您好,欢迎访问三七文档
当前位置:首页 > 商业/管理/HR > 企业文化 > 华南构造演化的基本特征
:2012-01-17;:2012-04-23:“973”《》(:2012CB416701),《—、》(:40972132)、《——》(:40634022)(:2008-I-01):(1951-),,,,。E-mail:lsshu2003@yahoo.com.cnGEOLOGICALBULLETINOFCHINA31720127Vol.31,No.7Jul.,2012SHULiang-shu,,210093StateKeyLaboratoryforMineralDepositsResearch,SchoolofEarthSciencesandEngineering,NanjingUniversity,Nanjing210093,Jiangsu,China:4,,。,,--。-,。—,--,,,。—,。,、,(),()。,,。,。—,、。:;;;;;:P542+.4:A:1671-2552(2012)07-1035-19ShuLS.AnanalysisofprincipalfeaturesoftectonicevolutioninSouthChinaBlock.GeologicalBulletinofChina,2012,31(7):1035-1053Abstract:Studiessuggestthatatleastfourstagesofregional-scaletectonicandmagmaticeventshavetakenplaceintheSouthChinablock,namely,geodynamicprocessesofNeoproterozoicandLateMesozoicactivecontinentalmargins,EarlyPaleozoicandEarlyMesozoicintracontinentalorogenies.TheCathaysiablockwasapre-NanhuabasementconsistingmainlyofNeoproterozoicrocksin-steadofastableoldland.Itexperiencedacomplexevolutionfromassemblythroughbreak-uptore-assembly.TheintracontinentalshorteningduringSilurianledtothestabilizationoftheunitedSouthChinacontinent.TheentireSouthChinaBlockwasunderashore-shallowsea-slopesetting,withnotranslithosphericfault,noregional-scalevolcanismandmantle-derivedmagmatismintheperiodfromSiniantoJurassic,duringwhichpolyphasetectonicandmagmaticeventsoccurredintheunitedSouthChinalithosphere.ItevolvedintoapartoftheLateMesozoicWesternPacificactivecontinentalmarginaftertheEarly-MiddleJurassictransformationfromTethysiantoPacifictectonicregimes.TheSouthChinalithosphereexperiencedpolyphasecontinentalgrowthduetothedomi-nantlateralaccretionofblockassemblyaccompaniedbyverticalgrowthofmagmaup-swarming.DuringtheCretaceous,theSouthChinabasinandrangetectonicsoccurredinthewesternshoreofthePacificOceanduetostrongintracontinentalextensioncausedbythenorthwestwardsubductionofthePacificOcean.Long-termintraplatetectonismandpolystagegraniticmagmatismprovidedSouthChinawithafavorableconditionofmetallization,formingvariouslarge-sizeoredepositsandresources.NeoproterozoicNanhuaPeri-GEOLOGICALBULLETINOFCHINA2012、、、、、、、。,,、、。、、,-。--,,,,,。,、、、、、,、、、,、、、、、,、、、、、、、、,-。、,。。,,,,。10,,,,。,,,,,。1。-,-,-,。(1),,、。NE—NEE--2,900Ma—。-,-。,28,。,;,,。9,,,、1500km,。,(、)、()、。、,、。,-。[1-2]。U-Pb,10[3]。,。,1.0~0.87Ga,、-I,[4-6]。,,、,0.8~0.7Ga。700Ma,(190Ma),5,,——,,,,。,—2,:。odandEarlyCretaceousweretwodominantstagesofmetallization,withvarioustypesoforedepositsbeingchieflyformedintheEar-lyCretaceousperiod.Keywords:platetectonics;intracontinentalorogeny;magmatism;metallization;tectonicevolution;SouthChina1036317,NWSEWE。()、()。,(),,,,[7]。2-2.1(1.0~0.80Ga):→-、、、、、、,。2.1.1,--()--()2(2)。[1],[4-6]。2,,(、、、)、(——)、、、。。,。,,,,,。,。200,10,、、()、()、。,9~10,891Ma±13Ma(LA-ICP-MSU-Pb)[8]、968Ma±23Ma(SHRIMPU-Pb)[9]970Ma±21Ma(U-Pb)[10]、930Ma±34Ma(Sm-Nd)[11]、935Ma±10Ma(Sm-Nd)[12](2)。2.1.2,。I、、、、、。,、、,,,,、,、,9,913Ma±15Ma905Ma±14Ma(SHRIMPU-Pb)[13]、891Ma±12Ma(SHRIMPU-Pb)[14]、893Ma±6Ma[15]。、、,、、。,,。,,,、。9~10,972Ma±8Ma(SHRIMPU-Pb)16]、996Ma±29Ma(U-Pb)[17](2)。[16]。2.1.32~3m[18],[19]。,0.9~1.3GPa,250~450℃,()[20]。K-Ar,2866Ma±14Ma[21](2)。2.1.4,,。20~30km,EW,800km,5~10km,NE,250km,。、、,,XZ、、、、“”、S-C。(3),NWSE,NE[4],()[6]。:1037GEOLOGICALBULLETINOFCHINA201210383172.1.5,9,10×104km2,、、,、、。。2.1.6,-[22]。-2,10,,、,,,、、,,1km2。,。、,,S[22]。U-Pb,850~800Ma(2)[23-28]。2.1.7,。,、、,、、,。,。--,、、、、,、、;、---,,,。、、,、、、、、。—,,。、,。2.2(800~680Ma):→2.2.1,-。,:1039GEOLOGICALBULLETINOFCHINA2012--,,。。--,;—,。,,,,—2。———,SN-,—,-。2——。,—、。,;。—-,,。,,—————,;———————,。。2.2.2SE—、。—:-、、、、、,、、、(2),、,、。、SHRIMPU-Pb,847Ma±8Ma795Ma±7Ma[5,29,30],U-Pb818Ma±9Ma[31],[5]。(810~760Ma):,(2)。,。,。U-Pb,,812Ma±5Ma[32];,794Ma±9Ma,792Ma±5Ma[33]。760Ma[33]。,,。NE、、-[34,5]SN[34]。680Ma,——。2.2.3(9~10),,(3-A)。8.7,,,,、,(3-B)。8.5~8.0,,,(3-C)。,Rodinia,,。,,(3-D)。,,,—,。7,,,5。2.2.4,。,、、、-,、、。[5],-2:()、。10403172.3-2.3.1-NE、,、、(1.7~1.8Ga)。[34-35,101],、,,。,,。-()、--()。,。,—IU-Pb,1.8~1.9Ga[36-37]。,,。[38-39],13~10,。,U-Pb0.8~1.0Ga[15-17]。,、。2.3.22(petrotec-tonicassemblages),。,,、、、,;—,,,。。2。,,。900U-Pb[38-39],5,2.56~2.38Ga(2.46Ga)、1.93~1.52Ga(1.7Ga)、1.3~0.9Ga(0.97Ga)、0.85~0.73Ga(0.78Ga)、0.68~0.55Ga(0.65Ga),133.0Ga—(23.96Ga),—。,2.46Ga;,。1.93~1.52GaColumbia-。0.97GaRodinia,ColumbiaRodinia2。0.85~0.73GaRodinian,。0.65Ga,。,,。-—U-Pb,6,850~800Ma[5,29-30](2),—。,2[5]:972Ma±8Ma,;850~800Ma、,。2.3.3—,,、、3。,—()。。-,、,,—(4)。、。,,。、,、,——[40]。,,,[35]。,:1041GEOLOGICALBULLETINOFCHINA2012。[34-35,101]。2.3.4,,。—。,、、、,67%[40]。,EWNE,SNNW,、、。。,—,SESE,NWNW[41],1042317:(5,A-B),NW,Rong[42-44]。,,,—(-),,、、、。2.3.5,,100,2×104km2。S(、、),。30U-Pb,440~390Ma[40,45-46](4),—。,εHf[46]。,、、、、、、,,;,、、S-C。Ar-Ar,440~390Ma[41,47],-。,,,,、。2.3.6。,-。、、。,。,,,,。、。-,。2.3.7。(10~9)、;(8.5~6.8)-,,NE。—,,(4、5)。,,,-、,、、—-,、,(5)。-。1043GEOLOGICALBULLETINOFCHINA20122.4--2.4.1—[30],,。—,—,-、-、-。,,;—,,,(6)。NESW,、;,。—,,-,、、。[48],。,,—,,[40]。2.4.2—-—,-。,,EW[49-50]。,---,、、[51-53]。SW,NE,。,—,(reworking)。,-、S,。、、、、-。NW,;-,[66];,340~50kmEW;,,;,。,Ar-Ar240~200Ma[41,47,54-55],U-Pb250~205Ma[56]。。NW—SE,EW。,--EW;,EW30~40°,。2.4.3—。,(T3w)[57]。,(T3p)[58]。、,(T3z)(T3xy)(T3gn)(T3a)(T3w)(T3j)、,—[59-61];,(T3w)(Pt3ch)、[62]。,(T2-3h)。,,、。2.4.4-,,。,,。,、,,—。1044317:2.4.5(250~220
本文标题:华南构造演化的基本特征
链接地址:https://www.777doc.com/doc-5358794 .html