E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||5|
|Section||Geological Evolution of Water-Rock System: Mechanisms, Processes, Factors, Stages. The Session Dedicated to Stepan Shvartsev’s Memory|
|Published online||07 June 2019|
Interaction of thermal waters with carbonate and aluminosilicate minerals: a case study of Bang mineral hot spring, Central Vietnam
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Laboratory of Hydrogeology of Sedimentary Basins of Siberia, 630090 Koptyug ave. 3, Novosibirsk, Russia
2 Novosibirsk State University, Geological and Geophysical Department, 630090 Pirogov str. 1, Novosibirsk, Russia
3 Institute of Geological Sciences, Vietnam Academy of Science and Technology (VAST), 84 Chua Lang, Dong Da, Hanoi, Vietnam
4 National Centre for Water Resources Planning and Investigation, 93/95 Vu Xuan Thieu Street, Sai Dong Ward, Long Bien District, Hanoi, Vietnam
* Corresponding author: NovikovDA@ipgg.sbras.ru
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.
© The Authors, published by EDP Sciences, 2019
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