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    Zircon U-Pb strain chronometry reveals deep impact-triggered flow

    115570_9201_Moser et al EPSL_AR version.pdf (3.261Mb)
    Access Status
    Open access
    Authors
    Moser, D.
    Davis, W.
    Reddy, Steven
    Flemming, R.
    Hart, R.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Moser, Desmond and Davis, William and Reddy, Steven and Flemming, Roberta and Hart, R. 2009. Zircon U-Pb strain chronometry reveals deep impact-triggered flow. Earth and Planetary Science Letters 277 (1-2): pp. 73-79.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2008.09.036
    ISSN
    0012821X
    Faculty
    Department of Applied Geology
    Science and Engineering
    Remarks

    Copyright © 2009 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/5030
    Collection
    • Curtin Research Publications
    Abstract

    Large (>100km) meteorite impact cratering events play important roles in surface and biosphere evolution, however, their potential for widespread ductile modification of the lithosphere has been difficult to assess, due partly to our inability to isotopically age-correlate deep mineral fabrics with surface records. We have integrated benchmark U-Pb zircon dating methods (ID-TIMS, SHRIMP) with new microstructural techniques (EBSD, XRD) to demonstrate that crystal-plastic deformation can cause rapid out-diffusion of radiogenic Pb and accompanying trace element alteration in crystalline zircon. We have used this phenomenon to directly date fabric in Archean zircons and xenoliths of the lower crust of South Africa at 2023 15 million years, coeval with the 2020 3 million year old Vredefort cratering event at surface, with extent > or =20,000 km2. Our findings indicate that regional exogenic fabrics, similar to high-temperature tectonic fabrics, exist in ancient crust. Moreover, our results establish that crystal-plastic deformation in the lithosphere can now be directly dated and linked to planetary evolution by zircon U-Pb strain chronometry.

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