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

I.R. Fletcher, Neal Mcnaughton, J.A. Aleinikoff, Birger Rasmussen, S.L. Kamo

    Research output: Contribution to journalArticlepeer-review

    113 Citations (Scopus)

    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 similar to1 % 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. (C) 2004 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)295-314
    JournalChemical Geology
    Volume209
    Issue number3-4
    DOIs
    Publication statusPublished - 2004

    Fingerprint

    Dive into the research topics of 'Improved calibration procedures and new standards for U-Pb and Th-Pb dating of Phanerozoic xenotime by ion microprobe'. Together they form a unique fingerprint.

    Cite this