金顶矿床古元古锆石shrimp年龄的发现及其地质意义

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1、维普资讯http://www.cqvip.com1000-0569／2006／022(04)一1040-48ActaPetrologicaSinica岩石学报金顶矿床古元古锆石SHRIMP年龄的发现及其地质意义修群业，高兰王安建刘俊来曹殿华范世家翟云峰XIUQunYe．一，GA0Lan，WANGAnJian，LIUJunLai4，CA0DianHua2，FANShiJiaandZHAIYunFeng41．核工业北京地质研究院，北京1000292．中国地质科学院矿产资源研究所，北京1000373．中国地质科学院，北京000374．中国地质大学(

2、北京)，北京1000831．BeijingresearchInstitueofUraniumgeology，Beijing1000292．Instituteofmineralresources，ChineseAcademyofGeologicalSciences．Beng1000373．ChineseAcademyofGeologicalSciences．Beijing1000374．ChinaUniversityofgeosciences．Beqing1000832005—12—20收稿．2006-02—24改回．XiuQY。GaoL，Wa

3、ngAJ，LiuJL，CaoDH，FanSJandZhaiYF．2006．DiscoveryofPlaeoproterozoiczirconSHRIMPagefromJindingdepositanditsgeologicalimplications．ActaeetrologicaSinica，22(4)：1040—1048AbstractJindingsuperlargedepositlocatedinthenorthernpartofLanpingBasin，westernYunnanProvince．Ithasbeenstudiedfo

4、rmorethan20years，andalotofgeneticmodelswereproposedsuchasstrataboundtype，synsedimentation—latereformationandmantle．crustcompoundmineralization．Butsomeelementarygeologicalproblemssuchassomeofthewal1．rockagesandthestructuresthatconstrainedorebodieshavebeensuspendedtillnow．The

5、seembarrassedtheexplanationofthegenesisaboutJindingdepositandthetectonicorcrustalevolutionofThree·River(Nujiang，LancangjiangandJinshajiangrivers)orogenicbelt．Forthesereasons，thispaperselectedsomezirconsfromthewal1．roekstodiscussthetectonicsetting．Basedoncrystalfeaturesandsh

6、apesofthezircons．whichweredirentfromthenormalweatheredzirconsinsandstones．thewal1．rocksmustbenotfarwheretheirsourcerocksformedAccordingtotheprocessofzircondating，4groupofisotopicageswereobtainedbySHRIMPIIinBeijingIonMicroprobeCenter．Theyare240Ma．415Ma．820Maand1800～2O0oMa．Th

7、esesuggestedthatthePb．Znmetallizationagewasyoungerthan240Ma．Furthermore，anumberofPlaeoprotozoicages(1910Ma，1867Ma，2021Ma，2487Ma)weremoresignificanceingeologicalstudies．First．itindicatedthatthesourcerocksofLanpingbasincontainedsomePrecambrianages．TheseimpliedthatthePrecambri

8、anbasementofYangtzePlatecouldspreadtoLancanjiangriver．Second，theseisotopicagessuge