Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.


IMPACT FACTOR 2018: 1.090
5-year IMPACT FACTOR: 2.159

CiteScore 2018: 1.47

SCImago Journal Rank (SJR) 2018: 0.892
Source Normalized Impact per Paper (SNIP) 2018: 0.722

Online
ISSN
2196-7105
See all formats and pricing
More options …
Volume 234, Issue 5

Issues

Identification of twins in muscovite: an electron backscattered diffraction study

Shan-Rong Zhao / Chang Xu / Chuan Li
Published Online: 2019-01-26 | DOI: https://doi.org/10.1515/zkri-2018-2139

Abstract

Twins in micas are difficultly identified due to mica’s hexagonal pseudosymmetry. Many theoretic studies on mica twins have been reported but experimental observations are very limited. In this paper, we present an electron backscattered diffraction analysis to identify twins in the muscovite in a quartz schist occurring in the UHP-HP metamorphic rock belt in Dabie Mountain, China. A trilling twin with twin law <310>/{110} is common in the muscovite. A six-couplet twin consisting of two trilling twins related by twin laws <110>/{130} and <001>/{001}(or <100>/{100}) has been discovered. This six-couplet twin contains many cross-twin relationships among the most common mica twin laws <310>/{110}, <110>/{130} and <001>/{001}. The composition plane for twin laws <110>/{130} and <001>/{001} is {001} which is reasonable in mica structure to form a twin by rotation around twin axes, and that for twin law <310>/{110} is irregular based on EBSD resolution. A possible misindexation of a trilling twin or a 3T polytype during EBSD test is discussed, which is helpful to distinguish a twin from a polytype in micas. The occurring frequency of twin law <310>/{110} is higher than that of twin laws <110>/{130} and <001>/{001}, which is consistent to the deducing result from mica structure analysis. This research provides a convenient and effective EBSD method to identify mica twins and an experimental method to distinguish a twin from a polytype in micas, which is a problem confusing researchers for many years.

Keywords: EBSD; muscovite; pole figure; polytype; twin

References

  • [1]

    G. Donnay, N. Morimoto, Trioctahedral one-layer micas. I. Crystal structure of a synthetic iron mica. Acta Crystallogr. 1964, 17, 1369.CrossrefGoogle Scholar

  • [2]

    M. Nespolo, H. Takeda, G. Ferrais, T. Kogure, Composite twins of 1M mica: derivation and identification. Mineral. J. 1997, 19, 173.CrossrefGoogle Scholar

  • [3]

    M. Nespolo, G. Ferrais, H. Takeda, Twins and allotwins of basic mica polytypes: theoretical derivation and identification in the reciprocal space. Acta Crystallogr. A 2000, 56, 132.CrossrefGoogle Scholar

  • [4]

    M. Rieder, Lithium-iron micas from the Krusnehory Mountains (Erzgebirge): twins, epitactic overgrowths and polytypes. Z. Kristallogr. 1970, 132, 161.CrossrefGoogle Scholar

  • [5]

    R. Sadanaga, Y. Takfiuchi, Polysynthetic twinning of micas. Z. Kristallogr. 1961, 116, 406.CrossrefGoogle Scholar

  • [6]

    M. Nespolo, G. Ferrais, H. Takeda, Identification of two allotwins of mica polytypes in reciprocal space through the minimal rhombus unit. Acta Crystallogr. B 2000, 56, 639.CrossrefGoogle Scholar

  • [7]

    L. Menegon, S. Piazolo, G. Pennacchioni, The effect of Dauphiné twinning on plastic strain in quartz. Contrib Mineral Petrol 2011, 161, 635.CrossrefWeb of ScienceGoogle Scholar

  • [8]

    S. R. Zhao, H. J. Xu, Q. Y. Wang, K. G. Yang, Electron backscatter diffraction study on twins and intergrowths among quartz crystals in granite. J. Appl. Crystallogr. 2013, 46, 1414.CrossrefWeb of ScienceGoogle Scholar

  • [9]

    C. F. Ávila, L. Lagoeiro, P. F. Barbosa, L. Graca, EBSD analysis of rhombohedral twinning in hematite crystals of naturally deformed iron formation. J. Appl. Crystallogr. 2015, 48, 212.CrossrefGoogle Scholar

  • [10]

    C. R. Brugger, J. E. Hammer, Prevalence of growth twins among anhedral plagioclase micrilites. Am. Mineral. 2015, 100, 385.CrossrefGoogle Scholar

  • [11]

    C. Xu, S. R. Zhao, C. Li, X. He, Plagioclase twins in basalt – an electron backscatter diffraction study. J. Appl. Crystallogr. 2016, 49, 2145.CrossrefWeb of ScienceGoogle Scholar

  • [12]

    X. C. Liu, S. Z. Li, B. M. Jahn, Tectonic evolution of the Tongbai-Hong’an orogen in central China: From oceanic subduction/accretion to continent-continent conllision. Science China-Earth Sciences 2015, 58, 1477 (in Chinese).CrossrefGoogle Scholar

  • [13]

    R. X. Zhang, S. Y. Yang, A mathematical model for determining carbon coating thickness and its application in electron probe microanalysis. Microsc. Microanal. 2016, 22, 1374.CrossrefWeb of ScienceGoogle Scholar

  • [14]

    E. W. Radoslovich, The structure of muscovite, KAl2(Si3Al)O10(OH)2. Acta Crystallogr. 1960, 13, 919.CrossrefGoogle Scholar

  • [15]

    A. Amisano-Canesi, G. Chiari, G. Ferraris, G. Ivaldi, S. V. Soboleva, Muscovite- and phengite-3T: crystal structure and conditions of formation. Eur. J. Mineral. 1994, 6, 489.CrossrefGoogle Scholar

  • [16]

    D. J. Prior, J. Wheeler, L. Peruzzo, R. Spiess, C. Storey, Some garnetmicrostructures: an illustration of the potential of orientation maps and misorientation analysis in microstructural studies. J. Struct. Geol. 2002, 24, 999.CrossrefGoogle Scholar

  • [17]

    G. W. Brindley, G. Brown, Crystal Structures of Clay Minerals and their X-ray Identification, Mineralogical Society Monograph No. 5, Mineralogical Society, London, 1980.Google Scholar

  • [18]

    M. E. Fleet, Micas, Rock-Forming Minerals, Second edition, Volume 3A, (Ed. H. Deer, and Zussman) The Geological Society, London, 2003.Google Scholar

About the article

Received: 2018-10-13

Accepted: 2018-12-13

Published Online: 2019-01-26

Published in Print: 2019-05-27


Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 234, Issue 5, Pages 329–340, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1515/zkri-2018-2139.

Export Citation

©2019 Walter de Gruyter GmbH, Berlin/Boston.Get Permission

Comments (0)

Please log in or register to comment.
Log in