Abstract
In this article, the results of the studies of the physicochemical properties and genesis of asphaltites from the deposits of Orenburg oblast are considered. Based on the data of a study on the distribution of hydrocarbon biomarkers (n-alkanes, isoprenanes, steranes, and terpanes), it was found that deposit formation occurred in carbonate layers under reducing conditions. The distribution of steranes and terpanes confirmed a sufficient maturity of the asphaltite. The C28/C29 sterane ratio of 0.31 corresponds to Silurian age according to Grantham or to Silurian–Devon age according to the pregnane coefficient (a ratio of the sum of C21–C22 pregnanes to the sum of C21–C22 pregnanes and C27–C29 regular steranes) of 9.0%. Thus, it is likely that asphaltites from the Ivanovka deposit in Orenburg oblast were redeposited in Silurian/Devon source rock formations.
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Original Russian Text © V.Yu. Kerimov, G.N. Gordadze, A.L. Lapidus, M.V. Giruts, R.N. Mustaev, E.M. Movsumzade, F.G. Zhagfarov, M.V. Zakharchenko, 2018, published in Khimiya Tverdogo Topliva, 2018, No. 1, pp. 59–67.
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Kerimov, V.Y., Gordadze, G.N., Lapidus, A.L. et al. Physicochemical Properties and Genesis of the Asphaltites of Orenburg Oblast. Solid Fuel Chem. 52, 128–137 (2018). https://doi.org/10.3103/S0361521918020064
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DOI: https://doi.org/10.3103/S0361521918020064