Fig. 4From: Paleocene metamorphism along the Pennine–Austroalpine suture constrained by U–Pb dating of titanite and rutile (Malenco, Alps)Schematic illustration of the effect of different common Pb compositions on the isochron defined by data uncorrected for common Pb on a a Tera-Wasserburg and b Wetherill concordia diagram. Isochrons through a hypothetical array of data with the same age but a range of Pb*/PbC are shown. For each plot, two isochrons with the same crystallization age but different common Pb compositions are shown. a On the Tera-Wasserburg concordia, the common Pb composition is given by the y-intercept of the isochron, while b on the Wetherill, it is the slope of the isochron that relates to the common Pb composition. See text for discussionBack to article page