Native gold in Cu- and Ni-bearing pyroxenite-cortlandite intrusions and placers of the Dambuki ore cluster,the Amur region |
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| Authors: | V A Stepanov L I Rogulina A V Melnikov D V Yusupov |
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| Institution: | (1) Geotechnical Research Center, Far East Division, Russian Academy of Sciences, Severo-Vostochnoe sh. 30, Petropavlovsk-Kamchatskii, 683002, Russia;(2) Institute of Geology and Nature Management, Far East Division, Russian Academy of Sciences, Relochnyi per. 1, Blagoveshchensk, 675000, Russia |
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| Abstract: | The Dambuki ore cluster of the Upper Amur region is characterized by numerous and high-grade gold placers. A few small primary deposits and occurrences of gold-quartz type were formerly considered to be the main source of placers. However, the study of widespread Early Cretaceous Cu- and Ni-bearing ultramafic intrusions has shown that gold occurring in primary Cu-Ni ores and products of their weathering practically does not differ from placer gold in morphology, fineness, or geochemical features. In both cases, elements typical of Cu-Ni ore (Cu, Fe, Pd, Ni, etc.) are detected as impurities of gold particles. These data indicate that the Au-and Pt-bearing Cu-Ni ore mineralization may be the main source of placer gold. This ore mineralization is genetically related to small pyroxenite-cortlandite sills and dikes, abundant in the Dambuki ore cluster. The primary gold-quartz deposits and occurrences also contributed to the placers, but their part was rather small. |
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