Sulfur and Lead Isotope Composition and Tracing for Sources of Ore-forming Materials in the Dongzhongla Pb-Zn Deposits in Mozhugongka County,Tibet

In order to discuss the ore-forming material sources of the Dongzhongla Pb-Zn deposits and study the metallogenic mechanism,we analyzed the sulfur and lead isotope from the orebody,discussed the changing regularity and significance.The results show that the δ34S values of the six metal sulfides vary from 2.2‰ to 4.8‰,and that the sulfur isotope composition is stable.The temperatures calculated from sulfide-paras show that the deposits are the middle-low temperature deposits.The 206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb ratios of 6 sulfide samples of orebody vary in ranges of 18.628 0-18.629 6,15.698-15.699 9,39.0775-39.082 4,with the average values of 18.628 7,15.699 02 and 39.079 37,respectively.The results of sulfur and lead isotope show that the ore-forming materials of Dongzhongla Pb-Zn deposits came from the Permian volcanic sedimentary rock and late Yanshan period granite.