摘要
中国东北晚中生代经历了区域性的裂谷期、后裂谷热沉降期和反转期。从西向东可以分成海拉尔—二连、孙吴—松辽、三江三个裂谷带。裂谷期形成了１００多个断陷，其中大多数是断面东倾的半地堑，从西向东倾角有从大变小的趋势。后裂谷仅中带发生了幅度巨大的沉降。裂谷期的变形作用及其裂谷期和后裂谷期的沉降特点表明裂谷区发生了区域性的单剪拆离伸展作用。反转期发生冲断褶皱作用，变形从东向西应变减小。
NE China experienced regional rifting, post-rifting thermal subsidence and thermal reverse in Late Mesozoic. Three rift zones are recognized, i.e. the Haila’er-Erlian, Sunwu-Songliao and Sanjiang rift zones from west to east Only in the Sunwu-Songliao rift zone had large scale thermal subsidence occurred. More them 100 depression basins are formed during rifting, most of which are half-grabens with boundary faults dipping to the east or sonth-east and dip angles varying from high through low to high(from west to east). The depths of the half-grabens vary with the shallowest in the middle grabens and deepest to the west and east. Three stages of development of the rift system are recognized: 1)Late Jurassic to Early Cretaceous rifting by simple shearing; 2)large-scale post rifting subsidence only in Songliao rift zone; 3) positive inversion structures and thrust belts trending NNE-NE due to sinistral strike slip of the Tanlu super-wrench fault.
出处
《长春科技大学学报》
CSCD
1998年第3期266-272,共7页
Journal of Changchun University of Science and Technology
基金
国家"八五"重点科技攻关项目
美国石油地质学家协会项目
