TECTONICS OF THE DABIE OROGENIC BELT, CENTRAL CHINA-中国Betway体育网页登陆

摘要 TectonicallytheDabieorogenicbeltconsistsmainlyoftheDabieshanYanshanianupliftedzoneandtheBeihuaiyangVariscan-Indosinianfoldingzone.InthenorthboundaryadjoiningtheNorthChinaBlock,thereareanEarlyPalaeozoicophioliticmixtitebeltandtheHefeiMesozoic-Cenozoicfaultedbasinwhichoverlapsonthesuturebelt.InthesouthofDabieorogen,thereisasecondarytectonicunitcalledForelandthrust-faultedstructuralzonewhichwasmainlyformedbytheintracontinentalsubductionsduringMesozoicera.ThestudyshowsthattheDabieBlockisapartofmid-lateProterozoicpalaeo-islandarcatthenorthmarginofYangtzeBlock.DuringCaledonianperiod,asasubmergedupliftatthenorthencontinentalmarginofYangtzeBlock,theDabieBlockcollidedwiththeearlyPalaeozoicpalaeo-islandarcatthesouthmarginofNorthChinaBlock,resultingintheconvergenceoftheNorthandSouthChinaBlocksandthedisappearanceofoceaniccrust.Sincethen,large-scaleintracontinentalsubductionswerefollowed.DabieOrogenicBeltistheproductofoverlappingofYangtzeBlock,DabieBlockandNorthChinaBlockunderthemechanismofintracontinentalsubduction.IndosinianperiodistheperiodofchiefdeformationandhighpressuredynamicmetamorphismforDabieBlock,andYanshanperiodisthemainorogenicperiodinwhichtheremeltingofcrustcausedbybasementshearingresultedinlargescalethermometamorphism.ThepresenttectonicframeworkoftheorogenwasfinallyformedbytherapidupliftingoftheDabieshanmountainsandglidingsouthwards,whichresultinthedevelopingofthrustbeltonsouthsideandtheextensionaltectonicmovementonnorthside.

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TECTONICS OF THE DABIE OROGENIC BELT, CENTRAL CHINA

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