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华北板块北缘中段早中二叠世的构造属性来自花岗岩类锆-岩石学报.PDF

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10000569/2013/029(09)298703 ActaPetrologicaSinica 岩石学报 华北板块北缘中段早中二叠世的构造属性:来自 花岗岩类锆石UPb年代学及地球化学的制约  王挽琼 徐仲元  刘正宏 赵庆英 蒋孝君  WANGWanQiong,XUZhongYuan ,LIUZhengHong,ZHAOQingYingandJIANGXiaoJun 吉林大学地球科学学院,长春 130061 CollegeofEarthScience,JilinUniversity,Changchun130061,China 20121119收稿,20130611改回 WangWQ,XuZY,LiuZH,ZhaoQYandJiangXJ2013EarlyMiddlePermiantectonicevolutionofthecentralnorthern marginoftheNorthChinaCraton:ConstraintsfromzirconUPbagesandgeochemistryofthegranitoidsActaPetrologica Sinica,29(9):2987-3003 Abstract  Thispaperpresentspetrological,geochronologicalandgeochemicalstudyonLatePaleozoicintermediatefelsicintrusions fromtheOndorSumTieshagaiareainInnerMongolia,whichistectonicallylocatedinthecentralnorthernmarginoftheNorthChina CratonTheseintrusionscomprisemainlybiotitehornblendequartzdioriteandhornblendebiotitegranodioritewithabundantmafic 206 238 enclavesinfieldUPbdatingofzirconsfromthreesamplesbyLAICPMSyieldweighedmean Pb/ Uagesof2718±24Ma, 2714±13Maand2687±13Ma,respectivelyTheserockshaveSiO =6142% ~7173%,KO=310% ~511%,KO/ 2 2 2 # NaO=093~196,Mg=4254~4993,A/CNK=090~103,featuresofhighKcalcalkalineItypegranitoidsTheyalsoshow 2 strongenrichmentsinlightrareearth(LREEs)andlargeionlithophileelements(LILEs,eg,Cs,Rb,Ba,K,ThandU)and depletionsinhighfieldstrengthelements(HFSEs,eg,Nb,TaandTi)andheavyrareearth(HREEs),withweaklynegativeEu anomalies(Eu=055~095)Theprimarymagmaforgranitoidscouldbemainlyderivedfrompartialmeltingoftheuppercrust δ Themaficmicrogranularenclaves(MMEs)arebiotitediorites,characterizedbylowSiandK,enrichmentinFe,Mg,Ca,Ti,LILEs (Rb,Cs,Sr,U)andHFSEs(Nb,Ta,Zr,Hf)whencomparedwiththehostrocks,itsprimarymagmacouldbemainlyd
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