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    Electron backscatter diffraction analysis of zircon: A systematic assessment of match unitcharacteristics and pattern indexing optimization

    Access Status
    Fulltext not available
    Authors
    Reddy, Steven
    Timms, Nicholas Eric
    Eglington, B.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Reddy, Steven M. and Timms, Nicholas E. and Eglington, Bruce M. 2008. Electron backscatter diffraction analysis of zircon: A systematic assessment of match unitcharacteristics and pattern indexing optimization. American Mineralogist. 93 (1): 187-197.
    Source Title
    American Mineralogist
    DOI
    10.2138/am.2008.2658
    Additional URLs
    http://www.minsocam.org
    Faculty
    Department of Applied Geology
    Division of Resources and Environment
    Remarks

    Copyright 2008 Mineralogical Society of America. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/29125
    Collection
    • Curtin Research Publications
    Abstract

    Quantitative microstructural analysis of zircon using electron backscatter diffraction (EBSD) requires a comparison of empirically collected electron backscatter patterns with theoretical patterns or “match units” derived from known crystallographic parameters. There are 23 possible crystallographic data sets for zircon, and associated match units, derived from natural and synthetic zircon and from theoretical calculations over a range of pressures and different rare earth element (REE) compositions. A systematic assessment of these match units has been undertaken by EBSD analysis of each of four zircons from a range of geological environments combined with principal components analysis and self-organizing map networks. Comparison of the different match units shows a systematic relationship across all samples that are related to changes in unit-cell dimensions associated with pressure and compositional variations. Systematic variations in the data generated from 96 EBSD maps, each comprising 10 000 electron backscatter patterns, indicate that match units associated with increasing pressure or REE dopants yield poorer quality EBSD data. The match units from low-pressure, undoped, natural zircon consistently yield the best EBSD results and are recommended for natural zircon EBSD studies irrespective of the zircon source or U content. The results provide a clear strategy for optimizing the acquisition and analysis of EBSD data from zircon from both crustal and mantle sources. In addition, the developed approach to match unit analysis may be applied to all other crystalline materials, potentially optimizing EBSD analyses from a range of materials.

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