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Yasue, Kenichi; Komatsu, Tetsuya; Tokuyasu, Kayoko; Tamura, Itoko; Horiuchi, Yasuharu
no journal, ,
no abstracts in English
Niwa, Masakazu; Shimada, Koji; Sueoka, Shigeru; Tamura, Hajimu; Shibata, Kenji
no journal, ,
X-ray diffraction analysis and K-Ar dating were applied for fault gouges in the late Cretaceous Kojaku Granite, Tsuruga Peninsula. The fault gouge includes smectite, 1M
type illite, and kaolinite, based on the X-ray diffraction analysis. The K-Ar dating shows approximately 39 to 45 Ma for the 
0.1 
m size fractions separated from the gouges. The K-Ar ages and the reconstructed cooling history of the granite suggest that the 1M illite was formed at 60 to 110 
C (approximately 2 to 4 km in depth for 30 C/km of geothermal gradient).
Nohara, Tsuyoshi; Sakai, Toshihiro; Ishibashi, Masayuki; Matsumoto, Jun*
no journal, ,
Data analysis about the distribution of the high-angle fault (Main-shaft fault) and the water permeability in the granite was performed in MIU. We recognized wide range of strike of a fault and that the spray fault and the fault crowd are observed in a shallow depth in the tunnel scale. I could think fault and altered-zone distributed successively, and formed a low permeable zone.
Hoshi, Hiroyuki*; Tamura, Itoko; Komatsu, Tetsuya
no journal, ,
no abstracts in English
Sasao, Eiji; Yuguchi, Takashi*
no journal, ,
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.
Umeda, Koji; Asamori, Koichi
no journal, ,
no abstracts in English
Sueoka, Shigeru; Shimada, Koji; Ishimaru, Tsuneari; Niwa, Masakazu; Yasue, Kenichi; Umeda, Koji; Danhara, Toru*; Iwano, Hideki*
no journal, ,
no abstracts in English
Fukuda, Shoma*; Sueoka, Shigeru; Tagami, Takahiro*
no journal, ,
no abstracts in English
Shimizu, Mayuko; Niwa, Masakazu; Aoki, Kazuhiro; Kametaka, Masao*
no journal, ,
no abstracts in English
Yasue, Kenichi; Sugai, Toshihiko*; Tokuyasu, Kayoko; Komatsu, Tetsuya; Horiuchi, Yasuharu; Shimizu, Hitoshi*; Morita, Yasuhiko*
no journal, ,
no abstracts in English
Niizato, Tadafumi; Abe, Hironobu; Ishii, Yasuo; Sasaki, Yoshito; Mitachi, Katsuaki; Kitamura, Akihiro; Yamaguchi, Masaaki
no journal, ,
The depth profile of radiocaesium at the mountain forest of Abukuma Mountains, Fukushima Prefecture, shows the decreasing tendency of the radiocaesium inventory in the most upper part of the soil layer at ridge and valley bottom. A very slightly downward infiltration of the radiocaesium was found with decreasing of the inventory near the ground surface but most of the radiocaesium still exist in the upper part of the soil layer. Outflow of the radiocaesium from the mountain forest get to decrease due to the downward infiltration of the radiocaesium in the soil horizon by the application of the SACT model developed in JAEA.
Suzuki, Yuji*; Kametaka, Masao*; Murata, Seiichi*; Aoki, Kazuhiro; Tanaka, Yoshihiro; Seshimo, Kazuyoshi; Sakai, Toru*
no journal, ,
no abstracts in English
Sakai, Toru*; Kametaka, Masao*; Tanaka, Yumiko*; Aoki, Kazuhiro; Tanaka, Yoshihiro; Niwa, Masakazu; Seshimo, Kazuyoshi
no journal, ,
no abstracts in English