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时间:2020-03-26
《豫西赤土店铅锌矿床闪锌矿微量元素地球化学特征.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,PetrologyandGeochemistryVo1.34No.2,Mar.,2015豫西赤土店铅锌矿床闪锌矿微量元素地球化学特征田浩浩2,张寿庭2,曹华文2,韩江伟。,吕鹏瑞4,张云辉1.中陕核工业集团公司,西安710100;2.中国地质大学(北京)地球科学与资源学院,北京100083;3.河南省地质调查院,郑州450007;4.中国地质调查局西安地质调查中心,西安710054摘要:赤土店铅锌矿床位于华北陆块南缘豫西南泥湖超大
2、型钼钨多金属矿集区东南部,矿体呈脉状、似层状产于新元古界栾川群煤窑沟组碎屑岩一碳酸盐岩夹石煤层沉积建造中。闪锌矿ICP—MS微量元素分析结果表明,赤土店矿床闪锌矿,以富含In、Ga、Sn、Cd和As等微量元素,而亏损Cu、Ni、T1和Co等元素为特征,形成于中低温环境。总体上该矿床闪锌矿微量元素含量组成特征与层控一岩浆热液叠加改造型铅锌矿床类似,暗示其具有相似的成因联系。闪锌矿稀土元素特征显示出两种配分模式,从早期弱正Eu异常到晚期明显的负Eu异常,而且稀土元素总量有所增加,轻重稀土分馏增强。这种变化反
3、映了成矿流体可能由一个相对还原环境向相对氧化环境的转变,为岩浆热液叠加改造的结果。关键词:微量元素;岩浆热液;叠加改造;闪锌矿;赤土店中图分类号:P611.1;P595文章编号:1007—2802(2015)02—0334—09doi:10.3969/j.issn.1007—2802.2015.02.015GeochemicalCharacteristicsofTraceElementsofSphaleriteintheChitudianPb-ZnDeposit,WestHenanProvinceTIA
4、NHao—hao',ZHANGShou.ring,CAOHua.wen,HANJiang—wei,L0Peng—rui,ZHANGYun.hui1.ChinaShaanxiNuclearIndustryGroup,Xi'an710100,China;2.SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences(Beqing),Beijing100083,China;3.HenanInstituteofGeologicalSurvey,Z
5、hengzhou450007,China;4.nCenterofGeologicalSurvey,ChinaGeologicalSurvey,Xi'an710054,ChinaAbstract:TheChitudianPb·Zndeposit,locatedinthesouthernmarginofthenorthChinablock,isdevelopedwithinthesoutheastsectionoftheNannihusuper-largeMo—Wpolymetallicoreconcent
6、rationareaofthewestHenanprovince,China.Theore—bodiesareoccurredintheclasticrocks—carbonaterockssedimentaryformations(thatinterbeddedwithstonecoa1)oftheNeoproterozoicLuanchuanGroupMeiyapgouFormation,withtheoccurrenceofstratoidandvein.TheICP—MSmeas—uredtra
7、ceelementsdataforsphaleriteandothergeochemicalcharacteristicsoftraceelementsshowthatthesphaleriteofthisdepositwasformedinthemedium·lowtemperatureenvironment,enrichingtraceelementssuchasIn,Ga,Sn,CdandAs,anddepletingCu,Ni,T1andCo.Thetraceelementcomposition
8、softhestudiedsphaleriteareconsistentwiththoseofthestrataboundPb—Zndeposits,whichsuperimposedandtransformedbythemagmatichydrotherm,suggestedthattheyhavesimilargeneticrelationship.TheREEcharacteristicsshowedtwopatterns,thati
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