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Chlorite-illite/muscovite interlayered and interstratified crystals: A TEM/STEM study

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Abstract

Phyllosilicates in rocks which are transitional from mudstone to slate from Lehigh Gap, Pa., have been studied by a variety of techniques, including high resolution Transmission Electron Microscopy and Analytical Electron Microscopy. The principal minerals are “white mica” which is transitional from illite in mudstone to ordered twolayer mica in slate, and chlorite. 7Å berthierine occurs more rarely. Dioctahedral and trioctahedral layers are shown to be interleaved in individual crystals at all scales between the following two end members: (1) both random and regular 1∶1 interlayering at the scale of individual layers, as shown, in part, by lattice fringe images. (2) packets of trioctahedral and dioctahedral layers up to a few thousand Ångstroms or microns in thickness, detectable with ordinary optical techniques. The complete range of intermediate structures is represented in samples which are in transition to slate. Bulk analytical (EMPA), X-ray diffraction or other measurements are shown to result in averages over both kinds of layers when TEM techniques are not used.

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Author notes

  1. Daniel D. Lewis

    Present address: Exon Company USA, P.O. Box 120, 80201, Denver, Colorado, USA

Authors and Affiliations

  1. Department of Geological Sciences, The University of Michigan, 48109, Ann Arbor, Michigan, USA

    Jung Hoo Lee & Donald R. Peacor

  2. Department of Geology, Indiana University, 47405, Bloomington, Indiana, USA

    Daniel D. Lewis & Robert P. Wintsch

Authors
  1. Jung Hoo Lee
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  2. Donald R. Peacor
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  3. Daniel D. Lewis
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  4. Robert P. Wintsch
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Additional information

Contribution No. 400 from the Mineralogical Laboratory, Department of Geological Sciences, The University of Michigan

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Lee, J.H., Peacor, D.R., Lewis, D.D. et al. Chlorite-illite/muscovite interlayered and interstratified crystals: A TEM/STEM study. Contr. Mineral. and Petrol. 88, 372–385 (1984). https://doi.org/10.1007/BF00376762

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