Study on Mineral Chemistry of Liziping-Fulongchang Pb-Zn-Ag Deposit in Western Yunnan and Its Metallogenic Significance

The mineral composition and mineral chemical composition of Liziping and Fulongchang lead-zinc-silver deposits have been ascertained in detail by means of optical microscopy, XRD, FESEM and EMPA. The mineralo-gical study shows that the sulfide/sulfosalt minerals in Liziping deposit mainly include sphalerite, gratonite, galena, arsenic-bearing pyrite. The sulfide/sulfosalt minerals in the Fulongchang deposit mainly include sphalerite, galena, jordanite and pyrite. The mineral chemical characteristics indicate that the two deposits have undergone metasomatism and activation of As elements by Pb-Zn ore-forming fluids to As-rich pyrite breccia; precipitation of sphale-rite and galena; the process of formation of sulfosalts by replacement of galena by As-(Sb, Cu) rich residual fluids. The difference of sulfur salt type in each ore section is controlled by ore-forming fluid composition and physicochemical conditions. In this paper, the mineralogy and mineral chemistry of the ore-bearing Pb-Zn-Ag metalloge-nic system of sediment-hosted rich in As and Sb elements will help to promote the theoretical understanding of mineralization of similar deposits.