ORE MINERALIZATION OF THE ALIYA ORE FIELD (Transbaikalian sector of the Mongol-Okhotsk Orogenic Belt): STRUCTURAL RELATIONSHIPS, MINERALOGY, GEOCHEMISTRY, AND ZONING
N.A. Goryachev1,2, G.A. Yurgenson3, T.S. Nikanyuk1,4
1A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia
2N.A. Shilo Northeast Interdisciplinary Scientific Research Institute, Far Eastern Branch of the Russian Academy of Sciences, Magadan, Russia
3Institute of Natural Resources, Ecology and Cryology, Siberian Branch of the Russian Academy of Sciences, Chita, Russia
4Irkutsk Research Institute of Rare and Precious Metals and Diamonds, Irkutsk, Russia
Keywords: Gold deposits, mineralogical-geochemical and mineralogical-technological characteristics of ores, zoning, ore-magmatic system, Aliya ore cluster, Transbaikalia, Mongol-Okhotsk Orogenic Belt
Abstract
The paper presents new data on the structural position, mineralogy, and geochemistry of ores of the Aliya ore cluster and their technological specifics. The mineralogical and geochemical zoning of the Verkhne-Aliinskoe gold deposit and the entire Aliya ore cluster is considered. We show the subordination of the local and horizontal zoning of mineralization within the ore cluster and the localization of granitoids of the late phase of the Late Jurassic Akatui Complex. A conclusion is drawn about the relationship of mineralization with granitoids within a single ore-magmatic system that existed under unstable shallow-depth P - T - X conditions transitional to subsurface ones. This specifics distinguishes the Verkhne-Aliinskoe deposit from the compositionally similar Sredne-Golgotaiskoe and Sosnovskoe deposits and partly determined the technological resistance of its ores.
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