随着现代原位分析技术的发展，锡石U–Pb定年方法得人们广泛关注，并用于金属矿床、特别是锡矿床的定年研究。中欧厄尔士山脉锡成矿省一直是国际锡矿成因研究热点区域之一，但其成矿年龄仍存在着较大争议，制约了对矿床形成机制的正确认识。本项申请拟选取厄尔士山脉内八个典型锡矿床中锡石作为研究对象，在系统岩相学和矿相学研究基础上，开展锡石原位U–Pb定年分析，精确限定锡成矿时代；通过系统原位（电子探针、LA-ICP-MS）分析，揭示不同类型矿床锡石的元素地球化学特征，探讨其成矿物质来源，约束其与花岗岩的亲缘关系；将阴极发光研究与原位微量元素分析结合，确定锡石不同生长环带的微量元素地球化学特征，精细刻画成矿过程流体的演化，揭示元素迁移和富集机制及控制因素。本项目研究的实施，不但可以有效地揭示厄尔士山脉不同类型锡矿床的形成机制，而且还能为探究区域成矿规律和指导区域找矿勘探提供重要启示。

Along with the progress of the in-situ analytical techniques, cassiterite U–Pb dating attracted more geologists’ attention and have been used to constrain the timing of mineral deposits especially of tin deposits. Although the Erzgebirge tin province in Central Europe is one of the research hotspots on the tin metallogeny, the timing of tin mineralization event still remains debates, which confines the correct cognition of the ore-forming mechanism. This project will study the cassiterites from eight representative tin deposits in the Erzgebirge, based on detailed petrographic and mineralographic observations: to precisely constrain the timing of tin deposits using in-situ cassiterite U–Pb dating; to confirm the elemental geochemical characteristics of cassiterites from various types of tin deposits, discuss the source of ore materials and refine the genetic relationships with the granites using detailed elemental analyses (EMPA and LA-ICPMS); combined with the CL images and in-situ elemental analysis, to confirm the trace element variations in different cassiterite zonation, to finely depict the fluid evolution of the tin mineralization and figure out the elemental migration/enrichment mechanism and the controlling factors. This research will not only confirm the ore-forming mechanism of various types of tin deposits in the Erzgebirge, but also offer important indications for the regional tin metallogeny and exploration.