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10)(X569/2006/022(02)26576Aet。torzieasiniea’’.’zHANQQi’,JINWeijun’2,wANGYuanngl,LxCenDongZ4WANGYan,andJIAXiuQin`1.,1000292.,3001703.,4.,l;,J10X()391.￡`tu￡eof01andeGh”。,ChineseAeade;ofSeie~,Begn1000292.iTanlin￡i`uteofeC。g,andMi、ralResoucres,iTainln3001703.haartntofaEsc,~,hTonU。ltyofoHgngn,oHoKgn4.`itu￡eofigHhEnePhyS。,hCineseAeademyofsciences,Begn10X()3920051221,2006l24.ZhangQ,JinWJ,WangYL,LiCD,WangYandJiaXQ.2006.Amodelofdelaminationofcontinentallowercrust.AeatePotrlogieaSica,22《2):265276AbstarctIt15thesubjeetthatpeoplepayattentiontoeontinentaJlowererus`delamination·Thepaperputsootthatthearealleastthreeeonditionsforlowereurstdelamination:(l)thethiekenedeurst15thePreerquisitethatthedelaminationmakethel〔〕wereursteelogite.(2)theextensivemagmashiftsoutaIaeamountoflowdensityaeidmagma,enablestheerustdensitytobegreaterlhanthemantledensity.Beeausethelowererusteelogitationandsomemagmameltingareofthegeoehemistehaeteristies)fadakite,thelowererustdelamination15thePrerequisiteandessentialeonditionwiththeextensiveadakitemeltedout.(3)thattheIithospheremantletarnsfersintotheasthenoshperemantleenablestheIowererustintomantle.Themantleitndereontinenerusr15eoldandirgidityoirginally,diiffeulttoflow,andwillbesoftenwithheatandwaterjoining,makeintotheasthenosphereheat,plastieitya:、deasyflow.50thatthetransitionbetweenthelithospheremantleandtheasthenospheremantle15theessentialfaetorandpreeonditionofthelowererustdelamination.hTeauthorrhinksthattheerustwi]1notdelaminateasawholly,otheise,itwilldelaminateasthesnowflakefloatporbably.Ifthedensityofthelowererust15redueed(lowerthantheunderlyingmantle),andthere15notheatsupl)lyi,1mantle,andtheasthenosphereundereontinenterustturnintothelithospheremantleagain,delaminationwillstoppormptly.IrtheartielewediseussedthepossibilityoflowererustdelaminationintheeasternChinaduringMesozoieEra,andthethinningmeehani、l1`)fthelithosphere.Wethinkthatthelowererust15notneeess,15notpossibletodelaminatetogetherwiththelithospheremantle`、5well.Keyow5Continentallowererust,Delamination,Adakite,Lithospheiremantle.AshosPheiremantle,:()I。(2),,,。(3),,、,,,、、,。,,、(),,,、、,,;;;;5P42.5(KzCXI7KzCxZSw119)。:,,1937,,,Emial:hzang(li@mial.·a,.。《、.。266AetaPetroleaSinaic2(0,22(2),,、,(MenziesMA。tal.,1993;,1988,1992,1994;,1998;GriiffnWL。tal.,1998;,1999,2,2003;,20(;,999,2”;wuFY。taz.,Zoosa,b;,2005)。,,(Ga。S。tal.,1992,1998)。。,,,,,(,Zoola,b)。,,,,。,(),,,,(,1994,20()3;LI],1998;,1999,20X(),20()3,2《X;,2;,1999,2(X;RudniekRLandFountainDM,1995:JullMandKelemanPB,2X()l;Lustrin。M,20()5;WuFYe:al.,2X()sa)。,“+”。,“”。,。2:(l),,;(2),,;(3),,。,。,、、、(,1998;,1999;,2005)。,,;,,,。:(l),;(2),,;(3),。,,,,,。,,,。,。。(RpRPandWatsonEB,1991,1999;WolfMBandWylliePJ,1994)、lA、K,,(14GPa),(,2”)。,。,(1.OGPa),;(〕1.SGPa),。,l.SGaP,(,2003)。(2003),(10%40%),(),()。Holloehe:andRobinson(20()2),(10kb),;1022khar10%。,,,(IGPa),(23Gpa:WolfMBandWylliePJ,1994;RaPPRPandWatsonEB,1995;JullMandKelenlen111,20()l)。2.1,:(),,()、()();()(),2.2,(),。`l,,。,:267,,。,:(eonduetion)、(Conveetion)(adveetion)(,2005)。,,,,(,2005)。,,,,,(),,。,,,,,。,,,。,,。,,,:=+()(wolfMBandwylliePJ,1994),3.sg/em,(wofMBandwyllie,1993)。,(4050km),(XiongXLeral.,2005),(3040km,RudniekRLandFountainDM,1995;,1999),(aPtiDouceandMccarthy,1998)。,600MPa3.439em’3.29gem’(RudniekRLandFountainnM,1995)。(3.64.0em,,Haeker,1996)40%,3.5。,(wolfMBandwylliePJ,1993)。,(3.33.69cm’,RudinckRL,1995)。,,,。2.3,,。,,。,,。,,。,。2.3.1iNuYL(2005),、、、;、、、,。、,〕J,。.,,。,,。,,,(R;(ltJkRL,1995;MeissnerRandMooneyW,1998;J[111ManolKelemanPB,2001;,2000,2004;,20()3;WuYL。tal.,2005a)。2.3.2,r,,,,。,,,,。,,,,Jl?,l,.:J,(1999),,(,thermomeehanicerosion),、,(,。llemi(,aleorison)。(1999),,。,`j)iNuYIJ(2005),.,,/「,、、、J,。(1988,!992)J’,、,(iNuYL.2005)。`,」,/268AtcaPetrolog“,aSina2〕,22(2)(,1999)。,,,,、,。,。,,,。(3),,,,。“+”。,.。3,+?(delamination)Bidr(1978,1979),、,。(1997),,,,、,、、、,,,、(,1997)。3.1“+”()?,(,)。,,???,,:(1),,;,。,(、、),,。(2),(3.43.6cm’,0.20.4em’,ea。s。t。2.,2),(3.393.29cm’)。,,(50Zookm)(10km),,,。3.2?。,,,,,。,。,,、,(,)。?,,10km()。,,(,2X()4)。、(,1999)。,,。,,。,,,,。,,,。,:(1),;(2),,。3.3.`”(XuJr。tal.,2002;Ga。S。tal.,2X()3,2)4;,2《X),,F,(AnrdtNandGoldsteinS,1989;KaySMet.,1993;SpirngerWandSeekHA,1997;DeafntMJandKepezhinskasP,2X()l;ZegersETandvanKekenPE,20()1;XuJFeal.,20()2;Ga。5et。2.,2003,2〔x;,2;,2X()5;Lust`n。M,2005)。,.(),,。:(l),,;,,:269。,,,,,。(2),,?,??(3),,,,,。,,。(4)M,Mg#(0.4),(,2)。3.4、?,,:(l),,。,,,。(2),,,。(3),,(),。,,,,,,。,,、、、、、,。4,。,,(,ZO0la,b,2005;,20(;,2004;,2004)、(RappRpandWatsonEB,2002;,2004)K20、REEEu(DengJFeral.,1998,2004;,1996,2《X)4;,1999),4080km,50km(,2005;,2005)。3040km,,40km。,Iokm,。1(XX)km(,200la),10km,。,。(2003),。,?。,,(KayRWandKaySM,1993:,1996,2X()3;,1997;,2《XX).2004;zhouxMandLiWx,2000;,2002)。,,。?,?。(,1997;,2000,2003),。,,,,;,。,,。,,;,。,,,、(1997),、。、。l。,,,,,、,(,1997)。,,。:(l),,、(2),,.,,。5,,-。,?270AetaPetrolog“aSinica2,22(2),。。,(,2005)。5.1(,1990,1999;,2(X;,996,20(,200;3,199;9,20(;,2005;wuFY。taz.,Zoosa,b),(,200;2,2002),,。???。5.2,,SrYb。S:Yb(,2002;,2002;,2002;,2003;,2《X;,2;,2005;wuFYetal.,Zoosa)。,(,2002;,200;2,2),(2(X)(,Zoola,b)。DeafntMJ(2002),,,。,DeafntMJandDrummondMS(1990),DefainMJ(2002)(,2005)。,。,,,?,,,,。,MORB,(850℃),。,,