Geochemical and Isotopic Compositions and Geothermometry of Thermal Waters in the Magumsan Area, South Korea
| Autor: | Kyu Han Kim, Sang-Won Ahn, Chan-Ho Jeong, Jae-Ha Yang, Keisuke Nagao, Yu Jin Lee, Yong-Cheon Lee, Byeong-Dae Lee, Hyeon-Woo Jang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences Chalcedony Geography Planning and Development Geochemistry δ34S Aquifer Aquatic Science engineering.material 010502 geochemistry & geophysics 01 natural sciences Biochemistry thermodynamic equilibrium chemistry.chemical_compound lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 chemical composition Sulfate 3He/4He ratio 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 geography geography.geographical_feature_category geothermometers Silicate reservoir temperature meteoric water chemistry Meteoric water engineering Environmental science Pyrite Groundwater thermal waters |
| Zdroj: | Water Volume 11 Issue 9 Water, Vol 11, Iss 9, p 1774 (2019) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w11091774 |
| Popis: | 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&ndash 49 ° C. The thermal waters are chemically classified into two groups: NaHCO3 type (< 31 ° C) and NaCl (HCO3, SO4) type (> 40 ° C), both of which have chemical compositions that are distinct from local groundwater (Ca&ndash HCO3 type). &delta 18O 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 34S values (+7.0 to +15%) of dissolved sulfate in the thermal waters reflect enrichment in 34S through kinetically controlled oxidation of magmatic pyrite in the thermal aquifer and mixing with paleo-seawater. On the 3He/4He vs. 4He/20Ne 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&ndash 86 ° C and 55&ndash 83 ° C, respectively. |
| Databáze: | OpenAIRE |
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