河南栾川脉状铅锌矿床Pb同位素地球化学特征  

Pb ISOTOPE COMPOSITIONS OF VEIN TYPE Pb-Zn ORE DEPOSITS IN LUANCHUAN DISTRICT,HENAN PROVINCE

作　　者：段士刚[1] 薛春纪[1] 冯启伟[1] 高炳宇[1] 刘国印[2] 燕长海[2] 宋要武[2] 

机构地区：[1]地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院,北京100083 [2]河南省地质调查院,河南郑州450007

出　　处：《矿物岩石》2010年第4期69-78,共10页Mineralogy and Petrology

基　　金：国家自然科学基金(40772061、40472054);地质过程与矿产资源国家重点实验室开放基金(GPRM200832);中央高校基本科研业务费专项资金(2009PY04);高等学校学科创新引智计划(B07011);长江学者和创新团队发展计划(IRT0755)

摘　　要：针对分布于豫西南栾川地区的脉状铅锌矿床,进行铅锌矿、地层和岩浆岩的铅同位素数据对比分析研究显示:该区铅锌矿床的铅同位素组成(赤土店矿床206Pb/204Pb=17.005～17.953,207Pb/204Pb=15.414～15.587,208Pb/204Pb=37.948～39.036;冷水北沟矿床206Pb/204Pb=17.602～17.954,207Pb/204Pb=15.458～15.606,208Pb/204Pb=38.208～38.772;百炉沟矿床206Pb/204Pb=17.552～18.426,207Pb/204Pb=15.451～15.5794,208Pb/204Pb=38.264～39.637)与区内燕山期斑岩和地层的铅同位素组成(燕山期斑岩206Pb/204Pb=17.189～17.894,207Pb/204Pb=15.381～15.569,208Pb/204Pb=37.655～39.01;元古界岩石206Pb/204Pb=17.694～19.249,207Pb/204Pb=15.467～15.585,208Pb/204Pb=38.303～41.104)有一定的相似和差别。铅同位素特征值(μ值、ω值)、Δβ-Δγ、206Pb/204Pb-207Pb/204Pb、Δα-Δβ-Δγ等分析研究,揭示铅锌矿床铅与燕山期斑岩和地层铅的来源关系,综合研究,认为栾川地区脉状铅锌床为与燕山中期斑岩侵入有关的岩浆热液充填-交代型矿床,成矿物质存在燕山期岩浆和围岩地层两种来源。Hundreds of Pb-Zn ore veins have been discovered recently in Luanchuan district,Henan Province,which shows a broad prospect for Pb-Zn resources.However,there are different views about the genesis of these Pb-Zn ore veins.The Pb isotope compositions of the Pb-Zn vein ores,strata,and Yanshannian porphyry were studied so as to analyze the problem.It was showed that Pb isotope compositions of Pb-Zn vein ores（Chitudian Pb-Zn deposit：206Pb/204Pb=17.005 to 17.953,207Pb/204Pb=15.414 to 15.587,208Pb/204Pb=37.948 to 39.036;Lengshuibeigou Pb-Zn deposit：206Pb/204Pb=17.602 to 17.954,207Pb/204Pb=15.458 to 15.606,208Pb/204Pb=38.208 to 38.772;Bailugou Pb-Zn deposit：206Pb/204Pb=17.552 to 18.426,207Pb/204Pb=15.451 to 15.5794,208Pb/204Pb=38.264 to 39.637）are similar to either of the Yanshannian porphyries or the Proterozoic strata（Yanshannian porphyry：206Pb/204Pb=17.189 to 17.894,207Pb/204Pb=15.381 to 15.569,208Pb/204Pb=37.655 to 39.01;Proterozoic strata：206Pb/204Pb=17.694 to 19.249,207Pb/204Pb=15.467 to 15.585,208Pb/204Pb=38.303 to 41.104）.The values of μ and ω and the plot on the diagrams of Δβ-Δγ,206Pb/204Pb versus 207Pb/204Pb,and Δα-Δβ-Δγ,revealed the source relationships of Pb between Pb-Zn ore veins and Yanshannian porphyries or Proterozoic strata.These results coupled with the evidence of other research（on ore geology,mineralogy,fluid inclusions,and S isotope）perhaps reflected the fact that the metallogenic materials were from a combined sources of Yanshannian porphyries and Proterozoic wall-rock,suggesting that the Pb-Zn ore veins were magmatic hydrothermal filling-metasomatic deposits related to Yanshannian porphyry intrusion.

关 键 词：铅同位素 铅锌矿床 岩浆热液充填-交代型矿床 河南栾川 

分 类 号：P597.2[天文地球—地球化学]