《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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