| Citation: | Zhengzhe Fan, Xian Chen, Dehui Zhang, Hongqi Yuan. Mechanism of Crust Growth Constrained by Back-Calculated U/Pb Ratios of the New Continental Crust. Journal of Earth Science, 2025, 36(5): 1892-1905. doi: 10.1007/s12583-023-1830-6
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The mechanism of continental crust growth remains ambiguous. A key constraint is determining which tectonic settings were involved in the formation of the new continental crust. Because the basalts formed in intraplate (OIB, mean U/Pb = ~0.37 ± 0.11) and subduction (IAB, mean U/Pb = ~0.10 ± 0.06) settings have distinct U/Pb ratios, thus we back-calculate the present-day U/Pb ratios of the New Continental crust source [(U/Pb)nc] based on our zircon-Hf and published whole rock-Pb isotope compositions of the Wulaga Ⅰ-type granite to unfold the mechanism of the crust growth in the Lesser Xing'an Range (LXR), of the eastern Central Asian orogenic belt (CAOB). The Wulaga granodiorite porphyry yields zircon U-Pb ages of 103 ± 1 Ma with
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