西藏西部班公湖铁铜多金属矿带的成矿特征与远景评估

Prospect evaluation and metallogenic features of the Bangong Lake Fe-Cu polymetallic mineralization belt in western Tibet,China

班公湖铁铜矿带位于班公湖-怒江构造-岩浆成矿带西段,带内广泛出露的二叠纪海相碳酸盐岩是成矿极为有利的地层,沿该带侵入于二叠纪至三叠纪地层中的晚侏罗世—早白垩世花岗闪长岩、花岗岩则是成矿有利的岩浆岩。横贯区内的班-怒结合带(北西西向)及与之伴生的次级北东向、北西向、南北向断裂,以及接触带构造、层间破碎带构造为成矿物质迁移富集提供了良好的容储空间。航磁异常显示为一级找矿远景区,成矿条件有利,铁铜矿资源潜力较大。在分析1∶25万喀纳幅、日土县幅、羌多幅区调工作成果的基础上,结合近年来的地质勘查新成果,初步分析了班公湖地区的成矿地质特征,并在班公湖矿带内划分出6个成矿远景区。

The Bangong Lake Fe-Cu polymetallic mineralization belt is located in the western part of the Bangong Lake-Nujiang PAver structural and magrnatic mineralization area where Permian marine carbonate rocks widely occur as highly advantageous orebeating stratum, Upper Jurassic to Lower Cretaceous granodiorite and granite bodies intruded into the Permian and Triassic strata, which are quite favorable magmatic mother rock. kegional structures which provide proper hosting and storing space for migration and concentration of ore-fornming material include NWW-trend Bangong -Nujiang suture zone traversed the study area and subordinary NE, NW and SN-trend fractures as well as minor structures in contact belt and interlayer fracture zone. It is indicated by aeromagnetic anomalies research that it is a Level 1 prospecting area with beneficial mineralization conditions and great potential for Fe-Cu resources. Based on analysis for regional geologic survey of 1：250000 scale Kana, PAtu County and Qiangduo sheet, together with recent exploration breakthrough, this paper has resulted into preliminarily discussion of ore-forming characteristics of the Bangong Lake area and delineated six promising zones within this area.