Occurrence of Tankhoy field coals in South Baikal bottom sediments
https://doi.org/10.21285/2686-9993-2021-44-3-285-292
Abstract
The purpose of the study is to describe the first finds of coal-bearing clays and coals in the bottom sediments of the southern basin of Lake Baikal and compare them with terrestrial coal-bearing deposits of the Tankhoy field. Comparative analysis of the lithological composition and colour of bottom sediments and terrestrial sections, as well as the concentration of organic carbon and conducted palynological analysis allowed their correlation. At the lake’s depth of 900 m the authors discovered a coal-bearing strata in situ (st 56), which later was stratigraphically correlated with the terrestrial coalbearing part of the Tankhoy suite. The fragments of coal found in bottom sediments basically along the entire Tankhoy field, especially bedrock coals on the underwater slope in South Baikal up to 1300 m deep prove the distribution of the coal-bearing part of the Tankhoy suite in the sublacustrine part of the lake throughout the entire slope (from 5 to 10 km offshore) and confirm the distribution area of the Tankhoy paleolake over a significant area of the contour of modern southern basin of Lake Baikal. The finds of coal-bearing strata on these and other various sub-bottom depths, i.e. under various pressure and temperature conditions, suggest that coals themselves and coal-bearing mudstones may be a generation facility of secondary microbial methane. This should be taken into account when searching for gas hydrocarbon and gas hydrate accumulations as well as assessing methane cycles in Lake Baikal.
Supporting agencies: This work was supported by the Russian Science Foundation grant 19-17-00226 “Reconstruction of formation mechanisms of problematic authigenic carbonates in diagenesis and catagenesis settings associated with hydrocarbon generation / oxidation”
About the Authors
O. M. Khlystov
Limnological Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Oleg M. Khlystov, Head of the Laboratory of Lake Baikal Geology, Senior Researcher
Irkutsk
A. V. Vainer-Krotov
Irkutsk National Research Technical University
Russian Federation
Russian Federation
Andrey V. Vainer-Krotov, Senior Lecturer of the Department of Physical Education
Irkutsk
A. V. Kitaev
Baikal State Nature Reserve
Russian Federation
Russian Federation
Aleksey V. Kitaev, Head of the Science Division
Tankhoy
T. V. Pogodaeva
Limnological Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Tatiana V. Pogodaeva, Cand. Sci. (Geol. & Mineral.), Senior Researcher of the Laboratory of Hydrochemistry and Atmospheric Chemistry
Irkutsk
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Review
For citations:
Khlystov O.M., Vainer-Krotov A.V., Kitaev A.V., Pogodaeva T.V. Occurrence of Tankhoy field coals in South Baikal bottom sediments. Earth sciences and subsoil use. 2021;44(3):285-292. (In Russ.) https://doi.org/10.21285/2686-9993-2021-44-3-285-292
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