Pb-Zn deposits were formed through the reformation and concentra-tion by CO_2-rich near-surface circulating water on the basis of higher ini-tial Pb-Zn abundance of ore-hosting strata. Their ore-forming age corre-sponds mainly to the Early Hercynian.

• 矿化是在控矿地层具有较高的铅锌初始丰度基础上,经过地表的富CO_2的循环水改造富集而成,其主要成矿期相当于海西早期。