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通过对金顶超大型铅锌矿床的砂岩型矿石和角砾岩型矿石较为系统的岩相学、电子探针、扫描电镜和能谱分析,初步揭示了黑色不透明物质为赋载成矿物质的主体,其本质为不均匀混溶硫化物和硅酸盐的碳酸盐熔浆快速冷凝的超显微隐晶固体,是地幔流体作用的现实微观踪迹。结合矿石矿物铅同位素组成的壳幔混染渐变特点及流体包裹体稀有气体同位素组成的壳幔混合特征进行的综合研究表明,与富碱岩浆成岩成矿背景相关的地幔流体自身携带成矿物质沿深大断裂向上运移并以交代蚀变引发壳幔混染叠加的方式参与地壳中的成矿作用,这是形成金顶超大型铅锌矿床的重要地球化学机制。
Through systematical petrography, electron probe, scanning electron microscopy and energy spectrum analysis of the sandstone-type ores and breccia-type ores in the Jinding ultra-large lead-zinc deposits, it is revealed that the black opaque material is the ore-bearing material The main body, which is essentially an ultra-microscopic cryptocrystalline solid that rapidly condenses with heterogeneous sulphide and silicate carbonate slurries, is a realistic microscopic trace of mantle fluid interaction. A comprehensive study on the crust-mantle mixing gradient and the crust-mantle mixing characteristics of isotope composition of lead isotopes in ore minerals shows that the mantle fluid associated with alkali-rich magmatic diagenesis and mineralization carries the ore-forming material along The deep faults migrate upwards and participate in the crustal mineralization in a way that accounts for the superposition of crust and mantle contamination caused by alteration alteration. This is an important geochemical mechanism for forming the Jinding ultra-large lead-zinc deposits.