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Hydrochemistry and Noble Gas Origin of Various Hot Spring Waters from the Eastern area in South Korea  

Jeong, Chan-Ho (Department of Geotechnical Design Engineering, Daejeon University)
Nagao, Keisuke (Laboratory for Earthquake of Chemistry, Graduate School of Science, University)
Kim, Kyu-Han (Department of Science Education, Ehwa Woman University)
Choi, Hun-Kong (Department of Science Education, Ehwa Woman University)
Sumino, Hirochika (Laboratory for Earthquake of Chemistry, Graduate School of Science, University)
Park, Ji-Sun (Laboratory for Earthquake of Chemistry, Graduate School of Science, University)
Park, Chung-Hwa (Department of Geotechnical Design Engineering, Daejeon University)
Lee, Jong-Ig (Korea Polar Research Institute, Korea Ocean Research & Development Institute)
Hur, Soon-Do (Korea Polar Research Institute, Korea Ocean Research & Development Institute)
Publication Information
Journal of Soil and Groundwater Environment / v.13, no.1, 2008 , pp. 1-12 More about this Journal
Abstract
The purpose of this study is to characterize the hydrogeochemical characteristics of hot spring waters and to interpret the source of noble gases and the geochemical environment of the hot spring waters distributed along the eastern area of the Korean peninsula. For this purpose, We carried out the chemical, stable isotopic and noble gas isotopic analyses for eleven hot spring water and fourteen hot spring gas samples collected from six hot spring sites. The hot spring waters except the Osaek hot spring water show the pH range of 7.0 to 9.1. However, the Osaek $CO_2$-rich hot spring water shows a weak acid of pH 5.7. The temperature of hot spring waters in the study area ranges from $25.7^{\circ}C$ to $68.3^{\circ}C$. Electrical conductivity of hot spring waters varies widely from 202 to $7,130{\mu}S/cm$. High electrical conductivity (av., $3,890{\mu}S/sm$) by high Na and Cl contents of the Haeundae and the Dongrae hot spring waters indicates that the hot spring waters were mixed with seawater in the subsurface thermal system. The type of hot springs in the viewpoint of dissolved components can be grouped into three types: (1) alkaline Na-$HCO_3$ type including sulfur gas of the Osaek, Baekam, Dukgu and Chuksan hot springs, and (2) saline Na-Cl type of the Haeundae and Dongrae hot springs, and (3) weak acid $CO_2$-rich Na-$HCO_3$ type of Osaek hot spring. Tritium ratios of the Haeundae and the Dongrae hot springs indicate different residence time in their aquifers of older water of $0.0{\sim}0.3$ TU and younger water of $5.9{\sim}8.8$ TU. The ${\delta}^{18}O$ and ${\delta}D$ values of hot spring waters indicate that they originate from the meteoric water, and that the values also reflect a latitude effect according to their locations. $^3He/^4He$ ratios of the hot spring waters except Osaek $CO_2$-rich hot spring water range from $0.1{\times}10^{-6}$ to $1.1{\times}10^{-6}$ which are plotted above the mixing line between air and crustal components. It means that the He gas in hot spring waters was originated mainly from atmosphere and crust sources, and partly from mantle sources. The Osaek $CO_2$-rich hot spring water shows $3.3{\times}10^{-6}$ in $^3He/^4He$ ratio that is 2.4 times higher than those of atmosphere. It provides clearly a helium source from the deep mantle. $^{40}Ar/^{36}Ar$ ratios of hot spring water are in the range of an atmosphere source.
Keywords
Hot spring water; Chemical composition; Helium gas; Mantle origin; Residence time;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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