库鲁克塔格地区新元古代沉积物源分析_来自碎屑锆石年代学的证据_张英利

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1、1000-0569/2011/027(01)-0121-32ActaPetrologicaSinica岩石学报库鲁克塔格地区新元古代沉积物源分析:来自碎屑*锆石年代学的证据11222张英利王宗起闫臻王涛郭现轻11222ZHANGYingLi，WANGZongQi，YANZhen，WANDTaoandGUOXianQing1.中国地质科学院矿产资源研究所，北京1000372.中国地质科学院地质研究所，北京1000371.InstituteofMineralResources，ChineseAcademyofGeologicalS

2、ciences，Beijing100037，China2.InstituteofGeology，ChineseAcademyofGeologicalSciences，Beijing100037，China2010-04-18收稿，2010-04-29改回.ZhangYL，WangZQ，YanZ，WangTandGuoXQ.2011.ProvenanceofNeoproterozoicrocksinQuruqtagharea，Xinjiang:Evidencefromdetritalzircongeochronology.Act

3、aPetrologicaSinica，27(1):121－132AbstractTheQuruqtaghareaissituatedinthelinkageofSouthTianshanandTarimbasinwherewellpreservedsedimentaryrecords.TheBeiyixiFormationintheQuruqtaghareaisavolcanic-sedimentarysuccessionwhichconsistsofigneousrocksandsandstones.TheYukengouF

4、ormationischaracterizedbysandstonesandsiltstonesformedbyturbiditycurrent.DetritalzirconU-PbagesoftwosamplesfromthesandstonesweremeasuredbytheLA-ICP-MSmethod.Thesample09DPL25and09DPL41respectivelyrecords93and71agedata.Detritalzirconsofsample09DPL25fromBeiyixiFormatio

5、nwhosepeakageis821Maandsubordinatepeakageis861Maareprevalent.Andthemajorityofdetritalzirconsofsample09DPL41fromYukengouFormationisweighted-age768Ma(subordinate800Maand741Ma).BasedonCLimages，thereoccurredafewmagmaticeventsabout741Ma，768Ma，821Maand861Ma.Togetherwithth

6、eliteraturedata，itstronglysuggeststhatthebasementrocksintheQuruqtaghregionwereformedintheMeso-toNeo-Archeanperiod.DetritalzirconsindicatethattheprovenancesofBeiyixiFormationare761～847Ma，851～972Maand1808～2498MarocksandmainprovenanceagesofYukengouFormationare734～845Ma

7、，858～963Maand1708～2486Ma.KeywordsDetritalzircon;U-Pbgeochronology;Provenance;Quruqtagh摘要库鲁克塔格位于南天山和塔里木盆地接合部，保留相对较完整的地层记录。新元古代贝义西组主要为一套火山-沉积组合序列，育肯沟组为浊流成因的砂岩和粉砂岩组合。对取自两个地层的沉积岩样品，分别进行了碎屑锆石LA-ICP-MSU-Pb测年，并分别获得了93组和71组U-Pb有效年龄。其中贝义西组锆石U-Pb年龄主峰值为821Ma、次峰值为861Ma的碎屑锆石(761

8、～847Ma)具有显著优势，育肯沟组年龄值为768Ma(次峰值为800Ma和741Ma)的碎屑锆石比较集中，说明库鲁克塔格地区在741Ma、768Ma、800Ma、821Ma和861Ma有大规模的岩浆活动。10个太古代碎屑锆石年龄以及综合已有的研究成果，确认库鲁克塔格存在中-