Fig. 9
a, b Cathodoluminescence images of zircon crystals from gneisses #R22 and #R26. White and dashed white circles indicate LA-ICP-MS (given as 206Pb/238U ages) and trace elements analyses, respectively. Labels refer to Tabs. S7 and S8; c, d Zircon U–Pb Concordia plots for the biotite-bearing gneiss e, f Zircon trace element composition. REE patterns are normalized to chondrite values (Sun and McDonough 1989)