Abstract
This work presents the geological structure and a description of gold-ore manifestations and gold placers in the Un’ya–Bom ore-placer cluster of the Amur gold-bearing province. The host rocks are Late Paleozoic and Mesozoic black-shale formations. Intrusive formations are rare. The sublatitudinal Un’ya thrust fault, along which Paleozoic sandstones overlap Mesozoic flyschoid deposits, is regarded as an orecontrolling structure. Gold–quartz and low-sulfide ores are confined to quartz-vein zones. Ore minerals are arsenopyrite, scheelite, ferberite, galena, and native gold. Gold-ore manifestations and placers contain high-Hg native gold. The high Hg content in native gold is explained by the occurrence of the eroded frontal part of the gold-ore pipe in the ore cluster, a source of native gold.
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References
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Original Russian Text © V.A. Stepanov, V.G. Moyseenko, A.V. Melnikov, 2017, published in Doklady Akademii Nauk, 2017, Vol. 472, No. 6, pp. 681–685.
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Stepanov, V.A., Moyseenko, V.G. & Melnikov, A.V. A unique ore-placer cluster with high-Hg gold mineralization in the Amur region (Russia). Dokl. Earth Sc. 472, 173–177 (2017). https://doi.org/10.1134/S1028334X17020210
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DOI: https://doi.org/10.1134/S1028334X17020210