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1、第5期fir戸保犯与刷用No.52016年10月CONSERVATIONANDUTILIZATIONOFMINERALRESOURCESOct.2016豫西沙沟银铅锌矿床硫铅同位素地球化学*罗正传1,2,郭保健3,刘智琳1,2,魏明君1,曹廷坤1(1.河南省有色金属矿产探测工程技术研究中心，河南省郑州市450016;2.河南省有色金属地质勘查总院，河南省郑州市450052;3.河南省有色金属地质矿产局，河南省郑州市450016)摘要:沙沟银铅锌矿床位于华北克拉通南缘豫西熊耳山地体西段，是近年来新发现的大型枸造蚀变岩型银铅锌矿。通过对该矿床主成矿阶段石英-多金属硫化物矿石
2、中金属硫化物的硫、铅同位素地球化学特征分析研究，认为硫同位素组成变化范围为-1.〇知~6.3知，平均值2.0知，硫主要来源地幔，并有地壳硫加人，具混合硫特征；铅同位素M6Pb/M4Pb比值为I7.768~n.854,2tnPb/M4Pb比值为I5.485~15.578，M8Pb/204Pb比值为38.462~38.695,变化范围均不大，属于正常铅范围。利用计算获得的铅同位素相关特征参数，结合铅枸造模式图及相关图解综合分析，认为矿石铅以幔源为主，具壳幔混合特征。矿床的硫、铅同位素组成表明，其成矿物质来源于造山过程中壳幔混合源，以幔源为主。关键词:沙沟矿床;硫同位素;铅同
3、位素;地球化学中图分类号：P618.42;P618.43文献标识码：B文章编号：1001-0076(2016)05-0054-05D01：10.13779/j.cnki.issnlOOl-0076.2016.05.013StudyontheSulfurandLeadIsotopeGeochemistryoftheShagouAg-Pb-ZnDepositinWestHenanProvinceLUOZhengzhuan1，2，GUOBaojian3，LIUZilin1，2，WEIMinjun1，CAOTinkun1(1.HenanNon-ferrousMineralExp
4、lorationEngineeringReseachcenterofHenanProvince,Zhengzhou450016,China；2.HenanInstituteofGeologicalExplorationforNon-ferrousMetal,Zhengzhou450052,China；3.HenanProvincialNon-FerrousMetalsGeologicalandMineralResourcesBurea,Zhengzhou450016,China)Abstract：Shagoularge-scaleAg-Pb-Zndepositisast
5、ructurecontrolledalterationtypedeposit,whichislocatedinthewesternpartoftheXiongershaninthesouthmarginofnorthChinaera-ton.Theisotopedataofthequartz-polymetallicsulfidesinthemainore-formingstageshowthatb34S/%cvariesfrom-1.0%〇to6.3%owithanaverageof2.0%〇yimplyingthatsulfurismainlyderivedfrom
6、mantleandminorityderivedfromcrust.The2〇6Pb/2〇4Pboftheorevariesfrom17.768to17.854,207Pb/204Pbvariesfrom15.485to15.578,and2〇8Pb/2〇4Pbvariesfrom38.462~38.695,whichhavenarrowfluctuationsandbelongtonormalPbscope.Accordingtotherelevantcharacteristicparameters,itsstructurepatternandchartofthePb
7、,itisbelievedthatthePboftheoreismainlyderivedfrommantleandminorderivedfromcrust.Theisotopecompositionsofsulfurandleadindepositindicatethatthemetallogenicmaterialsarederivedfromthemixtureofmantleandcrustinorogenicprocess,andmainlyfromthemantle.Keywords：Shagoudeposit;sulfur
