stages:laterjuraic-earlycretaceous,latercretaceousandoligcene-miocene.
northchinabasinandtalimubasininthenorthernpartofchinainpaleozoicarealllocatedinstablecraton,whoseareaisbigandinwhichthedepositionandstructureisstableandthesedimentarylayeristhin,whosegeothermalgradientandpaleotemperatureislow.tuloufanhamibasinandzhungeerbasinlocatedinhasakesitanplateunderwentexteionrift,theactivityofwhichissevereandthegeothermalgradientofwhichishigherthantalimuandnorthchinabasi.
inlatermesozoicthenorthernpartofchinaiseffectedbysurround
plateanditsactivityisintee.accordingtoactivity,itcanbedividedintofourunits(1).innortheastuniterlianandsongliaobasi,inwhichvolcanismissevereandcrustisrifted,formedajuraicandcretaceousfaultedbasinandthegeothermalgradientishigh.(2)innorthchinaunitordosbasin,qihuibasin,bohaiwanregion,inlatermesozoicgeothermalgradientofwhichwasevidentlyrising.ateastbohaiwanregionwasupliftingandcooling.atwestqihuiandordosbasinwasdepreingandthepaleotemperaturewasrising.(3)ontheeastofaerjinfaultinthealashanandhexicorridorareathejiuquanbaingrouandyingenbasinextendedfromjuraictoearlycretaceousandformedmanyfaultedbasi.thestructuralpatternofthefaultedbasiissimilartoerlianbasininnortheastchina,butvolcanicactivityisweakandgeothermalgradientishigh.(4)onthewestofaerjinfaulttuloufanhami,talimu,zhungeerbasiarealldepreionbasi,thegeothermalgradientsinlower,tuloufanhamibasiactivityissevererthantalimubasinandzhungeerbasin,thegeothermalgradientihigherthanthetwobasi.
inlatermes
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