Crustal evolution of the Jiaobei terrane: Evidence from U-Pb ages, trace element compositions and Hf isotopes of inherited zircons of the Linglong biotite granite

The Late Jurassic Linglong biotite granite exposed widely in the Jiaobei terrane, was derived by partial melting of the lower crust, with a lot of inherited zircons witnessed multiplethermal events. These inherited zircon grains can provide important clues for the complex crust evolution. Inherited zircons in the Linglong biotite granite are selected for U-Pb dating, trace element and Hf isotopic compositions analysis to explore the crust evolution of the Jiaobei terrane. We recognize that two period of the crustal growth events took place at similar to 2.9Ga and similar to 2.7Ga, and two episodic crust reworking occurred at similar to 2.5Ga and 2.2 similar to 1.8Ga, and two distinctively metamorphic events occured at similar to 2.5Ga and 1.95 similar to 1.8Ga, respectively. The similar to 2.9Ga magmatism was likely generated in an island-arc system, the similar to 2.7Ga magmatic activity was related to partial melting of the lower crustal mafic rocks, and the similar to 2.5Ga magmatic and metamorphic events were linked to the underplating of mantle plumes, contemporanously, the supracrustal sequence of the Jiaodong Group were deposited. The bimodal magmatism formed at similar to 2.1Ga, suggested a crustal extention event and might be related to rifting, and consequently, the Paleoproterozoic sedimentary rocks of the Jingshan Group and the Fenzishan Group formed. All the Early Precambrian lithological unites in the Jiaobei terrain were metamorphosed during 1.95 similar to 1.8Ga. Since then, there was no tectothermal event until the Permian, but sedimentation occurred at similar to 1.7Ga and similar to 1.0Ga, corresponding to the formation of the Zhifu Group and the Penglai Group, respectively. At the end of the Permian, the Yangtze Block subducted northward beneath the North China Craton. The Triassic continent-continent collision between the North China Craton and The Yangtze Block led the Neoproterozoic granites in the northern margin of the Yangtze Block to experience the ultra-high pressure metamorphism, formed the Sulu UHP metamorphic belt, and then the exhumation of UHP metamorphic rocks occurred. The complex composition of inherited zircons from the Linglong biotite granite may indicate that the Precambrian rocks were involved in the continental collision events and were recycled.