铁格隆南超大型铜矿床斑岩-浅成低温热液成矿作用套叠机制:来自流体包裹体及黄铁矿原位分析的制约

铁格隆南是西藏首个具有高硫化浅成低温热液成矿作用特征的中生代超大型铜（金、银）矿床，填补了青藏高原该类矿床的空白，并很好的保存了斑岩与高硫化型浅成低温热液成矿作用套叠的现象，为两者套叠共存机制研究提供了良好实例。本项目拟在精细解剖铁格隆南矿床矿化和蚀变结构的基础上，结合已有高精度年代学成果，详细划分成矿作用阶段。通过对不同成矿阶段流体包裹体的温、压测算和单个包裹体原位分析，揭示成矿作用套叠时成矿流体的物理、化学条件和流体成分的演化过程；同时，对不同成矿阶段黄铁矿进行原位成分分析，查明从斑岩至浅成低温热液成矿作用转换过程中，铜的迁移和富集机制；此外，利用不同阶段的石英原位氧同位素和黄铁矿原位硫同位素分析，反演成矿物质来源及成矿流体的演化过程。最终，探究斑岩-浅成低温热液成矿作用的套叠共存机制，深化该类矿床成矿机理研究，丰富斑岩成矿系统理论。

Tiegelongnan, as the first Mesozoic giant Cu(Au, Ag) deposit with high-sulfidation epithermal mineralization in Tibet, preserved porphyry mineralization telescoped by the HS-epithermal mineralization,rarely. It provides a good example for studying the telescoped mechanism of these two kinds of mineralization. Based on the detailed study of the mineralization and alteration structure, high-precision geochronology, this project intends to subdivide the mineralization stage or sub-stage, subtly. Do the detailed T, P analysis and LA-ICP-MS or SR-XRF mapping of individual fluid inclusions from different mineralization stage to explore the evolution of ore-forming fluid from porphyry to HS-epithermal mineralization. Furthermore, the migration and enrichment mechanism of copper from porphyry to epithermal mineralization will be revealed in detail, according to the in-situ analysis of pyrite in different stages. At the same time, the in-situ oxygen and sulfur isotope analysis of quartz and pyrite, respectively, will help to explore ore-forming source and fluid evolution process. Finally, the project will reveal the telescoped mechanism of porphyry and HS-epithermal mineralization in Tiegelongnan deposit, systematically, innovating the metallogenic mechanism study and promoting the theory of porphyry mineralization system.