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Some geological-morphological features of the formation of gold-bearing placers in the Amur region
Authors:L V Eirish
Institution:(1) Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences, Moscow, Russia
Abstract:The intensity of placer formation is controlled by many factors, mainly by the erosion level of orebearing structures. Their deep erosion and long-term denudation resulted in the formation of numerous, often large placers with fine gold, which lost their relation with bedrocks and were derived mainly by rewashing of loose deposits from the depressions adjacent to the ore-bearing orogens. These placers are developed in many gold-bearing areas: Dambuki, Sutara, Erik, and others. Rich placers with coarse gold of high fineness were formed via erosion of gold mineralization that was previously metamorphosed by post-ore granitoids (Niman and Kerbi regions, Central Sikhote Alin).
Keywords:gold placer  bedrock sources  erosion level  placer formation  Amur region
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