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Illite/Smectite from Gulf Coast Shales: A Reappraisal of Transmission Electron Microscope Images

Published online by Cambridge University Press:  02 April 2024

Jung Ho Ahn  and
Donald R. Peacor
Jung Ho Ahn
Affiliation:
Department of Geology, Arizona State University, Tempe, Arizona 85287
Donald R. Peacor
Affiliation:
Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109
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Abstract

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Transmission electron microscope (TEM) images of mixed-layer illite/smectite (I/S) from Gulf Coast shales obtained earlier by the authors have been reexamined by comparing them with the calculated images of G. D. Guthrie and D. R. Veblen. Ordered two-layer periodicity was not detected in the 1750- and 2450-m depth samples, for which X-ray powder diffraction (XRD) showed 20% and 40% illite randomly interstratified in I/S, respectively. Two-layer periodicities that occur in images of the 5500-m depth sample were inferred to reflect ordered I/S. XRD data for the same sample imply the presence of 80% illite in RI-ordered I/S. The two-layer periodicities were observed in slightly overfocused images, consistent with the image calculations of Guthrie and Veblen, with strong dark fringes inferred to correspond to smectite interlayers. Two-layer periodicities were observed only in small domains of a few of the images, consistent with the requirement of special orientation of layers, which varies continuously over a wide range. The lack of more frequent observations of ordered periodicities in TEM images may reflect the lack of the special observation conditions and chemical heterogeneity of illite and smectite layers. Ordered mixed-layering may exist in those specimens for which XRD indicates such ordering, in contrast to the previous interpretation of the authors.

Keywords

Illite/smectiteLattice-fringe imagesPeriodicityTransmission electron microscopyX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 6 , December 1989 , pp. 542 - 546
Copyright
Copyright © 1989, The Clay Minerals Society

Footnotes

1

Contribution 460 from the Mineralogical Laboratory, Department of Geological Sciences, The University of Michigan, Ann Arbor, Michigan 48109.

References

Ahn, J. H., Buseck, P. R. and Reynolds, R.C., 1988 Stacking sequences of mixed-layer illite/smectite: HRTEM imaging Program with Abstracts, 25th Annual Meeting of The Clay Minerals Society, Grand Rapids, Michigan, 1988 73.Google Scholar
Ahn, J. H. and Peacor, D. R., 1986 Transmission and analytical electron microscopy of the smectite-to-illite transition Clays & Clay Minerals 34 165 – 179.Google Scholar
Ahn, J. H. and Peacor, D. R., 1986 Transmission electron microscope data for rectorite: Implications for the origin and structure of “fundamental particles” Clays & Clay Minerals 34 180 – 186.Google Scholar
Bell, T. E., 1986 Microstructure in mixed-layer illite/smectite and its relationship to the reaction of smectite to illite Clays & Clay Minerals 34 146 – 154.CrossRefGoogle Scholar
Guthrie, G. D. and Veblen, D. R., 1989 High-resolution transmission electron microscopy of mixed-layer illite/smectite: Computer simulations Clays & Clay Minerals 37 1 – 11.CrossRefGoogle Scholar
Hansen, P. L., Lindgreen, H. and Bailey, G. W., 1987 Structural investigations of mixed-layer smectite-illite clay minerals from North Sea oil rocks Proc. 45th Annual Meeting, Electron Microsc. Soc. Amer. San Francisco San Francisco Press 374 – 375.Google Scholar
Hower, J., Eslinger, E. V., Hower, M. E. and Perry, E. A., 1976 Mechanism of burial metamorphism of argillaceous sediment: 1. Mineralogical and chemical evidence Geol. Soc. Amer. Bull. 87 725 – 737.2.0.CO;2>CrossRefGoogle Scholar
Huff, W. D., Whiteman, J. H. and Curtis, C. D., 1988 Investigation of a K-bentonite by X-ray powder diffraction and analytical transmission electron microscopy Clays & Clay Minerals 36 83 – 93.CrossRefGoogle Scholar
Klimentidis, R. E. and Mackinnon, I. D. R., 1986 High-resolution imaging of ordered mixed-layer clays Clays & Clay Minerals 34 155 – 164.CrossRefGoogle Scholar
Lee, J. H., Ahn, J. H. and Peacor, D. R., 1985 Textures in layered silicates: Progressive changes through diagenesis and low temperature metamorphism J. Sed. Petrol. 55 532 – 540.Google Scholar
Lee, J. H. and Peacor, D. R., 1986 Expansion of smectite by laurylamine hydrochloride: Ambiguities in transmission electron microscope observations Clays & Clay Minerals 34 69 – 73.CrossRefGoogle Scholar
McKee, T. R. and Buseck, P. R., 1978 HRTEM observation of stacking and ordered interstratification in rectorite Electron Microscopy 1978 1 272 – 273.Google Scholar
Nadeau, P. H., Wilson, M. J., McHardy, W. J. and Tait, J. M., 1984 Interparticle diffraction: A new concept for interstratified clays Clay Miner. 19 757 – 769.CrossRefGoogle Scholar
Nadeau, P. H., Wilson, M. J., McHardy, W. J. and Tait, J. M., 1984 Interstratified clays as fundamental particles Science 225 923 – 925.CrossRefGoogle ScholarPubMed
Nadeau, P. H., Tait, J. M., McHardy, W. J. and Wilson, M. J., 1984 Interstratified XRD characteristics of physical mixtures of elementary clay particles Clay Miner. 19 67 – 76.CrossRefGoogle Scholar
Reynolds, R. C. Jr. and Hower, J., 1970 The nature of interlayering in mixed-layer illite/montmorillonite Clays & Clay Minerals 18 25 – 36.CrossRefGoogle Scholar
Vali, H. and Koster, H. M., 1986 Expanding behavior, structural disorder, regular and random irregular interstratification of 2:1 layer-silicates studied by high-resolution images of transmission electron-microscopy Clay Miner. 21 827 – 859.CrossRefGoogle Scholar
Veblen, D. R. and Buseck, P. R., 1980 Microstructures and reaction mechanisms in biopyriboles Amer. Mineral. 65 599 – 623.Google Scholar
Veblen, D. R., Guthrie, G. D. and Livi, K. J. T., 1990 High resolution transmission electron microscopy and electron diffraction of mixed-layer illite/smectite: Experimental results Clays & Clay Minerals 38 1 – 13.CrossRefGoogle Scholar
Yau, Y.-C. Peacor, D. R. and McDowell, S. D., 1987 Smectite to illite reactions in Salton Sea Shales: A transmission and analytical electron microscopy study J. Sed. Petrol. 57 335 – 342.Google Scholar
Yoshida, T., 1973 Elementary layers in the interstratified clay minerals as revealed by electron microscopy Clays & Clay Minerals 21 413 – 420.CrossRefGoogle Scholar