Silicic volcanic rocks are the main components of the upper crust. Understanding their genesis can help us better understand the processes of crustal growth, reconstruction, and crust-mantle interactions. In this study, we examine silicic volcanic rocks from Suolun in the Great Xing'an Range, China. These silicic volcanic rocks are of Cretaceous age (140-123 Ma), with 68-76 wt% SiO 2 , and the majority are of the high-K (calc-alkaline) series. εHf(t) ranges between +1.7 and +9.9, mostly around 7. The Early Cretaceous silicic volcanic rocks from Suolun are cold-wet-oxidised, highly differentiated I-type volcanic rocks, and plagioclase and K-feldspar are the main fractionation phases. T TiZ shows that silicic magma undergoes a reheating process in the magma chamber, which causes the early rheological lock-up magma to reactivate and thus drives it to further differentiation. This process is probably driven by the injection of high temperature magma at depth. The wet upwelling of the Mongol-Okhotsk Oceanic plate in the deep resulted in large-scale magmatism in the area. These results provide a possible explanation for the formation of highly differentiated magmatic rocks and further confirm the evolutionary link between volcanic rocks and plutonic systems.

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