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ID:52171965
大小:1.51 MB
页数:10页
时间:2020-03-23
《内蒙古四子王旗地区小南山辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义.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内蒙古四子王旗地区小南山辉长岩LA—ICP—MS锆石u—Pb年龄及其地质意义党智财,李俊建,赵泽霖,付超,唐文龙DANGZhicai,LIJunjian,ZHAOZelin,FUChao,TANGWenlong1.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,北京1000371.TianjinInstituteofGeologyandMineralResources,
2、ChinaGeologicalSueTianjin300170,China;2.GraduateSchoolofChineseAcademyofGeologicalSciences,Belting100037,China摘要:四子王旗地区小南山为内蒙古中部镁铁质一超镁铁质岩带内发育的一个中型铜镍铂硫化物矿床,辉长岩为含矿岩体的成矿母岩。岩石主量、微量及稀土元素分析结果表明,小南山辉长岩属于铁质镁铁质岩,具有拉斑玄武岩系列演化趋势,相对富集大离子亲石元素(Rb、Ba、U、Pb等)和亏损高场强元素(Nb、Ta、Ti),并具有轻、
3、重稀土元素分馏相对明显、轻稀土元素相对富集、重稀土元素亏损的右倾型稀土元素配分模式。采用LA—ICP—MS锆石u—Pb测年法,获得小南山辉长岩年龄结果为272.7±2.9Ma,代表了小南山辉长岩体的成岩成矿时代,属中二叠世。区域地质资料及微量元素特征表明,小南山岩体可能形成于板内构造环境。关键词:四子王旗;小南山辉长岩;中二叠世;板内;LA-ICP—MS锆石u—Pb年龄中图分类号:P588.124;P597+.3文献标志码:A文章编号:1671—2552(2O16)04—0583—1ODangZC,LiJJ,ZhaoZL,F
4、uC,TangWL.LA—ICP—MSzirconU—PbdatingofthegabbrofromXiaonanshan,SiziwangBanner,InnerMongolia,anditsgeologicalsignificance.GeologicalBuUe~nofChina,2016,35(4):583—592Abstract:LocatedonthenorthwesternmarginoftheNorthChinaCraton,SiziwangBannerbelongstectonicallytOBayunOb
5、omar-ginalrift.ItisaboutlOOkmawayfromthenorthofSolonkersuture.Amafic—ultramaficbeltisexposedincentralInnerMongolia,inEWextensionroughly300kmlongand30kmwide,comprisingafavorablemetallogenicbeltforCu—Ni(PGE)sulfidedeposits.ManyCu—Ni(PGE)deposits(orespots)havebeenfoun
6、dhereincludingtheXiaonanshanCu—Ni(PGE)deposit.TheXiaonanshanintrusionconsistsofgabbroandbelongstothetholetiiticseriesinpetrochemicalcomposition.Mostoftherocksarerelativelyan—richedinlargeionlithophileelements(1
7、,Ti),exhibitingright—in—clinedlinearREEpatternswithLR_EEenrichmentrelativetOHR_EE.LA—ICP—MSU—PbdatingofzirconsfromXiaonanshanore—bearinggabbroyieldedanageof272.7+2.9Ma,indicatingthattheplutonshouldbetheMid—Permainintrusion.AccordingtOthere—gionalgeology,combinedwit
8、hthegeochemicalfeatures,itmaybeinferredthattheintrusionmaybeassociatedwithintraplatetec—tonicsetting.Keywords:SiziwangBanner;Xiaonanshangabbro;Mi
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