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.
出版日期
2002年01月11日(中国期刊网平台首次上网日期,不代表论文的发表时间)