Palynostratigraphy of the Upper Cretaceous and Paleogene Deposits in the South of Western Siberia by Example of Russkaya Polyana Boreholes, Omsk Trough


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Abstract

The detailed study of Boreholes 8, 10, and 2 in the Russkaya Polyana district (Omsk Trough) made it possible to reveal the complex structure of the Upper Cretaceous sediments formed in unstable conditions of the marginal part of the Western Siberian basin. The Pokur, Kuznetsovo, Ipatovo, Slavgorod, and Gan’kino formations were subjected to palynological analysis and substantiation of their Late Cretaceous age. Eight biostratigraphic units with dinocysts and five units with spores and pollen from the Albian to the Maastrichtian were identified. The joint application of biostratigraphic and magnetostratigraphic methods made it possible to reveal the stratigraphic breaks in the studied sedimentary stratum and to estimate their scope. The age of the Lower Lyulinvor Subformation was specified in the marginal part of the Omsk Trough. The ingression traces of the Western Siberian basin in the Albian were found for the first time in the considered region.

About the authors

N. K. Lebedeva

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch; Novosibirsk State University

Author for correspondence.
Email: LebedevaNK@ipgg.sbras.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090

O. B. Kuz’mina

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch

Email: LebedevaNK@ipgg.sbras.ru
Russian Federation, Novosibirsk, 630090

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