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时间:2020-03-26
《黔西南灰家堡卡林型金矿田硫铅同位素组成及成矿物质来源研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、矿物岩石地球化学通报·研究成果·BulletinofMineralogy,PetrologyandGeochemistryV01.32No.6。NOV.,2013黔西南灰家堡卡林型金矿田硫铅同位素组成及成矿物质来源研究王泽鹏,夏勇,宋谢炎,闫宝文,谭亲平1.中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002;2.中国科学院大学,北京100049摘要:为探讨黔西南灰家堡金矿田中成矿物质来源,作者对其部分典型矿床中硫化物进行了系统的硫、铅同位素分析。结果显示,雄黄s值为0.81%o~
2、5.20o,均值为1.96%。,两件辉锑矿8“s值分别为一0.47%0和一4.88%0。雄黄和辉锑矿s值主要在0‰附近,硫同位素直方图显示明显的塔式效应,指示成矿流体中硫可能主要来源于深部。雄黄、黄铁矿铅同位素组成变化均较大,雄黄铅同位素组成的变化明显大于黄铁矿且更接近于区域地层及峨眉山玄武岩。矿石铅值为9.33~9.61,主要小于9.58,推测为循环大气降水淋滤围岩地层岩石中高放射性成因的铅加入原始成矿流体,从而导致晚期雄黄显示出部分壳源铅特征。矿田内雄黄、黄铁矿的铅同位素可能为壳幔混合铅。关键词
3、:硫同位素;铅同位素;成矿物质来源;灰家堡金矿田;黔西南中图分类号:P618.51文献标识码:A文章编号:1007—2802(2013)06—0746—07SulfurandLeadIsotopicCompositionoftheHuijiab~oCarlin—typeGoldFieldandtheOre-FormingMaterialSourcesinSouthwestofGuizhouWANGZe—peng’。,XIAYong,SONGXie—yan,YANBao—wen’。,TANQin—pi
4、ng,。1.StateKeyLaboratoryofOreDepositGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,China;2.GraduateUniversityoftheChineseAcademyofSciences,Beijing100049,ChinaAbstract:Todiscusstheevolutionofpotentialmetalsources,sulfurandle
5、adisotopiccompositionsofsulfidesintyp—icalgolddepositsfromtheHuijiahaoCar[in-typegoldfieldhavebeensystematicallyanalyzed.TheresultsshowedthattheSvaluesofRealgarsrangefrom0.81%。to5.20%0withameanof1.96%0,andtheSvaluesoftwoStibnitesare一0.47%0and一4.88%0.Th
6、e艿。SvaluesofRealgarsandStibnitespresentatowerdistributionwithmostvaluesnear0%o,indicatingdeepzoneoriginations.Leadisotopiccompositionsofrealgarsandpyritesrangewidely,thevariationofleadisotopiccompositionofrealgarsishigherthanthatofpyrites,andleadisotop
7、ecompo—sitionsofrealgarsareveryclosetothoseoftheregionalstrataandtheEmeishanbasalts.Thevaluesoftheoresarefrom9.33to9.61。withmajoritiesarebelow9.58.LeadinthelatestageRealgarexhibitsacrust—derivedchar—acteristicsmaybetheresultofradiogenicleadinwaltrocksb
8、eingleachedintotheprimaryore-formingfluidbycir—culatedmeteoricwater.Theleadisotopesinthestudiedrealgarandpyritemayindicatemixingofthecrustandthemantleleads.Keywords:sulfurisotope;leadisotope;ore—formingmaterialsources;huijiabaoCarlin—ty
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