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ID:36778222
大小:2.31 MB
页数:16页
时间:2019-05-15
《南秦岭东河群碎屑锆石UPb年龄及其板块构造意义》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、10000569/2013/029(01)006782ActaPetrologicaSinica岩石学报南秦岭东河群碎屑锆石UPb年龄及其板块构造意义1,22,334毛世东陈衍景周振菊鲁颖淮1,22,334MAOShiDong,CHENYanJing,ZHOUZhenJuandLUYingHuai1中国人民武装警察部队黄金第十二支队,成都6117322中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广州5106403北京大学造山带与地壳演化重点实验室,北京1008714中国地质大学地质作用过程与矿产资源国家重点实验室,北京100083th
2、112GoldTeamofChinesePeople’sArmedPolice,Chengdu611732,China2KeyLaboratoryofMineralogyandMetallogeny,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China3KeyLaboratoryofOrogenandCrustEvolution,PekingUniversity,Beijing100871,China4StateKeyLaboratoryofGeologic
3、alProcessesandMineralResources,ChinaUniversityofGeosceinces,Beijing100083,China20121003收稿,20121215改回MaoSD,ChenYJ,ZhouZJandLuYH2013UPbagesofdetritalzircongrainsfromtheDongheGroupintheSouthernQinlingMicrocontinent:ImplicationsfortectonicevolutionActaPetrologicaSinica,29(1):67-82Ab
4、stractTheSouthernQinlingMicrocontinentisanimportanttectonicunitoftheQinlingorogenicbeltTheEarlyCretaceoussedimentarysequenceisusefultotracethetectonicevolutionoftheSouthernQinlingMicrocontinentandsedimentaryprovenancesDetritalzircongrainsfromtheEarlyCretaceoussedimentsinSouthernQinling
5、MicrocontinentyieldfiveUPbageclustersof2600~2300Ma,2050~1800Ma,1200~750Ma,650~400Maand350~200Ma,correspondingfivesupercontinentalevents,namelyKenor,Columbia,Rodinia,GondwanaandPangaea,respectivelyThezircongrainshaveverycomplicatedsources,butmainlyfromtheNorthernQinlingAccretionaryBelta
6、ndNorthChinaCraton,implyingthattheSouthernQinlingMicrocontinentwasapartoftheQinlingNorthChinaunitedcontinent,neverbeinganisolatedcontinent,duringLatePaleozoicTheyoungestagepeakconstrainedthatthesubductiondurationoftheMianLueoceanplatenorthwardlybeneaththeQinlingNorthChinaunitedcontin
7、entwas350~200Ma;andthatthecontinentalcollisionbetweentheYangtzeCratonandtheQinlingNorthChinaunitedcontinentbeganattheTriassicJurassictransition,andculminatedinJurassic,insteadofinTriassicorearliersuggestedinpreviousstudiesKeywordsDetritalzircon;UPbages;EarlyCretaceous
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