Silver-gold ore field, occurring in the central part of the Balygychan-Sugoi trough, a graben-shaped depression near the town of Omsukchan, Kolyma, adjoining to the north the Okhotsk–Chukotka marginal continental volcanic belt. The ore field extends around a Cretaceous age (ca. 120 Ma old) volcanic-intrusive dome that comprises ultrapotassic rhyolites, ignimbrites, and tuffs with interlayered black argillites. This volcanic complex is intruded at depth by a Late Cretaceous (ca. 82 Ma old) granite, whose roof is located 1200-1300m below the surface. The pulses of igneous activity in the ore field were accompanied by hydrothermal activity, which involved large volumes of fractured, porous, and highly permeable Early and Late Cretaceous rhyolite sills and steeply dipping subvolcanic bodies within an area of 25 km2.
The main part of the known mineralization is related to the younger intrusion. It includes Sn-bearing greisen and pegmatite occurring in the contact zones of granitic plutons, as well as tin–base metal and silver–base metal deposits, among them the Ducat (Dukat) Au–Ag deposit, which are located at a distance from the granites.
References
- Filimonova, L.G., and Chugaev, A.V. (2006): Chronology of Hydrothermal and Magmatic Activity in the Dukat Gold–Silver Ore Field. Geology of Ore Deposits 48(6), 489-498.
- Filimonova, L.G., and Trubkin, N.V. (2008): Micro- and Nanoparticles of Zincite and Native Zinc from Disseminated Mineralization of Metasomatic Rocks in the Dukat Ore Field. Geology of Ore Deposits 50(2), 135-144.
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