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Geochemical Significance of $^{14}C$ Age from the Dongrae Hot Spring Water  

Lee, Seung-Gu (Korea Institute of Geoscience and Mineral Resources)
Nakamura, Toshio (Center for Chronological Research, Nagoya University)
Kim, Tong-Kwon (Korea Institute of Geoscience and Mineral Resources)
Ohta, Tomoko (Center for Chronological Research, Nagoya University)
Kim, Hyoung-Chan (Korea Institute of Geoscience and Mineral Resources)
Lee, Tae-Jong (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.42, no.6, 2009 , pp. 541-548 More about this Journal
Abstract
The Dongrae thermal water area located at the southeastern marginal part of the Korean Peninsula is one of the oldest hot springs in Korea. The Dongrae thermal water shows Na-Cl type of water chemistry, whereas the shallow cold groundwater is Ca(-Na)-$HCO_3$ type. In this paper, we discuss the age of the Dongrae hot spring, i.e. groundwater cycle among meteoric water-surface water-shallow groundwater-hot spring water. The $^{87}Sr/^{86}Sr$ ratios of the thermal water in Dongrae area range from 0.705663 to 0.705688 and are lower than those of groundwater, surface water and rain water as well as aquifer bearing granite. These Sr isotopic signatures in the Dongrae thermal water indicate that the circulation rate between thermal water and current meteoric water including groundwater, surface water and rain water in the Dongrae area should be very slow. The $^{14}C$ age of the Dongrae hot spring water range from $1,271{\pm}36$ BP(before present) to $2,467{\pm}36$ BP whereas that of the shallow groundwater is $-495{\pm}33$ BP. This suggests that the period of groundwater cycle among meteoric water, surface water, shallow groundwater and hot spring should be more than 1,270 years. Then, it also indicates that the present Dongrae hot spring may be a mixed water between the old thermal water heated for at least 1,270 years and the present shallow cold groundwater.
Keywords
Dongrae hot spring; $^{14}C$ isotope; water cycle;
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Times Cited By KSCI : 4  (Citation Analysis)
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