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Bendo, A.*; Maeda, Tomoyoshi*; Matsuda, Kenji*; Lervik, A.*; Holmestad, R.*; Marioara, C. D.*; Nishimura, Katsuhiko*; Nunomura, Norio*; Toda, Hiroyuki*; Yamaguchi, Masatake; et al.
Philosophical Magazine, 99(21), p.2619 - 2635, 2019/07
Times Cited Count：26 Percentile：82.26(Materials Science, Multidisciplinary)Inagaki, Yaohiro*; Mitsui, Seiichiro*; Makino, Hitoshi*; Ishiguro, Katsuhiko*; Kamei, Gento*; Kawamura, Kazuhiro*; Maeda, Toshikatsu; Ueno, Kenichi*; Bamba, Tsunetaka*; Yui, Mikazu*
Genshiryoku Bakkuendo Kenkyu, 10(1-2), p.69 - 84, 2004/03
no abstracts in English
Inagaki, Yaohiro*; Mitsui, Seiichiro; Makino, Hitoshi; Ishiguro, Katsuhiko; Kamei, Gento; Kawamura, Kazuhiro; Maeda, Toshikatsu*
JNC TN8400 2003-036, 53 Pages, 2003/12
JNC-TN8400-2003-036.pdf:0.51MB
Obtain of sufficient data for the performance of high-level radioactive waste(HLW) glass and verification of a model for the radionuclide release from the HLW glass in the disposal condition are required in order to show the objective reliability. In this paper, some reports about performance assessment of HLW glass are reviewed and we clarify the problems to raise reliability comparing these reports.
Hanamuro, Takahiro; Umeda, Koji; Maeda, Katsuhiko*
no journal, ,
K-Ar dating, fission track (FT) dating, and thermoluminescence (TL) dating of altered samples are executed in order to understand the alteration age of geothermal activities in the southern part of Kii Peninsula. Besides, in order to understand the temperature and chemistry of hydrothermal solution, fluid inclusion analyses of altered minerals from the alteration zones around gushing out points of the hot springs and mineralization area, are executed. Results of dating, K-Ar age of sericite seems to show the forming age of sericite by high-temperature hydrothermal alteration, and the hydrothermal activities seem to have relation to the volcanic activities. Apatite FT age seems to show the reset age by burying after sedimentation (ca. 10 Ma) and the reset age by low-temperature geothermal activities at Tosenji and Yunomine (2.5
5 Ma). Results of fluid inclusion analyses, hydrothermal solution of middle to high temperature (
200 
C) and middle to high salinity (1 wt%NaCl) are identified. Moreover, at Heijigawa area, hydrothermal solution of low temperature (180 degree C) and low salinity (0.5 wt%NaCl) are identified, too. This hydrothermal solution of low temperature and low salinity is thought to be the same kind of the solution by the low-temperature geothermal activities at Tosenji and Yunomine.
Hanamuro, Takahiro; Umeda, Koji; Maeda, Katsuhiko*
no journal, ,
High temperature hot springs are distributed in the southern part of Kii Peninsula, though no Quaternary volcanoes exist in this area. Hongu area is known as an extraordinary geothermal area. Acidic volcanic rocks and several tens of vein-type ore deposits are distributed in this area. Hydrothermal solution of high temperature and high salinity are identified from fluid inclusion analyses at several mines and alteration zones with Cu-Zn-Pb mineralization. Hydrothermal solution of low temperature and low salinity are identified at Kamiyu area. The results of helium and neon gas isotope ratio in fluid inclusion and hot spring gas at Kamiyu and Tosenji area suggest the similar air-mantle-crust ratio.
Hanamuro, Takahiro; Umeda, Koji; Maeda, Katsuhiko*
no journal, ,
Although no evidence of volcanism during the Pliocene and Quaternary is known in the Kii Peninsula, it has long been recognized to be several hot springs with discharge temperatures higher than 60 C. On the other hand, several tens of small-scale vein-type metal deposits are distributed around the southern part of Kii Peninsula, whose heat source are thought to be Middle Miocene acidic magmatism associated with Kumano Acidic Rocks. The results of the dating of altered rocks from these hot spring area, ore deposits and their surroundings altered rocks show that high temperature hydrothermal alteration related to the acidic magmatism occurred in the Middle Miocene, and relatively low temperature alteration has been caused since the Pliocene in Hongu and Totsukawa area. Chemical and isotope data were obtained for fluid inclusions trapped in hydrothermal minerals in the peripheral parts of the high-temperature hot springs, and other vein-type ore deposits. The former inclusions have very low temperatures and low salinities. On the other hand, the latter inclusions are characterized by high temperature fluid with high salinity. The 
He/
He ratios of the former inclusions indicate relatively high values, generally in agreement with those of the present-day hydrothermal fluids, resulting in a significant contribution of deep source gases.
Hanamuro, Takahiro; Umeda, Koji; Maeda, Katsuhiko*
no journal, ,
no abstracts in English
Muramatsu, Toshiharu; Shobu, Takahisa; Sato, Katsuhiko*; Maeda, Junya*; Kan, Hirofumi*
no journal, ,
no abstracts in English
Sato, Katsuhiko*; Maeda, Junya*; Kan, Hirofumi*; Shobu, Takahisa; Muramatsu, Toshiharu
no journal, ,
no abstracts in English
