Hydrogeochemistry of Carbonic Acid Water Manifestations in the Pogromka River Basin (Western Transbaikalia)

Given the abundance of manifestations of carbonic acid water in Transbaikalia, the information on their physical and chemical characteristics dates mainly to the middle of the last century and is mainly limited to data on macrocomponents. The aim of the study is to obtain modern data on chemical, microcomponent and isotopic composition, content of balneological components in carbonic acid spring, to determine the nature of water and carbon dioxide by isotopic data. Such data were obtained for the carbon dioxide spring Pogrominsky in the Yeravninsky district of the Republic of Buryatia and the first tested borehole located near it in August 2020. The spring water is HCO₃ Ca, the borehole — HCO₃ Na-Ca types with CO₂ content respectively 0.94 and 0.6 g/l and mineralization 0.79 and 0.65 g/l. According to the content of meta-silicic acid H₂SiO₃ (71.3 mg/l) and Fe (34.7 mg/l) the water of the borehole corresponds to the Kuka balneological type, it can be of interest for the organization of bottling. Mass-spectrometric method determined concentrations of 50 trace elements, of which uranium (83 µg/l) is found to be anomalously high in the spring water. According to isotopic data, water of both manifestations has infiltration genesis, carbon dioxide gas is metamorphogenic with the participation of biogenic.