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凡口铅锌矿床是发育于碳酸盐岩建造中的海底热泉喷溢沉积矿床，以“一大二富三集中”的特点和典型的地质地球化学特征吸引着中外矿床地质工作者。常量元素和矿化元素的分布、矿物包裹体特征、稀土元素组成和硫同位素组成反映出该矿床与外生作用有关。铅同位素组成具有壳源和下地壳来源铅的特征，矿物包裹体水氢、氧同位素组成表明，成矿溶液可能与深层建造水有关，后期与大气降水有关。矿区主要矿层经历海底热泉喷溢沉积-成岩的演化。
The fankou lead-zinc deposit is a seabed hot spring overflowing sedimentary deposit developed in the carbonate rock formation. It attracts geological workers from both China and foreign countries with the characteristics of “one large, two, three and three concentrated” and typical geo-geochemical characteristics. The distribution of major elements and mineralized elements, mineral inclusions, REE composition and sulfur isotopic compositions reflect that this deposit is related to exogenous effects. Lead isotopic composition has the characteristics of crust-derived and lower crustal lead. The hydro-hydroisotopic composition of mineral inclusions indicates that the ore-forming solution may be related to the deep-water construction and the later is related to precipitation. The main ore deposit in the mining area undergoes the sediment-sedimentation-diagenetic evolution of the seafloor hot spring.