동해안지역 온천유형별 수리화학적 특성 및 영족기체 기원 (Hydrochemistry and Noble gas Origin of Various Hot Spring Waters from the Eastern area in South Korea)

서지정보

· 발행기관 : 한국지하수토양환경학회
· 수록지 정보 : 지하수토양환경 / 13권 / 1호 / 1 ~ 12페이지
· 저자명 : 정찬호, K. Nagao, 김규한, 최훈공, H. Sumino, 박지선, 박충화, 이종익, 허순도

초록

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 CO2-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℃ to 68.3℃. Electrical conductivity of hot spring waters varies widely from 202 to 7,130 μS/cm. High electrical conductivity (av., 3,890μS/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-HCO3 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 CO2-rich Na-HCO3 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∼0.3 TU and younger water of 5.9∼8.8 TU. The δ18O and δD 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 CO2-rich hot spring water range from 0.1× 10-6 to 1.1× 10-6which 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 CO2-rich hot spring water shows 3.3× 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. 40Ar/36Ar ratios of hot spring water are in the range of an atmosphere source.

영어초록

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 CO2-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℃ to 68.3℃. Electrical conductivity of hot spring waters varies widely from 202 to 7,130 μS/cm. High electrical conductivity (av., 3,890μS/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-HCO3 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 CO2-rich Na-HCO3 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∼0.3 TU and younger water of 5.9∼8.8 TU. The δ18O and δD 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 CO2-rich hot spring water range from 0.1× 10-6 to 1.1× 10-6which 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 CO2-rich hot spring water shows 3.3× 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. 40Ar/36Ar ratios of hot spring water are in the range of an atmosphere source.

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