Dissolved gas composition of groundwater in the natural spa complex "Choygan mineral waters" (East Tuva)

Kopylova, Yu. G.; Гусева, Наталья Владимировна; Shestakova, Anastasia; Khvaschevskaya, Albina; Аракчаа, К. Д.

doi:10.1088/1755-1315/21/1/012022

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…Located in the Eastern Sayan Mountains, Tuva, Russia, some of these springs are characterized by the bubbling of CO 2 -rich gases. Our group [26,27] have determined the dissolved gas [26], 222 Rn [26] and major and trace chemical compositions of these waters [28,29] (see also previous work summarized in [26,27] as well as making an assessment of the extent of thermodynamic equilibrium of these waters with various minerals [26]). These have enabled preliminary estimates of reservoir temperatures [30,31].…”

Section: Introductionmentioning

confidence: 99%

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Shestakova

Гусева

Kopylova

et al. 2018

Water

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The Choygan area of southern Siberia, Russia hosts a variety of CO 2-rich thermal mineral and other waters emerging from springs at temperatures between 7 • C and 39 • C. Chemical analyses of the spring waters (n = 33) were carried out to characterise the waters and determine their origin. A continuum of compositions was observed between relatively lower temperature (7 • C) HCO 3-Ca-Na dominated waters with relatively low amount of total dissolved solids (TDS) and high Eh, and higher temperature (39 • C) HCO 3-Na-Ca dominated waters with higher TDS and lower Eh-this reflects largely conservative mixing of these components between near surface low temperature, oxidising groundwaters and higher temperature, more reducing thermal waters derived from a deeper geothermal reservoir. Stable isotopic data are consistent with all the water ultimately being derived from meteoric water that has undergone varying degrees of isotopic fractionation following evaporation. The inferred δ 18 O and δ 2 H isotopic composition of the unfractionationed meteoric waters is lighter than that expected that of mean annual local precipitation, which together with a strong negative correlation between δ 18 O and the elevation of the sampled discharging springs, suggests recharge at higher elevations (1600 m to 3000 m; average 2600 m). Reservoir temperature, calculated using geothermometers and an analysis of saturation indices of plausible reservoir minerals, ranged from 70 • C to 100 • C at an inferred depth of 2 to 3 km. Not all chemical components were found to follow conservative mixing behaviour. In particular, (i) the CO 2 contents of the waters were highly variable, suggesting either varying degrees of degassing and/or near discharge admixture with air, and (ii) SO 4 concentrations in the lower temperature thermal CO 2-rich waters were highly variable, suggesting a role of near surface oxidation processes, for example of pyrite, in modifying the concentration of redox sensitive components. Limited δ 13 C data are consistent with the CO 2 predominately being derived from dissolution of metamorphic/igneous carbonate minerals in the reservoir. Based on geological conditions, isotope and chemical data, a conceptual circulation model of the Choygan hydrothermal system is proposed.

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Section: Introductionmentioning

confidence: 99%

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Shestakova

Гусева

Kopylova

et al. 2018

Water

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Inter-annual variations in the chemical and thermal properties of well waters from the volcanic hydrothermal areas: Usu Volcano, Hokkaido, Japan

Takano,

Aoyanagi,

Ichihashi

et al. 2024

Limnology

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Geochemistry of carbon dioxide mineral waters of the Choigan natural complex (northeastern Tuva)

Kopylova

Гусева

Аракчаа³

et al. 2014

Russian Geology and Geophysics

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The abundance of various chemical elements (including trace, rare-earth, and radioactive) in the carbon dioxide mineral waters of the Choigan complex has been investigated. Three groups of waters are recognized according to the geochemical conditions and chemical composition: groundwaters of regional-jointing zone with oxidizing conditions; CO 2 -enriched groundwaters of regional-jointing zone with oxidizing conditions; and groundwaters of fault zones with reducing conditions. It is shown that water-rock interaction intensified by high temperature and carbon dioxide action is the main process determining the chemical composition of groundwaters.

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Dissolved gas composition of groundwater in the natural spa complex "Choygan mineral waters" (East Tuva)

Cited by 4 publications

References 2 publications

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Inter-annual variations in the chemical and thermal properties of well waters from the volcanic hydrothermal areas: Usu Volcano, Hokkaido, Japan

Geochemistry of carbon dioxide mineral waters of the Choigan natural complex (northeastern Tuva)

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