内蒙古阿拉善左旗巴音诺尔公花岗岩体TIMS锆石U-Pb年龄.pdf

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1、第35卷第4期地质通报Voll35．NO．42016年4月GEOLOGICALBULUTIN0FCHINAApt．，2016内蒙古阿拉善左旗巴音诺尔公花岗岩体TIMS锆石U-Pb年龄党智财，李俊建，赵泽霖，付超，唐文龙，王守光，赵丽君，刘晓雪DANGZhicai，LIJunjian，ZHAOZelin，FUChao，TANGWenlong，WANGShouguang3，ZHAOLijun，LIUXiaoxue1．中国地质调查局天津地质矿产研究所，天津300170；2．中国地质科学院研究生部，北京100037；3．内蒙古自治区地质调查院，内蒙古呼和浩特0

2、100201．TianjinInstituteofGeologyandMineralResources，ChinaGeologicalSurvey,Tianjin300170,China；2．GraduateSchoolofChineseAcademyofGeologicalSciences，Beijing100037，China；3．InnerMongoliaInstituteofGeologicalSurvey,Hohhot010020,InnerMongolia,China摘要：内蒙古自治区阿拉善东南部的巴音诺尔公花岗岩体，地处华北陆块西北缘，霍

3、尔森一查干楚鲁构造带以南的雅布赖一巴音诺尔公构造带内。岩体整体上受NEE向构造控制，主要由中一细粒黑云母花岗岩和中一粗粒似王证状黑云母花岗岩2种岩石类型组成。采用TIMS锆石u—Pb定年法，测得巴音诺尔公岩体不同位置中一细粒黑云母花岗岩和中一粗粒似斑状黑云母花岗岩样品年龄分别为304．7+2．8Ma和289．0+3．8Ma，属于晚石炭世一早二叠世。结合前人资料，提出巴音诺尔公岩体至少存在2期岩浆活动，分别为晚石炭世(304Ma)和早二叠世(289~272Ma)。关键词：阿拉善；巴音诺尔公；晚石炭世一早二叠世；TIMS锆石U-Pb年龄中图分类号：P588

4、．121；P597+．3文献标志码：A文章编号：1671—2552(2O16)04—0593-06DangZC，LiJJ，ZhaoZL，FuC，TangWL，WangSG，ZhaoLJ，LiuXX．TIMSzirconU—PbageofBayinnuoergonggran-iteplutonofAlxaBlock，InnerMongolia．GeologicalBulletinofChina，2016，35(4)：593—598Abstract：TheBayinnuoergonggraniteplutoninthesoutheastofAlxaBloc

5、kislocatedtothenorthwestofNorthChinaCratonanddistrbutedinYabula—BayinnuoergongtectonicbeltinthesouthofHuoershen—Chaganchulutectonicbelt，controlledgenerallybyNEE—trendingstrncture．Itconsistsofmedinmtofinegrainedbiotitegraniteandmediumtocoa~eporphyriticbiotitegranite．Re-searchersh

6、avedonesomeresearchontheagesoftheBayinnuoergonggranite，whichprovidesafavorableconditionforanalyzinganddiscussingwhethertheBayinnuoergongintrusionformedinmultiperiodicmagmaticactivities．TIMSU—PbdatingofzirconsfromtheBayinnuoergongmediumtofinegrainedbiotitegraniteandmediumtocoarse

7、porphyriticbiotitegraniteyieldedtWOagesof304．7±2．8Maand289．0+3．8Ma，respectively，indicatingthattheplutonshouldbetheLateCarboniferous—EarlyPermainintrusion．Combinedwiththepreviousresearchinthestudyarea，itisheldthatthereareatleasttwomagmaticactivitiesinthisarea，whichOC—cuffedinLate

8、Carboniferous(304Ma)andEaflyPermian(289～272Ma)．