【摘要】 本文据地质历史和构造变形对北京拗陷中、新生代构造演化及新构造运动和断裂活动性作了分析。地质历史分析表明北京拗陷在横向上介于京西隆起和大兴隆起之间的一个中新生代拗陷。在纵向上由几个相间排列的凹陷和凸起组成。中生代沉降中心表现出由北向南迁移,新生代以来则表现出自南向北迁移。从地貌水系所反映的构造运动来看,北京拗陷的中段和南段表现出间歇性均匀抬升性质,北段垂直差异运动明显。断裂活动时间在南段和中段主要为上新世和早更新世;北段活动时间可延续到晚更新世,甚至全新世。北段第四纪时新发育的断陷盆地可能与北西向断层的左旋走滑活动有关。更多还原

【Abstract】 Based on the analysis of geologic history and tectonic deformation, this paper has studied Meso-zoic and Cenozoic tectonic evolution, neotectonic movement and fault activities in Beijing down-warped basin. The analysis of geologic history shows that Beijing down-warped basin transverally lies between Jinxi and Daxing uplifts; longitudally, consists of several sags and upheavals between each other. The deposition centres characterize migration from north to South at Mecozoic,and from south to north since Cenozoic. In the light of the features of morphology and river system,we can recognize that the middle and south segments of Beijing down-warped basin characterize intermittent even elevation and the north sgment shows an obvious vertically differential movement. At the middle and south segments of the basin,the activities of the faults are more obvious during Pliocene and early Pleistocene periods. At the north segment,it can last to the late Pleistocene,even to Holocene. The de-yelopment of the new down-warped basin at Quaternary at the north segment of Beijing down-warped basin may be related to the left-lateral strik-slip movement of the west-north faults.更多还原