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Climatic Fluctuations and Sedimentation Conditions of the Turonian–Coniacian Sediments of the Northwest Caucasus

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Abstract

The results of integrated study of the Turonian–Coniacian sediments from the Abinsky district (Northwest Caucasus), which are represented by a rhythmic terrigenous-carbonate sequence, are discussed. The use of microfacial, X-ray diffraction, isotope, and micropaleontological analyses allowed us to reveal important changes in abiotic and biotic evolution during this interval. The peculiarities of carbonate sedimentation, as well as changes in the composition of foraminiferal assemblages, helped to establish fluctuations in the relative sea level, whereas isotopic studies assisted in defining climatic fluctuations. During the periods of accumulation of carbonate and clayey material, the area was occupied by a relatively deep-water open-sea basin with normal salinity. In the background of high temperatures, cooling pulses are also recorded within the studied interval. The position of the Turonian–Coniacian boundary in the section is revised.

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ACKNOWLEDGMENTS

We are grateful to A.M. Nikishin for the advice on applicable terminology and V.L. Kosorukov for the help in processing and interpreting the results of X-ray diffraction analysis (both are employed at the Faculty of Geology, Moscow State University, Moscow). We acknowledge the colleagues from the laboratory of local methods of material studies, Department of Petrology, Moscow State University, for the opportunity of cooperation and obtaining high-quality images of foraminifer shells using a scanning-electron microprobe. We also appreciate the constructive criticism from the reviewers, Yu.D. Zakharov and E.Yu. Baraboshkin, whose useful notes improved the initial manuscript.

Funding

This work was supported by the Russian Foundation for Basic Research (project nos. 18-05-00495-a, 18-05-00503-a, and 19-05-00361-a).

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    E. V. Yakovishina, S. I. Bordunov, L. F. Kopaevich, D. A. Netreba & E. A. Krasnova

  2. Geological Institute, Russian Academy of Sciences, 119017, Moscow, Russia

    S. I. Bordunov

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  3. L. F. Kopaevich
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  4. D. A. Netreba
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  5. E. A. Krasnova
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Correspondence to E. V. Yakovishina.

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Reviewers: E.Yu. Baraboshkin and Yu.D. Zakharov

Translated by N. Astafiev

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Yakovishina, E.V., Bordunov, S.I., Kopaevich, L.F. et al. Climatic Fluctuations and Sedimentation Conditions of the Turonian–Coniacian Sediments of the Northwest Caucasus. Stratigr. Geol. Correl. 30, 147–166 (2022). https://doi.org/10.1134/S0869593822030066

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  • DOI: https://doi.org/10.1134/S0869593822030066

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