Fig. 5
Description and U–Pb LA-ICPMS results on the Prarion metavolcano-sedimentary rock AR982. A Photo of the sample AR982 showing distinct Kfs-Pl-Qtz and Amph-rich layers. B Thin section images of the a Kfs-Pl-Qtz layer showing presence of small dihedral angles of interstitial phases (orange arrow), quartz filling pores (yellow arrows), and elongated interstitial plagioclases grains (blue arrow) that indicate a partial melting event (Lee et al., 2018; Stuart et al., 2018). Amph: amphibole; Bt: biotite; Kfs: K-feldspar; Pl: plagioclase; Ttn: titanites. C Cathodoluminescence photos of zircons with locations of laser spots and associated 206Pb/238U dates. D Zircon U–Pb Tera Wasserburg diagram. Dotted ellipses are not taken into account for the calculation of the weighted average of 206Pb/238U age of the two populations (grey and yellow ellipses) because they are affected by radiogenic Pb losses and/or common Pb contaminations. Error ellipses and uncertainties in ages are ± 2σ. E Diagrams of the weighted average 206Pb/238U age of the two populations (grey and yellow). Uncertainties in dates and ages are ± 2σ