Abstract: According to the S,Pb isotope survey results of the six pieces of ore samples from the polymetallic deposit in Mabugang,the parameters and graphic of S,Pb isotopes were calculated by Geokit software,to discuss the source of ore-forming materials.Results showed that: the δ³⁴S of sulfide mainly varies from -4.6‰ to +3.2‰,which reflects the composition characteristics of magmatic sulfur.δ²⁰⁶Pb/δ²⁰⁴Pb of Pb isotope among minerals is from 18.6 to 18.8,δ²⁰⁷Pb/δ²⁰⁴Pb is from 15.7 to 5.8,and δ²⁰⁸Pb/δ²⁰⁴Pb is from 39.07 to 39.25.All these display a normal lead character,which are similar to the lead isotopic composition at the upper crust of orogenic belt.In summary,the analysis indicated that the metallogenic sources of Mabugang polymetallic deposit mainly come from the upper crust.Its tectonic background is under cratonization action,and is basically consistent with the actual tectonic environment of mine field at active continental margin.

Key words: Sulfur isotope, Lead isotope, Polymetallic deposit