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A transmission electron microscope and X-ray diffraction study of muscovite and chlorite

Published online by Cambridge University Press:  05 July 2018

G. Oertel ,
C. D. Curtis  and
P. P. Phakey
G. Oertel
Affiliation:
Department of Geology, University of California, Los Angeles, California
C. D. Curtis
Affiliation:
Department of Geology, University of California, Los Angeles, California
P. P. Phakey
Affiliation:
Department of Geology, University of California, Los Angeles, California
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Summary

Single-crystal diffraction patterns produced by transmitted radiation, both X-rays and electrons, reveal varying degrees of disorder and long-range order in common phyllosilicates from several different rock types. The transmission electron micrographs and their selected-area diffraction patterns demonstrate the presence of numerous stacking faults parallel to (001) of muscovite and chlorite. Individual stacking faults can be recognized by the diffraction-contrast fringe patterns they cause, and partial dislocations can be seen where such faults terminate inside a crystal. Long-range order of muscovite explains what seemed to be spurious, high ‘background’ levels that are sometimes encountered in the analysis of rock fabrics by transmitted X-rays.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 302 , June 1973 , pp. 176 - 188
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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