青海三江北段多日茸铅锌多金属矿床地质特征

Geological characteristics of lead and zinc polymetallic deposit of Duo rirong in the northern Sanjiang area,Qinghai province

三江成矿带北段治多-玉树地区显示出较大的铅锌铜多金属矿成矿潜力。本文在前人研究的基础上,进行了详细的野外地质观测、专项地质填图和钻孔岩芯编录,岩相学观察和硫化物Pb同位素测试,总结了多日茸地区地质背景、矿床地质和化探异常特征,分析其控矿因素和找矿标志,试图为下一步开展找矿工作提供依据。研究结果表明构造作用不仅为岩浆及成矿热液提供运移通道,更提供了必要的容矿空间,深部岩浆房提供了大量的成矿物质及部分成矿流体,围岩蚀变和地球化学标志为最重要的找矿标志,研究区北部具有寻找铜多金属矿潜力,而南部具有寻找热液型铅锌钼矿潜力。

The Zhiduo-Yushu area in the northern Sanjiang metallogenic belt shows great metallogenic potential of lead,zinc and copper polymetallic deposits.On the basis of predecessors’research,this article has carried on the detailed field geological observation,special geological mapping,drilling core logging,petrographic observation,Pb isotope feature of suflides,summarized regional geological background,ore deposit geology,geochemical anomaly characteristics and analyzed its ore-controlling factors and prospecting marks,providing a certain basis for the next step prospecting work.The results show that tectonism not only provides migration channels for magma and ore-forming hydrothermal fluids,but also provides necessary ore-bearing space.Deep magma room provide a large amount of ore-forming materials and partial ore-forming fluids.Surrounding rock alteration and geochemical signs are the most important signs of prospecting.The northern part of the study area has the potential to search for copper polymetallic deposits,while the southern part has the potential to search for hydrothermal Pb-ZnMo deposits.