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    Zircon M257 - a homogeneous natural reference material for the ion microprobe U-Pb analysis of zircon

    Access Status
    Fulltext not available
    Authors
    Nasdala, L.
    Hofmeister, W.
    Norberg, N.
    Mattinson, J. M.
    Corfu, F.
    Dörr, W.
    Kamo, S. L.
    Kennedy, Allen K.
    Kronz, A.
    Reiners, P. W.
    Frei, D.
    Kosler, J.
    Wan, Y.
    Götze, J.
    Häger, T.
    Kröner, A.
    Valley, J. W.
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Nasdala, Lutz and Hofmeister, Wolfgang and Norberg, Nicholas and Mattinson, James M. and Corfu, Fernando and Dörr, Wolfgang and Kamo, Sandra L. and Kennedy, Allen K. and Kronz, Andreas and Reiners, Peter W. and Frei, Dirk and Kosler, Jan and Wan, Yusheng and Götze, Jens and Häger, Tobias and Kröner, Alfred and Valley, John W. 2008. Zircon M257 - a homogeneous natural reference material for the ion microprobe U-Pb analysis of zircon. Geostandards and Geoanalytical Research 32: pp. 247-265.
    Source Title
    Geostandards and Geoanalytical Research
    DOI
    10.1111/j.1751-908X.2008.00914.x
    Additional URLs
    http://www3.interscience.wiley.com/cgi-bin/abstract/121427453/ABSTRACT
    ISSN
    16394488
    Faculty
    School of Science and Computing
    Faculty of Science and Engineering
    Department of Imaging and Applied Physics
    Remarks

    Copyright © 2008 John Wiley & Sons, Ltd.

    URI
    http://hdl.handle.net/20.500.11937/47515
    Collection
    • Curtin Research Publications
    Abstract

    We introduce and propose zircon M257 as a future reference material for the determination of zircon U-Pb ages by means of secondary ion mass spectrometry. This light brownish, flawless, cut gemstone specimen from Sri Lanka weighed 5.14 g (25.7 carats). Zircon M257 has TIMS-determined, mean isotopic ratios (2s uncertainties) of 0.09100+_ 0.00003 for 206pb/238U and 0.7392+_0.0003 for 207pb/235U. Its 206pb/238U age is 561.3+_0.3 Ma (unweighted mean, uncertainty quoted at the 95% confidence level); the U-Pb system is concordant within uncertainty of decay constants. Zircon M257 contains ~ 840 μg g-1 U (Th/U ~ 0.27). The material exhibits remarkably low heterogeneity, with a virtual absence of any internal textures even in cathodoluminescence images. The uniform, moderate degree of radiation damage (estimated from the expansion of unit-cell parameters, broadening of Raman spectral parameters and density) corresponds well, within the "Sri Lankan trends", with actinide concentrations, U-Pb age, and the calculated alpha fluence of 1.66 x 1018 g-1. This, and a (U+Th)/He age of 419+_9 Ma (2s), enables us to exclude any unusual thermal history or heat treatment, which could potentially have affected the retention of radiogenic Pb. The oxygen isotope ratio of this zircon is 13.9%o VSMOW suggesting a metamorphic genesis in a marble or calc-silicate skarn.

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