Abstract
Granites, especially those that were decompressed as a result of processes of secondary transformations and tectonic movements, hold the greatest potential in the search for oil-bearing rocks in basements of sedimentary basins. Owing to the chemical dating of monazites from collision granites of the East Shebur area, the isochrone age of 274.5 ± 21 Ma was obtained. Zircons (SHRIMP-II) yield a concordant age of 277.5 ± 2 Ma (MSWD = 0.77). The Rb–Sr isochrone age of granites (247.4 ± 9.1 Ma) coincides with the emplacement time of the West Siberian rift system. This age records the process of intruding East Shebur granites into the upper crust level during riftogenesis and the extension of the study area. The younger age datings (231 Ma, 60 Ma (U–Pb); 220 Ma (K–Ar)) record the stages of tectonomagmatic activation, recorded in the basement of the Western Siberia oil-bearing areas.
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Original Russian Text © K.S. Ivanov, V.A. Koroteev, Yu.V. Erokhin, V.V. Khiller, 2017, published in Doklady Akademii Nauk, 2017, Vol. 474, No. 1, pp. 56–59.
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Ivanov, K.S., Koroteev, V.A., Erokhin, Y.V. et al. Three stages of geological evolution of granites from the Uralian part of the basement of the West Siberian platform. Dokl. Earth Sc. 474, 520–523 (2017). https://doi.org/10.1134/S1028334X1705004X
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DOI: https://doi.org/10.1134/S1028334X1705004X