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New Sedimentological, Magnetostratigraphic, and Palynological Data on the Upper Cretaceous Alan-Kyr Section (Central Crimea)

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Abstract

The results of sedimentological, palynological, and paleomagnetic studies of the Upper Cretaceous Alan-Kyr section (Central Crimea) are presented. The rock nomenclature is characterized and a deep-water genesis is determined. Based on the palynological data, the sediments are estimated as Lower Campanian and, partially, Upper Campanian (under two-part subdivision of the stage); palynomorphs are not found in the lower and upper parts of the section. A reverse polarity magnetozone distinguished in the lower part of the section is a probable analog of the C33r magnetic chron, whose base, according to the recommendations of Wolfring et al. (2018), should be used as a primary attribute to determine the lower boundary of the Campanian stage in the section. The obtained age data demonstrate significant differences relative to the dates inferred earlier from microfaunal data (Bragina et al., 2016).

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ACKNOWLEDGMENTS

The authors thank V.E. Pavlov, R.V. Veselovskii, and the other members of the Laboratory for the Main Geomagnetic Field and Petromagnetism (Schmidt Institute of Physics of the Earth, Russian Academy of Sciences) for the opportunity to use cryogenic magnetometer and to conduct thermomagnetic analysis. The authors acknowledge the reviewers, L.F. Kopaevich (Moscow State University), N.K. Lebedeva (Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences), and V.A. Fomin (Saratov State University), for their useful notes and comments.

Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-05-00784-a).

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Correspondence to A. Yu. Guzhikov, G. N. Aleksandrova or E. Yu. Baraboshkin.

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Translated by N. Astafiev

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Guzhikov, A.Y., Aleksandrova, G.N. & Baraboshkin, E.Y. New Sedimentological, Magnetostratigraphic, and Palynological Data on the Upper Cretaceous Alan-Kyr Section (Central Crimea). Moscow Univ. Geol. Bull. 75, 20–30 (2020). https://doi.org/10.3103/S0145875220010056

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