S2: Water Rock Interaction (Special Session)

[S2-01] Chloritization and porosity generation at crust-mantle material boundary

*Atsushi Okamoto¹, Oyanagi Ryosuke², Kazuki Yoshida¹ (1. Tohoku Univ. Env., 2. Kokushikan Univ.)

Keywords:Chloritization, porosity, Serpentinite, Sanbagawa belt, Mass transfer

Chloritization occurs in various geological settings, including the seafloor alteration and metasomatisms. In this study, we report a novel texture of chloritization of pelitic schists in contact with serpentinite from the Sanabagwa belt, Kanto Mountains. Chloritization proceeds with preserving the original structures of pelitic schists and micro-porosities were formed at the reaction fronts. We will discuss that mass transport and formation of porosity during chloritization.