Age and source of terrigenous rocks of the turan group of the bureya terrane of the eastern part of the central Asian foldbelt: Results of geochemical (Sm-Nd) and geochronological (U-Pb LA-ICP-MS) studies |
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| Authors: | A A Sorokin Yu V Smirnov A B Kotov V P Kovach |
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| Institution: | 1. Institute of Geology and Natural Management, Far East Branch, Russian Academy of Sciences, per. Relochnyi 1, Blagoveshchensk, 675000, Russia
2. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, nab. Makarova 2, St. Petersburg, 199034, Russia
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| Abstract: | According to Sm-Nd isotopic-geochemical studies, the t Nd(DM) of the terrigenous rocks of the Turan Group of the Bureya terrane is 1.4–1.5 Ga and their sources are Precambrian rocks and (or) younger effusive rocks, the formation of which is related to the reworking of the Late Precambrian continental crust. The U-Pb LA-ICP-MS geochronological studies indicate dominant Vendian-Cambrian (588–483 Ma) and Late Riphean (865–737 Ma) detrital zircons. Our data point to their accumulation at the beginning of the Paleozoic rather than in the Precambrian as is accepted in modern stratigraphic schemes. |
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