Abstract:Pingdingshan gold deposit is located within the Jiamusi massif and is adjacent to the Songnen massif. Several geophysical methods have been applied in an attempt to constrain the prospecting and significance of vein and pyrite. However, little concern was given over hosting granites which closely related to the Pingdingshan gold deposit. This study carried out the LA-ICP-MS zircon U-Pb ages, coupled with Hf isotopic determination, and measurement of bulk rock major and trace-elements from the hosting granites. The granites in the Pingdingshan gold deposit are composed of earlier light-colored medium-grained monzogranite and slightly later fine-grained biotite monzogranite with zircon U-Pb ages at 271.7±2.3Ma and 249.8±3.3Ma, respectively. The εHf(t) values for these two episodes of magmatism are at -4.17~-0.58 and -4.98~-0.49, which correspond to Hf two-stage model ages of 1432Ma and 1457Ma, respectively, suggesting that their parent magmas derived from the partial melting of Mesooproterozoic crust. Both earlier and later monzogranites are characterized by high Al2O3, K2O+Na2O, LREE and LILE (Rb, Ba, Th, U and K), and low MgO, HREE and HFSE (Nb, Ta, P and Ti). They are chemically high-K calc-alkaline rock series, and represent volcanic arc/ syn-collision I-type granites. Combined with the evolution history of the eastern segment of the Central-Asian Orogenic Belt, we consider that the granites in the Pingdingshan deposit formed from the north-ward subduction, closure of the Paleo-Asian Ocean, and collision of North China Craton with Jiamusi-Mongolia massif.