北喜马拉雅成矿带东段扎西康铅锌锑多金属矿床方解石微区原位U-Pb年代学及流体包裹体LA-ICPMS地球化学研究

北喜马拉雅成矿带是研究大陆碰撞造山过程与成矿作用关系的理想地区。扎西康矿床是该成矿带中规模最大，最典型的铅锌锑多金属超大型矿床。受传统研究手段的限制，目前对扎西康矿床的成矿时代和成矿过程还存在很不相同的认识，严重制约了成矿理论的建立和相应的找矿勘查部署。近年来，方解石微区原位U-Pb高精度定年和矿物中单个流体包裹体组成测试技术快速发展并得到成功应用，为成矿学研究提供了崭新机遇。本项目拟选择扎西康矿床为对象，在详细的矿物组合、生成顺序、流体包裹体显微观测等研究的基础上，主要采用微区原位测试技术，系统开展与不同期次矿石矿物共生的方解石的U-Pb年代学以及石英和闪锌矿等矿物中不同世代单个原生流体包裹体的组成研究，精确限定扎西康矿床的成矿时代、成矿流体组成、演化特征及其成矿过程。研究成果对揭示矿床的成矿机理及成矿动力学背景，深入认识和完善大陆碰撞造山过程与成矿作用关系的理论体系具有重要意义。

The North Himalayan Metallogenic Belt (NHMB) is the ideal place for studying on the genetic links between collisional processes and ore formation in collisional orogenic belts. Zhaxikang deposit located in the eastern part of NHMB is the biggest and most representative deposit in this belt and characterized by Pb-Zn-Sb mineral association. Due to the restriction of traditional research methods, the metallogenic epoch and ore-forming process of Zhaxikang deposit are still controversial, which severely restrict the establishment of metallogenic theory and deployment of ore prospecting. In recent years, the in-situ U-Pb dating of calcite and compositional analysis of single fluid inclusion developed rapidly and had been applied successfully, which provide a new chance for the study on metallogeny. This project takes the Zhaxikang deposit as the studying objective, based on the researches on the mineral association, paragenesis, microscopic observations of fluid inclusions and so on, the studies of micro area analysis including in-situ U-Pb dating of calcite intergrown with ore minerals, as well as the major and trace elements of single fluid inclusions attributed to different generations in sphalerite and quartz will be systematically carried out, in order to constrain the metallogenic epoch, composition and evolutionary characteristics of ore-forming fluid and mineralization process of this deposit. The research findings have critical implication for revealing the metallogenic mechanism and dynamics, enhancing and perfecting the understanding of relationship between mountain building and mineralization.