陶诗龙,黄敏.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[J].地质找矿论丛,2016,31(2):182-189 |
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 |
投稿时间:2015-08-03 修订日期:2015-11-02 |
DOI:10.6053/j.issn.1001-1412.2016.02.004 |
中文关键词: 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 |
英文关键词:Kendekeke, Qimantage S isotope characteristics Pb isotope characteristics ore material source Qimantage region Qinghai province |
基金项目:国家"十一五"科技支撑计划重大项目(编号:2006BAA01B06)和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。 |
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中文摘要: |
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。 |
英文摘要: |
Kendekeke deposit is one of the important polymetallic deposits in Qimantage region. Analysis of sulfide ore show that values of δ34S 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/204Pb, 15.602~15.713 for 207Pb/204Pb and 18.460~18.703 for 206Pb/204Pb; values of w(Th), /w(U) are from 3.55 to 3.75, which show the characteristic of stable lead isotope; μ values 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. |
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