강화 석모도 지역 온천수와 지하수의 수리지구화학 및 동위원소 연구|RISS 상세보기

다국어 초록 (Multilingual Abstract)

The hydrochemical and isotopic (stable isotopes and noble gas isotopes) analyses for hot spring waters, cold groundwaters and surface water samples from the Seokmodo hot spring area of the Ganghwa province were carried out to characterize the hydrogeochemical characteristics of thermal waters and to interpret the source of thermal water and noble gases and the geochemical evolution of hot spring waters in the Seokmodo geothermal system. The hot spring waters and groundwaters show a weakly acidic condition with the pH values ranging from 6.42 to 6.77 and 6.01 to 7.71 respectively. The outflow temperature of the Seokmodo hot spring waters ranges from $43.3^{\circ}C\;to\;68.6^{\circ}C$. Relatively high values of the electrical conductivities which fall between 60,200 and $84,300{\mu}S/cm$ indicate that the hot spring waters were mixed with seawater in the subsurface geothermal system. The chemical compositions of the Seokmodo hot spring waters are characterized by Na-Ca-Cl water type. On the other hand, cold groundwaters and surface waters can be grouped into three types such as the Na(Ca)-$HCO_3$, Na(Ca)-$SO_4$ and Ca-$HCO_3$ types. The ${\delta}^{18}O\;and\;{\delta}D$ values of hot spring waters vary from -4.41 to -4.47%o and -32.0 to -33.5%o, respectively. Cold groundwaters range from -7.07 to -8.55%o in ${\delta}^{18}O$ and from -50.24 to -59.6%o in ${\delta}D$. The oxygen and hydrogen isotopic data indicate that the hot spring waters were originated from the local meteoric water source. The enrichments of heavy isotopes ($^{18}O\;and\;^2H$) in the Seokmodo hot spring waters imply that the thermal water was derived from the diffusion Bone between fresh and salt waters. The ${\delta}^{34}S$ values ranging from 23.1 to 23.5%o of dissolved sulfate are very close to the value of sea water sulfate of ${\delta}^{34}$S=20.2%o in this area, indicating the origin of sulfate in hot springs from sea water. The $^3H/^4He$ ratio of hot spring waters varies from $1.243{\times}10^{-6}\;to\;1.299{\times}10^{-6}cm^3STP/g$, which suggests that He gas in hot spring waters was partly originated from a mantle source. Argon isotopic ratio $(^{40}Ar/^{36}Ar=298{\times}10^{-6}cm^3STP/g)$ in hot spring waters corresponds to the atmospheric value.

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참고문헌 (Reference)

1 성규열, "부산지역 지열수의 기원과 진화: I. 가열된 해수-암석 반응과 지하수의 흔입에 따른 희석과 냉각" 대한자원환경지질학회 34 (34): 447-460, 2001

2 고용원, "부곡 지열수의 심부환경과 지화학적 진화: 유황형 지열수의 생성과정 재해석" 대한자원환경지질학회 34 (34): 329-343, 2001

3 이승구, "강화 석모도 화강암류와 온천수의 지구화학: 온천수의 기원규명을 위한 Sr 동위원소의 응용" 한국암석학회 15 (15): 60-71, 2006

4 Park, S. S., "Temperature evaluation of the Bugok geothermal system, South Korea" 35 : 448-469, 2006

5 Matsuda, J., "Purely physical separation of a small fraction of the Allende meteorite highly enriched in noble gases" 34 : 129-136, 1999

6 Shim, U. J., "Petrological study on granitic bodies in the Seokmoto and southern part of the Kanghwado" Yonsei University 1990

7 Nagao, K., "Noble gases and K-Ar ages of five Rumuruti chondrites Yamato(Y)-75302, Y-791827, Y-793575, Y-82002, and Asuka-881988" 12 : 81-93, 1999

8 Aka, F. T., "Noble gas isotopic compositions and water/gas chemistry of soda springs from the island of Bioko, So Tom and Annobon, along with Cameroon volcanic line, West Africa" 16 : 323-338, 2000

9 Park, J. S., "Noble gas geochemistry of hot spring waters and gases in Korean Peninsula. Proceedings of Annual Meeting Geol" 50-51, 2004

10 Kim, G. Y., "Mineralogy and geochemistry of carb onate precipitates from CO2-rich water in the Jungwon area" 13 : 22-36, 2000