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    Improved calibration procedures and new standards for U–Pb and Th–Pb dating of Phanerozoic xenotime by ion microprobe

    Access Status
    Fulltext not available
    Authors
    Fletcher, Ian
    McNaughton, Neal
    Aleinikoff, J.
    Rasmussen, Birger
    Kamo, S.
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Fletcher, Ian R. and McNaughton, Neal J. and Aleinikoff, John A. and Rasmussen, Birger and Kamo, Sandra L. 2004. Improved calibration procedures and new standards for U–Pb and Th–Pb dating of Phanerozoic xenotime by ion microprobe. Chemical Geology. 209 (3-4): pp. 295-314.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2004.06.015
    ISSN
    00092541
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/35559
    Collection
    • Curtin Research Publications
    Abstract

    Xenotime is a widely occurring mineral that is amenable to U–Pb and Th–Pb dating but often is found as micrometre-sized crystals that can only be dated by in situ microanalytical techniques. Determining accurate ages for Phanerozoic samples, and assessing concordance in older samples, requires accurate determination of Pb/U and Pb/Th; however, ion microprobe data for these ratios are affected by the highly variable trace element composition of xenotime. We have identified calibration procedures, including matrix corrections for the effects of the dominant trace elements U, Th and REE, that provide an accuracy of ~1% for Pb/U and <2% for Pb/Th. Several new standard samples are available that cover a range of compositions, permitting better matching of samples with standards as well as giving control of the matrix effects. However, no chemically homogeneous samples have been identified.

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