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Global Geology 2019, 22(4) 242-249 DOI:
10.3969/j.issn.1673-9736.2019.04.02 ISSN: 1673-9736 CN: 22-1371/P |
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| 论文 |
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Palynostratigraphy of Upper Cretaceous and boundary Paleogene deposits in West Siberian Plain |
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Natalya K. Lebedeva1,2, Olga B. Kuzmina1 |
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1. Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Brunch of Russian Academy of Sciences, Novosibirsk 630090, Russia;
2. Novosibirsk State University, Novosibirsk 630090, Russia |
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摘要：
The article presents the results of many years of studies of the Upper Cretaceous and Paleogene sediments in the territory of West Siberian Plain. The heterogeneous structure of these sediments in different regions of the plain is shown. The lithological and palynological characteristics of a number of studied wells drilled in different years in Omsk and Kulunda Depressions, in Baraba Lowland and Bakchar Basin are given. The obtained palynological data allowed to substantiate the age of the deposits and to make suggestions concerning their depositional environment, and to clarify the subdivision of geological section into formations. The sections of the Upper Cretaceous and Paleogene deposits in different lithofacial regions of the Western Siberia differ from each other in completeness, genesis, and paleontological characteristics. The Upper Cretaceous sediments in Western Siberia are represented by formations of both marine (Pokur, Kuznetzovo, Ipatovo, Slavgorod and Gan'kino Formations) and continental genesis (Lenkovo and Sym formations). The Paleogene sediments, with the exception of Oligocene, mostly have a marine genesis-these are Talitsa-, Marsyat-, Lulinvor-, Tavda-and Yurki formations, but there are also continental sediments (Ostrovnoje Formation). A large stratigraphic break in the Upper Cretaceous and Paleogene boundary deposits, covering a significant part of the Maastrichtian, Paleocene, Ypresian, and Lutetian stages of the Eocene, was established in the sourheast of the West Siberian Plain (Bakchar Basin, Baraba Lowland and Kulunda Depression). The most complete sections are located in the Omsk Depression, where the Upper Cretaceous Gan'kino Formation is covered by Talitsa and Lulinvor Formations of Paleogene age. The most important events occurring at the boundary of the Cretaceous and Paleogene in Western Siberia can be traced currently in a few sections located in the Trans-Ural area, since there was no sedimentation in the rest of the territory at that time. |
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关键词：
palynostratigraphy
Upper Cretaceous
Paleogene
boundary
deposits
West Siberian Plain
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Palynostratigraphy of Upper Cretaceous and boundary Paleogene deposits in West Siberian Plain |
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|
Natalya K. Lebedeva1,2, Olga B. Kuzmina1 |
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1. Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Brunch of Russian Academy of Sciences, Novosibirsk 630090, Russia;
2. Novosibirsk State University, Novosibirsk 630090, Russia |
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|
Abstract:
The article presents the results of many years of studies of the Upper Cretaceous and Paleogene sediments in the territory of West Siberian Plain. The heterogeneous structure of these sediments in different regions of the plain is shown. The lithological and palynological characteristics of a number of studied wells drilled in different years in Omsk and Kulunda Depressions, in Baraba Lowland and Bakchar Basin are given. The obtained palynological data allowed to substantiate the age of the deposits and to make suggestions concerning their depositional environment, and to clarify the subdivision of geological section into formations. The sections of the Upper Cretaceous and Paleogene deposits in different lithofacial regions of the Western Siberia differ from each other in completeness, genesis, and paleontological characteristics. The Upper Cretaceous sediments in Western Siberia are represented by formations of both marine (Pokur, Kuznetzovo, Ipatovo, Slavgorod and Gan'kino Formations) and continental genesis (Lenkovo and Sym formations). The Paleogene sediments, with the exception of Oligocene, mostly have a marine genesis-these are Talitsa-, Marsyat-, Lulinvor-, Tavda-and Yurki formations, but there are also continental sediments (Ostrovnoje Formation). A large stratigraphic break in the Upper Cretaceous and Paleogene boundary deposits, covering a significant part of the Maastrichtian, Paleocene, Ypresian, and Lutetian stages of the Eocene, was established in the sourheast of the West Siberian Plain (Bakchar Basin, Baraba Lowland and Kulunda Depression). The most complete sections are located in the Omsk Depression, where the Upper Cretaceous Gan'kino Formation is covered by Talitsa and Lulinvor Formations of Paleogene age. The most important events occurring at the boundary of the Cretaceous and Paleogene in Western Siberia can be traced currently in a few sections located in the Trans-Ural area, since there was no sedimentation in the rest of the territory at that time. |
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Keywords:
palynostratigraphy
Upper Cretaceous
Paleogene
boundary
deposits
West Siberian Plain
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收稿日期 2019-10-12 修回日期 2019-11-29 网络版发布日期 |
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DOI: 10.3969/j.issn.1673-9736.2019.04.02 |
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| 参考文献： |
Gnibidenko Z N, Lebedeva N K, Levicheva A V. 2015. Magnetostratigraphy of the Campanian-Maastrichtian Bakchar Basin (southeastern West Siberia).Russian Geology and Geophysics,56(11):1652-1661.
Iakovleva A I, Aleksandrova G N. 2013. The problem of dinocyst zonation of the Paleocene-Eocene deposits of Western Siberia.Byulleten Moskovskogo Obchestva Ispytatelei Prirody, Otdel Geologii,88(1):59-81.
Iakovleva A I. 2012. Age refinement of Lyulinvor Formation in the southwestern Siberia based on palynological and paleomagnetic data. Byulleten Moskovskogo Obchestva Ispytatelei Prirody, Otdel Geologii,87(3):53-87.
Kazanskii Y P. 1963. Melovye i paleogenovye osadochnye formatsii Srednego Priob'ya Cretaceous and Paleogene Sedimentary formations in the Middle Ob River. Novosibirsk Izdatel'stvo Sibirskogo Otdeleniya Akademii Nauk SSSR,18:354.
Kuzmina O B, Volkova V S, Lebedeva N K. 2003. Upper Cretaceous and Cenozoic microphytofossils and magnetostratigraphy of the southeastern part of the West Siberian Lowland.Russian Geology and Geophysics,44(4):348-363.
Lebedeva N K, Aleksandrova G N, Shurygin B N,et al. 2013. Paleontological and magnetostratigraphic data on Upper Cretaceous deposits from borehole no. 8 (Russkaya Polyana District, Southwestern Siberia).Stratigraphy and Geological Correlation,21(1):48-78.
Lebedeva N K, Kuzmina O B, Sobolev E S,et al. 2017.Stratigraphy of Upper Cretaceous and Cenozoic deposits of the Bakchar iron ore deposit (Southwestern Siberia):new data.Stratigraphy and Geological Correlation,25(1):76-98.
Lebedeva N K, Kuzmina O B. 2018. Palynostratigraphy of the Upper Cretaceous and Paleogene deposits in the south of Westen Siberia by example of Russkaya Polyana Boreholes, Omsk Trough.Stratigraphy and Geological Correlation,26(1):80-108.
Vasilyeva O N. 2018. Dinocysts and biostratigraphy of Paleogene of the Trans Ural area, Turgai trough and Caspian Depression:PhD Thesis. Novosibirsk:IPGG SB RAS. |
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