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STRATIGRAPHY AND FORMATION CONDITIONS OF CALLOVIAN AND UPPER JURASSIC DEPOSITS OF THE CENTRAL PART OF THE KAZYM-KONDA REGION (WEST SIBERIA)

V. A. Marinov 1, A. S. Alifirov 2, V. A. Bumagina 1, A. E. Igolnikov 2, A. I. Kudamanov 1, E. B. Avramenko 1, M. A. Grishchenko 1, M. D. Smyshlyaeva 1

The results of stratigraphic and facies studies of the Callovian and Upper Jurassic of the Kazym-Konda facies region (West Siberia) are presented. The sequence of subdivisions of the boreal zonal standard is established. The section is composed of rocks with predominantly shallow marine genesis; their composition depended on sedimentation cyclicity and sea level fluctuations. The highest incoming rates of sedimentary material were associated with transgressive episodes in the Callovian, Middle Oxfordian and Middle Volgian. Stratigraphic breaks and periods of deficient sedimentation in the Late Oxfordian, Kimmeridgian, Early Volgian and Late Volgian correspond to regressive episodes in the section.

Keywords: Callovian and Upper Jurassic, litho-biostratigraphy, paleogeography, West Siberia.

DOI 10.20403/2078-0575-2021-2-3-16

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