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Age and genesis of the Upper Cenozoic deposits of the Tyumen oblast (Western Siberia) enriched in biogenic silica

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Abstract

An integrated micropaleontological study of deposits enriched in biogenic silica was conducted on material drilled in the Zyryanka and Uspenka fields of the southwestern Tyumen oblast (Western Siberia). The data obtained on palynology and diatoms allowed the assignment of the Zyryanka Field to the Turtas Formation (lower part of the Chattian Stage of the Oligocene) and the deposits of the Uspenka Field to be dated as Pleistocene. The absence in the Zyryanka Field diatom assemblage of in situ marine taxa and the mass occurrence of freshwater species, gemmuloscleres of freshwater sponges, and zygospores of Zygnematales algae suggest that a nonmarine basin existed in the early Turtas time. A considerable proportion of redeposited diatoms and dinocysts in the Quaternary deposits of the Uspenka Field suggest strong erosional processes during the time of deposition.

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Authors and Affiliations

  1. Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia

    G. N. Aleksandrova & T. V. Oreshkina

  2. Tyumen State Oil and Gas University, ul. Respubliki 47, Tyumen, 625000, Russia

    P. V. Smirnov & A. O. Konstantinov

  3. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, pr. Akad. Koptyuga 3, Novosibirsk, 630090, Russia

    O. B. Kuzmina

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  1. G. N. Aleksandrova
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  4. A. O. Konstantinov
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  5. O. B. Kuzmina
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Original Russian Text © G.N. Aleksandrova, T.V. Oreshkina, P.V. Smirnov, A.O. Konstantinov, O.B. Kuzmina, 2017, published in Stratigrafiya, Geologicheskaya Korrelyatsiya, 2017, Vol. 25, No. 4, pp. 62–88.

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Aleksandrova, G.N., Oreshkina, T.V., Smirnov, P.V. et al. Age and genesis of the Upper Cenozoic deposits of the Tyumen oblast (Western Siberia) enriched in biogenic silica. Stratigr. Geol. Correl. 25, 419–444 (2017). https://doi.org/10.1134/S0869593817040037

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