USGS Professional Paper 1697 - Alaska Resources Library

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200 Metallogenesis and Tectonics of the Russian Far East, <strong>Alaska</strong>, and the Canadian Cordillera Lastochka, and (8) a volcanic-hosted Hg deposit at Uralskoe. The porphyry Cu-Mo deposits occur in parts of the volcanicplutonic belt that are uplifted along major faults, as in the Okhoto-Kuhtui, Chelomdja-Yana, and Anadyr zones. Some of these zones occur along a regional gravity gradient between the front and rear zones of the volcanic-plutonic belt. In the northeastern part of the Koni-Yablon zone, the Primagadan area, the best known part of the Koni-Yablon zone, extends along the coast of the Sea of Okhotsk for about 500 km and contains the Osenee, Usinskoe,, Nakhatandjin- Lori, Ikrimum, and other deposits. These deposits occur in multiphase, large, Na-series Early Cretaceous gabbro, tonalite, granodiorite, and plagiogranite plutons that display low initial Sr ratios (
10 percent Cu, as much as 0.92 percent WO 3, and as much as 0.3 percent Mo. Eastern Asia-Arctic Metallogenic Belt: Korkodon-Nayakhan Zone of Porphyry Mo and Granitoid-Related Au Deposits (Belt EAKN), East-Central Part of Russian Northeast The Korkodon-Nayakhan zone of porphyry Mo and granitoid-related Au deposits (fig. 79; tables 3, 4) occurs in two parts in the east-central part of the Russian Northeast. Each part is about 200 km long. The zone contains a small porphyry Mo deposit at Orlinoe, a granitoid-related Au deposit at Khetagchan, a Fe skarn deposit at Skarn, a Au-Ag polymetallic vein deposit at Verkhny-Koargychan, and a Fe- Pb-Cu-Ag-Au skarn deposit at Sedoi (table 4) (Nokleberg and others 1997a,b, 1998). Both types of deposits are related to subalkalic felsic and intermediate composition intrusions of granite and granosyenite. The deposits generally occur either in the apical parts of the intrusive rocks or in the adjacent wall rocks. The granitoid-related Au deposits are characterized by Ag tellurides. The deposits are generally small. Most of the lode deposits in the zone consist of sulfides disseminations and stringers. The granitoid rocks hosting the Korkodon-Nayakhan zone form a belt that is transverse or orthogonal to the Okhotsk-Chukotka volcanic-plutonic belt. The relation of the origin of the granitoid rocks to the Okhotsk-Chukotka volcanic-plutonic belt is unclear. Orlinoe Porphyry Mo Deposit The Orlinoe porphyry Mo deposit (V.N. Okhotnikov, written commun., 1957) consists of a steeply dipping stockwork that extends for tens of meters. The stockwork consists of thin quartz veins and veinlets with disseminations and masses of molybdenite. Subordinate minerals are pyrite, chalcopyrite, wolframite, powellite, muscovite, fluorite, calcite, chlorite, and garnet. The deposit occurs in contact-metamorphosed, Late Triassic sedimentary rocks and in Late Cretaceous granite that intrudes the sedimentary rocks. The deposit is small and averages 0.01 to 0.03 percent Mo, but locally is as much as 8.5 percent Mo. Khetagchan Porphyry Granitoid-Related Au Deposit The Khetagchan porphyry granitoid-related Au deposit (V.A. Sidorov, written commun., 1990) consists of zones of sulfide-quartz and sulfide-chlorite-quartz veins and veinlets as much as 150 m long and 10 to 15 m thick. The veins and veinlets occur along the contacts of a Late Cretaceous granodiorite, both within and adjacent to the intrusion. The ore minerals are galena, sphalerite, chalcopyrite, wolframite, pyrite, arsenopyrite, bismuthinite, native bismuth, gold, electrum, tetrahedritetennantite, Ag-sulfosalts, and argentite. The deposit is judged as small and contains as much as 20 g/t Au and as much as 50 to 60 g/t Ag. Early Late Cretaceous Metallogenic Belts (100 to 84 Ma; figs. 79, 80) 201 Eastern Asia-Arctic Metallogenic Belt: Verkhne- Kolyma Zone of Sn-Ag Polymetallic Vein, Southern Bolivian type), Sn Polymetallic Vein, Rhyolite- Hosted Sn, and Granitoid-Related Au Deposits (Belt EAVK), Southeastern Part of Russian Northeast The Verkhne-Kolyma zone of Sn polymetallic vein (Southern Bolivian type), Sn-Ag polymetallic vein, rhyolite-hosted Sn deposits, and granitoid-related Au deposits (fig. 79; tables 3, 4) occurs in the southeast part of the Russian Northeast. The belt trends mainly northwest-southeast, extends for about 700 km and is as much as 100 km wide. The metallogenic belt is associated with Cretaceous plutonic rocks that intrude the North Asian Craton Margin (Verkhoyansk fold belt, unit NSV) and the Viliga passive continental-margin terrane (Nokleberg and others, 1994c, 1997c). These plutonic rocks form an orthogonal branch of the Okhotsk-Chukotka volcanic plutonic belt. Sn polymetallic vein (Southern Bolivian type) and Sn-Ag polymetallic vein deposits are hosted mainly in Late Cretaceous dacite and rhyolite subvolcanic dikes and stocks. The significant deposits in the zone are (table 4) (Nokleberg and others 1997a,b, 1998) (1) Sn silicate-sulfide and Sn polymetallic vein deposits at Baryllyelakh-Tsentralny, Bogatyr, Dneprov, Kandychan, Kharan, Khenikandja, Kheta, Khuren, Kuranakh-Sala, Kyurbelykh, Porozhistoe, Svetloe, and Tigrets-Industriya, (2) a Sn greisen deposit at Ossolony, (3) a rhyolite-hosted Sn deposit at Suvorov, (4) Au-Ag epithermal vein deposits at Aida and Zerkalnoe, (5) Pb-Zn-Ag vein or skarn deposits at Bulunga and Tektonicheskoe, (6) granitoid-related Au deposits at Netchen-Khaya, Shkolnoe, (7) a porphyry Mo deposit at Tankist, and (8) a Co-Bi-As vein deposit at Verkhne-Seimkan. The Co and Bi deposits, as at Verkhny Seimkan, are associated with Cretaceous granitoid plutons of the Okhotsk-Chukotka volcanic-plutonic belt. The deposits are generally small and exhausted, partly mined, or starting to be mined, as at Shkolnoe. Local Sn deposits with Ag, Pb, and Zn, may be of future economic interest. Tigrets-Industriya Sn Polymetallic Vein Deposit The small Tigrets-Industriya Sn polymetallic vein deposit (Lychagin, 1967; Plyashkevich, 1990) consists of quartz-carbonate-sulfide, quartz-sulfide, and sulfide-quartz veins and lenticular bodies and zones of veinlets that occur in weakly metamorphosed Late Permian sedimentary rocks intruded by a Late Cretaceous granite porphyry. The ore bodies occur along northeast-trending fractures, are 100 to 200 m long, and range from 0.1 to 0.8 m thick. Late Cretaceous siliceous lava flows occur peripheral to the mineralized area. Several Sn and Ag mineral assemblages occur in the deposit. A period of deformation separated early and late stages. The early assemblage consists of quartz-cassiterite and polysulfide containing cassiterite, arsenopyrite, pyrite, chalcopyrite, sphalerite, galena, canfieldite, Fe-freibergite, stannite, and pyrargyrite. The late seleno-canfieldite-quartz assemblage contains quartz, pyrite, sphalerite, galena, stannite, selenocanfieldite, and Mn-calcite.
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USGS Prepared in collaboration with
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U.S. Department of the Interior Gal
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iv Hart River SEDEX Zn-Cu-Ag Deposi
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vi Specific Events for Middle Throu
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viii Metallogenic Belts Formed Duri
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x Origin of and Tectonic Controls f
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xii Toodoggone Metallogenic Belt of
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xiv Slate Creek Serpentinite-Hosted
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xvi Left Omolon Belt of Porphyry Mo
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xviii Origin of and Tectonic Contro
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xx Chukotka Metallogenic Belt of Au
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xxii Plutonic Rocks Hosting East-Ce
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xxiv Skeena Metallogenic Belt of Po
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xxvi Bee Creek Porphyry Cu Deposit
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xxviii 36. Wellgreen gabbroic Ni-Cu
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xxx 87. Partizanskoe Pb-Zn skarn de
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Metallogenesis and Tectonics of the
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format (Nokleberg and others, 1996)
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logenesis of the region (1) subduct
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Subterrane—A fault-bounded unit w
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dilemma consists of two conflicting
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2 to 20 m thick. A related dolomite
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Lantarsky-Dzhugdzhur Metallogenic B
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Origin of and Tectonic Controls for
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Metallogenic Belts Formed During Pr
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as at Oz, Monster, and Tart, may al
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Monashee Metallogenic Belt of Sedim
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Clark Range Metallogenic Belt of Se
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in addition to the Fe deposits. Min
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study) consists of lenses, from 100
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Omulev Austrian Alps W Deposit The
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ock, including coarse clastic rock,
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lative metalliferous brines in a re
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Prince of Wales Island Metallogenic
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suite of deposits and host rocks ar
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margin of the North American Craton
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newly created terranes migrated int
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(Ryazantzeva and Shurko, 1992). The
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tonnes Au and an average grade of a
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mafic and felsic metavolcanic rocks
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intrusion from about 402 to 366 Ma
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mentary rocks of the Cambrian to De
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(Preto and Schiarizza, 1985; Schiar
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ate and clastic rocks and volcanicl
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(Nokleberg and others, 1994c, 1997c
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Berezovka River Metallogenic Belt o
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Finlayson Lake Metallogenic Belt of
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and barite in siliceous black turbi
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Windermere Creek (Western Gypsum) C
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(NX, DL, MY), Viliga (VL), and Zolo
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South of the main east-west-trendin
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ated subduction zone in the Wrangel
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icite-biotite-quartz bodies in frac
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Canada Cordillera. The granitoid ro
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Viliga (VL) passive continental-mar
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32; tables 3, 4) occurs along the n
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superterrane, consists mainly of ma
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ers, 1994c, 1997c). In southern Bri
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mental volcanic rocks of intermedia
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a resource of 34.3 million tonnes o
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potassic zone. Combined estimated p
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and quartz monzodiorite stock and s
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and Omolon (OM) cratonal terranes,
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in volcanic and volcaniclastic rock
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minor calcite, and sporadic pyrite
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supergene blanket are interpreted a
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deposits and occurrences consist of
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onto the Omulevka terrane to form t
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superterrane. This belt is interpre
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to form along the leading edge of t
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quartz, and is virtually not associ
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deposits are at Terrassnoe and Kuna
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Peschanka Porphyry Cu-Mo Deposit Th
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The belt is hosted in the Late Jura
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in a island arc that was tectonical
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and Early Cretaceous Koyukuk island
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The deposit consists of disseminate
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The Orange Hill deposit contains an
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49; tables 3, 4) (Foley and others,
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locally Late Triassic marine volcan
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gold in a gangue of quartz, calcite
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Verkhoyansk granite belt, which int
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metallogenic belts are interpreted
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assemblages, which may have been mo
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during hypogene and supergene alter
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collision and regional thrusting, t
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Yur Au Quartz Vein Deposit The smal
Page 181 and 182: phase has a Rb-Sr isotopic age of 1
Page 183 and 184: sian Northeast. The belt is hosted
Page 185 and 186: Host Granitoid Rocks and Associated
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Page 189 and 190: Metallogenic Belts Formed During La
Page 191 and 192: y partly coeval plutons that range
Page 193 and 194: tion is interpreted as occuring by
Page 195 and 196: the Badzhal-Ezop and Khingan parts
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Page 199 and 200: as interpreted for the Rock Creek d
Page 201 and 202: source (Yeo, 1992). The Blow River
Page 203 and 204: 2000). The spatial location of the
Page 205 and 206: to the east in the central Yukon Te
Page 207 and 208: occur in a 30-km-long belt along ir
Page 209 and 210: The Emerald deposit has produced ap
Page 211 and 212: Metallogenic-Tectonic Model for Ear
Page 213 and 214: cham oceans were closed, and the Ch
Page 215 and 216: greisenized Mesozoic granite that i
Page 217 and 218: composition magmatic bodies (with a
Page 219 and 220: Origin of and Tectonic Controls for
Page 221 and 222: to Albian pelecypods (Nokleberg and
Page 223 and 224: quartz-arsenopyrite-pyrrhotite, pol
Page 225 and 226: thermally altered to siliceous and
Page 227 and 228: These ore bodies are as much as 1 m
Page 229 and 230: Eastern Asia-Arctic Metallogenic Be
Page 231: Demin, and Krasilnikov, 1974; Nekra
Page 235 and 236: pyrite, pyrite, galena, sphalerite,
Page 237 and 238: content decreases with depth, as do
Page 239 and 240: azdelnoye, (2) porphyry Sn deposits
Page 241 and 242: Karalveem Au Quartz Vein Deposit Th
Page 243 and 244: Democrat (Mitchell Lode) Granitoid-
Page 245 and 246: with high-temperature and high-pres
Page 247 and 248: chalcocite and covellite and also h
Page 249 and 250: cum-North Pacific, (2) completion o
Page 251 and 252: (6) In the Paleocene (about 56 to 6
Page 253 and 254: sists of cinnabar and metacinnabari
Page 255 and 256: Eastern Asia-Arctic Metallogenic Be
Page 257 and 258: groups of deposits are interpreted
Page 259 and 260: Indian Mountain and Purcell Mountai
Page 261 and 262: and southeastern Alaska (Moll and P
Page 263 and 264: Nokleberg and others, 1995a; Bundtz
Page 265 and 266: g/t Au or 368.2 Au gold. The deposi
Page 267 and 268: wim Group and altered mafic dikes.
Page 269 and 270: Mount Nansen porphyry Cu-Mo deposit
Page 271 and 272: A Map 450 500 550 Cross section Dik
Page 273 and 274: Cretaceous and early Tertiary conti
Page 275 and 276: deposits, at Chichagoff and Hirst-C
Page 277 and 278: others, 1994c, 1997c). The signific
Page 279 and 280: tonnes grading 0.53 percent Ni, 0.3
Page 281 and 282: with a 0.25 percent cut-off. The de
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Bulkley Metallogenic Belt of Porphy
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Red Rose W-Au-Cu-Ag Polymetallic Ve
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ish Columbia and consists of severa
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during back-arc extension or transt
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stocks and dikes, is associated wit
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etrograde minnesotaite (Fe talc), F
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Specific Events for Early to Middle
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of fractured and faulted Permian-Tr
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sists of a mineralized fracture zon
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dolomite. Wall rock alteration incl
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elt of late Tertiary plutons that a
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plates that exhibit magnetic anomal
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stages (Petrenko, 1999): (1) In the
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mon. The deposit is of medium size
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Metallogenic-Tectonic Model for Lat
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The origin of the Hg deposits of th
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margin or island-arc tectonic envir
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Columbia: Implicatons for the Middl
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Bazard, D.R., Butler, R.F., Gehrels
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Bradley, D.C., Haeussler, P.J., and
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Bundtzen, T.K., Laird, G.M., Caluti
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Cecile, M.P., 1982, The lower Paleo
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Debari, S.M., and Coleman, R.G., 19
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U.S. Bureau of Land Management Open
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Cordilleran Orogen in Canada: Geolo
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Goldfarb, R., Hart, C., Miller, M.,
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Grove, E.W., 1986, Geology and mine
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Høy, T., 1982a, Stratigraphic and
Page 339 and 340:
Jones, D.L., Silberling, N.J., Cone
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Kutyev, F. Sh., Baikov, A.I., Sidor
Page 343 and 344:
Shield—Ultramafic magma and its m
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Manns, F.T., 1981, Stratigraphic as
Page 347 and 348:
Miller, M.L., and Bundtzen, T.K., 1
Page 349 and 350:
Mortimer, N., 1987, The Nicola Grou
Page 351 and 352:
Noble, S.R., Spooner, E.T.C., and H
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Canada Annual Meeting, Saskatoon, S
Page 355 and 356:
Perello, J.A., Fleming, J.A., O’K
Page 357 and 358:
Far East—Mineralogical criteria f
Page 359 and 360:
Roeske, S.M., Mattinson, J.M., and
Page 361 and 362:
Schmidt, J.M., and Zierenberg, R.A.
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formation occurrences: Materialy po
Page 365 and 366:
Struik, L.C., 1986, Imbricated terr
Page 367 and 368:
Valuy, G., and Rostovsky, F., 1988,
Page 369 and 370:
Wolfe, W.J., 1995, Exploration and
Page 371 and 372:
Appendix Table 1. Mineral deposit m
Page 373 and 374:
Table 2 Summary of correlations and
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Table 2—Continued Unit(s) and Cor
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Table 2—Continued Unit(s) and Cor
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Table 3—Continued Metallogenic Be
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Table 4. Significant lode deposits,
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Table 4—Continued Appendix 369 De
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Table 4—Continued Tracy Metalloge
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Table 4—Continued Appendix 373 In
Page 407 and 408:
Table 4—Continued Deposit Name Mi
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Table 4—Continued Mainits Metallo
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Table 4—Continued Whitehorse Meta
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Table 4—Continued Appendix 389 LA
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Table 4—Continued Surprise Lake M
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Table 4—Continued Sredinny Metall
Page 429:
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