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    A scanning ion imaging investigation into the micron-scale U-Pb systematics in a complex lunar zircon

    Access Status
    Fulltext not available
    Authors
    Bellucci, J.
    Whitehouse, M.
    Nemchin, Alexander
    Snape, J.
    Pidgeon, Robert
    Grange, Marion
    Reddy, Steven
    Timms, Nicholas
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Bellucci, J. and Whitehouse, M. and Nemchin, A. and Snape, J. and Pidgeon, R. and Grange, M. and Reddy, S. et al. 2016. A scanning ion imaging investigation into the micron-scale U-Pb systematics in a complex lunar zircon. Chemical Geology. 438: pp. 112-122.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2016.05.022
    ISSN
    0009-2541
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/3924
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 Elsevier B.V.The full U-Pb isotopic systematics in a complex lunar zircon 'Pomegranate' from lunar impact breccia 73235 have been investigated by the development of a novel Secondary Ion Mass Spectrometry (SIMS) scanning ion imaging (SII) technique. This technique offers at least a four-fold increase in analytical spatial resolution over traditional SIMS analyses in zircon. Results from this study confirm the hypothesis that the Pomegranate zircon crystallized at 4.302 ± 0.013 Ga and experienced an impact that formed, U-enriched zircon around primary zircon cores at 4.184 ± 0.007 Ga (2s, all uncertainties). The increase in spatial resolution offered by this technique has facilitated targeting of primary zircon that was previously inaccessible to conventional spot analyses. This approach has yielded results indicating that individual grains with a diffusive distance of less than ~. 4 µm have been reset to the young impact age, while individual grains with a diffusive distance larger than ~. 6 µm have retained the old crystallization age. Assuming a broad range in cooling rate of 0.5-50 °C/year, which has been observed in a suite of similar lunar breccias, a maximum localized temperature generated by the impact that reset small primary zircon and created new, high-U zircon is estimated to be between 1100 and 1280 °C.

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