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Futakuchi, Katsuhito*; Hiroki, Minenari*; Sakuramoto, Yuji*
JNC TJ8400 2004-010, 33 Pages, 2004/02
JNC-TJ8400-2004-010.pdf:7.57MB
The alteration characteristics of volcanic glass in geological medium are investigated as natural analogues of geological disposal of high-level radioactive wastes. This study leads to the following conclusion. The activation energy was calculated for changes from volcanic glasses to clinoptilolite is 176.27KJ/mol.
Futakuchi, Katsuhito*; Sakuramoto, Yuji*; Hiroki, Minenari*
JNC TJ8400 2003-006, 50 Pages, 2003/01
JNC-TJ8400-2003-006.pdf:10.85MB
The alteration characteristics of volcanic glass and bentonite in geological medium are investigated as natural analogues of geological disposal of high-level radioactive wastes. For the study of alterlation of volcanic glass, literature survey, petrographical observation by using optical microscope, chemical analysis of pore water and groundwater, and microbiostratigraphical study were carried out. The volcanic ashes were collected from a borehole, which had been drilled in the Kanto region by the National Research Institute for Earth Science and Disaster Prevention. The volcanic glass was wholly altered in thin sections. Chemical analysis of pore water indicate the chloride-rich composition. And chemical analysis of groundwater, which are pumped up near the studied borehole, indicate the mixing product of connate marine water and fresh groundwater. Fossil evidence suggests that the studied volcanic glass is 3.65
4.2Ma. in age, and is correlated with upper Miura Group. This study leads to the following conclusion. The volcanic glass, under the temperature condition 70
C, was wholly altered to montomorillonite and clinoptilolite. This case must be occurred in the connate marine water at last 0.5 Ma..
Kamei, Gento; ; Sakuramoto, Yuji*
Abstract, p.195, 195 Pages, 2003/00
None
Futakuchi, Katsuhito*; Sakuramoto, Yuji*; Hiroki, Minenari*
JNC TJ8400 2001-046, 61 Pages, 2002/02
JNC-TJ8400-2001-046.pdf:2.45MB
The alteration characteristics of volcanic glass and bentonite in geological medium are investigated as natural analogues of geological disposal of high-level radioactive wastes. For the study of volcanic glass, volcanic ashes are collected from boreholes, which were drilled in the Kanto region by the National Research Institute for Earth Science and Disaster Prevention. The volcanic glass, under the temperature condition 70C, was altered to montomorillonite and clinoptilolite, but another volcanic glass, under the temperature condition up to 50C, was not altered. Both cases may be occurred in the connate marine water at last 0.5 Ma For the study of bentonite, slight alkaline hot spring water (pH: up to 9) and rocks in Rausu area, Hokkaido Prefecture, have been studied to examine the zeolitization of montmorillonite. X-ray diffraction analysis show that montmorillonite, kaolinite, mordenite, and alunite were recognized as the alteration minerals. Alkaline (pH:up to 9) and high temperature (about 90C) water (Na
- Cl
type) were found at several outcrops, chemical and isotopic analysis show that those alkali hot spring waters were meteoric origin, increasing of salinity were as a result of seepage through the marine sedimentary strata, and high temperature was derived from the heat source. Stability relationship for system anorthite - kaolinite - montmorillonite - silica minerals - aqueous solution shows that montmorillonite was stable in those spring water.
Futakuchi, Katsuhito*; Hashimoto, Shuji*; Sakuramoto, Yuji*; ;
JNC TN8400 2001-007, 52 Pages, 2001/04
JNC-TN8400-2001-007.pdf:2.34MB
As a natural analogue, the authors investigted a Tertiary argillaceous bed and a Quarternary hypabyssal rock (porphyrite) which intruded into the argillaceous rock, distributed in the Nishikubiki district of Niigata prefecture in Japan. We examined the variation of clay mineral species in the argillaceous rock surrounding the intrusive rock and carried out thermal analyses for the argillaceous rock based on the coolig history of the intrusive rock. The predominant clay mineral varied from montmorillonite to illite through illite/montmorillonite interlayers with approaching to the intrusive rock. The thermal analyses indicated that the temperature descended from 270 to 15 C during the 7.5
10
years at alocalty of argillaceous rock containing 75% illite in the interlayers. On the assumption that the alteration from montmorillonite to illite was regarded as a first-order reaction, we evaluated the apparent activation energy based on the thermal condition mentioned above; about 103 kJ/mol was obtained for this illitization. This was within the range of values reported previously by laboratory experiments and/or examinations of natural illitizations.
Futakuchi, Katsuhito*; Sakuramoto, Yuji*; *; *; *; Hashimoto, Shuji*
PNC TJ1308 98-001, 103 Pages, 1998/02
None
Futakuchi, Katsuhito*; Sakuramoto, Yuji*; *; *; *
PNC TJ1308 97-001, 295 Pages, 1997/02
None
Futakuchi, Katsuhito*; Sakuramoto, Yuji*
PNC TJ1308 92-002, 40 Pages, 1992/02
None
Futakuchi, Katsuhito*; Sakuramoto, Yuji*
PNC TJ1308 92-001, 107 Pages, 1992/02
None
Yoneda, Shigeo*; Koyakaichi, Minoru*; Sakuramoto, Yuji*
PNC TJ7308 91-001VOL1, 119 Pages, 1991/03
PNC-TJ7308-91-001VOL1.pdf:3.08MB
no abstracts in English
*; Sakuramoto, Yuji*; Okazaki, Kazuhiko*
PNC TJ4308 89-001VOL1, 17 Pages, 1989/01
PNC-TJ4308-89-001VOL1.pdf:1.31MB
None
Takano, Hitoshi*; Sakuramoto, Yuji*; Okazaki, Kazuhiko*
JNC TJ1400 2005-013, 132 Pages, 1987/06
JNC-TJ1400-2005-013.pdf:8.43MB
The literature investigation and field survey done to get basic data to clarify the weathering characterristics of natureal glass from Japan as a study on geological disposal of highly radioactive waste.