Rhaetian diamond placers in Siberia |
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Authors: | SA Grakhanov YuA Malanin VI Pavlov VP Afanas’ev NP Pokhilenko AV Gerasimchuk AN Lipashova |
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Institution: | 1. Nizhnelenskoe Joint-Stock Company, Yakutsk;2. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia;3. ALROSA Enterprise, 6 ul. Lenina, Mirnyi, 678170, Russia |
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Abstract: | Large diamond placers have been discovered in a Rhaetian basal horizon (Upper Triassic) in the north of the Sakha Republic (Yakutia) in the drainage areas of the Eekit, Nikabyt, Kelimyar, and Bur Rivers. In typomorphic features the found diamonds and indicator minerals of kimberlites are completely similar to those from Carnian basal horizons but, in contrast to them, are well sorted, and pyropes show features of mechanical wear. Analysis of the geologic evolution of the study area, morphology of diamonds and indicator minerals, and composition of the latter showed that the Rhaetian productive sediments resulted from the erosion of Carnian placers. |
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