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    Detecting micro- and nanoscale variations in element mobility in high-grade metamorphic rocks: Implication for precise U-Pb dating of zircon

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    Fulltext not available
    Authors
    Kusiak, M.
    Wilde, Simon
    Wirth, R.
    Whitehouse, M.
    Dunkley, Daniel
    Lyon, I.
    Reddy, Steven
    Berry, A.
    De Jonge, M.
    Date
    2017
    Type
    Book Chapter
    
    Metadata
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    Citation
    Kusiak, M. and Wilde, S. and Wirth, R. and Whitehouse, M. and Dunkley, D. and Lyon, I. and Reddy, S. et al. 2017. Detecting micro- and nanoscale variations in element mobility in high-grade metamorphic rocks: Implication for precise U-Pb dating of zircon. In Geophysical Monograph Series, 279-291.
    Source Title
    Geophysical Monograph Series
    DOI
    10.1002/9781119227250.ch13
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/69104
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 American Geophysical Union. Reliable geochronology is fundamental to our understanding of planetary evolution and the geological events that have shaped the Earth. Zircon has a robust crystal structure and is a key mineral in geochronological studies because it incorporates small amounts of actinides during growth. Currently, the best physical evidence for the presence of differentiated crust in the first 500 million years of the Earth’s history comes from intra-grain isotopic microanalysis of zircon crystals. However, it has been long recognized that isotope systematics in zircon can show great complexity, not only from the presence of multiple stages of growth in single grains, but also from disturbance of accumulated radiogenic Pb during subsequent geological events. Although geochronologists are aware of the problem of Pb mobilization during metamorphism, the nature of mobilization on a submicron scale is not entirely understood, especially where evidence has emerged of inhomogeneity and unsupported radiogenic Pb migration. The recent discovery of nanospheres of metallic radiogenic Pb in zircon from granulites explains, in part, instances of reversely discordant age measurements and irregular counts on Pb isotopes during analysis by secondary ion mass spectrometry (SIMS). Studies are continuing to reveal the nature of Pb nanospheres, so that possible mechanisms and conditions requisite for their formation can be proposed for testing by future investigations.

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