Xiaoqinling is an important distribution area of the Early Precambrian basement in the southern margin of the North China Craton. In this area, a great number of basement rocks were tectonically uplifted to the surface. The Taihua complex is the most ancient geological unit in the Xiaoqinling area, and therefore has great significance in understanding the formation and evolution of the early crust at the southern margin of the North China Craton and constraining its tectonic affinity. This complex in this area can be usually divided into two tectonic units, including orthogneisses and supracrustal rocks. The supracrustal rocks are dominated by khondalite series. Zircon U-Pb dating of a biotite plagiogneiss from the Taihua complex indicates that the magmatic grains were formed at 2.40～2.11 Ga whereas the metamorphic grains yielded two upper intercept ages at ～2.04 Ga and ～1.91 Ga, respectively. This suggests that the paragneiss have an Early Paleoproterozoic provenance and experienced two Middle Paleoproterozoic metamorphic events after deposition. Therefore, the deposition age of the paragneiss is defined between 2.11 Ga and 1.91 Ga. Combined with the zircon Hf isotopic compositions, we suggest that the clastic materials of the supracrustal rocks were mainly derived from granitic plutons of the Sushui and Jiangxian complexes, the Xiong’er granitic pluton and the Xiaoqinling Paleoproterozoic granitic pluton. The primitive crustal materials of the supracrustal rocks were probably originated from the Neoarchean orthogneisses of the Taihua complex. In addition, this study reveals that a continuous subduction collision course of about 250 Ma（～2.05～1.8 Ga）may be recorded in the orogenic belt in central North China.
Wang Jingyu Long Xiaoping Li Zhenhua He Yanhong Yang Xiaoxiao. Detrital zircon U-Pb geochronology and Hf isotopic compositions of paragneiss rocks in the Xiaoqinling Taihua complex, southern margin of North China Craton[J]. Chinese Journal of Geology, 2018, 53(3): 1027-1053.