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    Nanoscale processes of trace element mobility in metamorphosed zircon

    Access Status
    Fulltext not available
    Authors
    Peterman, E.M.
    Reddy, Steven
    Saxey, David
    Fougerouse, Denis
    Snoeyenbos, D.R.
    Rickard, William
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Peterman, E.M. and Reddy, S.M. and Saxey, D.W. and Fougerouse, D. and Snoeyenbos, D.R. and Rickard, W.D.A. 2019. Nanoscale processes of trace element mobility in metamorphosed zircon. Contributions to Mineralogy and Petrology. 174 (11): Article No. 92.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-019-1631-1
    ISSN
    0010-7999
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    John de Laeter Centre (JdLC)
    URI
    http://hdl.handle.net/20.500.11937/79364
    Collection
    • Curtin Research Publications
    Abstract

    © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. Several examples of zircon grains from high- to ultrahigh-pressure (UHP) and ultrahigh-temperature (UHT) metapelites exhibit a characteristic, yet atypical, core–rim interface domain < 5-μm wide observed in cathodoluminescence (CL) imaging. The interface domain is located immediately against the magmatic core and is comprised of an irregular, 0–2-μm wide, CL-dark domain that is rimmed by a complex, 0–5-μm wide, CL-bright domain with cuspate margins. The outer margin of the interface domain is rimmed by intermediate-CL zircon with low contrast zoning. To characterize the nature of the interface domain and to identify mechanisms of trace element mobility in metamorphosed zircon, we analyzed several specimens prepared from zircon from the Rhodope Metamorphic Complex (eastern Greece) and the Goshen Dome (western Massachusetts, USA) via atom probe tomography (APT). The data reveal three types of geochemical anomalies, each with a unique morphology. (1) Toroidal clusters with high concentrations of Pb (+ Y, Al) are found exclusively within the core of the Rhodope grain. These clusters are interpreted as decorated dislocation loops that formed during metamorphism and annealing of radiation damage to the lattice. Geochronological and geochemical data support this interpretation. (2) Complex, cross-cutting planar and linear features with anomalous concentrations of Y + P + Yb or U are spatially restricted to the core–rim interface domain; these features do not correlate with inherited geochemical variation (oscillatory zoning) or deformation-induced microstructures. Instead, the planar features likely formed in response to an interface-coupled dissolution–reprecipitation reaction that propagated into the crystal during metamorphism. The observed cross-cutting relationships are the product of either multiple events or complexity of the process that originally formed the domains. (3) Ellipsoidal features with high concentrations of Y + P + Yb (+ Al) are found exclusively within the high-Y + P + Yb planar features. These features are interpreted as the product of spinodal decomposition that occurred during exhumation as the zircon passed the solvus where local equilibria favored nm-scale exsolution to minimize the Gibbs free energy. The presence of multiple types of geochemical features in these examples indicates that trace element mobility in zircon is driven by multiple processes over the course of orogenesis. Given that these atypical domains are apparently restricted to zircon metamorphosed at UHT and (U)HP conditions, their presence may represent a marker of metamorphism at very high-grade conditions.

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