L.F. Mametova. PYRITIZATION OF THE MIDDLE CARBONIFEROUS SANDSTONES OF THE DONBAS

https://doi.org/10.15407/mineraljournal.42.02.014

UDC 552.513:553.661.2(477.61/62)

PYRITIZATION OF THE MIDDLE CARBONIFEROUS SANDSTONES OF THE DONBAS

L.F. Mametova, PhD (Geology), Senior Research Fellow.

M.S. Polyakov Institute of Geotechnical Mechanics of the NAS of Ukraine

49005, Dnipro, Ukraine, Simferopolska Str., 2a

E-mail: wolya45@gmail.com

https://orcid.org/0000-0001-6198-7337

A. Mirek, Candidate of Technical Science, President. State Mining Authority.

40-055 Katowice, Poland, Poniatowskiego Str., 31

E-mail: prezes@wug.gov.pl

https://orcid.org/0000-0002-2824-8177

Ye.S. Kozii, PhD (Geology), Deputy Director.

Dnipro University of Technology

49005, Dnipro, Ukraine, Dmytro Yavornytskyi Ave., 19

E-mail: koziy.es@gmail.com

https://orcid.org/0000-0002-2167-6224

Language: English

Mineralogical journal 2020, 42 (2): 14-19

Abstract:

Coal mining is linked with such phenomena as sudden gas outburst, explosions, and ignition of coal seams. Among the preconditions for explosions, emissions and possible inflammations, the process of pyritization of rocks of the geological cross-sections of the Donbas basin is poorly known, and the transformation of accessory pyrite minerals has not been studied. The purpose of the work is research of the pyritization of Carboniferous sandstones of coal-bearing sediments of this basin. Diagenetic and catagenetic pyrite can be distinguished. The investigation of secondary (сatagenetic) mineral transformation of terrigenous coal deposits shows the interaction of geochemical and tectonic processes. Pyritization is part of a geochemical process, they occur discretely in coal-bearing strata. Catagenesis is accompanied by the phenomenon of heating and burning. Pyrite activates these phenomena, and promotes the burning of coal seams and gases. The authors demonstrate a highly variable distribution of ferrous compounds in a sandstone layer either along-strike or across layer thickness. Variations in the content of FeS2 can be related to the transformation of marcasite to pyrite. The results can be the basis for the development of criteria for assessing the tendency of coal deposits to spontaneous combustion.

Keywords: pyrite, sandstones, pyritization, spontaneous combustion of coal seams, explosions, emissions, geological cross-section, Donbas.

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