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    Lithium defects and diffusivity in forsterite

    187453_wright.pdf (2.242Mb)
    Access Status
    Open access
    Authors
    Zhang, Feiwu
    Wright, Kathleen
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, Feiwu and Wright, Kate. 2012. Lithium defects and diffusivity in Forsterite. Geochimica Et Cosmochimica Acta 91: pp. 32-39.
    Source Title
    Geochimica Et Cosmochimica Acta
    DOI
    10.1016/j.gca.2012.05.034
    ISSN
    00167037
    Remarks

    NOTICE: this is the author’s version of a work that was accepted for publication in Geochimica et Cosmochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Geochimica et Cosmochimica Acta, Vol. 91 (2012) http://dx.doi.org/10.1016/j.gca.2012.05.034

    URI
    http://hdl.handle.net/20.500.11937/9077
    Collection
    • Curtin Research Publications
    Abstract

    Lithium is an important geochemical tracer used to infer the thermal and chemical evolution of minerals in the Earth’s upper mantle. Knowledge of point defect chemistry and diffusion is critical for the interpretation of Li distribution in minerals. Using quantum mechanical methods we show that in forsterite Li will be incorporated as bound interstitial–substitutional pairs. Furthermore, there will be temperature dependent fractionation of its two isotopes between the different sites. The fractionation decreases dramatically from 87.1& at 300 K to 1.0& at 3000 K. Diffusion is predicted to occur via twointer-related mechanisms: Mg–Li exchange, and a second, vacancy assisted interstitial mechanism. This behaviour is complex, facilitates migration of the heavier isotope and offers insights into observations of Li mobility and zoning in olivine, the most volumetrically important upper mantle mineral.

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