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1地质概况研究区隶属于三江成矿带,大地构造位置位于羌塘—三江陆块次级的南羌塘—左贡区。区域地层主要为上三叠统的竹卡群、阿都拉组、甲丕拉组,下白垩统的景星组以及上白垩统的南新组,地层从奥陶系到白垩系断续出露。区域内构造发育,主要有2条近南北向断层。岩浆岩主要为燕山早期的二长花岗岩和花岗闪长岩,其中花
1 Geological Survey The study area belongs to the Sanjiang metallogenic belt and its tectonic location is located in the southern Qiangtang-Zuo Gong sub-region of the Qiangtang-Sanjiang block. The regional strata are mainly composed of the Upper Triassic Zhuka Group, Abdullah Formation, Methopira Formation, Lower Cretaceous Jingxing Formation and Upper Cretaceous Nanxinc Formation. The strata are discontinuous from Ordovician to Cretaceous dew. Within the region structure development, there are two main north-south fault. The magmatic rocks are mainly early monzonitic granite and granodiorite in Yanshan, of which the flowers