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A Technique for Maintaining Texture and Permanent Expansion of Smectite Interlayers for TEM Observations

Published online by Cambridge University Press:  28 February 2024

Jin-Wook Kim ,
Donald R. Peacor ,
Daniel Tessier  and
Francoise Elsass
Jin-Wook Kim
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
Daniel Tessier
Affiliation:
Station de Science du Sol, INRA, 78026 Versailles, France
Francoise Elsass
Affiliation:
Station de Science du Sol, INRA, 78026 Versailles, France
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Abstract

A process for treating smectite-bearing rock samples that utilizes LR White resin; allows TEM observation of expanded smectite interlayers and therefore preservation of original rock textures. Examples of several lattice fringe images are shown, including: (1) Dioctahedral smectite layers from a shale (1388.9 meter depth, Texas Gulf Coast) give fringes that consistently have spacings of 1.2–1.3 nm, yet duplicate other features previously observed in collapsed samples. (2) Packets of illite layers give fringes with 1.0-nm spacings coexisting with packets of (dominantly) R1 I/S having 2.1-nm lattice fringe spacings in a Gulf Coast shale from 4742.1 m. (3) Rectorite from Garland Co., Arkansas gives 2.3-nm lattice fringes. Samples with wide ranges of I/S ratios and lithologies have been found to be permanently expanded with retention of original textures, commonly leading to unambiguous identification of illite and smectite interlayers in lattice fringe images.

Keywords

IlliteLR White resinR1 I/SRectoriteSmectiteTransmission electron microscopy (TEM)
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 1 , February 1995 , pp. 51 - 57
Copyright
Copyright © 1995, The Clay Minerals Society

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