Magmatic hydrothermal overprinting in the super large Dajiangping S(Pb-Zn) SEDEX deposit, Guangdong Province

The Dajiangping deposit is the largest SEDEX pyrite deposit in South China Block. The pyritic sulphides occur in the Sinian metamorphic rocks as laminated sulphides and massive lenses. Recently, new veins and layered lead-zinc orebodies underlying the pyritic orebodies have been discovered. Sphalerite in Pb-Zn orebodies provided an Rb-Sr icochron age of 88.5 +/- 3.9Ma, indicating that it is not contemporaneous with pyrite sulphide bodies. The petrographic and microthermometric analysis of fluid inclusions from the two types of mineralization implies that they have different fluid homogenization temperatures and salinities. Sulfur isotope evidence indicates that the Pb-Zn orebody was formed by magmatic hydrothermal mineralization in the Cretaceous, and the pyrite orebody was probably overprinted by Cretaceous magmatic-hydrothermal activity.