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Journal Articles

Characterization of water conducting fracture and their long-term behavior in deep crystalline rock; A Case study of the Toki granite

Ishibashi, Masayuki; Ando, Tomomi*; Sasao, Eiji; Yuguchi, Takashi; Nishimoto, Shoji*; Yoshida, Hidekazu*

Oyo Chishitsu, 55(4), p.156 - 165, 2014/10

Understanding of long-term history of water-conducting features such as flow-path fractures is key issue to evaluate deep geological environment for geological disposal of high-level radioactive waste (HLW). Thus, we conducted study on the geological features and the long-term behavior of flow-path fractures based on the data obtained at -300m levels in the Mizunami Underground research laboratory (MIU), central Japan. Total 1670 fractures were mapped in underground gallery at the -300m levels. Flow-path fractures occupy about 11% of all fractures. The flow-path fractures are divided into grout filling fractures and low inflow-rate fractures. All of the grout filling fractures is filled with calcite as fracture filling minerals without conspicuous host rock alteration around fractures. The low inflow-rate fractures possessed similar geological character with the sealed fractures which are not acted as flow-path. The geological character of fracture filling and host tock alteration around fractures indicates the history of the formation at the time of intrusion and emplacement of host granite (Stage I), then filling at hydrothermal event (Stage II), and finally opening and elongation during exhumation stage (Stage III). In conclusion, the present flow-path fractures were formed by opening and/or elongation of pre-existed fractures, which were filled at the hydrothermal event, at the time of exhumation.

Journal Articles

Internal structures, deformation and alteration characteristics of an impermeable fault; A Case study of the Toki Granite in the Mizunami Underground Research Laboratory

Nakamata, Kiminori; Tsuruta, Tadahiko; Amano, Kenji; Nishimoto, Shoji*; Yoshida, Hidekazu*

Nihon Oyo Chishitsu Gakkai Heisei-19-Nendo Kenkyu Happyokai Koen Rombunshu, p.207 - 208, 2007/10

no abstracts in English

Oral presentation

Alteration characteristics of an impermeable fault and surrounding rock mass; A Case study of the Toki granite in the Mizunami Underground Research Laboratory

Tsuruta, Tadahiko; Ochi, Minoru; Yuguchi, Takashi; Tagami, Masahiko; Kakamu, Kazuhiko; Yoshida, Hidekazu*; Nishimoto, Shoji*; Nishiyama, Tadao*; Nakamata, Kiminori*

no journal, , 

no abstracts in English

Oral presentation

Characterization of flow-path fractures at the deep crystalline rock

Ishibashi, Masayuki; Tsuruta, Tadahiko; Yuguchi, Takashi; Nishimoto, Shoji*; Sasao, Eiji; Yoshida, Hidekazu*

no journal, , 

no abstracts in English

Oral presentation

Spherical concretion formation; Understandings and applications

Yoshida, Hidekazu*; Yamamoto, Koshi*; Maruyama, Ippei*; Asahara, Yoshihiro*; Minami, Masayo*; Sirono, Sinichi*; Hasegawa, Hitoshi*; Katsuta, Nagayoshi*; Nishimoto, Shoji*; Muramiya, Yusuke*; et al.

no journal, , 

no abstracts in English

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