周口坳陷东部及邻区构造演化

周口坳陷东部及邻区自古生代以来经历了多期构造运动。研究表明,晚三叠世末区内卷入了前陆变形,主要表现为一系列逆冲推覆构造及其伴生的宽缓褶皱。随着郯庐断裂带及其旁侧断裂系的大规模左行平移,早白垩世区内出现了走滑盆地,到早第三纪,区内由于广泛伸展活动而形成了大规模的断陷盆地,这些断陷盆地在晚第三纪初发生的喜山运动中,受压抬升、消亡。

Tectonic evolution in eastern Zhoukou Depression and its adjacent area

Eastern Zhoukou Depression and its adjacent area had experienced multi stage tectonic movements since Paleozoic. The research indicates that in late Triassic, the area came into foreland deformation which showed mainly a series of overthrust nappe structure and its associated broad fold. As the large - scale left lateral displacement of Tanlu fault zone and its side faults, strike - slip basin was appeared in the area in early Cretaceous. To early Tertiary, a large - scale fault basins were formed in the area due to wide extensional movements, which were pressured, lifted, and disappeared in Xishan movement occurred in late Tertiary.