Nature and age of metamorphic rocks from the basement of the West Siberian megabasin (according to U-Pb isotopic dates) |
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Authors: | K. S. Ivanov Yu. N. Fedorov V. S. Ponomarev V. A. Koroteev Yu. V. Erokhin |
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Affiliation: | 1.Zavaritskii Institute of Geology and Geochemistry, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia;2.OOO KogalymNIPIneft’,Tyumen,Russia |
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Abstract: | The SHRIMP-II zircon U-Pb dates for metamorphic rocks from the West Siberian basement are determined for the first time. It is established that the major protolith of the metamorphic strata from the Shaimsk-Kuznetsovsk meganticlinorium is composed of sedimentary Late- and Middle-Devonian rocks (395–398 Ma). It is likely that the greywackes, whose strata were mainly formed under erosion of ophiolitic rocks, served as a substrate for the metamorphic rocks. The metamorphic transformations of the rocks occurred under conditions of greenschist and occasionally lower amphibolite facies of metamorphism during the Late Carboniferous-Early Permian period. |
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