中国东北地区晚古生代构造演化及后期改造

The Late Paleozoic tectonic evolution and later transformation in Northeast China

以深大断裂构造演化、地层及沉积岩相古地理分布及演化特征等为依据,将东北地区晚古生代主要构造单元重新进行了划分。东北地区晚古生代地层主要经历了晚海西期、印支期、燕山期3期较强烈的构造运动,其中晚海西期构造运动最强,构造样式为紧闭的褶皱及相伴生的逆冲断层。石炭-二叠系主要经历了两个大改造阶段:从晚二叠世末或早三叠世开始,一直到晚侏罗世,主要表现为挤压、褶皱、剥蚀改造;从早白垩世直到晚白垩世,为拉张断陷改造阶段。研究认为,中生代盆地叠加的地区,石炭-二叠系保存较好,是上古生界找气的战略区。

Based on tectonic evolution of deep major faults,stratigraphy and distribution and evolution of lithofacies paleogeography,we redivide major tectonic units in the Late Paleozoic in Northeast China.Late Paleozoic strata in Northeast China experienced three major tectonic movements,including the Late Hercynian,the Indo-Chinese and the Yanshanian movements.Among them,the Late Hercynian movement is the strongest and the tectonic styles are closed folds and associated thrust faults.The Permo-Carboniferous in Northeast China mainly experienced two major transformation stages.One is from the end of Late Permian or Early Triassic to Late Jurassic with the dominance of compression,folding and corrosion.The other one is from the Early Cretaceous to Late Cretaceous with the dominance of extensional rifting.Areas with overlapping Mesozoic basins have well-preserved Permo-Carboniferous,and thus are favorable gas plays in the Paleozoic.