U-Pb (SHRIMP-II) isotope dating of zircons from alkali rocks of Vitim province,West Transbaikalia |
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| Authors: | A G Doroshkevich G S Ripp S A Sergeev |
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| Institution: | 1.Geological Institute, Siberian Branch,Russian Academy of Sciences,Ulan-Ude,Russia;2.Karpinskii All-Russia Geologic Institute,St. Petersburg,Russia |
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| Abstract: | A U-Pb (SHRIMP-II) geochronological study of rocks from the Sayzhenski, Snezhny and Nizhne-Burulzayski massifs, incorporated
into the Vitim alkali province (Sayzhenski Complex) has been made. The acquired data indicate that the rocks formed in the
interval of 520-486 Ma. The proximity of their age to accretionary-collision processes in the Central Asian fold belt, accompanied
by intràplate magmatism, has been noted. Two independent stages in the evolution of Vitim Province magmatism are suggested:
Early Paleozoic (520-485 Ma) and Late Paleozoic (350-290 Ma). |
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