USGS Professional Paper 1697 - Alaska Resources Library

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238 Metallogenesis and Tectonics of the Russian Far East, Alaska, and the Canadian Cordillera ene-sphalerite-rich skarn distal to the dike swarm. Garnetrich skarn grades 0.5 to 1 percent Cu and 1 to 2 oz/t Ag, and negligible Zn and Pb. Pyroxene-rich skarn generally contains 5-20 percent Zn, 0.1-3 percent Pb, 0.5-2 percent Cu, and 2 to 9 oz/t Ag. In a single outcrop, skarn pyroxene becomes more Fe-rich, and sulfides increase towards marble. Sulfide veins occur locally in dikes and wall rocks. Many dikes are lacking associated skarn, and many dikes possess skarn only along one contact.The deposit has a resource of an estimated 230,000 tonnes with 16 percent combined Pb and Zn. Map Cross section A A i B g i g i g i i g i g g i i i i 0 300 m B 0 100 m Kijik River Porphyry Cu Deposit The Kijik River porphyry Cu deposit consists of a large area of low-grade, disseminated chalcopyrite, pyrite, and minor molybdenite that occur in and adjacent to an early Tertiary dacite porphyry (Eakins and others, 1978; Nelson and others, 1985; T.K. Bundtzen, written commun., 1984). The deposit contains a distinctive orange gossan that extends over a 3 km 2 area. The gossan contains an extensive stockwork and zones of sericite and silicic alteration and sulfides. g g g i i i i Conglomerate (Tertiary) Skarn Hornblende hornfels Porphyritic quartz monzodiorite Quartz monzodiorite to quartz monzonite Marble Northern metabasalt Southern metabasalt Fault Contact Endoskarn Metabasalt (altered to endoskarn) Massive garnet Garnet-pyroxene skarn Idocrase-wollastonite skarn Garnet-pyroxenewollastonite-skarn Cu sulfides Magnetite Quartz diorite (Cretaceous) Marble (Triassic) Cretaceous Triassic Figure 113. Zackly Cu-Au skarn deposit, southern Alaska metallogenic belt, southern Alaska. Schematic geologic map and cross section. Adapted from Nokleberg and others (1986) and Newberry and others (1997). See figure 103 and table 4 for location.
A Map 450 500 550 Cross section Dike Dike Snow field A B 550 500 0 250 m Possible roof greisen B South greisen zone North greisen zone Dike 450 500 0 300 m Granite Hornfels Talus and rock glacier (Quaternary), mainly muscovite granite fragments Greisen zones composed of 50 percent tabular greisen bodies and 50 percent granite wallrock Zinnwaldite granite Biotite-muscovite granite Early Tertiary Muscovite quartz porphyry dike Kuskokwim Group flysch Late Cretaceous), contact metamorphosed Contact Quartz vein associated with greisen alteration halo Quartz-tourmaline-topazcassiterite-wolframite veining Contour in meters Kuskokwim Group Figure 114. Sleitat Sn greisen and skarn deposit, Kuskokwim Mountains metallogenic belt, southwestern Alaska. Schematic geologic map and cross section. Adapted from Burleigh (1991) and Hudson and Reed (1997). See figure 103 and table 4 for location. Garnet Rich Skarn Pyroxene 48 Rich 71 Skarn 45 50 54 71 64 78 75 76 Late Cretaceous and Early Tertiary Metallogenic Belts (84 to 52 Ma) (figs. 102, 103) 239 56 77 81 35 27 67 72 65 65 Skarn Dacite to andesite porphyry dike (Tertiary) Marble, calc-hornfels, and skarnoid (Paleozoic) Vein Contact between skarn zones Strike and dip of bedding Contact 0 60 m Thrust fault Figure 115. Tin Creek Cu-Pb-Zn skarn deposit, southern Alaska metallogenic belt, southern Alaska. Schematic geologic map showing distribution of Zn-Pb skarn along dikes, bedding planes, and faults. Modified from Szumigala (1987) and Newberry and others (1997). See figure 103 and table 4 for location.
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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
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phase has a Rb-Sr isotopic age of 1
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sian Northeast. The belt is hosted
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Host Granitoid Rocks and Associated
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that are up to 600-1,500 m long, av
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Metallogenic Belts Formed During La
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y partly coeval plutons that range
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tion is interpreted as occuring by
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the Badzhal-Ezop and Khingan parts
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and comagmatic with volcanic rocks;
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as interpreted for the Rock Creek d
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source (Yeo, 1992). The Blow River
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2000). The spatial location of the
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to the east in the central Yukon Te
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occur in a 30-km-long belt along ir
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The Emerald deposit has produced ap
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Metallogenic-Tectonic Model for Ear
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cham oceans were closed, and the Ch
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greisenized Mesozoic granite that i
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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 and 232: Demin, and Krasilnikov, 1974; Nekra
Page 233 and 234: 10 percent Cu, as much as 0.92 perc
Page 235 and 236: pyrite, pyrite, galena, sphalerite,
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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
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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: Mount Nansen porphyry Cu-Mo deposit
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
Page 283 and 284: Bulkley Metallogenic Belt of Porphy
Page 285 and 286: Red Rose W-Au-Cu-Ag Polymetallic Ve
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Page 289 and 290: during back-arc extension or transt
Page 291 and 292: stocks and dikes, is associated wit
Page 293 and 294: etrograde minnesotaite (Fe talc), F
Page 295 and 296: Specific Events for Early to Middle
Page 297 and 298: of fractured and faulted Permian-Tr
Page 299 and 300: sists of a mineralized fracture zon
Page 301 and 302: dolomite. Wall rock alteration incl
Page 303 and 304: elt of late Tertiary plutons that a
Page 305 and 306: plates that exhibit magnetic anomal
Page 307 and 308: stages (Petrenko, 1999): (1) In the
Page 309 and 310: mon. The deposit is of medium size
Page 311 and 312: Metallogenic-Tectonic Model for Lat
Page 313 and 314: The origin of the Hg deposits of th
Page 315 and 316: margin or island-arc tectonic envir
Page 317 and 318: Columbia: Implicatons for the Middl
Page 319 and 320: 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
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Jones, D.L., Silberling, N.J., Cone
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Kutyev, F. Sh., Baikov, A.I., Sidor
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Shield—Ultramafic magma and its m
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Manns, F.T., 1981, Stratigraphic as
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Miller, M.L., and Bundtzen, T.K., 1
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Mortimer, N., 1987, The Nicola Grou
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Noble, S.R., Spooner, E.T.C., and H
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Canada Annual Meeting, Saskatoon, S
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Perello, J.A., Fleming, J.A., O’K
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Far East—Mineralogical criteria f
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Roeske, S.M., Mattinson, J.M., and
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Schmidt, J.M., and Zierenberg, R.A.
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formation occurrences: Materialy po
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Struik, L.C., 1986, Imbricated terr
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Valuy, G., and Rostovsky, F., 1988,
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Wolfe, W.J., 1995, Exploration and
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Appendix Table 1. Mineral deposit m
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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
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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
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