Water-rock interaction recorded in the 'Hadeba mélange zone' of the Besshi area, Sanbagawa metamorphic belt, Japan

Abstract

In the 'Hadeba mélange zone' in the Besshi area, Sanbagawa metamorphic belt, tourmaline(Tur)-rich layer indicative of B-bearing fluid infiltration is observed in reaction zones between host metapelites and serpentinite- and marble-lenses. B-bearing fluid infiltrated after peak metamorphism and Ss schistosity formation. Ds deformation continued after it as indicated by E-W trending boudinage of the Tur. K-feldspar veins replacing Tur implies that alkaline fluid infiltration followed it.