Metallogenesis and ore-forming time of the Changtuxili Mn-Ag-Pb-Zn deposit in Inner Mongolia:Evidence from C-O-S isotopes and U-Pb geochronology

作     者：Kuo Zhang Ruo-Shi Jin Feng-Yue Sun Bi-Le Li Peng He Yue-Long Zhang Shuo Guo Tian-Fu Zhang Kuo Zhang;Ruo-Shi Jin;Feng-Yue Sun;Bi-Le Li;Peng He;Yue-Long Zhang;Shuo Guo;Tian-Fu Zhang

作者机构：College of Earth SciencesJilin UniversityChangchun130061China Tianjin CenterChina Geological SurveyTianjin300170China North China Center for Geoscience InnovationTianjin300170China Qiqihar BranchHeilongjiang Institute of Geological Survey and ResearchQiqihar150036China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2020年第11卷第4期

页      面：1369-1380页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This study was funded in part by the China Geological Survey(Grant Nos.DD20190075 and DD20160041) 

主　　题：Inner Mongolia Changtuxili Mn-Ag-Pb-Zn deposit C-O-S isotope geochemistry Zircon U-Pb age Intermediate-to low-sulfidation epithermal deposit 

摘      要：This paper reports new geochronological(U-Pb) and isotope(C,O,and S) data to investigate the timing of mineralization and mode of ore genesis for the recently discovered Changtuxili Mn-Ag-Pb-Zn deposit,located on the western slopes of the southern Great Hinggan Range in NE *** mineralization is hosted by intermediate-acidic lavas and pyroclastic rocks of the Baiyingaolao *** stages of mineralization are identified:quartz-pyrite(Stage I),galena-sphalerite-tetrahedrite-rhodochrosite(Stage II),and quartz-pyrite(Stage Ⅲ).δ13C and δ18O values for carbonate from the ore vary from-8.51‰ to-4.96‰ and 3.97‰ to 15.90‰,respectively,which are indicative of a low-temperature alteration environment.δ34SV-CDT values of sulfides range from-1.77‰ to 4.16‰ and show a trend of equilibrium fractionation(δ34SPyδ34SSpδ34SGn).These features indicate that pyrite,sphalerite,and galena precipitated during the period of *** alteration mineral assemblage and isotope data indicate that the weakly acidic to weakly alkaline ore-forming fluid was derived largely from meteoric water and the ore-forming elements C and S originated from *** the mineralization,a geochemical barrier was formed by changes in the pH of the ore-forming fluid,leading to the precipitation of *** the basis of the mineralization characteristics,new isotope data,and comparison with adjacent deposits,we propose that the Changtuxili Mn-Ag-Pb-Zn deposit is an intermediate-to lowsulfidation epithermal deposit whose formation was controlled by fractures and variability in the pH of the oreforming *** surrounding volcanic rocks yield zircon U-Pb ages of 160-146 Ma(Late Jurassic),indicating that the mineralization is younger than 146 Ma.