| Summary: | This article presents the new data on the chemical and gas composition, the content of stable isotopes of oxygen, hydrogen, carbon, and sulfur in natural mineral waters of the Essentuki field. A detailed study of the geological and hydrogeological features of the water circulation area, its major chemical composition, the content of organic matter in water, temperature conditions and δ<sup>18</sup>O<sub>SMOW</sub>, δD<sub>SMOW</sub>, δ<sup>13</sup>C<sub>DIC</sub>, δ<sup>18</sup>O<sub>DIC</sub>, δ<sup>34</sup>S<sub>VCDT</sub>, δ<sup>13</sup>C<sub>CO2</sub>, δ<sup>13</sup>C<sub>CH4</sub>, δ<sup>15</sup>N values made it possible to specify the genesis of water, gas, and solute components of the Essentuki CO<sub>2</sub>-rich mineral water field. The stable isotopes values (δ<sup>18</sup>O<sub>SMOW</sub> and δD<sub>SMOW</sub>) in the water phase ranges from −13.75 to −9.69‰ and from −101.08 to −74.34‰, respectively. They correspond to GMWL, which indicates their predominantly infiltration genesis. The values of δ<sup>13</sup>C<sub>DIC</sub> in mineral waters of the Essentuki field vary widely from −14.43 to +8.59‰ and indicate their mixed genesis. δ<sup>15</sup>N gas values in mineral waters of the Essentuki field vary quite widely from −2.31 to 2.50‰ indicating a different source of this gas. Obtained data prove that all mineral waters in the Essentuki field are infiltration waters, and the heterogeneous component composition of waters circulating in different aquifers reflects the lithological composition of water-bearing strata, the rate of openness/closure of faults and the intensity of reactions in the «water-rock-gas-organic matter» system.
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