The Fragmentation and alteration history of fault rocks in the Byobuyama fault, Gifu prefecture, central Japan

Katori, Takuma*; Kobayashi, Kenta*; Yasue, Kenichi; Niwa, Masakazu   ; Komatsu, Tetsuya  ; Hosoya, Takashi*; Sasao, Eiji   

Understanding fault zone evolution is important for constructing the topographical and geological model for a time scale more than one million year. We analyzed fault rocks of the Byobuyama fault in Tono area by several methods including structural analysis in the field and using optical microscope, determination of mineral composition based on X-ray diffraction analysis, and chemical composition analysis using an X-ray fluorescence instrument. Based on these analyses, studied fault rocks could record several stages of fault activity under different depths and stress regimes.