1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. International Centre for Geoscience ��esearch and Education in Northeast Asia��Jilin University��Changchun 130026��China; 3. Institute of Karst Geology��CAGS��Guilin 541004��Guangxi��China; 4. Liaoning Technical University Institute of Mining��Fuxin 123000��Liaoning��China

Granodiorite porphyry and diorite porphyry exposed in the Xianfengbeishan gold deposit�� The authors studied the chronology of the dikes and the tectonic setting�� The results indicate that the granodiorite por- phyry was emplaced in the Early Cretaceous with age of 128. 3 ± 2. 6 Ma��belonging to peraluminous medium- K calc- alkaline I- type granites��and display characteristics of high silicon��alkali and calcium and low magnesium�� They are enriched in light rare earth elements (L��EEs) and large ion lithophile elements (LILEs; e. g�� ��b��Th�� K)��and depleted in heavy rare earth elements (H��EEs) high field strength elements (HFSEs; e. g�� Nb��Ta��P and Ti) with on obvious Eu anomalies�� Meanwhile��the diorite porphyry was emplaced in the Early Cretaceous with age of 113. 2 ±1. 7 Ma��belonging to metaluminous high-K calc- alkaline rocks��and featured by high alkali and magnesium and low phosphorus�� They are characterized by enrichment in light rare earth elements (L��EEs) and large ion lithophile elements (LILEs; e. g�� ��b��Th��K)��depletion in heavy rare earth elements (H��EEs) high field strength elements (HFSEs; e. g�� Nb��Ta��P and Ti) with on Eu anomalies�� Based on the geological data in the Wandashan region��it is proposed that the granodiorite porphyry and diorite porphyry from the Xianfengbeishan were emplaced in a transformation setting from convergence to extension��which was closely related to the subduc- tion of the Paleo- Pacific Oceanic plate and the amalgamation of the Jiamusi and Wandashan blocks��