CL images of representative zircon grains and Tera-Wasserburg diagrams for zircons of sample P10-8 (location in Figs. 4 and 6b). In the upper diagram, empty ellipses correspond to inherited core domains while filled ellipses correspond to internal rim domains. In the lower diagram, external rim domains are plotted together with the analyses of metamict zircons; filled ellipses correspond to data used for calculating the lower-intercept age.