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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Origin of some gases from the Takinoue geothermal area in Japan

Yasuhiro Kiyosu, Yutaka Yoshida
Geochemical Journal, Vol. 22, No. 5, P. 183-193, 1988


Chemical and isotopic compositions were analyzed on geothermal steam from fumaroles and wells in the Takinoue geothermal area. The distribution of deuterium and oxygen-18 in water samples suggests that the fumarole steam discharge is formed from the rising geothermal fluid through a single-step steam separation process at temperatures of approximately 150∼240°C. On the basis of N2/Ar, He/Ar and CO2/N2 ratios, and δ13C values of carbon dioxide in steam, it is concluded that the gas components dissolved in the Takinoue geothermal waters are mixtures of magmatic gases and meteoric waters.

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