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Hot Spring Geology and Water Chemistry Observed in the Eastern KantoRegion
GSJ, AIST Yoji SEKI

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The Gas Which is Included in Hot Spring Water½About Flammable Gas½
Ibaraki Onsen Kaihatsu Co., Ltd.

Yuu HORIKAWA, Tadashi TOBITA

Drilling Keisoku Co., Ltd.

Atsushi MIYATA

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172

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Study on the Natural Gas Resource of Dissolved-in-water Type Beneath
the Kanto Plain (Minami-Kanto Gas Field) : Outcome as Guidelines forDrilling of Hot Springs, Use of Deep-seated Geothermal Water, etc.
AIST, GREEN

T. SAWAKI, N. KANEKO, S. IGARI, T. MAEKAWA, S. TOKUHASHI
T. NAKAJIMA, M. TANAHASHI, S. SAKATA, S. MORITA

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Inhibitors for Preventing Calcium Carbonate Scales
Nittetsu mining consultants co., Ltd.

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174

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GSJ, AIST Masaaki TAKAHASHI
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Fluoride in Geothermal Waters in Korea
Groundwater Environment Research Group, Korea, Institute of Geoscience & Mineral Resources(KIGAM), Gi-Tak CHAE, Byoung-Woo YUM, Dong-Chan KOH, Kyung-Seok KO
Department of Earth and Environmental Sciences, Korea University Seong-Taek YUN

The purposes of this study are to introduce case studies for ﬂuoride in geothermal watersof Korea, dealt with relationship between the ﬂuoride concentration and geology as well as
the geochemical behavior of ﬂuoride in those waters. Fluoride ion in geothermal waters in175

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Korea may originate from weathering of granite and metamorphic rocks containing ﬂuorinerich minerals. Hydrogeochemical data (N-11) of geothermal waters has been collected fromspa areas of Korea. The Mann-Whitney U test is used for comparing ﬂuoride concentrationof each geological group. The order of the median ﬂuoride concentration with respect togeology is as follows : metamorphic rocks῍granite῍complex rocksvolcanic rocks῍sedimentary rocks. It can be concluded that the ﬂuoride concentration of geothermal waters andeven deep groundwater from the metamorphic rock, granite, and complex rock is higher thanthat from volcanic rocks and sedimentary rocks. The result of this study provides the clue toﬁnd geothermal water in deep environment of Korea.

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Fuel-alternative E#ect by Bath Use of Hot Springs in Japan
AIST, Institute for Geo-Resources and Environment Hirofumi MURAOKA !"#$%&'( )*+*%,-./012  3456789:;<=< >>& )*+*?@(ABC,-./0D D)*+*E(>4?@F;AB9:( )GHDIJ%KLM +/NO IJP%)*QRS .,,-./0 4VWX Y%,-./0ZD[\]?^VX;_( .,4 .,.,

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