Genesis and crystallization of ultramafic alkaline carbonatite magmas of Siberia: ore potential,mantle sources,and relationship with plume activity |
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| Affiliation: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;3. Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh’yanovoi 6a, Ulan-Ude, 670047, Russia;4. Buryat State University, ul. Smolina 24a, Ulan-Ude, 670000, Russia;5. Topaz Geological Exploration Company Ltd., ul. Geologicheskaya 1, Ust’-Kamenogorsk, 070001, Kazakhstan;1. V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Koptyuga ave. 3, Novosibirsk 630090, Russia;2. Institute of Petrology and Structural Geology, Charles University, Prague 12843, Czech Republic;3. Laboratories of the Geological Institutes, Charles University, Prague 12843, Czech Republic;4. Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Prague 12843, Czech Republic;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia |
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| Abstract: | ![]()
This paper discusses the genesis of large Siberian alkaline massifs hosting major ore deposits. These reference massifs are grouped based on the predominance of alkalies (K or Na) and their agpaitic index (miaskitic and agpaitic). We proposed new emplacement schemes for the Tomtor, Murun, Burpala, Synnyr, and Bilibino massifs supported by petrochemical and geochemical data, as well as new age estimates. Types of their ore potential and genesis of rare-metal mineralization are discussed. The formational types of carbonatites as the main ore-bearing rocks are given. The depth of magma generation and types of mantle sources are determined using isotopic data from previous studies. A model of plume-related generation of ultramafic alkaline magmas is proposed. |
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