Lead and Sulfur Isotope Characteristics and Geological Implication of Daping Gold Deposit

Daping gold deposit,located in the southern Yunnan,is representative gold deposit in Ailao Mountain gold belt.The ore bodies are hosted in Hercynian Taojiazhai diorite body.The ore is mainly quartz vein-type,with a variety of sulfide like,pyrite and galena.The geochemical characters of Pb and S isotope of galena are studied.The quartz-vein-type ores formed in main mineralization stage show that the Pb isotope has a relatively narrow ratio of 206Pb/204Pb and a relatively high ratio of 207Pb/204Pb and ratio of 208Pb/204Pb with a small-group change and normal distributing range of Pb.Interrelated character parameter with calculation is found to analyze the conformation mode of Pb.Pb in the ore is from crust-mantle mixed lead.The composition of sulfur isotope within variation ranges is-4.9‰ to 9.2‰,and average value is 3.12‰,which deviates the scope of aerolitic sulfur but highly approaches the value of basic rocks.Sulfur is mainly from the deep part,while the composition of sulfur isotopes is after S in mantle mixed with substance of the crust.Studies suggest that metallogenic mass of the deposit is from mixture of deep mantle-derived and crust-derived mineral.