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Formation of Smectite Crystals at High Pressures and Temperatures

Published online by Cambridge University Press:  28 February 2024

Hirohisa Yamada ,
Hiromoto Nakazawa  and
Hideo Hashizume
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
Hideo Hashizume
Affiliation:
National Institute for Research in Inorganic Materials, Namiki 1, Tsukuba, Ibaraki 305, Japan
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Abstract

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Smectite single crystals of superior quality were synthesized at high pressures and temperatures using a modified belt type high pressure apparatus. Pressure-temperature conditions were established for smectite formation by quenching experiments in the pressure range from 2–5.5 GPa and temperatures of 700°–1000°C. Smectite crystals with extraordinary quality were formed beyond 3 GPa and 1000°C with coexisting phases of coesite, kyanite, jadeite, and in some cases with mica and glass. Smectite was confirmed from the XRD taken after intercalation of ethylene glycol. The smectite crystals were considered to be quenched crystals metastably from the hydrous silicate melts formed at high pressures and temperatures.

Keywords

High pressureHigh temperatureSmectiteSynthesis
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 6 , December 1994 , pp. 674 - 678
Copyright
Copyright © 1994, Clay Minerals Society

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