Abstract
Three types of fluid inclusion assemblage (FIA) are recognized in a quartz vein intercalated with a metapelite collected from Besshi area. Garnet of the host metamorphic rock includes chloritoid and talc, which suggests it suffered nearly eclogite facies metamorphism. FIA-I and II are arranged at intragrain planes, suggesting that they are trapped before higher-T conditions. FIA-I consists of aqueous fluid and CH4 gas. Some inclusions of FIA-I show annular shape, suggesting they suffered nearly isothermal compression. FIA-II consitsts of CH4+N2+CO2+H2 gas inclusions. FIA-III, which shows transgrain plane, consists of CH4+N2 gas and aqueous fluid. Those facts suggests that three stage fluid activities (aqueous > anhydrous > aqueous) occurred during the Sambagawa metamorphism.
