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时间:2020-03-26
《蒙古国Oyu Tolgoi外围碱长花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义.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35卷第4期地质通报Vo1.35.No.42016年4月GEOLOGICALBULLETINOFCHINAApr.,2016蒙古国OyuTolgoi~bN碱长花岗岩LA—IcP—Ms锆石u—Pb定年及其地质意义唐文龙,李俊建,付超,党智财,赵泽霖2,OrolmaaDemberel。,TomurtogooOnongyn,DelgersaikhanAdiya,EnkhbatTserendashTANGWenlong,LIJunjian,FUChao,DANGZhicai,ZHAOZelin,OROLMAA
2、Demberel,TUMURTOGOOOnongyn。,DELGERSAIKHANAdiya,ENKHBATTserendash1.中国地质调查局天津地质调查中心,天津300170;2.中国地质科学院,北京100037;3.蒙古地质科学院,蒙古乌兰巴托211238;4.蒙古地质调查局,蒙古乌兰巴托2112381.TianjinCenterofChinaGeologicalSurvey,Tianjin300170,China;2.ChineseAcademyofGeologicalSciences,Bei
3、jing100037,China;3.MongolianAcademyofGeologicalSciences,Ulaanbaatar211238,Mongolia;4.MongoliaGeologicalSurve5Ulaanbaatar211238,Mongolia摘要:位于蒙古国OyuTolgoi超大型斑岩型铜一金矿床南20km的碱长花岗岩区,构造上处于西伯利亚板块南缘近东西向和北东向深大断裂所挟持的戈壁一天山古生代岛弧带内。利用LA—ICP—MSU—Pb同位素测年法对研究区碱长花岗岩中的锆石进行
4、高精度的年代学测试,获得Pb/U年龄加权平均值为286.00+0.91Ma,为早二叠世。研究区具有多期次成岩、成矿特征,本次定年不仅为该区多期次岩浆活动提供了直接的年龄证据,也为该区找矿指明了方向。关键词:锆石;花岗岩;OyuTolgoi;蒙古中图分类号:P588.121;P597+.3文献标志码:A文章编号:1671—2552(2016)04—0553—06TangWL,LiJJ,FuC,DangZC,ZhaoZL,OrolmaaD,TomurtogooO,DelgersaikhanA,Enkhbat
5、T.LA-ICP-MSzir-conU—Pbdatingofalkali—feldspargraniteontheperipheryoftheOyuTolgoideposit,Mongolia,anditsgeologicalsignifi-cance.GeologicalBuUeanofChina,2016,35(4):553—558Abstract:Thealkali一~ldspargraniteofthestudyarealocated20kmsouthofthesuperlargeOyuTolg
6、oiCu—Audeposit.Thetecton—icsettingoftheStUdyareabelongstOPaleozoicislandarczoneofGobi——Tianshancontrolledbyintersectionofthenear——latitudinalfaultandanobliquetransversefaultonthesouthmarginofSiberianplate.AsamplewascoHectedfromOnealkali一~ldspargranite,an
7、dCLcharacteristicsofzirconssuggestmagmaticorigin.LA—ICP—MSU—Pbdatingofzirconfromthesampleshowsthattheam-placingageis286.0+0.91Ma(MSWD1.4),belongingtOPermianperiod.Thestudyareaischaracterizedbymultiperiodicdiagenesisandmineralization.Theisotopeageprovides
8、notonlythedirectevidenceforthemultiperiodicmagmaticactivitiesbutalsothepros—-pectingdirectionforthestudyarea.Keywords:zircon;alkali——feldspargranite;OyuTolgoi;Mongoha收稿日期:2015—10—23;修订日期:2016—03—07资助项目:中国地质滤Ef面项目(编号:1212O1
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