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《黔西南泥堡金矿含矿岩系元素地球化学特征.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,PetrologyandGeochemistryVo1.32No.5,Sep.,2013黔西南泥堡金矿含矿岩系元素地球化学特征陈世委,孙军,付斌,聂爱国贵州大学资源与环境工程学院,贵阳550025摘要:为探讨泥堡金矿成矿物质来源,采用ICPMS对黔西南泥堡金矿典型含矿剖面上9个岩(矿)石样品进行微量和稀土元素测试,结果表明,含矿岩系中As、Sb、Hg、Ti、U等元素的富集与组合特征,显示热液作用是成矿过程中重要影响因素。峨眉山玄武岩组7个样品的微量元素含量变化相似,相关性较好(r为0.6O~O.
2、99,均值为0.83),矿石中Zr/Ni、La/Nb、Rb/Nb、Th/Nb、Th/!a等不相容元素比值均落在峨眉山玄武岩变化范围之内;含矿岩系稀土含量较高,轻稀土明显富集且分馏明显,均与峨眉山玄武岩相似。综合该区地质背景和岩浆活动特征,可认为成矿物质来源与该地区广泛分布的峨眉山玄武岩关系密切,峨眉山玄武岩本身可能即是金矿的矿源层,而峨眉地幔热柱活动引发广泛的岩浆活动和裂谷作用,为富矿热液提供了热源和运移通道。关键词:含矿岩系;泥堡金矿;元素地球化学特征;黔西南中图分类号:P595文献标识码:A文章编号:10072802(2013)05—0591—08Geochemi
3、calCharacteristicsofOre-bearingRockSeriesintheNibaoGoldDeposit,SWGuizhouCHENShi—wei,SUNJun,FUBin,NIEAi—guoCollegeofResourcesandEnvironmentalEngineering,GuizhouUniversity,Guiyang550025,ChinaAbstract:Concentrationsoftraceandrareearthelementsof9oreandrocksamplescollectedfromatypicalprofile
4、oftheNibaogolddeposit,SWGuizhouProvince,weredeterminedbyICP—MS,andtheoriginoftheorematerialwasdisused.TheenrichmentandthegroupcharacteristicsofAs,Sb,Hg,TiandUintheore—bearingseriesrevealthattheNibaogoldmineisofhydrothermalgenesis.Variationsof25traceelementsin7samplesoftheEmeibasaltforma
5、tionaresimilartoeachother,withcorrelationcoefficientsrangingfrom0.6Oto0.99(average0.83),thecharacteristicratiosofincompatibleelements,suchasZr/Ni,La/Nb,Rb/Nb,Th/NbandTh/La,arewithintherangesofintheEmeiBasalt.Besides,rareearthelementsanalysesshowthattheore—bearingseriescontainarela—tiveh
6、igh∑REE,andthatratiosofLREE/HREEand(La/Sm)Nareallfarbiggerthan1,whichareverysimilartothoseoftheEmeiBasalt.Consideringthegeologicalbackgroundandmagmatism,webelievedthattheorematerialiscloselyrelatedtotheEmeiBasalt,andtheEmeiBasaltitselfisthepotentialsourceofgold,thatis,magmaandriftactivi
7、tiesoftheEmeimantleplumeprovidethegold—-enrichedhydrothermalfluidaswellasheatsourceandmi—grationpath.Keywords:ore—bearingrockseries;Nibaogolddeposit;elementchemicalcharacteristics;SWGuizhou近三十年来在中国西南地区相继发现卡林型层位和岩性控制十分明显Ⅲ。但与美国卡林型金矿金矿床(点)50余个,其中绝大多数金矿床(点)尽管相似,黔西南卡林型金矿成矿作用和机制复杂,众在
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