Microthermometric Evidence for the Formation of Ca-rich Hypersaline Brine and CO2–rich Fluid in the Mori Geothermal Reservoir, Japan |
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| Authors: | Yoichi MURAMATSU Ryo KOMATSU † |
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| Institution: | Department of Liberal Arts, Faculty of Science and Technology, Science University of Tokyo, Noda, Chiba 278–8510, Japan [e-mail: ];Exploration Department, JMC Geothermal Engineering Co., Ltd., Ukai, Takizawa–mura, Iwate 020–0172, Japan |
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| Abstract: | Abstract: Fluid inclusions in hydrothermal quartz and anhydrite samples from the Mori geothermal field, southwest Hokkaido, have been studied microthermometrically using heating/freezing stages. Based on homogenization temperatures of fluid inclusions, salinities after correction of effect of freezing-point depression of CO2 on ice melting temperatures of fluid inclusions, and previous geochemical data by Yoshida (1991), we discuss the geneses of various types of inclusion fluids in the Mori geothermal reservoir. |
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| Keywords: | fluid inclusion Mori geothermal field microther–mometry Ca–rich hypersaline brine CO2–rich fluid genesis boiling condition |
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