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The Biostratigraphy and Lithological Features of the Lower Carboniferous Urmugteyul Formation (Orkhon Trough, Northern Mongolia)

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Abstract

The results of a biostratigraphic and lithological study of the terrigenous Lower Carboniferous Urmugteyul Formation in the stratotype area (the left bank of the Sharyn-Gol River, Orkhon Trough) are reported. The formation includes four members: the first three are assinged to the Lower Urmugteyul Subformation; the fourth, to the Upper Urmugteyul Subformation. The palynological studies allowed us to limit the period of accumulation of the Lower Urmugteyul Subformation by the Late Tournaisian, and the Upper Urmugteyul Subformation, by the Late Visean. The nature of the structure and lithological features of the section considered as part of two terrigenous facies associations, as well as the paleontological characteristics and analysis of palynofacies, indicate that the accumulation of the Lower Urmugteyul Subformation occurred in the setting of the alluvial–deltaic plain, while the Upper Urmugteyul Subformation was formed in the shallow-water part of the shelf.

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Notes

  1. On the modern geological maps of Mongolia.

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AKNOWLEDGMENTS

The authors are sincerely grateful to the referees L.I. Popeko and A.S. Byakov for valuable comments that significantly improved the article. We also thank L.I. Vetluzhskikh, who took part in the collection of fauna; L.G. Peregoedov and S.V. Naugolnykh for preliminary information on identification of brachiopods and flora; N.N. Egorova for the description of petrographic thin sections; V.V. Minin, M.Sh. Bardina, and N.G. Yadrishchenskaya for help in preparation of the illustrations for this paper.

Funding

The study was carried out as a part of the State Assignment of the Geological Institute, Siberian Branch, Russian Academy of Sciences, project no. IX.124.1.3 Evolution of Magmatism and Sedimentation, Relationships to the Geodynamic Evolution of the Caledonian and Hercynian Continental Crust of the Central Asian and Mongol–Okhotsk Fold belts (State reg. no. АААА-А17-117011650013-4), and was supported by the Russian Foundation for Basic Research, project no. 18-05-00234.

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Recommended for publishing by L.I. Popeko

Translated by A. Bobrov

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Minina, O.R., Kurilenko, A.V., Ariunchimeg, I. et al. The Biostratigraphy and Lithological Features of the Lower Carboniferous Urmugteyul Formation (Orkhon Trough, Northern Mongolia). Russ. J. of Pac. Geol. 15, 538–554 (2021). https://doi.org/10.1134/S1819714021060063

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