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Scan Electron Micrographs of Kaolins Collected from Diverse Origins—III. Influence of Parent Material on Flint Clays and Flint-Like Clays

Published online by Cambridge University Press:  01 July 2024

W. D. Keller
W. D. Keller*
Affiliation:
Department of Geology, University of Missouri-Columbia, Columbia, MO, U.S.A.
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Abstract

The nature of the parent material from which flint clay or flint-like clay is derived may modify the texture of the clay as observed by SEM. Flint clays occurring in Pennsylvanian-age swamp basins into which were transported residues weathered from sedimentary country rock exhibit a texture of interlocked kaolin pockets and sheaves. On the other hand, flint clay or flint-like clay derived by weathering of volcanic ash exhibits a texture resembling, on a micro-scale, the scalloped, “oak-leaf” pattern of montmorillonite. The interpretation is that an expanding clay having a transitional role between the ash and the kaolinite is the donor source of the micro-scalloped pattern inherited by kaolinite. X-ray powder diffractograms of the clays support the interpretation.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 5 , October 1976 , pp. 262 - 264
Copyright
Copyright © 1976 The Clay Minerals Society

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