Gas Measurement of Fluid Inclusions from the Hishikari Epithermal Gold Deposit, Southern Kyushu, Japan, Using Laser Raman Microprobe |
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| Authors: | Jiro Etoh Sachihiro Taguchi Eiji Izawa |
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| Institution: | Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University, Hakozaki, Fukuoka 812–8581, Japan [e-mail: ];Department of Earth System Science, Faculty of Sciences, Fukuoka University, Nanakuma, Fukuoka 814–0180, Japan |
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| Abstract: | Abstract. Laser Raman microprobe analysis was performed on the fluid inclusions from the Honko-Sanjin zone in the Hishikari epithermal gold deposit, southern Kyushu, Japan. Gas concentrations of fluid inclusions through the zone were below detection limits (e.g., 5 mmole/kg H2O for CO2), with an exception at shallow portion in which the CO2/N2 mole ratio was determined to be 5.3. Boiling of hydrothermal solutions probably separated gases from ore fluids at the deep portion of the deposit, and migration of gases to shallow portion resulted in CO2-rich steam-heated water and related acid alteration. |
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| Keywords: | Hishikari deposit fluid inclusions gas composition laser Raman microprobe boiling |
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