Abstract
The paper reports a detailed coal-petrographic and mineralogical–geochemical study of humic coals and coaly rocks in the Upper Devonian Sargaevo deposits in North Timan (Sula River), which are an example of the burial of the oldest coal-forming plants. The following types of organic rocks are identified in the section: “jet-like” coal, liptobiolitic silty–argillaceous coal, and silty–argillaceous–coaly mixtolites. The studied coals and coaly rocks are mainly composed of humic organic components represented by vitrinite and liptinite macerals, with subordinate inertinite group. The vitrinite macerals include gelinite, collotelinite, and telinite (xylenite); the liptinite macerals include sporinite, cutinite, liptodetrinite, bituminite, alginite, and resinite, and the inertinite macerals include inertodetrinite, semifusinite, fusinite, and funginite. The vitrinite reflectance (RV, %) 0.45–0.55% corresponds to the insignificant organic maturity from proto- to meso-catagenesis (rank PC3–MС1). The mineral component of mixtolites and high-ash coals consists of kaolinite, chlorite/smectite (with a predominance of the chlorite component), and quartz.
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ACKNOWLEDGMENTS
We are grateful to S.M. Snigirevsky (St. Petersburg State University, St. Petersburg) for performed field studies and discussion of the results. V.P. Lyutoev (IG FRC, Syktyvkar) is thanked for the performance of analytical (EPR) studies and consultations. V.A. Saldin (IG FRC, Syktyvkar) is especially thanked for valuable advices and recommendations. We are grateful to reviewer, whose constructive comments significantly improved and supplemented the manuscript.
Funding
The studies were made in the framework of the government-financed projects of Institute of Geology, Federal Research Center, Komi Science Center, Ural Branch, Russian Academy of Sciences (project nos. NIOKTR 122040600010-8, 122040600013-9, and 122040600008-5) as well as the program “Priority 2030" of the Kazan (Volga Region) Federal University.
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Kotik, O.S., Pronina, N.V., Inkina, N.S. et al. Compositional Peculiarities of the Upper Devonian Coaly Rocks (The Sula River Section, North Timan). Lithol Miner Resour 58, 455–468 (2023). https://doi.org/10.1134/S0024490223700220
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DOI: https://doi.org/10.1134/S0024490223700220