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时间:2020-03-23
《与内蒙哈达特陶勒盖铅锌矿有关的花岗岩成因探讨.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、2013年9月,第19卷,第3期,415—424页高校地质学报September2013,Vo1.19,No.3,P.415-424GeologicalJournalofChinaUniversities与内蒙哈达特陶勒盖铅锌矿有关的花岗岩成因探讨陈进全,徐兆文,雷菲,陈伟,王浩,王少华1.内生金属矿床成矿机制研究国家重点实验室(南京大学),南京大学地球科学与工程学院,南京210093;2.福建地质调查研究院,福州350011摘要:哈达特陶勒盖铅锌矿床处于华北板块与西伯利亚板块交汇部位,是二连浩特一东乌珠穆沁旗多金属成
2、矿带中新发现的一个中型铅锌矿床。矿区内与Ph—zn矿化有关的花岗岩为隐伏岩体,LA.ICP.MS锆石U—Pb定年显示,花岗岩侵入时间为(125±4.3)Ma,属于燕山期岩浆活动产物。岩石地球化学分析表明,花岗岩具有高硅、高碱(大部分Na3、位素显示该碱性花岗岩主要来源于中元古代上地壳的部分熔融。构造环境判别图解则指示该碱性花岗岩形成于造山后的拉张构造环境。关键词:碱性长石花岗岩;岩石化学;Nd—Pb同位素;哈达特陶勒盖铅锌矿床;内蒙阿巴嘎旗中图分类号:P588.121文献标识码:A文章编号:1006—7493(2013)03—415—10InvestigationoftheGenesisofGraniteintheHardatTolgoiPb-ZnOreDeposit,InnerMongoliaCHENJinquan’一XUZhaowen,LeiFei,4、CHENWei’WANGHao’WANGShaohua’,,,1.StateKeyLaboratoryforMineralDepositsResearch(NanjingUniversity),SchoolofEaahSciencesandEngineering,NanjingUniversity,Nanjing210093,China;2.GeologicSurveyofFujianProvince,Fuzhou,Fujian350011,ChinaAbstract:TheHardatTolgoiPb—Zndepos5、itisamedium—sizedPb—ZndepositrecentlyfoundinErenhot-DongwuqipolymetallicorebeltalongthesuturezonebetweentheNorthChinaplateandtheSiberiaplate.ThegraniterelevanttothePb—Znmineralizationintheorefieldisaconcealedpluton.TheLA—ICP—MSzirconU-Pbdatingindicatesthatthegra6、nitewasemplacedat125±4.3Maandthuswastheproductsof“Yanshanian”magmatism.Detailedgeochemicaldatashowthatthegraniteiscomposedofweaklyperaluminous(A/CNK=0.99-1.081rockswithlowiron,highsilicon,andhighalkalicontents(mostlyNa7、eelements(LILEs,suchasRbandK),NdandTa,butisdepletedinhigh-fieldstrengthelements(HFSEs,suchasNbandTi),BaandSr.Thechondrite—normalizedREEpatternshowsMtypewithtetradeffectandstrongEudepletion(8Eu=O.003-0.013).Theseresultssuggestthatthealkalinefeldspargranitebelongs8、toalkalinityAtypegraniteandwasformedinapost—orogenictectonicenvironment.Nd-PbisotopiccompositionsshowthatthealkalinefeldspargranitewasderivedfrompartialmeltingoftheMe
3、位素显示该碱性花岗岩主要来源于中元古代上地壳的部分熔融。构造环境判别图解则指示该碱性花岗岩形成于造山后的拉张构造环境。关键词:碱性长石花岗岩;岩石化学;Nd—Pb同位素;哈达特陶勒盖铅锌矿床;内蒙阿巴嘎旗中图分类号:P588.121文献标识码:A文章编号:1006—7493(2013)03—415—10InvestigationoftheGenesisofGraniteintheHardatTolgoiPb-ZnOreDeposit,InnerMongoliaCHENJinquan’一XUZhaowen,LeiFei,
4、CHENWei’WANGHao’WANGShaohua’,,,1.StateKeyLaboratoryforMineralDepositsResearch(NanjingUniversity),SchoolofEaahSciencesandEngineering,NanjingUniversity,Nanjing210093,China;2.GeologicSurveyofFujianProvince,Fuzhou,Fujian350011,ChinaAbstract:TheHardatTolgoiPb—Zndepos
5、itisamedium—sizedPb—ZndepositrecentlyfoundinErenhot-DongwuqipolymetallicorebeltalongthesuturezonebetweentheNorthChinaplateandtheSiberiaplate.ThegraniterelevanttothePb—Znmineralizationintheorefieldisaconcealedpluton.TheLA—ICP—MSzirconU-Pbdatingindicatesthatthegra
6、nitewasemplacedat125±4.3Maandthuswastheproductsof“Yanshanian”magmatism.Detailedgeochemicaldatashowthatthegraniteiscomposedofweaklyperaluminous(A/CNK=0.99-1.081rockswithlowiron,highsilicon,andhighalkalicontents(mostlyNa7、eelements(LILEs,suchasRbandK),NdandTa,butisdepletedinhigh-fieldstrengthelements(HFSEs,suchasNbandTi),BaandSr.Thechondrite—normalizedREEpatternshowsMtypewithtetradeffectandstrongEudepletion(8Eu=O.003-0.013).Theseresultssuggestthatthealkalinefeldspargranitebelongs8、toalkalinityAtypegraniteandwasformedinapost—orogenictectonicenvironment.Nd-PbisotopiccompositionsshowthatthealkalinefeldspargranitewasderivedfrompartialmeltingoftheMe
7、eelements(LILEs,suchasRbandK),NdandTa,butisdepletedinhigh-fieldstrengthelements(HFSEs,suchasNbandTi),BaandSr.Thechondrite—normalizedREEpatternshowsMtypewithtetradeffectandstrongEudepletion(8Eu=O.003-0.013).Theseresultssuggestthatthealkalinefeldspargranitebelongs
8、toalkalinityAtypegraniteandwasformedinapost—orogenictectonicenvironment.Nd-PbisotopiccompositionsshowthatthealkalinefeldspargranitewasderivedfrompartialmeltingoftheMe
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