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Microtopography of Regularly-Interstratified Mica and Smectite

Published online by Cambridge University Press:  28 February 2024

Ryuji Kitagawa  and
Toshihiko Matsuda
Ryuji Kitagawa
Affiliation:
Institute of Geology and Mineralogy, Faculty of Science, Hiroshima University, 1-3 Kagamiyama, Higashihiroshima 724, Japan
Toshihiko Matsuda
Affiliation:
Department of Earth Sciences, Okayama University, Tsushimanaka, Okayama 700, Japan
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Abstract

The gold decoration technique of electron microscopy was used to observe the microtopography of natural (001) surfaces of 1:1 regularly-interstratified mica/smectite minerals (expandable layer: 40–45%) collected from four different pyrophyllite deposits in Japan. The specimens are characterized by parallel growth steps of malformed, circular or polygonal forms with varying step separations. Many particles exhibit paired steps that seem to show spiral growth. Microtopographic observations suggest that the growth of regular interstratification (at least for the specimens investigated in this study) normally takes place by an interlacing of paired steps. If the height of a single step corresponds to that of a mica or a smectite layer, the particles are estimated to be normally 40–300 Å in thickness. If the particles on which a spiral center is observed are single crystals of interstratified mica and smectite, then some crystals investigated in this study are far thicker than fundamental particles. The results of this study are interpreted to suggest that these regularly-interstratified mica/smectites were formed by hydrothermal metasomatism from their respective host rocks.

Keywords

Au-decorationElectron microscopyFundamental particlesInterstratified mica/smectiteSurface microtopography
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 1 , February 1992 , pp. 114 - 121
Copyright
Copyright © 1992, The Clay Minerals Society

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