胶莱盆地早白垩世瓦屋寿组砂岩中碎屑错石U-Pb-Hf同位素组成及其构造意义霍腾飞，杨德彬，许文良，王枫，刘海彬(吉林大学地球科学学院，长春,130061)摘要：木文报道了胶莱盆地莱阳群最底部瓦屋侖组长右右英砂岩中碎屑钻右的LA-TCP-MSU-Pb年代学和原位Hf同位索分析结果，进而约束了瓦屋裔纽砂岩的沉积时代和物源及其构造意义。碎屑铅右多数呈自形■半自形晶，发育岩浆生长环带，暗示它们为岩浆成内；少数晩三叠壯钻石呈均勻无结构的阴极发光特点，缺乏岩浆环带，暗示它们为变质钻石。82个谐和年龄的峰值分别为129Ma、158Ma、224Ma>253Ma、461Ma、724Ma、1851Ma和2456Mao上述定年结果结合原位Hf同位素分析表明：1)瓦屋奋组的沉积时代为129Ma——早白垩世；2)1851Ma、2456Ma年龄的钻右主要于华北克拉通前寒武纪基底岩右;新元古代(729・721Ma)岩浆钻石和晚三叠世(226・216Ma)变质钻右于苏鲁造山带；晚古生代钻石记录了华北克拉通北缘同时代的岩浆帝件；晚三亞世(231-223Ma)岩浆铅石和158-129Ma铅石则与胶北、胶东同时期的岩浆事件相对应;3)早侏罗世晚期之后鄰庐断裂带没有发生大规模的左行平移；4)瓦屋奇组中苏鲁造山带物源的存在，结合鲁西坊子组的物源H咅示，苏鲁高压•超高压变质岩右在中侏罗世早期(〜175Ma)已经出需地表。关键词：岩石学；碎屑鉛石；U-Pb-Hf同位素;物源;胶莱盆地；苏鲁造山带：P691」DetritalZirconU-Pb-HfisotopeofthesandstonefromtheEarlyCretaceousWawukuangFormationinthe激aolaiBasin,ShandongProvinceanditstectonicimplicationsHUOTengfei,YANGDebin,XUWenliang,WANGFeng,LIUHaibin(CollegeofEarthSciences,激linUniversity,Changchun130061,China)Abstract:WiththeaimofconstrainingthedepositionalagesandprovenancesofthefeldsparquartzsandstoneinWawukuangFormationanditsimplications,whichisbelievedastheearliestunitofLaiyangGroupin激aolaiBasin,itisundertookthattheLA-ICPU-PbdatingandinsituHfisotopeanalysistordetrialzircons・MostofthesedetritalzirconsfromthefeldsparquartzsandstoneinWawukuangFormationareeuhedral-subhedralinshapeanddisplayoscillatoryzoning,implyingtheirmagmaticorigin,whereasfewLateTriassicdetritalzirconsarestructureless,implyingtheirmetamorphicorigin.82zircongrainsyieldagepopulationsatca.129Ma,158Ma,224Ma,253Ma,461Ma,724Ma,1851Maand2456Ma.U-PbdatingandHfisotopicdataindicatethat:1)theWawukuangFormationdepositedduringtheEarlyCretaceous(〜129Ma);2)thedetritalzirconagesof1851Maand2456MaweremainlysourcedfromthePrecambrianbasementrocksoftheNorthChinaCraton;theNeoproterozoic(729-721Ma)magmaticzirconandtheLateTriassic(226-216Ma)metamorphiczirconwerederivedfromtheSuluterrane;TheLatePaleozoicdetritalzirconcouldberelatedtotheLatePalaeozoicmagmatismsinthenorthernmarginoftheNorthChinaCraton;theLateTriassic(231-223Ma)magmaticzirconandthezirconagesof158・129Maweresourcedfromthe激aobeiand激aodongigneousrocks;3)thelarge-scalesinistralstrike-slipmovementalongtheTan-LuFaultZonedidnotoccurafterlatestageoftheEarlyJurassic;4)theclasticsedimentfromSuluterranewasrecognizedintheWawukuangFormationaswellasintheFangziFormationinwesternShandong,implyingthattheSuluhighpressuretoultrahighpressureterranehasbeenexposedatthesurftice基金项目:新世纪优秀人才计划(NCET-12-0237)和高等学校博士学科点专项科研基金(20100061120002)共同资助作者简介：霍腾飞(198),男，硕士研究生，火成岩石学通信联系人：杨徳彬(1979-),男.副教授，岩石学.yangdb@jlu.edubeforethemiddleJurassic（~175Ma）.Keywords:petrology;detritalzircon;U-Pb-Hfisotope;provenance;WawukuangFormation;激aolaiBasin0引言造山带的沉积盖层山于构造隆升和风化剥蚀作川将其移除后，造山带木身降升•剥蚀形成的碎屑物可以记录造山带的隆升和折返历史［1,2］,特别是对紧邻造山...