Ore-forming process of the Huize super-large Pb-Zn deposit, SW China: Constraints from in situ elements and S-Pb isotopes

•Samples from the contact zone between ore body and dolostone are used to characterize ore-forming process.•Textural and chemical composition of dolomite indicate intensive fluid-rock interaction.•Systematic S and Pb isotope variations of sulfides reflect various replacement of dolostone and precipitation of sulfides.•The pH change has played an important role in ore deposition.•A new model for the ore-forming process was proposed for the Huize deposit.