Permo-Triassic stage of alkaline magmatism in the Vitim plateau (western Transbaikalia) |
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| Authors: | AG Doroshkevich IA Izbrodin MO Rampilov GS Ripp EI Lastochkin VB Khubanov |
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| Institution: | 1. Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia;2. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russiaa |
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| Abstract: | We present results of geochronological (40Ar-39Ar, U-Pb SHRIMP-II, and LA-ICP-MS) and geochemical studies of alkaline rocks of the Amalat, Sirikta, Tsipa, Pravyi Uligli, and Verkhnii Uligli massifs in the Vitim plateau (western Transbaikalia). The formation of the alkaline rocks and the accompanying albitization are dated at 261-242 Ma. The isotope inhomogeneity (?Nd(T) = + 8.4 to -1.7) of the alkaline rocks indicates the heterogeneous composition of the source of their material, having a depleted component, an enriched juvenile metasomatic fluid, and a crustal substrate. |
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| Keywords: | alkali and nepheline syenites Permo-Triassic stage of magmatism geochronological and isotope data albitization sources of material |
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