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Expansion of Smectite by Laurylamine Hydrochloride: Ambiguities in Transmission Electron Microscope Observations

Published online by Cambridge University Press:  02 April 2024

Jung Hoo Lee  and
Donald R. Peacor
Jung Hoo Lee*
Affiliation:
Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109
Donald R. Peacor
Affiliation:
Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109
*
2Present address: Department of Geology, Jeonbuk National University, Jeonju, South Korea.
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Abstract

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Treatment of smectite with laurylamine hydrochloride was verified to cause expansion of d(001) which may be retained and observed in ion-milled samples by transmission electron microscopy. The spacings between layers as observed in lattice fringe images, however, are variable and may be as small as 10 Å. The method therefore produces ambiguities in differentiating between some smectites and illites, similar to those that have been found for untreated samples; e.g., on this basis, expanded layers may be inferred to be smectite, but layers with d-values approaching 10 Å may be either illite or smectite. Expansion also destroys the original rock texture, which, therefore, must be observed using only untreated samples.

Keywords

ExpansionIlliteLattice fringe imagesLaurylamine hydrochlorideSmectiteTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 1 , February 1986 , pp. 69 - 73
Copyright
Copyright © 1986, The Clay Minerals Society

Footnotes

1

Contribution No. 410, Mineralogical Laboratory, Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109.

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