Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-15T05:23:15.228Z Has data issue: false hasContentIssue false
  • English
  • Français

“Chloritized” Vermiculite in a Korean Ultisol Studied by Ultramicrotomy and Transmission Electron Microscopy

Published online by Cambridge University Press:  02 April 2024

Koji Wada  and
Yasuko Kakuto
Koji Wada
Affiliation:
Faculty of Agriculture, Kyushu University 46, Fukuoka 812, Japan
Yasuko Kakuto
Affiliation:
Faculty of Agriculture, Kyushu University 46, Fukuoka 812, Japan
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

“Chloritized” vermiculite coexisting with kaolin-group minerals, vermiculite, mica, and gibbsite in the 0.2–0.5-µM fraction separated from a Korean Ultisol was studied by ultramicrotomy and high-resolution electron microscopy. The (001) lattice images observed from thin sections showed that the “chloritized” vermiculite was composed of particles which differed in their shape and the stacking of silicate layers. On saturation with K+, the silicate layers had spacings of 14–10 Å, with 14–12-Å layers being dominant. The 8–7-Å layers of a few particles appeared to be segregated close to the basal plane surfaces, but not necessarily close to the edge surfaces. The silicate layers were more or less curved and wavy and were commonly discontinuous. They formed packets (100–500 Å thick) by stacking, which were associated “face-to-face” and/or “edge-to-edge” or stacked parallel or subparallel to form particles of different shapes. The extent of interlayer collapse of the 14-Å layers on heating differed from one particle to the other, but was fairly uniform within a particle. Treatment with hot 1/3 M sodium citrate dissolved the interlayer material and possibly the material present between the packets from the “chloritized” vermiculite and from a few fine plates of kaolin-group minerals. The interlayer material and its chemical composition, therefore, could not be determined.

Keywords

Chloritized vermiculiteStacking arrangementTransmission electron microscopyUltramicrotomyVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 3 , June 1989 , pp. 263 - 268
Copyright
Copyright © 1989, The Clay Minerals Society

References

Barnhisel, R. I., Dixon, J. B. and Weed, S. B., 1977 Chlorites and hydroxy interlayered vermiculite and smectite Minerals in Soil Environments Madison, Wisconsin Soil Science Society of America 331 – 356.Google Scholar
Douglas, L. A., Dixon, J. B. and Weed, S. B., 1977 Vermiculites . Minerals in Soil Environments Madison, Wisconsin Soil Science Society of America 259 – 292.Google Scholar
Frink, C. R., 1965 Characteristics of aluminum interlayers in soil clays Soil Sci. Soc. Amer. Proc 29 379 – 382.CrossRefGoogle Scholar
Mehra, O. P., Jackson, M. L. and Swineford, A., 1960 Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate Clays and Clay Minerals, Proc. 8th Natl. Conf., Norman, Oklahoma, 1959 New York Pergamon Press 317 – 327.Google Scholar
Rich, C. I., 1968 Hydroxy interlayers in expansible layer silicates Clays & Clay Minerals 16 15 – 30.CrossRefGoogle Scholar
Tamura, T., 1958 Identification of clay minerals from acid soils J. Soil Sci 9 141 – 147.CrossRefGoogle Scholar
Wada, K. and Kakuto, Y., 1983 Intergradientvermiculite-kaolin minerals in a Korean Ultisol Clays & Clay Minerals 31 183 – 190.CrossRefGoogle Scholar
Wada, K. and Kakuto, Y., 1983 A new intergradient vermiculite-kaolin mineral in 2:1 to 1:1 mineral transformation Pétrologie des Altérations et des Sols, Science Géologiques Mémoire 73 123 – 131.Google Scholar