1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Team 608 of Non-ferrous Metals Geological Prospecting Bureau of Jilin Province, Changchun 130500, China;
3. Jilin Institute of Geological Sciences, Changchun 130012, China;
4. Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China;
5. International Centre for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China

The authors studied the whole-rock geochemical data, zircon U-Pb geochronology and Lu-Hf isotopic compositions for Early Permian monzogranite in the Mianduhe area of the northern Great Xing'an Range, NE China. The dating results show that the monzogranite in the Mianduhe area was formed in Early Permian, with age of 297±2 Ma. Geochemically, these monzogranite are characterized by high silica (SiO₂=67.45%~73.54%) and low Mg^# values(25~42). They are depleted in high field elements (HFSEs, i.e. Nb, Ta, Ti, and P) and enriched in large-ion lithophile elements (LILEs, i.e. Rb, Th and U), suggesting that they belong to high K calc-alkaline I-type granites. Primary zircons from the Early Permian monzogranite have ��_Hf(t) values of +7.5 to+11.9, and Hf two-stage model ages (t_DM2) of 554 Ma to 838 Ma, indicating that the parental magma was generated by the partial melting of a Neoproterozioc accreted crustal source. Combining with previous studies, the authors suggested that the Early Permian monzogranite in the Mianduhe area was formed in a post-collision extensional setting.