Coal facies of the Middle Permian Baruunnaran deposit, South Mongolia

Authors

  • Batbold Demberelsuren Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia https://orcid.org/0000-0003-4407-002X
  • Luvsanchultem Jargal Department of Geology and Geophysics, Faculty of Earth Science, National University of Mongolia, Ulaanbaatar 14200, Mongolia https://orcid.org/0000-0002-0602-667X
  • Baatar Munkhtsengel Department of Geology and Hydrogeology, School of Geology and Mining Engineering, Mongolian University of Science and Technology, Ulaanbaatar, 14191, Mongolia https://orcid.org/0000-0002-9644-3599
  • Said Lkhagva-Ochir Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia
  • Ranjin Ganzorig Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia https://orcid.org/0009-0008-2782-2334
  • Adiya Tsolmon Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia https://orcid.org/0000-0002-4088-7027
  • Chuluunbat Enkhbat Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia
  • Erdenebat Turbat Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia
  • Enkhtuvshin Tuvshinbayar Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia
  • Ariya Tugsjargal Ukhaakhudag coal mine, Branch of Energy Resource LLC, Tsogttsetsii, 46000, Umnugovi, Mongolia

DOI:

https://doi.org/10.5564/mgs.v28i57.3236

Keywords:

Tavantolgoi Formation, South Gobi Basin, Organic matter, organic petrology, paleoenvironment conditions, ancient peat mires

Abstract

The Baruunnaran coal deposit is located in the northeastern part of the South Gobi Basin, southern Mongolia, and hosted in the middle Permian Tavantolgoi Formation. In this paper we present indices of coal facies determined from 34 coal samples obtained from three seams in the lower and upper part of the formation (III, IXG and X), by studying their organic petrography and the geochemistry of the coal ash. The results of coal petrography revealed that seams III, IXG and X are composed of 46.9-80.9 vol.% vitrinite, 11.6-47.5 vol.% inertinite and 1.2-18.2 vol.% liptinite. In samples from seams III and X the average content of mineral matter is low at 11 and 13.4 vol.%, respectively, and 6.3 vol.% in seam IXG, and consists of clay, silica, pyrite, carbonate, and other minerals. The inorganic content mostly occurs as fillings of cell cavities, cracks, and fissures of vitrinite and inertinite macerals. The vitrinite random reflectance values range from 0.81-1.07%. The Gelification Index and Tissue Preservation Index suggest the peats accumulated in wet forest swamp environments with high tree density. The majority of the seams accumulated in mildly oxic to anoxic conditions with good tissue preservation. The peat mire water ranged from weakly to strongly acidic. Further, it was determined by Al2O3/TiO2 ratios that the clastic sediments were probably sourced from volcanic basement characterized by intermediate felsic composition.

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Published

2023-12-30

How to Cite

Demberelsuren, B., Jargal, L., Munkhtsengel, B., Lkhagva-Ochir, S., Ganzorig, R., Tsolmon, A., Enkhbat, C., Turbat, E., Tuvshinbayar, E., & Tugsjargal, A. (2023). Coal facies of the Middle Permian Baruunnaran deposit, South Mongolia. Mongolian Geoscientist, 28(57), 71–91. https://doi.org/10.5564/mgs.v28i57.3236

Issue

Vol. 28 No. 57 (2023)

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Articles

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Copyright (c) 2023 Batbold Demberelsuren, Luvsanchultem Jargal, Baatar Munkhtsengel, Said Lkhagva-Ochir, Ranjin Ganzorig, Adiya Tsolmon, Chuluunbat Enkhbat, Erdenebat Turbat, Enkhtuvshin Tuvshinbayar, Ariya Tugsjargal

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