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Palynostratigraphy of the Cretaceous and Paleogene Sediments of Chelyabinsk Oblast, South Transurals

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Abstract

The results of a palynological study of the Upper Cretaceous and Paleogene sediments of three boreholes drilled in the South Transurals are presented. The Upper Cretaceous Kuznetsovo, Kamyshlov, Zaikovo, Fadyushino, and Gan’kino formations are exposed by Boreholes 3, 9, and 13, which contain four spore and pollen biostratons. Five dinocyst biostratons are identified for the first time: local zone with Chatangiella spectabilis, local zone with Spinidinium sverdrupianum, local zone with Chatangiella chetiensis, local zone with Chatangiella manumii–Dinogymnium spp., and local zone with Cerodinium diebelii. The comparison of the Late Cretaceous dinocyst assemblages of the southern and northern territories of Western Siberia shows that, in spite of significant provincialism of dinoflagellates, there is a series of stratigraphic intervals in the middle–upper Turonian, lower Coniacian, lower Santonian, Campanian, and lower Maastrichtian, which have interregional correlation potential. In the Talitsa, Serov, Irbit, and Chegan formations, intervals of six zones of the Thanetian–Bartonian age of the dinocyst scale of Western Siberia are identified in Borehole 9 (Alisocysta margarita, Apectodinium hyperacanthum, Deflandrea oebisfeldensis (acme), Dracodinium simile, Rhombodinium draco, and Rh. ornatum), as well as five local zones by spores and pollen. The Kurtamysh Formation is characterized by a Rupelian spore and pollen assemblage. Significant sedimentation hiatuses in the Cretaceous–Paleogene sequence corresponding to the upper part of the Maastrichtian, the most part of the Danian and Selandian, the lowermost parts of the Ypresian, middle–upper Ypresian, Lutetian, the upper parts of Bartonian, Priabonian, and the lower parts of the Rupelian are established.

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ACKNOWLEDGMENTS

The authors are grateful to A.I. Iakovleva, A.B. Herman, Yu.B. Gladenkov, and A.S. Alekseev for valuable comments and advice that improved the quality of the manuscript.

Funding

This work was supported by state contract no. 0331-2019-004, the Russian Foundation for Basic Research (project no. 20-05-00076), and IGCP project 679.

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Authors and Affiliations

  1. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    O. B. Kuzmina & N. K. Lebedeva

  2. Novosibirsk State University, 630090, Novosibirsk, Russia

    N. K. Lebedeva

  3. OAO Chelyabinskgeosiemka, 454048, Chelyabinsk, Russia

    N. E. Shchulkina

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Kuzmina, O.B., Lebedeva, N.K. & Shchulkina, N.E. Palynostratigraphy of the Cretaceous and Paleogene Sediments of Chelyabinsk Oblast, South Transurals. Stratigr. Geol. Correl. 29, 215–240 (2021). https://doi.org/10.1134/S0869593821020040

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