“…The petrology of Ichinomegata peridotite xenoliths has been studied by several researchers (Kuno 1967;Aoki 1971;Takahashi 1978Takahashi , 1980Takahashi , 1986Abe et al 1992Abe et al , 1998. While a short reports exist on the CO 2 /H 2 O ratios of the fluid inclusions (Trial et al 1984;Yamamoto et al 2012), the chemical composition and origin of the fluids remain to be fully investigated.…”