Sequence composition of the Izyayu Formation (Upper Devonian–Lower Carboniferous) in the type area – the south of Tchernyshev Uplift
https://doi.org/10.24930/1681-9004-2021-21-4-546-559
Abstract
Research subject. The article considers the Famennian‑Tournaisian sequence of the South-Eastern part of the Tchernyshev Uplift (North Cis-Uralian). The sequence corresponds to the Izyayu Formation.
Materials and methods. The article is focused on the clarification of the stratigraphy, composition and depositional environment of this formation. Research data about the Izyayu Formation in the type area (Izyayu River) were used. The stratigraphic framework of this study included data on conodonts, foraminifers and carbonate carbon isotopic shifts.
Results. In the type area under study, the Izyayu Formation corresponds to the interval from the upper part of the Famennian (upper part of the Palmatolepis marginifera utahensis conodont Zone) up to the middle part of the Tournaisian (Lower crenulata conodont Zone). The formation is 100– 120 m thick. The Izyayu Formation grades to the upper part of the deep-water Syvyu Formation in the east, and to the shallow-water Kamenka Formation and the lower part of the Ydzhid Formation. The areal of the Izyayu Formation comprises the South-Eastern part of the Tchernyshev Uplift. The Formation was deposited in the environment of a gentle prograding slope of a carbonate platform.
Conclusions. The Izyayu Formation in the type area is composed of thin clayey-carbonate graded cycles. It covers the stratigraphic interval from the Zelenets Regional Stage through the Tcherepet Regional Stage. This formation is easily distinguishable by lithological features in outcrops and borehole cores.
About the Authors
A. V. Zhuravlev
Institute of Geology Komi SC UB RAS
Russian Federation
Russian Federation
54 Pervomaiskaya st., Syktyvkar 167000
Ya. A. Vevel
Institute of Geology Komi SC UB RAS
Russian Federation
Russian Federation
54 Pervomaiskaya st., Syktyvkar 167000
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Review
For citations:
Zhuravlev A.V., Vevel Ya.A. Sequence composition of the Izyayu Formation (Upper Devonian–Lower Carboniferous) in the type area – the south of Tchernyshev Uplift. LITHOSPHERE (Russia). 2021;21(4):546-559. (In Russ.) https://doi.org/10.24930/1681-9004-2021-21-4-546-559
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