华北克拉通北缘赤峰地区显生宙麻粒岩的发现及其意义.pdf

《华北克拉通北缘赤峰地区显生宙麻粒岩的发现及其意义.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、第19卷第3期EarthScienceFron地tie学rs前(C缘hin(a中U国niv地er质sity大o学fG(et。Ls京cien)c；es北(B京eij大ing学)；)PekingUniversity)V01．19No．32012年5月Mav2012华北克拉通北缘赤峰地区显生宙麻粒岩的发现及其意义邵济安，张舟，佘宏全。，刘东盛1．北京大学造山带与地壳演化教育部重点实验室，地球与空间科学学院，北京1008712．中国科学院地质与地球物理研究所，北京1000293．中国地质科学院地质研究所，北京1000374．中国地质大学(北京)地球科学与资源学院，北京100083ShaoJi’

2、an，ZhangZhou，SheHongquan3，LiuDongcheng1．KeyLaboratoryoJOrogenicBeltsandCrustalEvolution，MinistryofEducation；SchoolofEarthandSpaceSciences，PekingUniver—sity，Beijing100871，China2．InstituteoJGeologyandGeophysics，ChineseAcademyofSciences，Bering100029，China3．InstituteoJGeology，ChineseAcademyofGeologi

3、calSciemes，Beijing100037，China4．S(hoolofEarthScienceandMineralResources，ChinaUniversityofGeosciences(Beijing)。Beijing100083．ChinaShaoJi’all，ZhangZhou，SheHongquan，eta1．ThediscoveryofPhanerozoicgranuliteinChifengareaofNorthCratonanditsimplication．EarthScienceFrontiers，2012，19(3)：188—198Abstract：It

4、isfoundthatthezirconSHRIMPU-PbagesofthePermianmaficgranuliteanditshostroek-dio—rite-inChaihulanziofChifengareaare262．3±3．1Maand256．6±6．5Marespectively，andthatthezirconSHRIMPU—PbagesoftheTriassicmariegranuliteanditshostrock—。diorite-inHenanyingziofNingchengareaare229．7±2．6Maand221±3Marespectively

5、．Otherformsofmagmationinthisperiodwerealsodiscoveredintheseareas，includingPermianaccretionedgesaroundtheArchaeozoiczirconandPermiandiorite-veins．ComparativestudysuggeststhatthePermianmagmationpossessedthecharacteristicsoftheinitialstageofacontinentalriftwithrelatively1owcontentofhigh—fieId—stren

6、gthelements，andthattheincreasedTriassichighfieldstrengthelementsindicateahigherdegreeofmantlepartialmelting．ThosegranulitesincombinationrecordedimportantinformationaboutthetransformationofNorthChinaCratonfromstabletoactiveinitsearlystage．Isotope-geologicalstudyindicatesthatsuchtransformationbega

7、nwiththecrust—mantleinterac—tion．ThePermianmagmationherewasrelatedtotheglobaltectonicevolutionandbimodalvolcanicactivityinHingganMongoliaOrogenatthatperiod．TheTriassicmagmationherewasrelatedtointracontinentalexten—sionundert