UDC 556.12:546.45:504
Malkova Y., Panasyuk M., Sosonna N.
Malkova Y. Ph.D. (Geol. Sciences), jun. res. fellow, State Institution “Institute of Environmental Geochemistry of the National Academy of Sciences of Ukraine”, ave. Academician Palladin, 34a, Kyiv, 03680, Ukraine E-mail: malkovayanakiev@gmail.com, ORCID: https://orcid.org./0000-0002-6215-9901
Panasyuk M. Ph.D. (Ingen. Sciences), sen. res. fellow, Institute for Safety Problems of Nuclear Power Plants National Academy of Sciences of Ukraine, Kirova str 36a, Chornobyl, 07270, Ukraine E-mail: nipanasyuk53@gmail.com ORCID: https://orcid.org/0000-0003-3607-344X
Sosonna N. jun. res. fellow, Institute for Safety Problems of Nuclear Power Plants National Academy of Sciences of Ukraine, Kirova str 36a, Chornobyl, 07270, Ukraine E-mail: natalyasosonnaya@gmail.com ORCID:Orcid.org/0000-0002-9913-3457
DOI:
Pages:
HYDROGEOCHEMICAL PATTERNS OF THE AQUIFER IN HOLOCENE AND UPPER NEOPLEISTOCENE ALLUVIAL DEPOSITS OF THE KALUSH–HOLYNSKY POTASH SALT DEPOSIT
Abstract. The main potential sources of salinization of the aquifer within the Holocene and Upper Neopleistocene alluvial deposits of the Kalush–Holynsky potash salt deposit have been analyzed. The hydrogeological conditions of the aquifer, which serves as the only source of drinking water for the Kalush region, have been studied. To determine the levels and directions of salinization spread, as well as to forecast changes in hydrogeological and hydrogeochemical conditions, water samples were collected from 16 observation wells located within the drainage influence zone of the Dombrovsky quarry, and groundwater levels were measured. Based on the sampling results and analyzed chemical data from 2019–2023, the dynamics of mineralization changes and the sources of contamination of the gravel–pebble aquifer were determined. The hydrogeological conditions of the aquifer in holocene and upper neopleistocene alluvial deposits — the only source of drinking water in the Kalush region — have been studied. To determine the levels and directions of salinization spread, as well as to forecast changes in hydrogeological and hydrogeochemical conditions, water samples were collected from 16 observation wells located within the drainage influence zone of the Dombrovskyi quarry, and groundwater levels were measured. Based on the sampling results and chemical analyses for 2019–2023, the dynamics of mineralization changes and the sources of contamination in the aquifer in holocene and upper neopleistocene alluvial deposits were determined. A mineralization map of the study area was constructed. A salinization halo is identified downstream from the area of tailings ponds No. 1, 2, and 3, and the shaft zone. Groundwater mineralization values are 59 900 mg/dm³ (No. 9), 24 400 mg/dm³ (No. 11), and 3 519 mg/dm³ (No. 10), respectively. A powerful source of groundwater contamination is tailing dumps No. 1 and No. 4. The influence of these dumps on aquifer salinization is observed in wells No. 16 and, likely, No. 65, with mineralization values of 17 849 mg/dm³ and 29 211 mg/dm³, respectively. Overall, it was found that elevated mineralization values are observed in a group of wells located within the direct impact zone of surface technogenic reservoirs.
Keywords: Kalush–Holynsky potash salt deposit, aquifer in Holocene and Upper Neopleistocene alluvial deposits, saline contamination.
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