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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

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