Abstract—
The paper summarizes newly obtained data on the chemical and isotopic composition of groundwaters in the southern part of the Kuznetsk Basin. The territory is demonstrated to host groundwaters of three types, which were distinguished according to the chemical, isotopic, and gas composition of the waters. The waters of type 1 are widespread in areas of sluggish water exchange in coal-bearing terrigenous rocks, bear mineralization of 0.2–4.7 g/L, have pH 7–10, and N2–CH4 and CH4–N2 gas composition. Their source is biogenic (coal) with δ13C from –17.1 to –4.2‰. The sodic waters of type 2 were found relatively recently and only locally, are hosted in the same rocks but at more hampered water exchange, and have mineralization of 5–25 g/L, pH 7.7–10, and CH4 gas composition. These waters are noted for an anomalously isotopically heavy isotopic composition of their carbon δ13С(\({\text{HCO}}_{3}^{ - }\)) = 0.2–30.9‰ and δ13С(CO2) = –3.2–22.3‰. The source of their carbon is also biogenic, but long-lasting interaction in the water–coal system resulted in significant carbon fractionation, with isotopically lighter carbon fractionated into CH4 (δ13С = –67.3 to ‒43.3‰) and isotopically heavier one preferably coming to CO2. The waters of type 3 occur only at certain sites, for example, the Tersinskii CO2 waters. These waters have mineralization of 2–5.5 g/L, pH 6.2–6.7, and CO2 gas composition. Their δ13С(\({\text{HCO}}_{3}^{ - }\)) = –4.3 to –4.1‰ and δ13С(CO2) = –12.3 to –3.9‰ suggest a mixed source of their carbon. This source was mostly deep-seated, not genetically related to waters. All of the sodic waters belong to the infiltration type according to their δ18O and δD, with the waters of type 2 showing a positive oxygen shift. The sodic waters of all three types are shown not to be in equilibrium with many primary aluminosilicates but are oversaturated with respect to carbonates, montmorillonites, illite, chlorite, and sometimes even albite and microcline (waters of type 2). The waters of all of the three types were generated by the same mechanism: by dissolving aluminosilicate minerals in coal-bearing rocks (with which the waters are not in equilibrium) and the simultaneous precipitation of carbonates. The reasons for certain differences between the waters are their interaction with rocks and coal (waters of type 2), which increases their mineralization and makes their carbon and oxygen isotopic compositions heavier, or the addition of carbon dioxide from an external source (waters of type 3), which acidifies the waters.
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ACKNOWLEDGMENTS
The author thanks S.L. Shvartsev for consultations and E.V. Domrocheva for materials provided for this research. This study was financially supported by Russian Science Foundation (project no. 17-17-01158), the Russian Foundation for Basic Research, project no. 17-05-00042), and the Program of Fundamental Research of the Russian Academy of Science for 2013–2020 (project no. IX.131.3.3).
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Lepokurova, O.E. Sodic Groundwaters in the Southern Kuznetsk Basin: Isotopic and Chemical Characteristics and Genesis. Geochem. Int. 56, 934–949 (2018). https://doi.org/10.1134/S0016702918090069
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DOI: https://doi.org/10.1134/S0016702918090069