 47, 54 plutonic, 35 48 Lircay, 266 postcollisional, 42 microcrysts, 48 , 40, 58, 59, 80, 100, 108, silicic, 219 microlites, 181, 204 235, 237, 240, 242, 260 magmato-sedimentary complex, 179 microphenocrysts, 94, 202, 203, subcontinental mantle, 237, 238 magnetite, 84, 129, 203 204 Loma Doña Ines magmas, 148 Main Andean Cordillera, 114 migmatites, 39, 41 Longitudinal Valley, 283 Main Cordillera, 35, 116, 122, 123, migration, 150, 249 Los Bracitos pluton, 102 124, 135 unidirectional, 4 Los Carricitos, 100 volcanic history, 116 Millahue granitoid unit, 101, 103, Los Frailes Formation, 249 lava, 70 106, 109 Los Molles Formation, 93 Maipo volcano, 48 mineralogy, 204 Los Tarros Formation, 297 Mamil Choique Formation, 39 residual, 128 Los Tilos pluton, 101 mantle, 14, 58, 59, 70, 75, 89, 116, minettes, alkaline, 239 Los Vilos succession, 89 125, 147, 210, 237, 252 , 116, 147, 247, 268 Lower Purico ignimbrite, 218, 221 asthenospheric, 237 earliest, 267

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early, 117, 264 opaques, 48, 94 Peninsula Brunswick area, 16 late, 122, 264 ophiolite segments, 15 Penninic, 280 middle, 117, 264 Ordovician, 179 peperites, 17, 24 Mocha Fracture Zone, 58 Oropesa volcano, 260 rhyolite, 20 Mocho volcano, 240 orthogneisses, 39 peralkaline plugs, 269 Mocho-Choshuenco lava, 64 orthopyroxene, 48, 148, 181, 196, Perez Formation, 248 Mocho-Choshuenco volcanic 204 Perez Formation plateau, 248 complex, 70 Oxapampa area, 268 peridotite, 31, 74, 210 models Oxaya Formation, 249 Permian, 157,159 Central Volcanic Zone, 237 oxides, 160, 166 , 202, 259 magma, 59, 237 central, 268, 269 magmatic inflation, 10, 11 Pabellon graben, 249 northern, 269 mantle lithosphere, 238 Pacana caldera collapse, 248 south-central, 269 melting, 128 Pacific coast, 93 southeastern, 267 quantitative, 239 Pacific Lowlands, 261, 266, 273 southern, 234, 239, 260, 267, 269, residual mineralogy, 128 Pacific margin, 14, 22 273 Southern Volcanic Zone, 59, 75 Pacific-Farallon spreading center, 270 southernmost, 269 Molasse zone, 280 palaeomagnetism, 291 Peru-Chile Trench, 2, 260, 270, 271, Montandon, 158 Palca II mine, 270 281 Montandon Complex, 159 paleoenvironments, 13, 17 Peruvian Andes, 259 Monte Grande pluton, 101, 102, 105 paleogeography, 191 magmatic activity, 260 Montes de Oca Formation, 40 paleomagnetic poles, 292, 294, 295, stress state, 260 monzogabbro, 267 297, 298 Peruvian fore-arc, 267 monzogranites, 269 Paleozoic, 41 Peruvian margin, 267, 268 hornblende, 101 early, 39, 189 Peruvian orogenic phase, 247 Moracoche rocks, 298 late, 38 petrogenesis, 42, 98, 241 Mucusani ignimbrites, 270 Pampa Chamaca caldera collapse, 248 petrography, 48, 84, 94, 180, 202 mudstones, 15, 17, 18, 19, 83 Pan de Azucan Complex, 159, 171 petrology, 201, 245 black, 19, 20, 22, 24 Pangea, 280 , 48, 64, 94, 104, 105, marine, 19, 20, 22, 24 Panguipulli Formation, 32 202, 204, 222, 249, 251, 270 veinlets, 20 Panguipulli-Pirihueico district, 32 biotite, 142 mugearites, 251, 255, 256 Pannonian area, 288 clinopyroxene, 212 muscovite, 160, 193, 270 Papudo, 102 olivine, 202, 203, 212 mylonites, 47 Papudo-Quintero, 102 phlogopite, 208, 212 Paramillos basalts, 86, 88, 89 phlogopite, 203, 205 Nahuelbuta Mountains, 30, 38 Paramillos de Uspallata region, 80, 81 phenocrysts, 208, 212 Nahuelniyeu area, 39 basalts, 80 phyllite, 17, 47 Namora basin, 267 geochemistry, 85 Phyllotheca australis, 83 Napa volcano, 248 mafic rocks, 83 Pianchdn-Peteroa, 132 Nazca Plate, 2, 46, 48, 54, 58, 140, petrography, 84 Pichidangui Formation, 93 149, 237, 245, 247, 249, 251, Paramillos sills, 87 geochemistry, 93 256, 260, 270, 279, 289 Parana basalts, 86 petrography, 94 , 271 pargasite, 205 tectonics, 93 Negrillos Formation, 247 Pariatambo Formation, 297 Pichidangui lavas, 94 Neuquen basin, 30 Parinocota stratovolcano, 248 pigeonite, 48 Nevados de , 239 Patagonia, 40, 42, 209 Pilcaniyeu belt, 31 Nevados de Payachata lavas, 238 central, 38 Pino Hachado-Picun Leufu lineament, Nevados de Payachata trend, 234 northern, 39 30 Newark basalts, 86 Patagonian Andes, 2 Pircas Negras Newark basin system, 81, 86 Patagonian batholith, 15 andesites, 123, 124, 125, 128 North Patagonian Massif, 30, 37, 39, Patagonian batholith (northern), 39 dacites, 133 40, 41 geochronological data, 31 lavas, 133 Northern Patagonian Batholith, 30, magmatic evolution, 29 samples, 129 31, 38 morpho-tectonic divisions, 30 Pircas Negras Group, 135 Northern Patagonian Cordillera, 33 tectonics, 29 Pisco, 267 Northern Volcanic Zone (NVZ), 260 Patagonian batholith (southern), 1 age, 7 plagidacites, 181, 182, 183 plagioclase, 48, 62, 64, 84, 94, 101, region, 133 geochronology, 4 104, 106, 129, 130, 142, 160, Ojos del Salado volcanic complex, 140 lithology, 7 167, 174, 181, 186, 196, 204, Ojos del Salado volcano, 125, 140, spatial variation, 1 219, 222, 225, 234, 249, 251 152 temporal variation, 1 Planchon basalts, 73 Okmok Volcano, 129 Patagonian cap, 20 Planchon lavas, 62, 63, 64, 71, 74 Patagonian platform, 292, 293, 294, Planchon-Azufre volcanic center, 62 late, 117, 259, 262, 264, 267, 270 298 plate boundaries latest, 269 paleomagnetic data, 291 convergent, 58, 249 oligoclase, 94 Payachata volcanoes, 249 subducting, 4 olivine, 48, 64, 84, 135, 202, 204, Pedernales Complex, 159, 172 plate convergence, 249 234, 251 pelecypods, 15 plate dynamics, 270 Ollague volcano, 248, 249 pelites, 42 Pleistocene, 248

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early, 264 crystals, 206 igneous, 30, 36, 100, 103, 237, Plinian base, 219 vein, 17 238, 298 Plio-Quaternary, 269 xenocrysts, 206, 213 intrusive, 102, 104, 106, 190, 191, Pliocene, 146, 248, 269 quartz diorite, 7 195, 198, 269, 270 early, 264 quartz monzodiorite, 7 mafic, 2, 7, 9, 10, 79, 80, 83, 87, plumes, eruption, 18 Quaternary, 45, 201, 248 134 plutonic belts, 99, 100 Quebrada Dona Ines Chica, 158 magmatic, 113, 124, 125, 131, 133, plutonic complexes, 157 Quebrada Las Animas, 158 267, 268 Permian, 157, 159 Quemez Formation, 248 marine, 16 Triassic, 157, 159 Quenamari stocks, 269 metamorphic, 30, 39, 47, 100, 190, plutonic rocks (bimodal), 101 Quetena horst, 249 202, 253 plutonism, 2, 4, 35, 36, 190 quiescence, 263, 267, 272, 273 metasedimentary, 7, 31, 102, 191, arc, 4, 11 Quince Mil area, 267 192 Early Jurassic, 37 Quintero granite, 102, 106 metavolcanic, 17 early Paleozoic, 39 mylonitic, 46 Jurassic, 99 Radiolaria, 15 oceanic, 80, 108 Late Triassic, 37 rare earth element (REE) patterns, 52, ophiolitic, 2 late Paleozoic, 38 85, 94, 97, 102, 104, 106, 124, plutonic, 9, 31, 37, 39, 47, 100, Triassic, 99 135, 171, 174, 183, 197, 220, 101, 103, 106, 109, 128, 158, plutons, 4, 35, 40, 100, 101, 104, 256, 269 190, 269 107, 267 Recent, 57,146 pyroclastic, 20, 38, 81, 180 emplacement, 11 Red Sea graben, 88 sedimentary, 16, 31, 38, 39, 47, 81, felsic, 2, 4, 10 Red Sea rift, 88 93, 191, 253, 295, 297 gabbro, 267 red beds, 80, 83, 295 silicic, 14, 37, 38, 39, 125, 126 granitic, 192 Reloncavi unit, 36 tholeiitic, 183 intermediate, 2, 7 , 181, 182, 183, 223 tuffaceous, 18 mafic, 2, 4, 10 rhyolites, 13, 15, 20, 24, 40, 48, 54, ultrabasic, 47 peraluminous, 2 64, 68, 70, 79, 94, 98, 117, 126, ultramafic, 196 subvolcanic, 116 227, 249, 251, 268, 270 volcanic, 13, 16, 17, 22, 24, 30, Pocho volcanic rocks, 133 flows, 14, 251 37, 39, 40, 42, 50, 54, 81, 83, polar shift, 293, 294, 295 hypabyssal intrusions, 17, 24 87, 93, 97, 100, 116, 131, 135, polar wander, 88, 292, 294 pillows, 24 140, 143, 148, 191, 234,237, pole determinations, 293 submarine, 16 240, 245, 247, 268, 295 poles of rotation, 294 rift, 86 volcaniclastic, 16, 20 Pomperaug basin, 81 rhyolitic submarine, 23 Rondai Lavas, 247, 248, 249, 254, Poquentica stratocone, 248 volcano-tectonic zone, 15 255 Porcelana volcano, 47 rift basins, 80, 87 Rumichaca Formation, 266 , 252 formation, 80 Rumichaca volcano, 260 potassium-feldspar, 160, 167, 168 rifting, 79, 186 Potoco Formation, 247 Riñihue-Ranco district, 39 Sacabaya volcano, 248 Potoco lavas, 247, 251, 254, 255 Rio Blanco Formation, 82 sag-fill deposits, 80 Potrerillos Formation, 82 Río Cisnes, 22 Sajama caldera, 248, 249, 251, 254 pre-Andian tectonics, 29 Río de los Molinos Dikes, 292, 293 Sajama region, 249, 251, 252, 255, Puente Piedra Formation, 294, 295, Río Elqui area, 101 256 297 Río Liman Bridge, 102 , 191 Puerto Oscuro granitoid unit, 101, Río Mendoza Formation, 81 San Antonio volcano, 251 106 Río Negro area, 268 San Barbolo Group, 219 Pulido Formation, 135 Rocas Verdes complex, 2 San Bartolo, 84 , 19, 21, 24, 219,222 rock series San Jerónimo volcano, 202 dacitic, 225 calc-alkaline, 9, 10, 40, 109, geochemistry, 207 glassy, 225 245 mineralogy, 204 Puna, 260 calcic, 9, 10 petrography, 202 Puna Altiplano, 151 rocks San Jose lavas, 62 Puna of Argentina, 202 acid, 94 San Jose volcano, 240 Puna Plateau, 191, 198 alkaline, 268 San Marcos basin, 267 , 191, 198 arc, 135 San Martin de los Andes, 39 Purico ignimbrite, 218, 221 back-arc, 135 San Pedro volcanic province, 70 Purico , 227 basement, 31, 192, 239 San Pedro volcano, 260 Puripicar ignimbrite, 218, 225, 229 calc-alkaline, 159, 268 San Pedro- trend, 234 Putina synclinorium, 267 calc-silicate, 192, 193 San Rafael stocks, 269 Puyehue lavas, 62, 63, 64, 74 cataclastic, 46 San Sebastian Formation, 266 sandstone, 17, 21, 81, 83, 93, 189, Puyehue volcanic complex, 62 country, 4, 7, 9, 59, 102, 196 213 Puyehue Volcano, 31, 129, 240 crystalline, 190, 192, 198 pyroclastics, 248 epiclastic, 17 sanidine, 205, 249 flow deposits, 20, 21, 22, 24 extrusive, 251, 270 Santa Cruz deflection, 291 , 36, 186, 194, 234 felsic, 2, 8 Santa Lucia Formation, 247 gabbroic, 196 Santa Rose super-unit, 296 quartz, 21, 94, 160, 192, 195, 203, granitic, 47, 174 Santa Victoria Group, 186 204, 213, 225, 249, 251 host, 2 Santo Domingo stocks, 269

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Sarmiento area, 15, 16, 22 lavas, 62 thermometry, 194 Sarmiento ophiolite, 15 magmas, 240 pyroxene, 186 S atipo area, 268 models, 59, 75 tholeiites, 128 schistosity, 31 northern (NSVZ), 59, 62, 64, 70, flood, 239 schists, 38 74, 75, 131, 133 Tierra del Juego region, 4 scoriae, 248 southern (SSVZ), 59, 62, 64, 68, 70, Tilito Member, 127 sea floor spreading, 294 75 Tinguiririca volcano, 132 rate, 4, 10, 176 transitional (TSVZ), 59, 62, 64, 68, titanite, 160 sedimentary-volcanic sequence, 158 70, 74, 75 titanium-magnetite, 225 sedimentation, 247, 267 volcanoes, 240 titanophlogopite, 205 basinal, 266 spilites, 94, 97 Toba, Sumatra, 227 clastic, 186 Staten Island, 16, 20, 24 Tobifera Formation, 2, 14, 15, 20, 22 hemipelagic, 22 stocks, 116, 268 basal epiclastic member, 17, 22 turbiditic, 186 alkaline, 267 facies association, 18 zones, 280 dioritic, 186 , 16 sediments hypabyssal, 180 Tobifera outcrop, 15 clastic, 191 stratocones, 234 Tobifera rhyolites, tectonomagmatic flysch-type, 245 Stratovolcanic Formation, 251, 253 setting, 15 supracrustal, 190 stratovolcanoes, 48, 248, 260 Toconao ignimbrite, 229 seismicity, fore-arc, 260 andesitic, 248 Toconao Quadrangle, 248 serpentine, 84 stress, 260, 271 area, 219 serpentini te, 31 Strombolian eruptions, 248 Toconce Formation, 219 Serra Geral Formation, 291, 298 sub-Andean Lowlands, 262 Toconce volcano, 219 Serrucho-Piltiquitrón district, 32 sub-Andean retroarc foreland, 266, , 7, 35, 36, 101, 104, 128, shale, 81, 83, 93, 247 267, 271, ¿73 158, 160, 172 shortening sub-Andean zone, 260 hornblende, 100 crustal, 248 subduction, 14, 41, 58, 100, 108, 116, tourmaline, 160 structural, 256 134, 150, 191, 192, 233, 235, , 251 tectonic, 219 245, 256, 260, 280 Tranquilla granitoid unit, 101, 103, shoshonites, 202, 203, 213, 267, 268 rates, 40, 248 106, 109 Sierra Almeida, 179 subduction complex, 41 Tres Cruses volcano, 142 Sierra de Ancasti, 192 subduction zone, shallowing, 113 Triassic, 79, 88, 93, 99, 157,159 Sierra de Fiambalà, 189,192,197 subduction-collision hypothesis, 41 Late, 37 deformation, 192 subsidence, 13, 17, 22, 23, 25, 89, Upper, 101 temperature, 194 100, 288 tridymite, 48 Sierra de Guilmes, 192 succession, lacustrine, 158 Tristeza Granite, 37 Sierra de Lipez, 235 suites Tristeza Granite belt, 40 Sierra del Medio, 39 alkaline, 251 tuffs, 22, 180, 247, 270 Sierra Nevada, central, 205 calc-alkaline, 251 acid, 93 Sierras Pampeanas, 116, 191 shoshonitic, 254 ash-fall, 18, 19, 21, 247 northern, 190 , native, 248 ash-flow, 180, 270 , 81 Sunacavi stratovolcano, 248 crystalline, 247 Sierras Pampeanas structural province, Sunda Islands, 205 felsic, 247 58 , 79, 89 ignimbritic, 273 silica, 38, 173, 251 breakup, 14, 15 lapilli, 18, 21, 24 volcano, 248 swarm, dike, 93, 101, 109 monotonous, 230 sillimanite, 270 syn-Collision Granite, 175 pumiceous, 253 slab synrift deposits, 80 rhyolitic, 83 retreat, 271 syn-Tobifera arc, 15 volcanoes, 248, 249 subducted, 245 Turaquiri-Larancagua Massif, 249 slates, 47, 93 fault, 202 turbidites, 15, 17, 19, 20 solfatane deposits, 248 Tambillo Formation, 247 sandstone, 191 Somuncura Batholith, 38, 39, 41 Tastile, 192 tuff, 18, 19 Soniquera caldera, 251 Tata Sabaya stratovolcano, 248 turbidity currents, 19 , 79, 176, 233, 291 Tauern window, 280 southern, 14, 88 Tecka-Tepuel basin, 30 Uncapampa vent, 261 South American coordinate system, tectonics, 93,99,107, 149, 174, 180, unconformity, 14, 16, 247, 263, 264, 294 245, 248, 259, 266, 270, 271, 266 , 2, 46, 54, 247, 291 uplift, 10, 11, 14, 15, 40, 47, 58, 108, 249, 260, 289 Andean, 29 191, 248, 255, 264, 268, 280, South American platform, 292, 294, compressional, 264 288, 289 298 history, 2 Upper Quehua Formation, 247, 248, South Atlantic expansion, 270 inversions, 81 255 South Georgia, 20 pre-Andean, 29 Upper Quehua ignimbrites, 247 Southern Andes Quaternary volcanic tectonism, 2 Uspallata, 80, 117, 133 front (SAQVF), 45 , 18, 21, 24 rocks, 117 Southern Coastal Batholith, 38 Tequetrén Formation, 40 Uspallata Group, 81 Southern Volcanic Zone (SVZ), 58, 74, , 31,135 Uspallata Valley, 117 97, 115, 116, 122, 124, 240, 260 mid-later, 113 Uturuneu volcano, 248, 251

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Vacas Heladas ignimbrite, 116 massifs, 202 arc, 240 Vallecito Formation, 116, 135 Quaternary, 45 shoshonitic, 202 Vallecito ignimbrites, 128 shoshonitic, 255 volcanology, 16 Vallecito rhyodacites, 132 southern Andes, 45 Vulcanitas Cerro Colorado Formation, Variscan cycle, 186 spatial variations, 139 292, 298 Variscan Orogeny, 280 temporal variations, 139 Vulcanitas Cerro Rumipalla Formation, Vienna Basin, 288 volcanism, 2, 13, 24, 31, 39, 59, 94, 292, 298 lava, 64 98, 100, 114, 116, 117, 135, Vulcanitas, San Luis, 292 Villarrica stratovolcano, 48 140, 150, 186, 190, 201, 235, Vinchos rocks, 298 245, 248, 256 , marine, 17 Volcan Copiápo, 143, 152 active, 30, 39 wedge Volcan Copiápo volcanic center, 140 alkaline, 247, 260, 261, 273 accretionary, 159 Volcan Doña Inés, 143, 148, 152 andesitic, 140, 219 asthenospheric, 272 volcanic arc, 98 back-arc alkalic, 59 mantle, 249, 256, 268, 273, 274 calc-alkaline, 260 calc-alkaline, 247 West Gondwana, 89 inner, 255 Cenozoic, 245, 247 Western Euliminar Series, 94 Volcanic Arc Granite (VAG), 175 continental margin, 233 Wheelwright Caldera, 140 volcanic belts, 31 extension-related, 14 Within Plate Granite, (WPG), 175 volcanic centers, 47, 59, 62, 117, ignimbrite, 219 233, 240 intra-arc alkalic, 59 Xaultegua area, 4, 9, 10 volcanic province mafic, 80 xenocrysts, 203, 204, 270 continental, 179 marine, 93 feldspar, 203 Ordovician, 179 penological evolution, 245 quartz, 206, 213 volcanic suite, calc-alkaline, 256 rhyolitic, 13, 22, 24 , 9, 106, 182, 196, 239 volcaniclastics, 191 shoshonitic, 260, 267, 269, 273, volcanics, 81, 108, 190, 191, 248, 274 volcano, 31 249, 254, 256 silicic, 13, 22, 40, 42, 80, 218 Yumagual Formation, 295, 297 activity, 140, 186, 255 submarine, 13 calc-alkaline, 15, 226 tectonic evolution, 245 Quadrangle, 248 deposits, 180 volcanoes, 31, 58, 62, 76, 140, 147, zircon, 48 gaps, 58 202, 240, 260 zonation, compositional, 227, 230

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Andean Magmatism and Its Tectonic Setting Edited by Russell S. Harmon and Carlos W. Rapela Contents Preface v 1. Temporal and Spatial Variations in the Southern Patagonian Batholith; Constraints on Magmatic Arc Development 1 R. M. Bruce, E. P. Nelson, S. G. Weaver, and D. R. Lux 2. Submarine Rhyolitic Volcanism in a Jurassic Proto-Marginal Basin; Southern Andes, Chile and Argentina 13 R. E. Hanson and T. J. Wilson 3. The Magmatic Evolution of Northern Patagonia; New Impressions of Pre-Andean and Andean Tectonics 29 C. Cingolani, L. Dalla Salda, F. Hervé, F. Munizaga, R. J. Pankhurst, M.A. Parada, and C. W. Rapela 4. Geochemical Features of Southern Andes Quaternary Volcanics Between 41 °50' and 43°00'S 45 L. Lôpez-Escobar, M. Tagiri, and M. Vergara 5 Recent Lavas from the Andean Volcanic Front (33 to 42°S); Interpretations of Along-Arc Compositional Variations 57 D. R. Tormey, R. Hickey-Vargas, F. A. Frey, and L. Lôpez-Escobar 6. Triassic Rifting and Associated Basalts in the Cuyo Basin, Central Argentina 79 V. A. Ramos and S. M. Kay 7 The Pichidangui Formation; Some Geochemical Characteristics and Tectonic Implications of the Triassic Marine Volcanism in (31 °55' to 32 °20'S) 93 M. Vergara, L. Lôpez-Escobar, A. Cancino, and B. Levi 8. Geochemistry of the Triassic to Jurassic Plutonism of Central Chile (30 to 33°S); Petrogenetic Implications and a Tectonic Discussion 99 M. A. Parada, B. Levi, and J. O. Nystrom 9. Magma Source Variations for Mid-Late Tertiary Magmatic Rocks Associated with a Shallowing Subduction Zone and a Thickening Crust in the Central Andes (28 to 33°S) 113 S. M. Kay, C. Mpodozis, V. A. Ramos, and F. Munizaga 10. Spatial and Temporal Variations in Volcanics of the Andean Central Volcanic Zone (26 to 28°S) 139 J. A. Walker, T. N. Moulds, M. Zentilli, and M. D. Feigenson 11. Comparative Geochemical Interpretation of Permian-Triassic Plutonic Complexes of the Coastal Range and Altiplano, 25°30' to 26°30'S, Northern Chile 157 M. Brown 12. The Cordon de Lila Complex, Central Andes, Northern Chile; An Ordovician Continental Volcanic Province 179 K.-W. Damm, S. Pichowiak, C. Breitkreuz, R. S. Harmon, W. Todt, and M. Buchelt 13 The Deep Crust of an Early Paleozoic Arc; The Sierra de Fiambalâ, Northwestern Argentina 189 G. C. Grissom, S. M. DeBari, S. P. Page, R.F.N. Page, L. M. Villar, R. G. Coleman, and M. V. de Ramirez 14. Petrology of Quaternary Shoshonitic Lavas of Northwestern Argentina 201 B. Déruelle 15. Styles of Zoning in Central Andean Ignimbrites; Insights into Magma Chamber Processes 217 S. L. de Silva 16. The Source of Central Andean Magmas; Some Considerations 233 J. P. Davidson, R. S. Harmon, and G. Worner 17. Petrological and Tectonic Evolution of the Cenozoic Volcanism in the Bolivian Western Andes 245 W. Avila-Salinas 18. Tectonics and Magmatism in the Peruvian Andes from Late Oligocene Time to the Present 259 M. Sébrier and P. Soler 19. On the Isostatic State of the and the Central Andes; A Statistical Comparison 279 H.-J. Gôtze, B. Meurers, S. Schmidt, and P. Steinhauser 20. Palaeomagnetism of Jurassic and Cretaceous Rocks from South America and the Tectonics of the Central Andes 291 E. S. Oviedo, D. A. Valencio, and J. F. Vilas Index 301

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