USGS Professional Paper 1697 - Alaska Resources Library

58 Metallogenesis and Tectonics of the Russian Far East, Alaska, and the Canadian Cordillera
from 0.2 as much as 4 m thick and as much as 1.5 km long.
The host polymictic sandstone contains pyroclasts of volcanic
rock. The deposit occurs in a stratigraphic interval from 50 as
much as 300 m thick that is underlain by Famennian basalt that
also contains copper mineralization. The deposit occurs within
a major syncline that has an amplitude of as much as 4 km. Ore
bodies and host rocks strike at 40 to 70° on syncline limbs.
Dzhalkan Basaltic Cu Deposit
The well-known basaltic Cu deposit at Dzhalkan
(Kutyrev, 1984; Kutyrev and others, 1988) occurs in a Famennian
amygdaloidal basalt flow and near the Kurpandzha sediment-hosted
Cu deposit. The deposit consists of disseminated
Cu in a sequence of basalt flows with a total thickness of 180
m. The deposit is mostly confined to horizons that range from
0.5 to 2.0 m thick and contain both cinders and amygdules
at the top of flows. The ore minerals include native copper
A
Map
A
Cross section
and cuprite, with lesser bornite, chalcocite, and chalcopyrite.
Epidosite (epidote-quartz) wallrock alteration occurs locally.
The ore bodies range from 0.3 to 1.0 m thick and as much as
100 m long. Areas of copper mineralization are separated by
unmineralized areas of as much as several kilometers. The
deposit is small with average grades of 0.3 as much as 4.5
percent Cu. The basalt flows erupted into shallow water and
subaerial environments. The host basalts are folded, with fold
limbs dipping 40 to 60°.
Origin of and Tectonic Controls for Sette-Daban Range
Metallogenic Belt
The Sette-Daban metallogenic belt occurs within the
Sette-Daban horst/anticlinorium in the southwestern part of
the North Asia Craton Margin (the Verkhoyansk fold belt, unit
NSV; Shpikerman, 1998). The local units that host the Sette-
Daban metallogenic belt consist of mainly thick, shelf carbon-
B
B
1 km
+400or
0
-400 above
-800
-1200Meters, River gravel and sand
(Quaternary)
Particoloured limestone
(Middle Cambrian)
Grey-green limestone with
glauconite and black
siliceous siltstone
(Lower Cambrian)
Dolostone, limestone,
stromatolithic biogerms,
carbonate breccia, more
rarely marl, sandstone,
argillite, tuff (Vendian)
Greenish-grey sandstone,
siltstone, varigated argillite
(Upper Riphean)
Zn-Pb ore body
Fault
Contact
Figure 26. Sardana Southeast Missouri Pb-Zn deposit, Sette-Daban metallogenic belt, Russian Northeast.
Schematic geologic map and cross section. Adapted from Shpikerman (1998) using materials of A.I.
Starnikov and A.V. Prokopiev. See figure 16 and table 4 for location.
0
below sea level