Fluid Inclusion Study of Skarns in the Maruyama Deposit, the Kamioka Mine, Central Japan |
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| Authors: | Naoto TAKENO Takayuki SAWAKI Hiroyasu MURAKAMI Kazuhiro MIYAKE |
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| Institution: | Geological Survey of Japan, Tsukuba, Ibaraki 305–8567, Japan;Metal Mining Agency of Japan, Toranomon 1, Minato–ku, Tokyo 105–0001, Japan |
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| Abstract: | Abstract: Fluid inclusions in skarn minerals in the Maruyama deposit, the Kamioka mine, central Japan were studied. Homogenization temperatures (Th) of fluid inclusions in 48 skarn minerals (hedenbergite, andradite, epidote and quartz) were measured, and gas composition of fluid inclusions in 12 skarn minerals was measured with a quadrupole mass spectrometer. The maximum Th value of primary inclusions in hedenbergite is 380C with peaks around 360C. Primary inclusions in hedenbergite near contact between skarn and limestone have slightly lower Th values and their distribution has a tendency of long trail skirt toward low temperature, which indicates ceasing of skarnization coincides with temperature decrease. Fluid inclusions in andradite and quartz in the hedenbergite skarn have lower Th values, in this order, than those in hedenbergite. CH4–detected fluid inclusions are localized around the Maruyama fault. Gas composition of the fluid inclusions indicates that fluid trapped in the hedenbergite has CO2 content less than 1 mole % and is not in equilibrium with graphite. |
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| Keywords: | Kamioka mine fluid inclusion graphite gas chemistry skarn Maruyama deposit |
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