TRACE ELEMENTS IN SULFIDES AND GOLD OF THE OLIMPIADA DEPOSIT (Yenisei Ridge): ORE SUBSTANCE SOURCES AND FLUID PARAMETERS
S.A. Silyanov1, A.M. Sazonov1, P.A. Tishin2, B.M. Lobastov1, N.A. Nekrasova1, E.A. Zvyagina1, M.A. Ryabukha3
1Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russia
2Tomsk State University, pr. Lenina 36, Tomsk, 634050, Russia
3V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Gold, sulfides, REE, trace elements, precious metals, ore substance sources, genesis, ICP MS, Yenisei Ridge, Olimpiada deposit
Abstract
We consider the distribution of trace elements and precious metals in sulfides and native gold of the Olimpiada deposit. Analysis of the obtained data provided conclusions about the source of ore substance and the parameters of the ore-forming fluid. We think that the deposit was formed by a medium- to high-temperature fluid with variable salinity and acidity/alkalinity, with chloride complexes dominating. The redox potential changed in the course of ore formation, but the ore mineralization formed under reducing conditions. The early Au-As mineralization might have formed with the major participation of crustal substance, but the supply of substance from another, probably deep-seated, source was also possible. The Au-Sb paragenesis differs significantly in REE and precious metals (primarily PGE) distribution, which might indicate a different source of substance (with a higher portion of a deep-seated component) during the formation of such parageneses. The Au/Ag ratios in sulfides, gold, and ores of the Olimpiada deposit point to the presence of Au and Ag sulfide minerals.
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