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Umeda, Koji; Ninomiya, Atsushi
no journal, ,
no abstracts in English
Kawamura, Makoto; Oi, Takao; Makino, Hitoshi; Ebashi, Takeshi; Kawachi, Susumu*
no journal, ,
no abstracts in English
Kitazawa, Toshiyuki; Shigeno, Kiyoyuki*; Koitabashi, Shigekazu*; Miyasaka, Seigo*; Niizato, Tadafumi; Hoyanagi, Koichi*
no journal, ,
no abstracts in English
Yamada, Kunimi; Takagi, Hideo*; Tagami, Takahiro*; Danhara, Toru*
no journal, ,
Taki pseudotachylyte first found along the MTL was formed after mylonitization of the Hatai Tonalite under amphibolite to greenschist facies conditions, and had been post-dated by cataclasis. We dated some zircons from the mylonited Tonalite around the pseudotachylyte using the (U-Th)/He method, the age corresponds approximately to the FT ages of the pseudotachylyte, not the Tonalite. This suggests that the ambient temperature for generating the pseudotachylyte was higher than the closure temperature of ZHe, and this is consistent with cataclasis temperature. In this case we can not say the age of the pseudotachylyte, however, we can constrain something for the age and cooling-denudation history of this fault. Now we continue to date zircons from the pseudotachylyte.
gas emission due to fault activity; Approach to rock fracture and blast experimentsKurosawa, Hideki; Ishimaru, Tsuneari; Niwa, Masakazu; Shimada, Koji
no journal, ,
no abstracts in English
Tokiwa, Tetsuya; Ishii, Eiichi; Funaki, Hironori
no journal, ,
none
Ishii, Eiichi; Funaki, Hironori
no journal, ,
no abstracts in English
Niizato, Tadafumi
no journal, ,
Based on the geological history in and around the Horonobe area, northern Hokkaido, simulations of groundwater flow and spatial distribution of groundwater salinity in a 2D section were carried out in the past 700,000 years. The results shows that the total head distribution is sensitive but salt concentration of the groundwater is not sensitive to the natural phenomena, especially for the climate change (glacio-interglacial cycle). It is imply that a one of the buffering capacity of the deep geological environments.
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.