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Cooling Rate Dependency of the Formation of Smectite Crystals from a High-Pressure and High-Temperature Hydrous Melt

Published online by Cambridge University Press:  28 February 2024

Hirohisa Yamada ,
Hiromoto Nakazawa  and
Eiji Ito
Hirohisa Yamada
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki 305, Japan
Hiromoto Nakazawa
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki 305, Japan
Eiji Ito
Affiliation:
Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-02, Japan
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Abstract

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The effect of cooling rate on the formation of smectite crystals with high crystallinity was investigated using two different types of high-pressure and high-temperature apparatus, a modified belt type and a uniaxial split-sphere type. The cooling rate was changed after a treatment of the sample at 5.5 GPa and 1500°C. Smectite crystals were obtained at faster cooling rate, coexisting with coesite, kyanite, jadeite, corundum and/or glass. In the slowly cooled process, no smectite crystals were obtained but coesite, kyanite, jadeite and clinoenstatite were formed. These results indicate that smectite crystals are formed metastably during the quenching of the high-pressure and high-temperature hydrous silicate melt.

Keywords

High pressure experimentQuenching rateSmectite crystals
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 6 , December 1995 , pp. 693 - 696
Copyright
Copyright © 1995, The Clay Minerals Society

References

Akimoto, S., and Sato, Y. 1968. High pressure transformation in Co2SiO4 olivine and some geophysical implications. Phys. Earth Planet. Interiors. 1: 498–505.Google Scholar
Akimoto, S., Yagi, T., and Inoue, K. 1977. High temperature-pressure phase boundaries in silicate system using in situ X-ray diffraction. In High-Pressure Research: Applications in Geophysics. Manghnani, M. H., and Akimoto, S., eds. New York: Academic Press, 585–602.Google Scholar
Ito, E., Takahashi, E., and Matsui, Y. 1984. The mineralogy and chemistry of the lower mantle: an implication of the ultrahigh-pressure phase relations in the system MgO-FeO-SiO2. Earth Planet. Sci. Letters. 67: 238–248.Google Scholar
Ito, E., and Takahashi, E. 1989. Postspinel transformations in the system Mg2SiO4-Fe2SiO4 and some geophysical implications. J. Geophys. Res. 94: 10637–10646.Google Scholar
Kanda, H., Akaishi, M., and Yamaoka, S. 1990. Morphology of synthetic diamonds grown from Na2CO3 solvent-catalyst. J. Cryst. Growth. 106: 471–475.Google Scholar
Kanzaki, M. June 1993. Department of Medicine Science, Faculty of Engineering, Tokyo Institute of Technology, OOkayama 2-12-1, Meguro-ku, Tokyo 152, Japan.Google Scholar
Nakazawa, H., Yamada, H., and Fujita, T. 1992. Crystal synthesis of smectite applying very high pressure and temperature. Applied Clay Science. 6: 395–401.Google Scholar
Takahashi, E., Yamada, H., and Ito, E. 1982. An ultrahigh-pressure furnace assembly to 100 kbar and 1500 °C with minimum temperature uncertainty. Geophys. Res. Letters. 9: 805–807.Google Scholar
Wyllie, P., 1979. Magmas and volatile components. Am. Mineral. 64: 469–500.Google Scholar
Yamada, H., Nakazawa, H., and Hashizume, H. 1994. Formation of smectite crystals at high pressures and high temperatures. Clays & Clay Miner. 42: 674–678.Google Scholar
Yamaoka, S., Akaishi, M., Kanda, H., Osawa, T., Taniguchi, T., Sei, H., and Fukunaga, O. 1992. Development of belt type high pressure apparatus for material synthesis at 8 GPa. J. High Pressure Inst. Japan. 30: 249-258 (in Japanese with English abstract).Google Scholar
Yoshikawa, T., Yamaoka, S., Akaishi, M., Kanda, H., Mishima, O., Osawa, T., and Fukunaga, O. 1988. Temperature distribution in specimen of belt type high pressure apparatus. J. High Pressure Inst. Japan. 26: 3-10 (in Japanese with English abstract).Google Scholar