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

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 which host the Sette-Daban
metallogenic belt consist of mainly thick, shelf carbonate and clastic rocks, and volcaniclastic deposits of Riphean, Vendian, and
Cambrian age with a combined thickness of up to 13 krn. The major lithologies are limestone, dolomite, marl, mudstone, shale,
mudstone, siltstone, sandstone, quartzite, conglomerate, basalt, tuR, Cu-bearing sandstone, and Cu-bearing basalt. Rare mafic and
ultramafic dikes occur. The units are metamorphosed to lower greenschist facies. The sulfide deposits, as at Sardana, are
interpreted as syngenetic.
The Southeast Missouri Pb-Zn deposits are located in the upper part of the Oron Formation of Ludlovian age (350-500 m
thick) which consists of large black and thin bedded dolomites and hydrogenic dolomite breccia. Hiod unit is overlapped by the
Hurat Formation which consists mainly of marl. The Southeast Missouri Pb-Zn deposits of the Sette-Daban Range metallogenic
belt are interpreted as forming from artesian thermal waters which circulated through the carbonate rocks of the North Asia
passive continental margin. The sediment-hosted Cu deposits of the Sette-Daban belt are hosted in volcanic sedimentary rocks of
Givetian, Fronian, Famenian and Turonian age. The significant deposits are in the upper Famenian and Turonian Menkule suite
which ranges from 100 to 550 m thick and contains coastal-marine and continental sandstone, tuffaceous sandstone, siltstone, and
dolomite. The basaltic Cu and sediment-hosted Cu deposits are interpreted as forming during rifting, mainly in the Middle
Devonian to Early Carboniferous (Shpikerman, 1998).
Selennyakh River Metallogenic Belt of
Southeast Missouri Pb-Zn, Stratabound Hg and Au,
and Pb-Zn Vein Deposits (Belt SEL)
Northwestern Part of Russian Northeast
The Selennyakh River belt metallogenic belt of diverse lode deposits, including Mississippi Zn-Pb, stratabound Hg and
Au, and Pb-Zn vein deposits (fig. 16; tables 3.4) occurs in the northwestern part of the Russian Northeast (Shpikerman, 1998).
The metallogenic belt is hosted in the Ornulevka terrane of the Kolyma-Omolon superterrane in early through late Paleozoic,
passive continental margin carbonate and shale (Nokleberg and others, 1994c, 1997c; Shpikerman, 1998). The significant deposits
are (table 4) (Nokleberg and others 1997a, b, 1998): (I) stratabound Hg deposits such the Gal-Khaya carbonate-hosted Hg
deposit; (2) small Southeast Missouri type Pb-Zn occurrences as at Kondakovskoe; (3) Pb-Zn vein deposits as at Chistoe; and (4)
Au quartz vein deposits as at Khatynnakh-Sala. This metallogenic belt, which needs further study, occurs along a sublatitudinal
strike for more than 600 km (fig. 16).
Gal-Khaya Carbonate-Hosted Hg Deposit
The Gal-Khaya carbonate-hosted Hg deposit (Babkin, 1975) consists of a zone of quartz-carbonate breccia and veins
which occurs along the contact of Early Silurian limestone and calcareous shale. The zone is 600 m long, 60 to 80 m wide, dips
75", and is concordant to host rock bedding. The ore occurs in cylindrical ore shoots, mainly in carbonate breccia cemented with
calcite and quartz-calcite. The main ore mineral is cinnabar. Also present are metacinnabar, galkhaite (Hg, Cu, Zn; As, Sb),
stibnite, realgar, orpiment, pyrite, chalcopyrite, fluorite, barite, native gold, tennantite, sphalerite, bomite, chalcocite, covellite,
malachite, and azurite. Gangue minerals include quartz, calcite, dolomite, barite, dickite, kaolinite, and bitumen (anthraxolite). The
(syngenetic) deposit is interpreted as forming in the Late Devonian or Carboniferous (Shpikerman, 1998). or as an epigenetic
deposit which formed in the Late Cretaceous (Galkin. 1968).
Kondakovskoe Southeast Missouri Pb-Zn Occurrence
The Kondakovskoe Southeast Missouri Pb-Zn deposit (Bakharev and others, 1988) consists of sulfide disseminations and
pockets in Devonian limestone which is locally metamorphosed to marble. The deposit is localized along the southern contact of
the Early Cretaceous Ulakhan-Siss granodiorite intrusion. The mineralized layer is several hundred meters long and consists of
two mineral assemblages: (1) galena-sphalerite; and (2) less common pyrite-tetrahedrite. The deposit contains up to 0.1% Cd,
0.05-1% Pb, 0.08-1.5% Zn, and 0.01-0.3% Sb.
Chistoe Pb-Zn Vein Deposit
The Chistoe Pb-Zn vein deposit (Shpikerman, 1998) consists of a galena vein which occurs in a shear zone in Ordovician
Limestone locally metamorphosed to marble. The vein varies from 10 to 20 m thick and is about ten meters long. The ore minerals
include galena, which is predominant, and also pyrite, sphalerite, chalcopyrite, cerussite, and smithsonite. Oxidized minerals are
locally abundant.