《Table 1 Zircon LA-ICP-MS U-Pb data of tuffie and conglomerate samples from the North Qiangtang depr

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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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In situ zircon Hf isotopic analyses were conducted at the State Key Laboratory of Geological Processes and Mineral Resources，the Chinese University of Geosciences（Wuhan），using a Neptune Plus MC-ICP-MS equipped with a Geo Las 2005 laser-ablation system.Zircon 91500and GJ-1were used as reference standards，with a recommended 176Hf/177Hf ratio of 0.282307±0.000031（2σ）（Wu Fuyuan et al.，2006） and 0.282000±0.000005（2σ）（Morel et al.，2008） ，respectively.Hf isotopic analyses were located on the same（or as close as possible to）spots used for U-Pb dating，with spot sizes of 60μm in diameter.More details on operating and calibration procedures can be found in Hu et al.（2012）.The initial176Hf/177Hf ratio was calculated according to the weighted mean age，and theεHf（t）value was calculated with reference to the chondritic reservoir（CHUR）at the time of the zircon growth from the magmas（ratios of176Hf/177Hf=0.282772 and 176Lu/177Hf=0.0332；BlichertToft and Albarède，1997）.One-stage model ages（TDM）were calculated relative to depleted mantle with a presentday（176Hf/177Hf）DM=0.28325 and（176Lu/177Hf）DM=0.0384（Griffin et al.，2000）.Two-stage model ages（TDM2）were calculated assuming 176Lu/177Hf=0.015 for the average continental crust（Griffin et al.，2002）.Off-line selection and integration of analytical signals were also performed using ICPMSData Cal10.2（Liu et al.，2010）.The Hf isotopic data are listed in Table 2) .