Fig. 12

U–Pb zircon geochronology of paragneiss samples PG3 (a–c) and PG41 (d–f). a, d CL images of zircon. Dashed orange circles indicate the position of the LA-ICP-MS spots analysed for U–Pb ages. b, e Detrital zircon age distribution represented with Kernel density estimate (KDE). Individual dates are represented with empty cycles at the base of the diagram. c, f Th/U ratio versus age plot. Distinction between magmatic versus metamorphic zircon based on Th/U ratio is according to Teipel et al. (2004)