Relationship between fracture frequency and cooling history on the basis of thermochronological and petrographic studies at the Toki Granite, central Japan

Sasao, Eiji   ; Yuguchi, Takashi*

Fractures in the crystalline rock can act as groundwater pathways. Therefore, understanding of the fracture characteristics (e.g. frequency distribution and infilling minerals) is an important subject for the disposal of high-level nuclear waste. Geological setting and formation process of the granite can influence the fracture characteristics. Thus, this study discuss the relation between cooling process of granite and fracture frequency in the Toki granite, Tono district, central Japan, based on the thermochronological and petrographic studies.