闽中梅仙式铅锌矿床叠加成矿过程精细刻画：基于硫化物原位微量元素及硫同位素的研究

叠加型铅锌矿床在我国十分常见，成矿过程精细化研究对深入认识叠加型铅锌矿床成矿系统具有重要意义。闽中地区是武夷山成矿带中重要的铜铅锌成矿远景区，产出以尤溪梅仙为代表的多个大中型铅锌多金属矿床，统称为梅仙式矿床。梅仙式矿床具有明显的叠加成矿特征，但由于缺乏精细的成矿物质来源及成矿流体演化研究，制约了对梅仙式矿床成矿作用过程的深入认识。本申请拟以梅仙矿田丁家山铅锌多金属矿床内成矿条件完全不同的两类矿石（含磁黄铁矿矿石和含磁铁矿矿石）为研究对象，在详细查明两类矿石空间分布特征的基础上，采用LA-ICP-MS技术，通过黄铁矿和闪锌矿的形貌学、原位微量元素、硫同位素及元素mapping分析，精细限定成矿物质来源、成矿流体组成和演化过程，明确成矿物质迁移富集规律及控制因素，精细刻画叠加成矿作用过程。项目完成将提高叠加型铅锌矿床成矿理论认识，为梅仙式矿床勘查找矿工作提供科学依据。

There are many superimposed lead-zinc deposits in China.The refined study of the metallogenic process is very importent for the in-depth understanding of the superimposed metallogenic system.The central Fujian province is an important copper-lead-zinc mineralization prospect in the Wuyishan metallogenic belt, there are many large and medium-sized lead-zinc polymetallic deposits, and Youxi Meixian is a typical representative of them , so they were be called the Meixian-style deposits.The Meixian-style deposits have obvious superimposed metallogenic characteristics. The mineralization process of them is still not well understanded, largely due to the lack of ystematic understanding on the compositions, origins and evolution histories of the ore-forming fluids...In this proposal, we plan to conduct systematic studies on the Dingjiashan large lead-zinc deposit, which contains two types ore formed at different mineralization. The LA-ICP-MS techniques will be utilized in this study, The morphology and texture, elemental and isotopic composition of pyrites and sphalerite will be obtained, in order to constrain the source of metals, composition and evolution histories of ore-forming fluids，and recognize the migration and enrichment rules and control factors of minerals. Furthermore,we will attempt to well knew the genesis and mineralization process of Meixian-style deposits. The completion of the proposal will improve the understanding of the superimposed mineralization theory system,and provide a scientific basis for the exploration and prospecting of Meixian-style deposits.