华北地台和秦岭—大别—苏鲁造山带的中生代花岗岩与深部地球动力学过程
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摘要
近年来的研究证实 ,华北地台和大别—苏鲁造山带的中生代花岗岩与同时代的镁铁质超镁铁质岩有类似的Sr、Nd同位素特点 ,许多花岗岩和火山岩还具有类似埃达克岩的地球化学性质。在此基础上 ,根据现已积累的大量Sr、Nd同位素资料 ,从整个华北地台岩石圈的角度论证了中生代岩石圈地幔富集的性质、富集地幔发生的时代及其形成机制 ,进而探讨了岩浆活动的动力学机制 ,指出本区岩石圈富集地幔的形成是在Pangea超大陆裂解时岩石圈大规模拆沉减薄 ,被拆沉的太古宙古老地壳重循环进入地幔改变了地幔成分所致 ,说明超大陆裂解、岩石圈大规模拆沉减薄和富集地幔形成之间有密切的成因联系 ,超大陆裂解伴随着大陆地壳生长和消亡 (重循环 )的大体平衡。结合全球地震层析资料 ,进一步探讨了由俯冲大洋残片转化的下地壳同古老克拉通地壳物质在花岗岩源区中的重要意义。
Recent studies suggest that the Mesozoic granitoids and the contemporary mafic and ultra-mafic rocks from the North China block and Dabie-Sulu orogenic belt have the similar Sr, Nd isotopic characteristics, and many of the granitoids and volcanic rocks exhibit some features of adakites. Based on these studies and the collected Sr, Nd isotope data, and from the viewpoint of the whole North China lithosphere, we have discussed the nature of the EMI-type enriched mantle, the time and the mechanism of the formation of the enriched mantle, and have further discussed the dynamic mechanism of the magmatism. We suggest that the enriched mantle was caused by the Archean crust-mantle recycling in the setting of a breakup of the Pangea supercontinent, which made the mantle composition changed. Integrating with the data of the global seismic tomography, we have also discussed the significance of lower crust transferred from subducted oceanic relics, and the old craton substance for the source of the granitoids.
Recent studies suggest that the Mesozoic granitoids and the contemporary mafic and ultra-mafic rocks from the North China block and Dabie-Sulu orogenic belt have the similar Sr, Nd isotopic characteristics, and many of the granitoids and volcanic rocks exhibit some features of adakites. Based on these studies and the collected Sr, Nd isotope data, and from the viewpoint of the whole North China lithosphere, we have discussed the nature of the EMI-type enriched mantle, the time and the mechanism of the formation of the enriched mantle, and have further discussed the dynamic mechanism of the magmatism. We suggest that the enriched mantle was caused by the Archean crust-mantle recycling in the setting of a breakup of the Pangea supercontinent, which made the mantle composition changed. Integrating with the data of the global seismic tomography, we have also discussed the significance of lower crust transferred from subducted oceanic relics, and the old craton substance for the source of the granitoids.
引文
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[2] ZHANGQi,WANGYan,QIANQing,etal.Thecharacteristicsandtectonic metallogenicsignificancesoftheadakitesinYanshanperiodfromeasternChina[J].ActaPetrologicaSinica,2001,17(2):236244(inChinese). [张旗,王焰,钱青,等.中国东部燕山期埃达克岩的特征及其构造成矿意义[J].岩石学报.2001,17(2):236244.]
[3] TARNEYJ ,JONESCE .Traceelementgeochemistryoforo genicigneousrocksandcrustalgrowthmodels[J].JournalofGeologicalSociety,1994,151:855868.
[4] QIANQing,ZHONGSunlin,LITongyi,etal.GeochemicalcharacteristicsandpetrogenesisoftheBadalinghighBaSrgrani toids:AcomparisonofigneousrocksfromNorthChinaandtheDabieSuluOrogen[J].ActaPetrologicaSinica,2002,18(3):275292(inChinese). [钱青,钟孙霖,李通艺,等.八达岭基性岩和高BaSr花岗岩地球化学特征及成因探讨:华北和大别苏鲁造山带中生代岩浆岩的对比[J].岩石学报,2002,18(3):275292.]
[5] GEXiaoyue,LIXianhua,CHENZhigang,etal.GeochemistryandpetrogenesisofJurassichighSr/lowY granitoidsineasternChina:Constraintsoncrustalthickness[J].ChineseScienceBulletin,2002,47(11):962968.
[6] LIUHongtao,SUNShihua,LIUJianming,etal.TheMesozoichighSrgranitoidsinthenorthernmarginalregionofNorthChi naCraton:Geochemistryandsourceregion[J].ActaPetrologi caSinica,2002,18(3):257274(inChinese).[刘红涛,孙世华,刘建明,等.华北克拉通北缘中生代高锶花岗岩类:地球化学与源区性质[J].岩石学报,2002,18(3):257274.]
[7] ZHANGQi,WANGYan,WANGYuanlong.PreliminarystudyonthecomponentsofthelowercrustineastChinaPlateaudur ingYanshanianperiod:ConstraintsonSrandNdisotopiccom positionsofadakite likerocks[J].ActaPetrologicaSinica,2001,17(4):505513(inChinese). [张旗,王焰,王元龙.燕山期中国东部高原下地壳组成初探:埃达克质岩Sr、Nd同位素制约[J].岩石学报,2001,17(4):505513.]
[8] JAHNBorming,WUFuyuan,LOChinghua,etal.Crust man tleinteractioninducedbydeepsubductionofthecontinentalcrust:GeochemicalandSrNdisotopicevidencefrompost colli sionalmafic ultramaficintrusionsofthenorthernDabiecomplex,centralChina[J].ChemicalGeology,1999,157:119146.
[9] ZHOUXinhua,ZHANGGuohui,YANGJinhui,etal.SrNdisotopemappingofLateMesozoicvolcanicrocksacrossnorthernmarginofNorthChinaCratonandimplicationstogeodynamicprocesses[J].Geochimica,2001,30(1):1023(inChinese). [周新华,张国辉,杨进辉,等.华北克拉通北缘晚中生代火山岩SrNdPb同位素填图及其构造意义[J].地球化学,2001,30(1):1023.]
[10] GUOF ,FANWM ,WANGYJ ,etal.LateMesozoicmaficintrusivecomplexesinNorthChinablock:Constraintsonthena tureofsubcontinentallithosphericmantle[J].PhysChemEarth(A),2001,26(910):759771.
[11] FANWM ,GUOF ,WANGYJ,etal.Post orogenicbimodalvolcanismalongtheSuluorogenicbeltineasternChina[J].PhysChemEarth(A),2001,26(910):733746.
[12] YANGuohan,MUBaolei,XUBaoliang,etal.CharacteristicsandimplicationsofNd,SrandPbisotopesandchronologyofPhanerozoicalkaline richintrusionsinNorthChina[J].Geologi calReview,2002,28(Suppl):6976(inChinese). [阎国翰,牟保磊,许保良,等.中国北方显生宙富碱侵入岩年代学和Nd,Sr,Pb同位素特征及其意义[J].地质论评,2002,48(增刊):6976.]
[13] LIUDY ,NUTMANAP ,COMPSTON ,etal.Remnantsof≥3800MacrustintheChinesepastoftheSinoKoreancraton[J].Geology,1992,20:339342.
[14] LUSongnian,YANGChunliang,JIANGMingmei,etal.TracingofPrecambrianContinentalCrustalEvolution[M ].Beijing:GeolPubHouse,1996.156(inChinese). [陆松年,杨春亮,蒋明媚,等.前寒武纪大陆地壳演化示踪[M ].北京:地质出版社,1996.1156.]
[15] WUJiashan,GENGYuansheng,SHENQihan,etal.Ar chaeanGeologicalCharacteristicsandTectonicEvolutionofChinaKoreaPaleoContinent[M ].Beijing:GeolPubHouse,1998.1212(inChinese). [伍家善,耿元生,沈其韩,等.中朝古大陆太古宙地质特征及其构造演化[M ].北京地质出版社,1998.1212.]
[16] BAIJin,HUANGXueguang,DAIFengyan,etal.Precambri anCrustalEvolutionofChina[M ].Beijing:GeolPubHouse,1993.1223(inChinese). [白瑾,黄学光,戴凤岩,等.中国前寒武纪地壳演化[M ].北京:地质出版社,1993.1223.]
[17] LIJianghai,HOUGuiting,QIANXianglin.Single zirconU PbageoftheinitialMesoproterozoicbasicdikeswarmsinHengshanMountainanditsimplicationforthetectonicevolutionoftheNorthChinaCraton[J].GeologicalReview,2001,47(3):234238(inChinese). ?
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