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    The geochemical and geochronological implications of nanoscale trace-element clusters in rutile

    82132.pdf (7.339Mb)
    Access Status
    Open access
    Authors
    Verberne, Rick
    Reddy, Steven
    Saxey, David
    Fougerouse, Denis
    Rickard, William
    Plavsa, D.
    Agangi, Andrea
    Kylander-Clark, A.R.C.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Verberne, R. and Reddy, S.M. and Saxey, D.W. and Fougerouse, D. and Rickard, W.D.A. and Plavsa, D. and Agangi, A. et al. 2020. The geochemical and geochronological implications of nanoscale trace-element clusters in rutile. Geology. 48 (11): pp. 1126-1130.
    Source Title
    Geology
    DOI
    10.1130/G48017.1
    ISSN
    0091-7613
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    John de Laeter Centre (JdLC)
    Department of Applied Geology
    Remarks

    Reproduced with permission from the publisher. The published paper may be accessed at: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/48/11/1126/588198/The-geochemical-and-geochronological-implications?redirectedFrom=fulltext

    URI
    http://hdl.handle.net/20.500.11937/82054
    Collection
    • Curtin Research Publications
    Abstract

    © 2020. All rights reserved. The geochemical analysis of trace elements in rutile (e.g., Pb, U, and Zr) is routinely used to extract information on the nature and timing of geological events. However, the mobility of trace elements can affect age and temperature determinations, with the controlling mecha-nisms for mobility still debated. To further this debate, we use laser-ablation-inductively coupled plasma-mass spectrometry and atom probe tomography to characterize the micro- to nanoscale distribution of trace elements in rutile sourced from the Capricorn orogen, Western Australia. At the >20 pm scale, there is no significant trace-element variation in single grains, and a concordant U-Pb crystallization age of 1872 ± 6 Ma (2a) shows no evidence of isotopic disturbance. At the nanoscale, clusters as much as 20 nm in size and enriched in trace ele-ments (Al, Cr, Pb, and V) are observed. The 207Pb/206Pb ratio of 0.176 ± 0.040 (2a) obtained from clusters indicates that they formed after crystallization, potentially during regional metamorphism. We interpret the clusters to have formed by the entrapment of mobile trace elements in transient sites of radiation damage during upper amphibolite facies metamor-phism. The entrapment would affect the activation energy for volume diffusion of elements present in the cluster. The low number and density of clusters provides constraints on the time over which clusters formed, indicating that peak metamorphic temperatures are short-lived, <10 m.y. events. Our results indicate that the use of trace elements to estimate volume diffusion in rutile is more complex than assuming a homogeneous medium.

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