《Table 1 LA-ICP-MS U-Pb isotopic analytical data of zircon in Lizhuang nordmarkite》

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《"Zircon U-Pb age, Trace Element, and Hf Isotopic Compositions of Nordmarkite in the Lizhuang Rare Earth Element Deposit in the Western Margin of the Yangtze Block"》

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In situ Hf isotopic analyses of zircons from Lizhuang nordmarkites samples（LZ）are shown in Table 2，and the zircon Hf zircon isotopic data and calculation results are presented in Table 2.Twenty spot analyses were obtained from 20 grains.In general，the 176Lu/177Hf ratios of magmatic domains are<0.002，with an average of0.0012774.This result indicates that time-integrated changes to the 176Hf/177Hf ratio as a result of the in situ decay of 176Lu proceed at virtually negligible rates（Kinny，2003；Yin et al.，2015）.Therefore，zircon effectively preserves the initial 176Hf/177Hf ratio，providing an enduring record of the Hf isotopic composition of its source environment at the time of crystallization.According to the average crystal components（176Lu/177Hf=0.008，Taylor and Mc Lennan，1985）and zircon U-Pb age（28.57±0.61 Ma）to calculate the Hf isotopic model，εHf（t）values，and TDM2，the data show that the magmatic zircons from Lizhuang nordmarkites（28.57±0.61 Ma）have stable Hf isotopic compositions，with initial 176Hf/177Hf ratios ranging from 0.282739 to0.282808 and an average value of 0.282773.The negative Lu/Hf and positiveεHf（t）ranges from-0.98 to-0.94（average value of-0.96）and from-0.56 to 1.89（the majority is positive with an average of 0.66）.The corresponding TDM2 age varies from 989 Ma to 1145 Ma，with an average of 1067 Ma，which indicates that the nordmarkite originates from enriched mantle formed in the Middle Proterozoic.