《Table 2 In-situ Hf isotopic data for zircon grains from the North Qiangtang depression, Tibet》

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《"New Insights into the Late Triassic Nadigangri Formation of Northern Qiangtang, Tibet, China: Constraints from U-Pb Ages and Hf Isotopes of Detrital and Magmatic Zircons"》

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Zircons for LA-MC-ICP-MS U-Pb dating were separated from crushed rock by using conventional heavy liquid and magnetic techniques，and purified by handpicking under a binocular microscope.They weremounted in epoxy resin and polished to half their thickness to expose the core of the grains.To analyze the internal structures of the zircons accurately，and determine domains for dating，cathodoluminescence（CL）images were obtained using an GEOL 7100-Gatan scanning electron microscope at the Beijng Geoanalysis Co.，Ltd.CL images of the analyzed zircon grains are illustrated in Fig.5.U-Pb dating by LA-ICP-MS was performed at the State Key Laboratory of Geological Processes and Mineral Resources，the Chinese University of Geosciences，Wuhan.Laser sampling was performed using a Geo Las2005 System.Helium was used as a carrier gas.An Agilent 7500a ICP-MS instrument was used to acquire ion-signal intensities.Detailed operating conditions for the laser and the ICP-MS instrument can be found in Liu et al.（2008）.Zircon 91500 was used as an external standard for the matrix-matched calibration of U-Pb dating，and was analysed twice every five–eight analyses.NISTSRM 612reference glasses were analyzed as an external standard to calibrate trace element contents.Off-line isotope ratios were calculated by ICPMSData Cal10.2（Liu et al.，2010）.The weighted mean age calculations，concordia diagrams and probability density plots were generated using ISOPLOT 3.7（Ludwig，2012）.Results are presented in Table 1.