【摘要】 敦化盆地位于敦密地堑中段,为受敦密断裂控制的裂陷-断陷叠合盆地。敦密断裂带在中、新生代发生了一系列构造体系的转换,即在晚三叠世启动,中晚侏罗世为挤压性质,白垩纪—古近纪具左行平移并有一定规模的拉张,古近纪末有一次挤压,新近纪以后又转变为拉张状态。敦密断裂带的演化对敦化盆地的生成、发展及演化起着主要的控制作用。敦化盆地在中新生代的演化过程为:晚侏罗世—早白垩世的挤压造山-走滑拉分-初始张裂阶段(裂陷发育阶段)、晚白垩世—古新世的回返隆升剥蚀阶段、始新世—渐新世的断陷盆地发育阶段以及新近纪之后的拗陷和玄武岩喷发阶段。各个演化阶段具不同的沉积响应特征。更多还原

【Abstract】 Dunhua Basin is located in the middle of Dunhua Mishan Graben.And it is a rift-fault depression superposed basin which is controlled by the Dunhua Mishan fracture zone.A series of tectonic system transitions happens during the Mesozoic and Cenozoic period in the Dunhua Mishan fracture zone.The transitions starts in the Late Triassic.In the Late Jurassic,it is compressional;during the Cretaceous-Paleogene,it has a left-lateral displacement and a certain scale of extension;there is a compression in the late Paleogene,which then turns into the extension state again after Neogene.The evolution of Dunhua Mishan fracture zone plays a controlling role in the generation,development and evolution of the Dunhua basin.The evolution of the Dunhua Basin in the Mesozoic-Cenozoic period is:the compressional orogeny,strike slip & pull-apart and the initial rifting stage in Late Jurassic-Early Cretaceous(rift development stage);the inversion,uplifting and exhumation stage in Late Cretaceous-Paleocene;rift basin development stages in the Eocene-Oligocene period and Depression and basalt eruption stage after the Neogene.Different evolution stages have different deposition response characteristics.更多还原