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1、礦物巖石地球化學(xué)通報(bào)·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.34No.2,Mar.,2015豫西赤土店鉛鋅礦床閃鋅礦微量元素地球化學(xué)特征田浩浩2,張壽庭2,曹華文2,韓江偉。,呂鵬瑞4,張?jiān)戚x1.中陜核工業(yè)集團(tuán)公司,西安710100;2.中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院,北京100083;3.河南省地質(zhì)調(diào)查院,鄭州450007;4.中國(guó)地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心,西安710054摘要:赤土店鉛鋅礦床位于華北陸塊南緣豫西南泥湖超大
2、型鉬鎢多金屬礦集區(qū)東南部,礦體呈脈狀、似層狀產(chǎn)于新元古界欒川群煤窯溝組碎屑巖一碳酸鹽巖夾石煤層沉積建造中。閃鋅礦ICP—MS微量元素分析結(jié)果表明,赤土店礦床閃鋅礦,以富含In、Ga、Sn、Cd和As等微量元素,而虧損Cu、Ni、T1和Co等元素為特征,形成于中低溫環(huán)境??傮w上該礦床閃鋅礦微量元素含量組成特征與層控一巖漿熱液疊加改造型鉛鋅礦床類似,暗示其具有相似的成因聯(lián)系。閃鋅礦稀土元素特征顯示出兩種配分模式,從早期弱正Eu異常到晚期明顯的負(fù)Eu異常,而且稀土元素總量有所增加,輕重稀土分餾增強(qiáng)。這種變化反
3、映了成礦流體可能由一個(gè)相對(duì)還原環(huán)境向相對(duì)氧化環(huán)境的轉(zhuǎn)變,為巖漿熱液疊加改造的結(jié)果。關(guān)鍵詞:微量元素;巖漿熱液;疊加改造;閃鋅礦;赤土店中圖分類號(hào):P611.1;P595文章編號(hào):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