闪锌矿流体包裹体及微区分析对内蒙古少郎河矿田铜-铅锌-银矿化分带机制的制约

A series of vein-type magmatic hydrothermal Cu-Pb-Zn-Ag and other polymetallic deposits occur in the Da Hinggan Mountains and adjacent region, however, studies devoted to multi-stage fluid evolution and multi-metal precipitation mechanism are rather limited. Shaolanghe ore field in Inner Mongolia is a late Paleozoic polymetallic ore field hosting vein-type magmatic hydrothermal Cu-Pb-Zn-Ag deposits, and is characterized by distinct mineralization zoning from east to west. Sphalerite is their common metallic mineral, and its fluid inclusion microthermometry, SEM-BSE imaging, EPMA, microprobe analysis of trace element and sulfur isotope will be applied to monitor the systemic changes of physicochemical condition, material composition and source of ore-forming fluids. Combining comparisons of those data acquired, we could discuss the mechanism of mineralization zoning. This program has significant scientific meaning to delicate studies of magmatic-hydrothermal system and mineralization in the region, it can be also provides valuable guidance for future exploration work of similar deposits.

大兴安岭及邻区发育大量的岩浆热液脉型铜铅锌银等多金属矿床，前人对该地区多金属成矿系统多阶段流体演化和不同金属元素分阶段沉淀机制缺少精细研究。内蒙古少郎河矿田是一个富集热液脉型铜、铅锌和银矿的晚古生代多金属矿田，矿田内自东向西发育铜-铅锌-银矿化分带。本申请拟对矿田内不同矿化类型和成矿期次的贯通性矿石矿物闪锌矿开展流体包裹体测温、SEM-BSE图像、电子探针、原位微区微量元素和硫同位素等测试分析，精细刻画成矿流体演化过程中的物化条件、物质组分和流体来源，厘定矿化分带机制。本申请将对岩浆热液多金属成矿系统理论和区域成矿作用研究具有重要科学意义，并对区内同类型矿床的找矿勘查工作具有重要借鉴意义。

内蒙古少郎河矿田是一个富集热液脉型铜、铅锌和银矿的晚古生代多金属矿田，矿田内自东向西发育铜-铅锌-银矿化分带。本项目立足于矿化分带机制研究，按计划书进行了三年的研究工作，完成了既定目标，取得了相应研究成果：（1）建立了少郎河矿田的矿化-脉系-蚀变演化序列和空间分带；（2）通过闪锌矿包裹体和微区分析，精细刻画少郎河矿田岩浆热液多金属成矿系统的流体演化过程，探讨其矿化分带机制，对岩浆热液多金属成矿系统理论和区域成矿作用研究具有重要科学意义，并对区内同类型矿床的找矿勘查工作具有重要借鉴意义；（3）对区域其他铅锌矿和成矿元素富集机制等进行相关研究；（4）本项目资助发表与研究有关的2篇国际SCI论文。