Sulfur and lead isotopic composition characteristics of the Zhesang gold deposit in Funing County,Yunnan

The Zhesang gold deposit hosted in the Upper Permian sedimentary clastic rocks of the Wujiaping Formation is a typical Carlin-type gold deposit in Southeast Yunnan metallogenic belt.Bed-like and lenticular ore bodies are restricted to fractured zone.The studies of sulfur isotopes indicate that the δ34S values of hydrothermal sulfides(pyrite and arsenopyrite) range from 8.3‰ to 11.3‰,which is generally similar to that of diagenetic pyrite and Permian marine sulfates,suggesting the sulfur was mainly derived from strata.Sulfur dynamic fractionation was mainly controlled by organic thermochemical sulfate reduction(TSR).The research of lead isotope shows that 206Pb/204Pb values have a relatively wide variation range,while 207Pb/204Pb and 208Pb/204Pb values have little change.The calculated model ages of lead have a great varying range(-62 Ma to 389 Ma),and even contain negative age,showing that there was an addition of radiogenic lead to common lead.The lead of ore and ore-bearing strata was mainly provided by upper crust,with a little mixed source of magma.In brief,both sulfur and lead isotopic data show an inheritance between ore and ore-bearing strata,that is,ore-forming materials mainly came from strata.