西冲钼矿是大别成矿带东段近年新发现的斑岩型钼-多金属矿床,其矿床学和矿床地球化学研究少见报导。该研究成果丰富了我国斑岩-矽卡岩型钼钨-多金属矿床研究成果,同时对指导区域找矿具有一定意义。本文在详细的野外地质调研基础上,对大别成矿带西冲钼矿区出露的主要岩石单元、矿化和蚀变特征、细粒花岗岩的岩石学、岩石化学和成岩年代学进行了系统的研究。结果表明,矿区出露的主要侵入岩单元由老至新依次为:石英二长岩、细粒花岗岩(130.8±1.1Ma)及双峰式脉岩组合(131.9±1.4Ma和131.3±1.6Ma),其均为燕山期岩浆活动产物,产于华北与扬子陆块拼合后的陆内环境。矿化类型以脉状、网脉状和浸染状为主,为一斑岩型钼-多金属矿床。矿区蚀变发育,包括黑云母-磁铁矿化、钾长石化、硅化、石英-绢云母化、石英-绿帘石化、绿泥石-碳酸盐化和泥化,且空间上具有一定的分带规律。矿区已知矿化、蚀变及Cu-Mo化探异常的空间展布与细粒花岗岩关系密切,且细粒花岗岩中具有高的Mo含量,表明该矿床的形成主要与细粒花岗岩有关。岩石化学结果表明,细粒花岗岩属过铝质-准铝质、高钾钙碱性-钾玄质过渡岩石,锆石U-Pb年龄与双峰式脉岩的在误差范围内一致,表明其均形成于大别造山带大规模伸展背景。 The Xichong molybdenum deposit is a newly discovered porphyry molybdenum-polymetallic deposit in the eastern segment of the Dabie metallogenic belt. Its ore deposit and deposit geochemistry are rarely reported. The research results have enriched the research results of porphyry-skarn molybdenum tungsten-polymetallic deposit in China, meanwhile it has some significance for ore prospecting in the area. Based on the detailed field geologic investigation, the paper systematically studied the major rock units, mineralization and alteration features, petrology, petrochemistry and diagenetic chronology of granite granites exposed in the Xi-Chong molybdenum deposit in the Dabie metallogenic belt Research. The results show that the major intrusive rocks exposed in the mining area are quartz monzogranite, granitic granite (130.8 ± 1.1Ma) and bimodal veins (131.9 ± 1.4Ma and 131.3 ± 1.6Ma) , All of which are products of the Yanshanian magmatic activity and are produced in the intracontinental environment after the combination of the North China and the Yangtze Block. The mineralization types are vein, reticulate and disseminated, which is a porphyry molybdenum-polymetallic deposit. The alteration of the mining area includes biotite-magnetite mineralization, potassium feldspathization, silicification, quartz-sericite, quartz-epidote, chlorite-carbonate and mud formation, Zoning rules. The known mineralization, alteration and Cu-Mo geochemical anomaly spatial distribution in the mine area are closely related to fine-grained granite. The high content of Mo in fine-grained granite indicates that the deposit is mainly related to fine-grained granite. The petrochemical results show that fine-grained granitoids are peraluminous-quasi-aluminous, high-K calc-alkaline-potash transitional rocks and zircon U-Pb ages are consistent with bimodal veins in the error range, indicating that Are formed in the Dabie orogenic belt extension of the large-scale background.