Abstract
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.
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Ahn, J. H., Lee, J. H., and Peacor, D. R. (1983) Mineralogical and textural transitions in phyllosilicates during burial diagenesis of Gulf Coast shales: Geol. Soc. Amer. Ann. Meet. Abstr. with Prog. 15, p. 512.
Ahn, J. H. and Peacor, D. R. (1984) The smectite to illite transformation in Gulf Coast argillaceous sediments based on microstructure by TEM/AEM: Prog. with Abstracts, Ann. Meet. Clay Minerals Soc., Baton Rouge, Louisiana, 1984, p. 22.
Freed, R. L. and Peacor, D. R. (1984) Complete dehydration of illite/smectite in Gulf Coast overpressured shales: Amer. Assoc. Pet. Geol. Bull. Tech. Prog. Summ. and Abstr. 68, p. 498.
Isaacs, A. M., Brown, P. E., Valley, J. W., Essene, E. J., and Peacor, D. R. (1981) An analytical electron microscopic study of a pyroxene-amphibole intergrowth: Contrib. Min. Pet. 77, 115–120.
Klimentidis, R. E. and Mackinnon, D. R. (1984) High resolution electron microscopy of mixed-layer clays: Prog. with Abstracts, Ann. Meet. Clay Minerals Soc, Baton Rouge, Louisiana, 1984, p. 70.
Lee, J. H., Ahn, J. H., and Peacor, D. R. (1985) Textures in layered silicates: progressive changes through diagenesis and low temperature metamorphism: Sed. Petrol. 33, 228–236.
Lee, J. H. and Peacor, D. R. (1983) Intralayer transitions in phyllosilicates of the Martinsburg Shale: Nature 303, 608–609.
Page, R. and Wenk, H. R. (1979) Phyllosilicate alteration of plagioclase studied by transmission electron microscopy: Geology 7, 393–397.
Peacor, D. R., Essene, E. J., Lee, J. H., and Kuo, L.-C. (1984) Analysis of factors affecting the stability of backfill materials: Proc. U.S. Nuclear Regulatory Commission, NRC Nuclear Waste Geochemistry’ 83, D. H. Alexander and G. F. Birchard, eds., NUREC/CP-0052 RW, 234–293.
Yoshida, T. (1973) Elementary layers in the interstratified clay minerals as revealed by electron microscopy: Clays & Clay Minerals 21, 413–420.
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Contribution No. 410, Mineralogical Laboratory, Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109.
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Lee, J.H., Peacor, D.R. Expansion of Smectite by Laurylamine Hydrochloride: Ambiguities in Transmission Electron Microscope Observations. Clays Clay Miner. 34, 69–73 (1986). https://doi.org/10.1346/CCMN.1986.0340108
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DOI: https://doi.org/10.1346/CCMN.1986.0340108