Fig. 15

Images and data of zircons separated from a RG2 sample (B20-3247). a–c 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 rims with oscillatory zoning (a and b), the white spot of an inherited core (a), blue spots of zircon centers (b), and the red spot of a domain with blurred zoning (c). d Concordia diagram of all LA-ICP-MS measurements. Data highlighted in green correspond to data shown in subfigure (e) 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. e \({}^{206}\hbox {Pb}/{}^{238}\hbox {U}\)-ages of the potentially respected data for the age determination. Length of 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 rims with oscillatory zoning texture (green), rims with other textures (red) and centers (blue). Inner figure shows a histogram of all \({}^{206}\hbox {Pb}/{}^{238}\hbox {U}\)-ages shown in the main figure