Fig. 12

Images and data of zircons separated from a RG1 sample (B19-1417). a–d CL-images, circles show LA-ICP-MS spots and numbers next to it show the corresponding \({}^{206}\hbox {Pb}/{}^{238}\hbox {U}\)-age with one standard error (in brackets). Green spots indicate LA-ICP-MS measurements of domains with oscillatory zoning (a and b), white spots of domains with ‘spongy texture’ (c), and blue spots of domains with blurred zoning or homogeneous texture (d). e Concordia diagram of all LA-ICP-MS measurements (inner figure) and a close-up view up to 500 Ma (main figure). Data highlighted in green correspond to data shown in subfigure (f) and are potentially respected for the age determination. Data points with indications of inherited cores are marked in yellow. Basis for discarding additional data (non-filled error ellipses) is indicated in Additional file 4. Error ellipses correspond to two standard errors. f \({}^{206}\hbox {Pb}/{}^{238}\hbox {U}\)-ages of the potentially respected data for the age determination. Length of the bars correspond to two standard errors. For the determination of the mean age and the age range, the brightened age data were discarded based on a modified version of Chauvenet’s criterion (Vermeesch, 2018). Colors indicate different textures, which correspond to colors in CL-images. Inner figure shows a histogram of all \({}^{206}\hbox {Pb}/{}^{238}\hbox {U}\)-ages shown in the main figure