Author(s): LI Guanqing, GU Xuexiang, CHENG Wenbin, ZHANG Yongmei, ZHANG Yan, DAI Hongzhang, L Pengrui, ZHANG Xingguo, XIA Baoben, School of Earth Sciences and Resources, China University of Geosciences, Regional Geological Survey Team, Tibet Bureau of Geology and Exploration, College of Earth Science, Chengdu University of Technology, Shandong Institute and Laboratory of Geological Science, Shandong Key Laboratory of Geological Processes and Resource Utilization in Metallic Minerals, Xi′an Center of Geological Survey, China Geological Survey
Pages: 90-104
Year: 2014 Issue:  5
Journal: Earth Science Frontiers
Keyword:  Zhaxikang antimony(sulfur salts)polymetallic deposits; ore-forming material sources; element geochemistry; S and Pb isotopes;
Abstract: The Zhaxikang deposit is a special super-large or large antimony(sulfur salts)polymetallic deposit,which occurred in Lower Jurassic Ritang Formation.Black carbon-bearing calcareous slates are served as the major ore-hosting wall rocks,while the ore-bodies are strictly controlled by south-north striking and north-east striking faults,with occurrences of veins and lenticular shape.This deposit had undergone epithermal and supergene stages during the mineralization.Thus,in addition to sphalerite,galena,stibnite and other common sulfides,the metallic minerals in ores of this deposit include some sulfur salts,such as boulangerite,jamesonite,tetrahedrite and bournonite.Non-metallic minerals are rhodochrosite,siderite,quartz and calcite.The results of element geochemistry have shown that,in addition to the enrichment of major ore-forming elements(e.g.Sb,Pb,Zn and Ag)in mineralized rocks and ore of this mineral deposit,the mineralized elements,such as MnO,Cu,As,Cd and Au,are rich in these ore and rocks.Meanwhile,the ore-forming elements,namely,Sb,As,Ag,Pb,Zn and Mn,are also rich in ore-hosting strata,which can provide the material source for mineralization.For ore sulfides from the Zhaxikang antimony(sulfur salts)polymetallic deposits,their S isotopic composition are similar to the ones of ore-bearing strata,suggesting Sb,As,Ag,S and other components were extracted by ore-forming fluids during migration process,and that these sulfur were mainly provided by the Ritang Formation.Their Pb isotopic composition shows the characteristics of metamorphic crystalline rock series,suggesting that Pb,Zn and other metallic components were sourced from metamorphic crystalline rock series and leucogranites during the mineralization process.In North Himalayan metallogenic belt,the ore sources of typical mineral deposits are of obvious differences.For the Sb and Sb-Au deposits occurred in the central and north parts of this metallogenic belt,the ore-forming materials are sourced from ore-bearing strata and magmatic rocks;but for the Sb(-Au)-Pb-Zn deposits in the south part,in addition to Sb,Au and S that were derived from ore-hosting strata and magmatic rocks,the metamorphic crystalline rock series(Lhagoi Kangri group)and leucogranites also provided some ore-forming materials(for example,Pb and Zn)to the mineralization.