ComPbCorr is an Excel template which corrects U-Pb analyses of zircons or other minerals used in geochronology for common lead. The algoritm used does not require data for 204Pb, nor is ideal concordance assumed. The method is informally known as the "Discordance correction", because it uses the discorance pattern in U-Th-Pb isotope space to estimate the amout of common lead present.

    The discordance correction method is designed for correction of quadrupole LAM-ICPMS data, or data from other methods which do not report 204Pb. If 204Pb has been measured, a traditional common-lead correction should be used.



    Andersen, T. 2002. Correction of common lead in U-Pb analyses that do not report 204Pb. Chemical Geology 192, 59-79.

    Ludwig, K. 2001. Isoplot/Ex, rev. 2.49. A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication No. 1a.

    Stacey, J.S. and Kramers, J.D. 1975. Approximation of terrestrial lead isotope evolution by a two-stage model. Earth and Planetary Science Letters 26, 207-221.


A full description of the method is published in Chemical Geology (Andersen 2002)


The template can be obtained by request to the author (