Metallogeny Of Fankou Superlarge Pb-Zn Ore Field, Guangdong Province

Fankou Pb-Zn ore deposit is situated on the Northeast of Quren structural basin in Nanling mineralization belt, its genesis and metallogenic source are hot spot of research for many years. Directed by the Polygenetic and compound progressive Metallogenic theory of Diwa theory, based on the geologic research and start with isotope and physicochemical environment, the dissertation has made some researches and gains some new recognitions in Metallogenic Source, genesis, mineralizing process and Metallogenic prognosis.1. Based on the analysis of the Geochemical aureole and mineralizing process, it is pointed out that the metallogenic source originated from magma hydrothermal solution of crustal remelting and ascend along the old fracture which NEE—NE direction, it formed element diffusion aureole in lagoon environment.2. Based on the study of isotope features of H, O,Pb and S, it is concluded that the metallogenic source are complex in Fankou Pb-Zn ore deposit. S from mineral-bearing stratum, Metallogenic elements from the source area and excurrent area of Metallogenic fluids, and Metallogenic fluids are magma fluid and ground hot water from later of Indo-Chinese epoch to early Yenshan epoch. The metallogenic sources are polygenous.3. Based on study of the physicochemical environment, it is indicated that the metallogenic temperature is high in early stage and low in later stage. The dissolution and transportation form are different in every metallogenic stage.4. The form, distribution and emplacement are controlled by many factors in Fankou Pb-Zn ore deposit. The palaeogeographic environment of sediment and its variation in space-time distribution control the distribution and intension of pyritization of diagenetic stage in Qixin group and Shetianqiao group in Devonian; the fault, fold and interstratal sliding surface of Indo-Chinese epoch control the mineralization belt and its form, the migmatite of magma fluid and ground hot water from later of Indo-Chinese epoch to early Yenshan epoch is significant control factor of deposit forming.5. It is concluded that the Fankou Pb-Zn ore deposit is a typical polygenetic and compound deposit, which is characterized by multiple stages, multiple metallogenesis, multiple ore-controlled factors, polymaterial sources and polygenetic types.6. Finally, the Metallogenic model and provided prospecting proposals has been established.