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Estimation of Illitization Rate of Smectite from the Thermal History of Murakami Deposit, Japan

Published online by Cambridge University Press:  21 February 2011

G. Kamei ,
T. Arai ,
Y. Yusa ,
N. Sasaki  and
Y. Sakuramoto
G. Kamei
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319–11, JAPAN
T. Arai
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319–11, JAPAN
Y. Yusa
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319–11, JAPAN
N. Sasaki
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, Tokai-mura, Ibaraki-ken, 319–11, JAPAN
Y. Sakuramoto
Affiliation:
Dia Consultants Company, Toshima-ku Ikebukuro 3–1631, Tokyo, 171, JAPAN
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Abstract

The research on illitization of smectite in the natural environment affords information on the long-term durability of bentonite which is the candidate for buffer material.

Murakaml bentonite deposit in central Japan, where the bentonite and rhyolitic intrusive rock were distributed, was surveyed and the lateral variation of smectite to illite in the aureole of the rhyolite was studied.

The radiometric ages of some minerals from the intrusive rock and the clay deposit were determined. Comparison of the mineral ages ( obtained by K-Ar, Rb-Sr and fission-track methods ) with closure temperature estimated for the various isotopic systems allowed the thermal history of the area. The age of the intrusion was 7.1± 0.5 Ma(; Mega d'annees), and the cooling rate of the intrusive rock was estimated to be approximately 45 °C/Ma.

Sedimentation ages of the clay bed were mostly within the range from 18 to 14 Ma. However, the fission-track age of zircon in the clay containing illite/smectite mixed layers was 6.4±0.4 Ma, which was close to that of the intrusion. The latter value could be explained as the result of annealing of fission-tracks in zircon. The presence of annealing phenomena and the estimated cooling rate concluded that illitization had occured in the period of 3.4 Ma at least under the temperature range from above 240±50 to 105 °C. Illite-smectite mixed layers occured from smectite in the process. The proportion of iliite was about 40 %. Approximately, 29 kcal/mol as a value of activation energy was calculated to the illitization.

The hydrogen isotopic ratio ( D/H ) of constitution water of the illite was determined. The values that were calculated for the water, which was related to the illitization, fell within the range of hydrogen isotopic ratios of seawater.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 657
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Hurford, A.J., Contrib. Mineral. Petrol. 92, 113 (1986).Google Scholar
2. Muramatsu, T., in Regional Geology of Japan IV. CHUBU-I, edited by The Assoc. Geol. Collaboration (Kyoritsu Press, Tokyo, 1988) p.62.Google Scholar
3.Metal Mining Agency of Japan, in Regional Geological Survey Report, UETSU AREA (1979) pp. 28–31.Google Scholar
4. Weir, A.H., Ormerod, E.C., and Elmansey, I.M., Clay Minerals, 10, 369 (1975).Google Scholar
5. Jager, E., Niggli, E. and Wenke, E., Lieferung, 131, 1 (1967).Google Scholar
6. Dodson, M.H., in Lectures in Isotope Geology, Edited by Jager, E., Hunziker, J.C., (Springer-verlag, Heiderberg, 1979) pp. 194–202.Google Scholar
7. Wagner, G.A., Reimer, G.M. and Jager, E., Mem. I st Geol. Mineral. Univ. Padova, 30 (1977).Google Scholar
8. Harrison, T.M. and McDougall, I., Geochim. Cosmochim. Acta. 111, 1985 (1980).Google Scholar
9. Naeser, C.W., Cunningham, C.G., Marvin, R.F. and Obradvich, J.D., Econ. Geol. 75, 122 (1980).Google Scholar
10. Harrison, T.M., Armstrong, Rl., Naeser, C.W. and Harakal, J.E., Jour. Earth. Scd. 16, 100 (1979).Google Scholar
11. Nishimura, S. and Mogi, T., Jour. Geotherm. Res. Soc. Japan, 8, 115 (1986).Google Scholar
12. Aoyagi, K., Jour. Japanese Assoc. Petroleum Technology, 41, 367 (1979)Google Scholar
13. Kazama, K., Jour. Japanese Assoc. Petroleum Technology, 15, 362 (1980)Google Scholar
14. Oda, Y., Suzuki, S. and Ohyama, Y., Jour. Petrol. Mineral. Econ. Geol. 80, 526 (1985).Google Scholar
15. Friesman, I. and Smith, R.L., Geochim. Cosmochim. Acta. 15, 218 (1959).Google Scholar
16. Godfrey, J.P., Geochim. Cosmochim. Acta. 26, 1215 (1962).Google Scholar
17. Epstein, S. and Tailor, H.P. Jr, Proc. Appolo 11 Lunner Sci. Conf. 12, 1085 (1970).Google Scholar
18. O'neil, J.R. and Karaka, Y.K., Geochim. Cosmochim. Acta. 40, 241 (1976).Google Scholar
19. Matsubaya, O., Jour. New Energy Foundation. 10, 2. 112 (1985).Google Scholar
20. Eberl, D. and Hower, J., Geol Soc. Amer. Bull. 87, 1326 (1976).Google Scholar
21. Sudo, T., Nendo Kagaku 22, 3. 91 (1982).Google Scholar
22. Roberson, H.E. and Lahann, R.W., Clays and Clay Minerals, 29, 2. 129 (1981).Google Scholar