Japan Geoscience Union Meeting 2014

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Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-HW Hydrology & Water Environment

[A-HW25_2AM2] Isotope Hydrology 2014

Fri. May 2, 2014 11:00 AM - 12:45 PM 414 (4F)

Convener:*Masaya Yasuhara(Geological Survey of Japan, AIST), Kohei Kazahaya(Geological Survey of Japan, AIST), Shinji Ohsawa(Institute for Geothermal Sciences, Graduate School of Science, Kyoto University), Masaaki Takahashi(Geological Survey of Japan (GSJ), National Institute of Advanced Industrial Science and Technology (AIST)), YUICHI SUZUKI(Faculty of Geo-Environmental Sience,Rissho University), Futaba Kazama(Social Cystem Engineering, Division of Engineering, Interdiciplinary Graduate School of Medical and Engineering, University of Yamanashi), Kazuyoshi Asai(Geo Science Laboratory), Chair:Kazuyoshi Asai(Geo Science Laboratory), Kazuhiro Amita(Department of Earth Science & Technology Faculty of Engineering and Resource Science Akita University)

12:15 PM - 12:30 PM

[AHW25-13] Geochemical study of hot spring waters and gases in Jozankei area, Hokkaido, northern Japan

*Masaaki TAKAHASHI1, Kohei KAZAHAYA1, Munetake SASAKI1, Noritoshi MORIKAWA1, Hiroshi TAKAHASHI1 (1.Geological Survey of Japan, AIST)

Keywords:Jozankei, magmatic fluid, hydrogen and oxygen isotopic ratio

Jozankei hot spring area is located in the western part of Sapporo city, Hokkaido, northern Japan. In this area, hot spring waters >85 degree C. are springing out from the entire Toyohira river volley. Total discharge rate of hot spring waters is about 10 tons/min and the "heat energy index" is rank V (Fukutomi, 1965). Hydrogen and oxygen isotopic study clarified that the major origin of hot spring water is local meteoric water (Matsubaya et al., 1978)To understand the other origin of Jozankei hot spring, analyses of chemical compositions, hydrogen and oxygen isotope ratios were carried out for hot spring waters from Jozankei area and its adjacent area. From the good correlation among chloride ion content, oxygen and hydrogen isotope ratio of hot spring waters in Jozankei area, it is clarified that one of the end member of hot spring waters of Jozankei area is originated from magmatic fluid and chemical composition of magmatic fluid is 3-5 NaCl wt%.(References) Fukutomi(1961)J.Fac.Sci.Hokkaido Univ.Ser.VII, 315-330; Matsybaya et al.(1978)Papers of the Institute for Thermal Spring Research, Okayama Univ., 47, 55-67.