The geology of carbonaceous deposits (Carboniferous) of the South Urals (Fedorovskaya sequence, Sukharysh syncline)

A.V. Snachev

Institute of Geology, Ufa Federal Research Center, Russian Academy of Sciences, Ufa, 450077 Russia

ORIGINAL ARTICLE

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DOI: 10.26907/2542-064X.2021.2.264-273

For citation: Snachev A.V. The geology of carbonaceous deposits (carboniferous) of the South Urals (Fedorovskaya sequence, Sukharysh syncline). Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2021, vol. 163, no. 2, pp. 264–273. doi: 10.26907/2542-064X.2021.2.264-273.

Для цитирования: Snachev A.V. The geology of carbonaceous deposits (Carboniferous) of the South Urals (Fedorovskaya sequence, Sukharysh syncline) // Учен. зап. Казан. ун-та. Сер. Естеств. науки. – 2021. – Т. 163, кн. 2. – С. 264–273. – doi: 10.26907/2542-064X.2021.2.264-273.

Abstract

The geological structure of coal formations of the Sukharysh syncline, which is located in the Kopeysk-Bredy subzone of the Alapaevsk-Adamovka structural-formational zone, was studied. The focus was specifically on the deposits of the Fedorovskaya sequence (C₂fd) with outcrops in the sections along the Uvelka River and in few roadside pits. The width of the sequence is about 1000 m. The Middle Carboniferous (Bashkirian) age of the deposits was reliably dated based on the fossil faunal finds. It was shown that shales and aleurolites, which are widespread in the limestones of the Fedorovskaya sequence, belong to the low-carbon type and fall into the field of the siliceous-carbonate unit. The carbonaceous matter is developed in the form of scattered impurities, concentrated in the ultrafine veinlets and laminas, and corresponds to higher kerites subjected to catagenesis and the early stage of green shales facies. The organic carbon content is up to 20%, and, thus, the rock appears to be opaque. Sedimentation process took place in the isolated local shallow-water depressions under the geodynamic conditions of collision. The terrigenous material was formed as a result of the destruction of the underlying rocks of the major and average element composition of the Berezinskaya sequence. The maturity of the deposits consistently increases from the Tugundinskaya to Fedorovskaya sequences.

Keywords: South Urals, Sykharysh syncline, Fedorovskaya sequence, stratigraphy, paleogeography, carbonaceous shales, black shales, TOC, Carboniferous

Acknowledgments. Thanks to R.R. Islamov and K.R. Nurieva for taking part in the fieldwork, E.O. Kalistratova for the help in description of the microsections of the samples, as well as T.I. Chernikova and S.A. Yagudin for their analytical research.

The study was performed as part of the State Assignment (project no. 0246-2019-0078).

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Received

April 12, 2021

Snachev Alexander Vladimirovich, Candidate of Geological and Mineralogical Sciences, Head of the Ore Deposits Laboratory

Institute of Geology – Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences

ul. Karla Marksa, 16/2, Ufa, 450077 Russia

E-mail: SAVant@rambler.ru

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