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Clay Mineralogy of Andesite Saprolite

Published online by Cambridge University Press:  01 July 2024

D. M. Hendricks ,
L. D. Whittig  and
M. L. Jackson
D. M. Hendricks*
Affiliation:
Department of Soils and Plant Nutrition, University of California, Davis, California
L. D. Whittig
Affiliation:
Department of Soils and Plant Nutrition, University of California, Davis, California
M. L. Jackson
Affiliation:
Department of Soil and Water Sciences, University of Wisconsin, Madison, Wisconsin
*
*Present address: Department of Agricultural Chemistry and Soils, University of Arizona, Tucson, Arizona.
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Abstract

Clay mineral associations in saprolite of two andesites from the Cascade Range of northeastern California were determined. Sesquioxidic allophane with a high CEC delta value dominates the clay fraction of the least weathered saprolite in each series (47% and 37% in hypersthene andesite and olivine andesite saprolites, respectively). With further weathering, the content of amorphous clay remains high (over 30% in all cases) but the CEC delta value of the clay drops markedly. The amorphous material in the more weathered saprolite has the properties of halloysitic allophane. Halloysite, present in all saprolites, is highest in concentration (over 30%) in the more strongly weathered members of each of the saprolite series. Formation of sesquioxidic allophane during early stages of weathering and its transformation to halloysitic allophane and halloysite during later stages of weathering are supported by X-ray diffraction, electron microscopic, DTA, elemental analysis, and CEC delta value data.

Type
General
Information
Clays and Clay Minerals , Volume 15 , February 1967 , pp. 395 - 407
Copyright
Copyright © 1967, Springer International Publishing

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