Metallogenesis and Tectonics of the Russian Far East, Alaska, and ...

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quartz, dickife, dolomite, siderite, calcite, cinnabar, marcasite, pyrite, galena, sphalerite, native arsenic, and realgar, and nickel
minerals. WaIl-rock alteration is not identified. The deposit contains an estimated 10,117 tonnes Hg in ore grading 0.53% Hg.
Unconsolidated
(Qua ternary)
Granite porphyry
(Late Cretawws)
Cross section
N
Felslc volcanic rocks
(Late Cretaceous)
/ Ore body
Strike and dip of
bedding
Figure 106. Maiskoe disseminated Au-sulfide deposit, Anuyi-Beringovsky zone, Eastern Asia-Arctic metalbgenic hell, Russian
Northeast. Schematic geologic map and cross section. Adapted from Sidorov and Eremin (1995).
Sewad Penbrsula Metabgemlc Belt of
Gmitic Magmatidm beposltc (Belt SP)
Northweeterm Alaska
The Seward Peninsula metallogenic belt of granitic magmatism deposits (fig. 103; tables 3,4) occurs on the wakrn pM
ofthe Seward Peninsula and St. Lawrence Island (not shown on fig. 103) in northern Alaska (Nokleberg and oihers. 1995a;
Hudson md Reed, 1997). The metallogenic belt is hosted in the part of the region intruded by L& Cretaceous sibcic granitoid
plutom (Hudson and Arth, 1983). The deposit types are mainly Sn granite, porphyry Mo, polymdallic vein, and felsic plutonic U
deposils. The significant deposits in the belt are (table 4) (Nokleberg and others 1997a, b, 1998): Sn quartz veio deposits at Cape
Mountain aiad Potaloe Mountain; a Sn skarn deposit at Ear Mountain (Winfield); a complex Sn-W skarn, Sn grelsen, Carbonatereplacemmt
Sn(7) deposit at Lost River; a Sn greisen deposit at Kougarok; polymetallic vein deposits at Independence, Omilalc,
Quartz Creek, and Serpentine Hot Springs; a porphyry Mo deposit at Windy Creek; a sediment-hosted U deposit at De& Valley;
and a felsic plutonic U deposit at Eagle Creek. The deposits and host granite plutons are interprated as the extreme northeastern
end of the Cretaceous and early Tertiary Okhotsk-Chukotka volcanic-plutonic belt which extends for several thousand Icllometers
to the west across the Bering Straits and southwest into the Russian Far East (Nokleberg and olhets, 1994c, 1993~). The variouo
Sn depoaits are commonly referred to as the Cretaceous tin province of the Seward Peninsula. The origms of many of Be
polymetallie vein deposib are somewhat enigmatic.