《Redefinition and Formation Age of the Tanjianshan Group in Xitieshan Region, Qinghai》.pdf

《Redefinition and Formation Age of the Tanjianshan Group in Xitieshan Region, Qinghai》.pdf

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《Redefinition and Formation Age of the Tanjianshan Group in Xitieshan Region, Qinghai》.pdf

Vo1.88No.2PP.394-409 ACTAGEOLOGICASINICA (EnglishEdition) Apr.2014 RedefinitionandFormationAgeoftheTanjianshanGroup inXitieshanRegion,Qinghai LIANGXinquan ,,FU Jiangang,2WANGCe一 JIANG Ying’2ZHOU Yun , , YANGYongqiang .W G ZeliandP Chuanchuj 1StateKeyLaboratoryofIsotopeGeochemistry,GuangzhouInstituteofGeochemistry,ChineseAcademyof Sciences,Guangzhou510644Guangdong,Ck,!ina 2 iversityofChineseAcademyofSciences,Beijing100049,China 3ChinaUniversityofGeosciences,Beijing100083,China 4ShandongUniversityofScienceandTechnology,Qingdao266510,Shandong,China 5ChangshaDepositSurvyeCentre,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences, Changsha410003,Hunan,China Abstract:TheTanjianshanGroup。whichwaspreviouslydividedintoa,b,canddformations,hasbeen controversialforalongtime.ItmainlydistributesinthenorthernmarginofQaidam Basinandisan important early Paleozoic greenschistfacies metamorphic volcanic sedimentary rock ofrmation. Detafled field investigation and zircon LA..ICPM S U--Pb datingofthekeystrata suggestthatthe originallowerpartofaFormation(a-1)versustheoriginalmiddleupperofdFormation(d-3andd-4), theoriginalupperpartofaFormation(a-2)andbFormationversustheoriginallowerpartofd Formation (d一1andd.2)ofTanjianshanGrouparecontemporaneousheterotopicfaciesvolcanic- clasolitedeposit.respectively.Theformerofr·mationsformedduringthemiddle—lateOrdovician(463— 458Ma),whilethelatteronesofrmedinthelateOrdovician(about445Ma).Theoriginalcofrmation ofTanjianshanGroup.whichofrmedafter430Ma。issimilartotheMaoniushanFormationofKunlun MountainsandnorthQaidam Basin.Accordingtotherulesofstratigraphicdivisionandnaming,new stra

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