Abstract
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.
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References
Akimoto, S., and Y. Sato. 1968. High pressure transformation in Co2SiO4 olivine and some geophysical implications. Phys. Earth Planet. Interiors. 1: 498–505.
Akimoto, S., T. Yagi, and K. Inoue. 1977. High temperature-pressure phase boundaries in silicate system using in situ X-ray diffraction. In High-Pressure Research: Applications in Geophysics. M. H. Manghnani and S. Akimoto, eds. New York: Academic Press, 585–602.
Ito, E., E. Takahashi, and Y. Matsui. 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.
Ito, E., and E. Takahashi. 1989. Postspinel transformations in the system Mg2SiO4-Fe2SiO4 and some geophysical implications. J. Geophys. Res. 94: 10637–10646.
Kanda, H., M. Akaishi, and S. Yamaoka. 1990. Morphology of synthetic diamonds grown from Na2CO3 solvent-catalyst. J. Cryst. Growth. 106: 471–475.
Kanzaki, M. June 1993. Department of Medicine Science, Faculty of Engineering, Tokyo Institute of Technology, OOkayama 2-12-1, Meguro-ku, Tokyo 152, Japan.
Nakazawa, H., H. Yamada, and T. Fujita. 1992. Crystal synthesis of smectite applying very high pressure and temperature. Applied Clay Science. 6: 395–401.
Takahashi, E., H. Yamada, and E. Ito. 1982. An ultrahigh-pressure furnace assembly to 100 kbar and 1500 °C with minimum temperature uncertainty. Geophys. Res. Letters. 9: 805–807.
Wyllie, P. 1979. Magmas and volatile components. Am. Mineral. 64: 469–500.
Yamada, H., H. Nakazawa, and H. Hashizume. 1994. Formation of smectite crystals at high pressures and high temperatures. Clays & Clay Miner. 42: 674–678.
Yamaoka, S., M. Akaishi, H. Kanda, T. Osawa, T. Taniguchi, H. Sci, and O. Fukunaga. 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).
Yoshikawa, T., S. Yamaoka, M. Akaishi, H. Kanda, O. Mishima, T. Osawa, and O. Fukunaga. 1988. Temperature distribution in specimen of belt type high pressure apparatus. J. High Pressure Inst. Japan. 26: 3–10 (in Japanese with English abstract).
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Yamada, H., Nakazawa, H. & Ito, E. Cooling Rate Dependency of the Formation of Smectite Crystals from a High-Pressure and High-Temperature Hydrous Melt. Clays Clay Miner. 43, 693–696 (1995). https://doi.org/10.1346/CCMN.1995.0430605
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DOI: https://doi.org/10.1346/CCMN.1995.0430605