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.

References

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.