1. College of Earth Sciences��Jilin University��Changchun 130026��China; 2. Yunnan Institute of Geological Survey��Kunming 650216��China; 3. Haigou Gold Mining Company LTD�� ��Antu 133617��Jilin��China

Haigou intrusion��consisting mainly of marginal monzonite and central adamellite��is the direct host rocks of the Haigou gold deposit�� The intrusion is characterized by low Si��high Al and high total alkali�� The rocks are featured by the enrichment of HFSE ( Th��U��Nb��Ta��Hf��Zr) and depletion of LILE�� In the intrusion�� REEs show strong fractionation and enrichment in LREE and unconspicuous anomaly of Eu�� Discriminating diagrams of tectonic setting suggest that the samples locate in volcanic arc�� The comprehensive analysis shows that Haigou intrusion probably make up a small-scale metamorphic core complexes with the surrounding metamorphic rocks of Seluohe group in Meso-Archean�� Considering the zircon SHRIMP U --Pb dating of the Haigou intrusion ( 322 �� 326 Ma) ��the authors suggested that the oceanic plate subduction process to North China plate resulted in crust growth��and the partial melting formed U-bearing kaligranite before the closure of central Asian-Mongolia Ocean and the collision between northern and southern terranes in Early Hercynian�� The Haigou intrusion was related to crust growth process of Dunhua uprise under volcanic arc tectonic setting��