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ArticleName Analysis of cavity shapes and gas-and-fluid localizations in salt rocks of Starobin potash salt deposit
DOI 10.17580/gzh.2023.08.02
ArticleAuthor Andreiko S. S., Chaikovsky I. I., Getmanov V. N., Chayanov A. B.

Mining Institute, Ural Branch, Russian Academy of Sciences, Perm, Russia:

S. S. Andreiko, Head of Laboratory, Professor, Doctor of Engineering Sciences
I. I. Chaikovsky, Head of Laboratory, Doctor of Geological and Mineralogical Sciences,

Belaruskali, Solegorsk, Belarus:
V. N. Getmanov, Director of Mine Manegment 2
A. B. Chayanov, Director of Mine Manegment 1


The object of the study was fluid and mineral inclusions, as well as the composition of components of occluded gases in salt rocks of Starobin deposit using the example of Krasnoslobodsky mine of Belaruskali OJSC. Sylvinites, underlying rock salt, as well as rocks of the zone of replacement, leaching and recrystallization were studied. To identify the morphology and spatial localization of inclusions, a VEGA 3 LMH scanning electron microscope with an Oxford Instruments INCA Energy 250/X-max 20 X-ray energy-dispersive microanalysis system was used, and a 450-GC gas chromatograph was used to determine the gas content and components of occluded gases. Three groups of inclusions were identified. The primary ones were captured inside (spherical and cubic) and at the grain boundaries (smooth-walled slit-like cavities, bay-shaped, worm-shaped, drop-shaped, faceted). Secondary salts were formed during partial recrystallization (large intraand intergranular irregular shapes) and deformation of salts (elongated along dislocations and cleavage planes). Epigenetic channels, associated with the transit of undersaturated calcium chloride brines, were slit-like channels with a corrosion-regenerated wall surface, in which free gas can be localized, provoking gas-dynamic phenomena. The methane–nitrogen composition of occluded gases in salt rocks in Krasnoslobodsky mine, typical of Starobin deposit, was determined. Nitrogen of fluid inclusions is associated with atmospheric gas dissolved in the brine of the saline basin, hydrocarbons are associated with thermogenic transformation of buried organic matter, and hydrogen is associated with radiolysis of water. The increased content of carbon dioxide in the zones of leaching (dip troughs) and recrystallization is associated with the inflow of subsalt fluids along rift faults.

The study was supported by the Russian Foundation for Basic Research, project No. 20-45-596017 r_NOTs_Perm Krai.

keywords Starobin deposit, potassium salts, morphology and localization of fluid inclusions, components of gases

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