1矿区地质背景研究区位于三江北段义敦岛弧带有色、贵金属矿成矿集中区南部,成矿条件优越。而西南三江又是我国重要的有色金属成矿带,铜、铅、锌、银、金、锡等优势资源潜力巨大(侯增谦等,2004)。研究区地层构造线呈南北向,德格—乡城大断裂近南北向纵贯全区。区内主要出露玉树—中甸分区稻城小区的上三叠统地层,由曲嘎寺组、图姆沟组、喇嘛垭组3个岩石地层单位组成。区内岩浆岩出露比较广泛,有分布广 1 Geological Background of Mining Area The research area is located in the southern part of the Yisun Island arc zone colored and precious metal mineralization concentrating area in the northern part of Sanjiang with favorable metallogenic conditions. However, Sanjiang in the southwest is another important non-ferrous metallogenic belt in China. Potential for such advantageous resources as copper, lead, zinc, silver, gold and tin is huge (Hou Zengqian et al., 2004). The stratigraphic line in the study area is north-south direction, and the Dege- The Upper Triassic strata in Yacheng-Zhongdian district, Daocheng district, are mainly composed of three rock strata units of Quagji Formation, Tumugou Formation and Lamaya Formation. The magmatic rocks in the area are more exposed and widely distributed