Formation and structure of hypergenesis zone in the above-salt layer of the Verkhnekamskoe potassium salt deposit, Perm Krai, Russia

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Abstract

The paper describes the formation conditions and factors, as well as the structure and properties of rocks at the unique geological object within the Verknekamskoe potassium salt deposit, i.e., more than 90-m-thick zone of hypergenesis in the above-salt massif of interbedding terrigenous, terrigenous-carbonate and halogen deposits of lower Permian age, which covers the salt horizon of 300-700 m thickness. The geological history of the area is described in brief, which controls its geological and geomorphological structural features. The natural conditions and rock-transforming factors operating for millions of years are discussed. The composition, state and properties of rock in the hypergenesis zone are characterized, including their changes with the depth. This is important for the assessment and prediction of karst development in the considered area, as well as surface deformations and collapses.

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About the authors

Yu. A. Mamaev

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

Author for correspondence.
Email: mamaev47ya@mail.ru
Russian Federation, 13, str. 2, Ulanskii per., Moscow, 101000

A. A. Yastrebov

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

Email: mamaev47ya@mail.ru
Russian Federation, 13, str. 2, Ulanskii per., Moscow, 101000

References

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  7. Mamaev, Yu.A., Yastrebov, A.A. Formirovanie i osobennosti strukturno-tektonicheskogo plana territorii Verkhnekamskogo mestorozhdeniya kaliinykh solei v Permskom krae RF [Formation and structural-tectonic specifics of the Verkhnekamskoe potassium salt deposit territory, Perm krai, Russia]. Sergeevskie chteniya, vyp. 19, Moscow, RUDN, 2017, pp. 523-529 (in Russian).
  8. Osipov, V.I., Baryakh, A.A., Sanfirov, I.A., Mamaev, Yu.A., Yastrebov, A.A. Hydrogeomechanical conditions of karst sinkhole formation in the area of potassium mines in Berezniki town, Perm krai. Geoekologiya, 2016, no. 2, pp. 142-148 (in Russian)
  9. Osipov, V.I., Zverev, V.P., Kostikova, I.A., Mamaev, Yu.A. Hydrogeochemical features of water-rock interaction in Verchnekamskii saliferous basin. Geoekologiya, 2014, no. 5, pp. 404-409 (in Russian)
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2. Fig. 2. The structure and characteristics of the hypergenesis zone of the VKMKS territory according to geophysical studies. The results of digital processing of specialized studies: a - time section; b - dynamic time section; in - seismic section; 1 - conditional lower limit of the hypergenesis zone; 2 - pockets of highly weathered, leached, fissured, water-filled bedrock; characteristics of the zone of hypergenesis of rocks: ρ - density of rocks, g / cm3; n — porosity,%; V is the velocity of longitudinal waves, m / s.

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3. Fig. 3. Schematic section of the hypergenesis zone in the supra-salt strata of the Lower Permian VKMKS rocks.

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