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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

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1945-3027
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Volume 92, Issue 10

Issues

XRD and HRTEM analyses of stacking structures in sudoite, di-trioctahedral chlorite

Jun Kameda
  • Corresponding author
  • Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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/ Ritsuro Miyawaki
  • Department of Geology, The National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku-ku, Tokyo, 169-0073, Japan
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/ Ryuji Kitagawa
  • Deparment of Earth and Planetary System Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
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/ Toshihiro Kogure
  • Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2410

Abstract

The stacking structures of sudoite, di-trioctahedral chlorite from two different localities are investigated by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). XRD analyses using a Gandolfi camera revealed that the structures of both specimens are similar, corresponding to a one-layer IIbb-4 (1A) polytype. HRTEM observations indicate that the stacking sequence is characterized by a largely uniform intralayer shift of a/3 in the -X1 direction (Xi represent the directions along the pseudohexagonal axes) and by an interlayer displacement of similar magnitude in either the -X2 or -X3 direction. Stacking disorder is primarily caused by the mixing of interlayer displacements in the two directions. This disorder is more common in the lath-shaped crystalline specimen from Berezovsk, Russia than in the fine platy crystalline specimen from Ottré, Belgium. DIFFaX simulations of the powder XRD patterns for this stacking model reproduced the observed features well for both specimens. The stacking configuration of these sudoite specimens is considered to be controlled by the corrugation of basal oxygen planes in the 2:1 layer and the corresponding deformation in the brucite-like interlayer sheet.

Keywords: Crystal structure; sudoite; transmission electron microscopy; polytypism

About the article

Received: 2006-08-06

Accepted: 2007-05-21

Published Online: 2015-04-01

Published in Print: 2007-10-01


Citation Information: American Mineralogist, Volume 92, Issue 10, Pages 1586–1592, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2410.

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