USGS Professional Paper 1697 - Alaska Resources Library

118 Metallogenesis and Tectonics of the Russian Far East, Alaska, and the Canadian Cordillera
extends for 400 km; the central part is as much as 160 km
wide. The numerous porphyry Cu-Mo-Au deposits and Au-Ag
epithermal deposits in the belt are hosted in the Oloy volcanic
belt that forms the northeastern part of the Indigirka-Oloy
sedimentary and igneous assemblage (table 4) (Nokleberg and
others, 1994c, 1997c). The significant porphyry Cu deposits
are at Asket, Dalny, Innakh, and Peschanka (table 4) (Nokleberg
and others 1997a,b, 1998). The significant Au-Ag epithermal
deposits are at Vesennee and Klen. Associated Cu-Mo
stockwork deposits occur mainly in stocks and small bodies of
the gabbro-monzonite-syenite series (Gorodinsky and others,
1978). In some areas, a zonation of felsic-magmatism-related
deposits occurs in the Oloy metallogenic belt. Au-Ag epithermal
veins generally occur peripheral to granitic intrusions
that host porphyry Cu-Mo deposits, whereas Au quartz-carbonate-sulfide
polymetallic vein deposits occur in intermediate
sites between the Au-Ag epithermal vein and porphyry
Mo deposits.
Figure 52. Kunarev Pb-Zn-Cu-Ag skarn deposit, Yasachnaya River metallogenic belt, Russian Northeast. A.
Schematic geologic map and cross section. Adapted from Shpikerman (1998). See figure 48 and table 4 for
location. B. Explanation. See figure 48 and table 4 for location.