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

Unconsolidated Quaternary
sediment
Diabasic sill (Late Paleozoic)
Siltstone, argillaceous and
cherl sh& (Late Devonian
and Arty Carboniferous)
Limestone (Late Devonian)
Dolomite, dolomitic vrl, 8
dolomrte breccla (Middle
Devonian)
Limestone (Early Devonian)
Diagenetic dolomite (Early
Devonian)
Dolomitic marl Late Silurian and
Eariy Devonian\
\ Thrust fault
/ Contact
\
Fault. displacement unknown
High grade fluorite-lead-zinc ore
Strike and dip of bedding
Figure 27. Urultun Southeast Missouri Pb-Zn deposit, Urultun and Sudar Rivers metallogenic belt, Russian Northeast. Generalized
geologic map of the Bitum-Sdvig area of stratabound F-Pb-Zn deposit. Adapted from Shpikerman (1987).
Origin of and Tectonic Controls for
Urultun and Sudar Rivers Metallogenic Belts
Both the Southeast Missouri Pb-Zn and carbonate-hosted Hg deposits are interpreted as forming in a middle Paleozoic
thermal artesian paleobasin in a major petroleum area (Shpikerman, 1998). Early and middle Carboniferous rifting is interpreted as
the source of mineralizing fluids. Similarly, the deep-marine sedimentary and mafic volcanic rocks which host the basaltic Cu,
volcanogenic Mn, and associated deposits of the Urultun and Sudar Rivers metallogenic belt are interpreted either as
allochthonous blocks of oceanic-floor sedimentary rocks, or as sedimentary and volcanic rocks which were deposited during
Devonian rifting of the North Asian Craton Margin to form the Omulevka terrane (Nokleberg and others, 1994c, 1997~).
Characteristic pyroclastic debris in the sedimentary rocks indicates which submarine volcanism and was associated with these
SEDEX deposits. This interpretation is supported by anomalous values of Pb, Zn, Cu, Ag, and Hg in the host rocks. In spite of the
variety of mineral deposit types in this belt, a genetic relation is interpreted between most of the deposits. The sedimentary-
exhalative accumulation of M n and barite ores, and anomalous Pb, Zn, Cu, Ag, and Hg concentrations are interpreted as forming
during deposition of the Southeast Missouri Pb-Zn deposits in artesian horizons. The younger parts of the Omulevka terrane
consists of Carboniferous and Permian fossiliferous tuff, chert, shale, limestone, siltstone, and sandstone, and Triassic fossiliferous
siltstone, mudstone, marl, and shaley limestone.
Yarkhodon Metallogenic Belt of
Southeast Missouri Pb-Zn Deposits (Belt YR)
West-Central Part of Russian Northeast
The Yarkhodon metallogenic belt of Southeast Missouri Pb-Zn-barite deposits occurs mainly in the Yarkhodon River
basin in the west-central part of the Russian Northeast (fig. 16; tables 3,4) (Nokleberg and others, 1997b, 1998). The belt is