College of Earth Sciences, Jilin University, Changchun 130061, China

The authors undertook zircon LA-ICP-MS U-Pb dating and studied the granite porphyry in geochemistry in Chenjiadian gold deposit of Heilongjiang. The age dating results show that the zircons from the granite porphyry yielded a ²⁰⁶Pb/²³⁸U weighted mean age of (227±4)Ma. The geochemical characteristics of granite porphyry show that it is enriched in Si, Al and alkali, but depleted in Mg and Ca. The trace elements for granite porphyry are obviously enriched in HFSE (Th, Rb, K) and depleted in LILE (Ba, Sr, Ti), and rare elements show LREE-enriched, HREE-depleted, strong fractionation of LREE/HREE ([La/Yb]_N=0.47~4.99) and strong negative anomaly of Eu (��Eu=0.08~0.68). The discrimination diagrams indicate the granite porphyry is characterized by post-collision, which formed in post-collisional tectonic setting. Comprehensive results show the granite porphyry belongs to granite in S-type, formed in the orogenic setting of continental-continental collision after the closure of Paleo-Asian Ocean in Late Triassic. The Chenjiadian gold deposit is located in volcanic arc tectonic belt belongs to the Andean continental margin.