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Geochemical and Isotopic Compositions and Geothermometry of Thermal Waters in the Magumsan Area, South Korea

Title
Geochemical and Isotopic Compositions and Geothermometry of Thermal Waters in the Magumsan Area, South Korea
Authors
Jeong, Chan-HoLee, Byeong-DaeYang, Jae-HaNagao, KeisukeKim, Kyu-HanAhn, Sang-WonLee, Yong-CheonLee, Yu-JinJang, Hyeon-Woo
Ewha Authors
김규한
SCOPUS Author ID
김규한scopusscopus
Issue Date
2019
Journal Title
WATER
ISSN
2073-4441JCR Link
Citation
WATER vol. 11, no. 9
Keywords
thermal waterschemical compositionreservoir temperaturedelta S-34meteoric waterHe-3/He-4 ratiogeothermometersthermodynamic equilibrium
Publisher
MDPI
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
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.
DOI
10.3390/w11091774
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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