GEOLOGIC AND GEOCHEMICAL FEATURES OF THE UPPER DEVONIAN COALS OF THE NORTH TIMAN (the Sula River Coal Field)
D.A. Bushnev1, N.S. Burdel’naya1, S.M. Snigirevsky2,3, P.A. Beznosov1,4, O.S. Kotik1, N.V. Pronina5, A.A. Grin’ko6
1Institute of Geology, Komi Science Center, Ural Branch of the Russian Academy of Sciences, Syktyvkar, Russia
2St. Petersburg State University, Saint Petersburg, Russia
3Komarov Botanical Institute, Russian Academy of Sciences, Saint Petersburg, Russia
4Kazan (Volga region) Federal University, Kazan, Russia
5Lomonosov Moscow State University, Moscow, Russia
6National Research Tomsk State University, Tomsk, Russia
Keywords: Сoal, coal producers, organic geochemistry, biomarker hydrocarbons, aromatic hydrocarbons, Upper Devonian, North Timan
Abstract
The composition of the oldest coals of the Timan-northern Urals region has been studied comprehensively, and their hydrocarbon and microcomponent characteristics are given. The relationship between different types of coals and Late Devonian plant communities of the North Timan is revealed. It is also determined that some samples contain microspores, megaspores, and plant remains belonging mainly to the lycopod Helenia . The most probable source of jet coals is identified as the wood of the progymnosperm Callixylon . The values of vitrinite reflectance and Tmax and the data on the distribution of polycyclic biomarkers and methylphenanthrenes indicate the low maturation of the coal organic matter. The coal bitumen investigated here is characterized by the dominance of steranes and diaster-13(17)-enes of compositions С28 and С29. The following diterpanes are identified: beyerane, 16α(H)-kaurane, 16β(H)-kaurane, and 16α(H)-atisane. At the same time, phyllocladane is absent.
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