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Geochemical and Isotopic Compositions and Geothermometry of Thermal Waters in the Magumsan Area, South Korea
- Geochemical and Isotopic Compositions and Geothermometry of Thermal Waters in the Magumsan Area, South Korea
- Jeong, Chan-Ho; Lee, Byeong-Dae; Yang, Jae-Ha; Nagao, Keisuke; Kim, Kyu-Han; Ahn, Sang-Won; Lee, Yong-Cheon; Lee, Yu-Jin; Jang, Hyeon-Woo
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- WATER vol. 11, no. 9
- thermal waters; chemical composition; reservoir temperature; delta S-34; meteoric water; He-3/He-4 ratio; geothermometers; thermodynamic equilibrium
- SCIE; SCOPUS
- Document Type
- The Magumsan thermal waters of the southeastern Korean Peninsula are pumped out of six deep wells (average depth, 300 m) at temperatures of 30.8-49 degrees C. The thermal waters are chemically classified into two groups: NaHCO3 type (<31 degrees C) and NaCl (HCO3, SO4) type (>40 degrees C), both of which have chemical compositions that are distinct from local groundwater (Ca-HCO3 type). delta O-18 and delta D values suggest that the thermal waters originate from meteoric water and they are isotopically fractionated by silicate hydration or H2S exchange. delta S-34 values (+7.0 to +15%) of dissolved sulfate in the thermal waters reflect enrichment in S-34 through kinetically controlled oxidation of magmatic pyrite in the thermal aquifer and mixing with paleo-seawater. On the He-3/He-4 vs. He-4/Ne-20 diagram, the thermal waters plot along a single air mixing line of dominant crustal He, which indicates that the heat source for the thermal waters is non-volcanogenic thermal energy that is generated from the decay of radioactive elements in crustal rocks. Chalcedony geothermometry and thermodynamic equilibrium calculations using the PHREEQC program indicate a reservoir temperature for the immature thermal waters of 54-86 degrees C and 55-83 degrees C, respectively.
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