Abstract
Results of the studies of water-rock interactions for the Bang thermal water system (Bang Mineral Hot Spring) in Kuang Binh province, Central Vietnam, are presented for the first time. It was established that the thermal waters (62.1-97.1 °C) with total mineralization of 255-659 mg/dm3 of HCO3-Na composition are supersaturated with respect to carbonate minerals (calcite, magnesite, and dolomite) and saturated with respect to albite, microcline, laumontite, and glaucophane. The waters with the outlet temperature of 24.3-34.5 °C, with mineralization 44-87 mg/dm3 and composition HCO3-Cl-Na-Mg are unsaturated with respect to carbonates and are in the fields of stability of clay minerals: kaolinite, illite, Na-, Ca-, and Mg-montmorillonite. Theseresults are in good agreement with the results of the isotope composition analysis of the hydrothermal vents (δD, δ18O and 3H), according to which the time of water circulation for the first-group is higher than 60 years and may reach more than 1000 years, while for the second-group water it does not exceed 50 years.
Highlights
Thermal waters of Vietnam have been investigated for several decades
In our previous studies [1,2, 4] we considered hydrogeochemistry and the isotopic composition of thermal waters in Central Vietnam and, hydrothermal vents of the Bang thermal water deposit [3]
Two types of thermal waters have been identified within the Bang thermal waters system
Summary
Thermal waters of Vietnam have been investigated for several decades. Many aspects related to the formation of the chemical and isotopic composition of thermal waters still remain unclear. In our previous studies [1,2, 4] we considered hydrogeochemistry and the isotopic composition of thermal waters in Central Vietnam and, hydrothermal vents of the Bang thermal water deposit [3]. This paper aims to address equilibrium speciation for the thermal waters - rock system
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