The Characteristics Of Trace Elements,sulfur And Lead Isotope Of Ore Minerals And Mineralization Genesis Of The Shuangjianzishan Pb-Zn-Ag Deposit In Inner Mongolia,China

The Shuangjianzishan Pb-Zn-Ag deposit is located in Fuhe Town,Chifeng City,Inner Mongolia and is located in the southern section of Da Hinggan Mountains.Based on the previous studies and the geological characteristics of the Shuangjianzishan Pb-Zn-Ag deposit,combined with field geological prospection and indoor analysis,using microscopic observation,scanning electron microprobe,sulfur and lead isotope,trace elements concentrations in sulfides.The major conclusions achieved are as follows:1)The metallogenic stage of the Pb-Zn-Ag deposit can be divided into three stages: quartz-pyrite stage,galena-sphalerite-silver mineral stage and quartz-calcite stage.2)The occurrence of silver in the Shuangjianzishan deposit is dominated by individual silver minerals,and the content of invisible silver is very low.Silver minerals include canfieldite,freibergite,polybasite,pyrargyrite and argentite.The wrapped silver is the most important form of mode of occurrence of silver minerals in the Shuangjianzishan deposit.Galena is the most important silver-bearing mineral.3)The source of ore-forming materials was discussed by analyzing the composition of S and Pb isotope in the Shuangjianzishan Pb-Zn-Ag deposit.The S isotope indicating the ore-forming material is mainly derived from deep-source magma.The lead isotope indicates Lead in ore-forming fluids is derived from Mesozoic magma and surrounding rock.4)The trace element characteristics of the Shuangjianzishan deposit reflect that the ore minerals are formed under medium to low temperature conditions,and the hydrothermal fluid is dominated by a Cl-rich fluid.5)Sphalerite of the deposit is rich in Mn,Fe,Ag,Cu and Pb;it is also relatively enriched in Cd,Sn,In and Ga.Trace element characteristics of sphalerite in the deposit show similarities to those from other hydrothermal vein type deposit.