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Permian lateral crustal growth and reworking along the Solonker suture zone (North China) constrained by high εHf(t) igneous rocks

High εHf(t) intermediate‐felsic rocks have been found in some world‐famous orogenic belts and are considered as one useful proxy for modelling crustal growth. In contrast, low εHf(t) felsic rocks are generally derived from reworked ancient crust. In this study, we identified some Permian high zircon εHf(t) andesite, rhyolite, granodiorite and quartz diorite along the Solonker suture zone. The andesite (270 ± 3 Ma) shows high‐zircon εHf(t) (+4.7 to +7.9) and high‐Mg (Mg# = 42–75) values, high Sr contents (263–401 ppm) and Sr/Y ratios (13–24), akin to typical high‐Mg andesite, and are derived from a metasomatised source modified by the slab‐derived fluid/melt. The rhyolites (282 ± 2 Ma and 279 ± 2 Ma) show positive εHf(t) values (+3.4 to +14.9) and I‐type granite affinity. The granodiorite (295 ± 3 Ma) and quartz diorite (285 ± 1 Ma) are also characterised by high εHf(t) values, high‐K calc‐alkaline and I‐type granitoid compositions, but high A/CNK values (1.08–1.47) and CIPW‐normative corundum (1.61–5.56 vol%), due to late‐alteration induced low Na2O + K2O contents. The I‐type rhyolite and granitoid may have been formed by dehydration melting of sub‐alkaline meta‐basalts (mafic lower crust). The high‐Mg andesite, I‐type rhyolite and granitoids in this study were generated in a continental arc setting related to the Permian divergent double subduction of the Paleo‐Asian Ocean. The high εHf(t) Elitu andesites represent the lateral juvenile continental crust, and high εHf(t) felsic rocks represent mafic‐lower continental crust reworking.