The Berezitovoe gold-polymetallic deposit (East Siberia): mineralogy, age, and relation with magmatism
A.V. Mel'nikov a , A.A. Sorokin a ,*, V.A. Ponomarchuk b , A.V. Travin b , A.P. Sorokin a
a Institute of Geology and Nature Management, Far Eastern Branch of the RAS, 1 per. Relochnyi, Blagoveshchensk, 675000, Russia
b Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: gold-polymetallic mineralization; 40Ar/39Ar dating; PGE; Berezitovoe deposit; Amur region
Pages: 188-194
Abstract
The Berezitovoe gold-polymetallic deposit is localized in the west of the Selenga-Stanovoi superterrane composed of a wide spectrum of Early and Late Precambrian igneous rocks and abundant Paleozoic and Mesozoic intrusive and volcanoplutonic associations. The 40Ar/39Ar ages determined for metasomatites bearing gold-polymetallic mineralization are as follows: garnet-quartz-muscovite-sericite-K-feldspathic metasomatites (129.7±3.2-127.3±4.4 Ma); muscovite-quartz-sericite metasomatites (132.0±2.9-131.3±2.3 Ma). According to the age and general scheme of evolution of the Early Cretaceous magmatism in the Selenga-Stanovoi superterrane, the metasomatites of the Berezitovoe deposit are nearly coeval to the intrusive rocks of the Amudzhikan complex (132-128 Ma). The revealed platinum potential of gold-polymetallic ores and metasomatites permits ranking the Berezitovoe deposit as a specific complex gold-polymetallic-platinum deposit, which considerably increases its commercial value.
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