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

I 1997a, b, 1998). The massive sulfide ores generally occur conformable to organic-rich, bituminous limestones near a contact with
overlying marl. Banded magnetite ore associated with algae bioherms is a peculiarity of the stratiform deposits of the Vomesenka
metallogenic belt.
Voznesenka-1 Korean Pb-Zn Deposit
The Voznesenka-I (Korean Pb-Zn deposit (fig. 8) (Androsov and Ratkin, 1990; Ryazantseva, 1988) consists of massive
and thick-banded sphalerite and magnetite-sphalerib layers in bedded Early Cambrian limestone turbidite. The ore bodies are
lenticular, 1-2 m thick, 20 to 100 m long, and occur in dolomitic limesione and marl. The sulfide bodies and host rocks are folded
and regionally metamorphosed. The sulfide bodies were locally altered to skarn and greim during emplacement of a Silurian
panitic stock which intrudes the carbonate unil. The deposit is of medium size with an average grade of 4% Zn.
Basalt and andesite dikes
and early
Granite porphyry (Late
Pal-)
Dorite (Middle P-oic)
Li-F granite (Early Pabomic)
1
Slate and siltstone
El Skb, -,
chert 1 E*
Cambriar
dolomitic listone
Dolostone and
Cambrian massbe svMde on
Figure 8. Voznesenka-1 Korean Zn massive sulfkle deposit (Vomesenka metallogenic belt) and Voznesenkall Rrr~te greiwn
deposit, Yaroslavka metallogenic belt, Russian Southeast. Schematic geologic map. Adapted from Ratkin (1995).
Chemyshevskoe Korean Pb-Zn Deposlt
The nearby Chernyshevskoe Korean Pb-Zn &posit (Bhanov, 1988; Ryazantseva. 1988) consists of sheeted pynhotite-
arsenopyrite-pyrite-galena-sphalerite bodies which occur at the contact of a limestone sequence with overlying Early Cambrian
siltstone. Rare conformable zones of disseminated sulfide mhcrahation occur within he limestone away from the contact. The
sulfide bodies are 1 to 2 m thick, with a surface exposure 100 to 200 m long. The deposit was drilled to a depth of abut 100 m.
The deposit is small with an average grade of 1.545% Pb and 0.7-2.5% Zn. Both the Voznesenka-1 and Chemyshevskoe deposits
were formerly interpreted as s km and were previously not evaluakd properly. Locally abundant sedimentary-exhalalive
siliceous rocks have anomalously high F. B, and Zn values.