Latest slip plane and mass transfer in the basement rock; An Example of the Atera fault

Otani, Tomoyuki*; Morikawa, Koichiro*; Kojima, Satoru*; Kakamu, Kazuhiko

no journal, , 

Mass transfer along the latest slip plane is examined by geological, petrological and geochemical studies in a fracture zone outcrop of the Atera Fault, which is displaced in 1586 Tensho Earthquake. Whole rock chemical composition shows that the sharp dark brownish gouge is remarkably Mn-rich compared to other gouges and host rocks. The fact indicates that Mn-oxides or -hydroxides were precipitated due to the latest slip along the dark brownish gouge.