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Skarns of the Kamioka mine (Tochibora and Maruyama deposits) are studied with special reference on the occurrence of garnet skarn. Skarn garnet of the Kamioka mine has been, so far, classified into two types; M-garnet that is skarn mineral of M-skarn mineralized during the migmatitization of Hida metamorphism and H-garnet that is alteration product of hedenbergite skarn disseminating sphalerite and galena (called "Mokuji ore"). Besides these two types of garnet, garnet is observed to make garnet skarn zone associated with hedenbergite skarn, and called E-garnet in this paper.<BR>E-garnet associates with epidote and quartz in garnet skarn, and its original rock is Inishi migmatite or M-skarn, then it is important to discriminate it from relict M-garnet that remained in epidote skarn. E-garnet is characterized by higher iron content than M-garnet.<BR>Garnet skarn composed of E-garnet is mainly distributed in the NE-SW direction along the Shikama valley between Tochibora and Maruyama deposits. Depositional condition of garnet skarn is estimated as temperature 450-320°C and X<SUB>CO2</SUB> less than 0.1 by phisicochemical consideration.
資源地質学会の論文