青海祁漫塔格肯德可克多金属矿床硫、铅同位素特征及成因意义  

S and Pb isotope Characteristics of Kendekeke polymetallic deposit in Qimantage region,Qinghai province and the genetic significance

作　　者：陶诗龙 赖健清[1,2] 黄敏[1,2,3] 

机构地区：[1]中南大学有色金属成矿预测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083 [3]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《地质找矿论丛》2016年第2期182-189,共8页Contributions to Geology and Mineral Resources Research

基　　金：国家"十一五"科技支撑计划重大项目(编号:2006BAA01B06);中国地质调查局项目(编号:资[2008]青藏21-03;编号:资[2011]03-01-64)联合资助

摘　　要：肯德可克矿床是祁漫塔格成矿带中一个重要的铁多金属矿床。其硫化物矿石的硫同位素测试结果显示,δ34S值介于-2.0×10^(-3)^+5.96×10^(-3)之间,平均为+1.65×10^(-3),与岩浆硫的范围较吻合。铅同位素208Pb/204Pb值介于38.176~38.699之间,207Pb/204Pb值介于15.602~15.713之间,206Pb/204Pb值介于18.460~18.703之间;w(Th)/w(U)值介于3.55~3.75之间,表现出稳定铅同位素特征;μ值变化范围为9.48~9.75,在原始地幔(μ0=7.80)与地壳(μc=9.81)之间,充分反映壳幔混合铅的特征;估算地壳和地幔中铅组分分数分别为0.82~0.97和0.03~0.18,推断矿床铅质主要为地壳成分为主、含少量地幔成分的岩浆岩,即壳幔混合源。结合矿床地质特征及前人研究成果,认为此矿床以夕卡岩型为主体的多金属矿床。Kendekeke deposit is one of the important polymetallic deposits in Qimantage region.Analysis of sulfide ore show that values ofδ34S range from-2.0×10-3 to ＋5.96×10-3 and averagely ＋1.65×10-3 coinciding with that of magma;value range of Pb isotope is small,38.176~38.699 for 208Pb/204 Pb,15.602~15.713 for 207Pb/204 Pb and 18.460~18.703 for 206Pb/204Pb;values of w（Th）,/w（U）are from3.55 to 3.75,which show the characteristic of stable lead isotope;μvalues from 9.48 to 9.75,between the value of primitive mantle（μ0=7.80）and crust（μc=9.81）,showing the characteristic of crust-mantle mixed lead.The proportions of Pb in the crust and mantle are estimated to be 0.82~0.97 and 0.03~0.18 respectively.It is speculated that crust Pb is dominant and a little from mantle magma,i.e.crust-mantle mixed Pb.According to the geological characteristics and the previous data we consider Kendekeke deposit a skarn-dominated polymetallic deposit.

关 键 词：肯德可克矿区 硫同位素特征 铅同位素特征 成矿物质来源 祁漫塔格 青海省 

分 类 号：P588.12[天文地球—岩石学] P597[天文地球—地质学]