JAEA
  • help
  • PC | SP
  • JP | EN
          
Refine your search：     
Report No.
 - 
Clear All
Search Results: Records 1-4 displayed on this page of 4
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

A Natural analogue of illitization of bentonite: A Contact metamorphism by the nishikubiki hypabyssal rock in niigata prefecture, Japan

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 $$^{circ}$$C during the 7.5$$times$$ 10$$^{5}$$ 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.

JAEA Reports

Natural analogue study on the long-term durability of bentonite; Time-temperature condition and water chemistry on illitization at the Murakami deposit

Kamei, Gento; Yusa, Yasuhisa; Sasaki, Noriaki

PNC TN8410 91-253, 8 Pages, 1992/01

PNC-TN8410-91-253.pdf:0.37MB

Time-temperature conditions and water chemistry on illitization at the Murakami deposit in central Japan were determined. The extent of the illitization and time-temperature condition estimated were as follows: the duration for conversion from 0 to 80% illite (volumetric ratio) was approximately 3.5 Ma in the temperature range from 340 to 100$$^{circ}$$C, Conversion from 0 to 40% requires approximately 3.0 Ma in the temperature range from 240 to 100$$^{circ}$$C, During 2.0Ma in the temperature range from 160 to 100$$^{circ}$$C, however, illite was scaroely observed, Water chemistry is estimated from two approaches, namely laboratory experiment and numerical analysis. The former is an interactive experiment between seawater and the tuff of the deposit. The latter is a calculation based on the difference of bulk composition between illitized and non-illitized tuff. The extent of each ionic concentration is inferred to be as follows: K$$^{+}$$; 560 to 6400, Mg$$^{2+}$$; 800 to 1700, Ca$$^{2+}$$; 360 to 2900, Na$$^{+}$$; 9400 to 15000 (mg/l).

JAEA Reports

A Carborne survey for the evaluation of diminution of terrestrial gamma ray due to snow cover

Sakamoto, Ryuichi; Nagaoka, Toshi; Saito, Kimiaki; Tsutsumi, Masahiro; Moriuchi, Shigeru

JAERI-M 91-166, 67 Pages, 1991/10

JAERI-M-91-166.pdf:2.13MB

no abstracts in English

JAEA Reports

Measurement of the reduction of terrestrial gamma-ray dose rates by the snow cover using TL-dosimeters

Sakamoto, Ryuichi; Saito, Kimiaki; Nagaoka, Toshi; Tsutsumi, Masahiro; Moriuchi, Shigeru

JAERI-M 90-217, 30 Pages, 1990/12

JAERI-M-90-217.pdf:0.88MB

no abstracts in English

4 (Records 1-4 displayed on this page)
  • 1