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根据1999年在南黄海东部(122°～125°E)进行的地球物理调查研究结果,南黄海显示为三隆(起)两盆(地)的构造格局,重磁异常与构造吻合得较好,在盆地区,重力、磁力均以低而平缓的异常为主在隆起区,重力异常显示为高正异常,而磁力异常则显示为正负变化异常.地震地层资料表明南黄海中部隆起为新生代隆起区,小于1 km厚的Q+N地层之下即为古生代地层,缺失下第三系.勿南沙隆起与苏南隆起具有很好的连续性,表明它们实为一个地质单元.南黄海北部盆地是一个在晚白垩世发育形成,并以新生代沉积为主的新生代盆地.而南部盆地则是苏北盆地向海区的延伸,是一个以新生代为主的中新生代沉积盆地.由于郯庐断裂带的巨大左行平移运动,使得断裂带东盘产生大规模的北移运动,形成一个巨大的南北向拉张应力场,使得地壳拉张、旋转倾斜,并在地壳上部形成拉张盆地。
According to the results of geophysical surveys carried out in the eastern part of the South Yellow Sea in 1999 (122 ° ~ 125 ° E), the southern Yellow Sea shows the tectonic framework of the two basins (earthquakes) in Sanlong (upper), and the anomalies of gravity and magnetic anomalies are in good agreement with the structures In the basin area, gravity and magnetic force are mainly characterized by low and gentle anomalies in the uplift, gravity anomalies show high positive anomalies, and magnetic anomalies show positive and negative anomalies. Seismic stratigraphic data indicate that the uplift of the central part of the southern Yellow Sea is a newborn From the uplifted area, beneath the Q + N strata less than 1 km thick are Paleozoic strata, lacking Tertiary strata. The continuity of the No-Nansha uplift and the Southern uplift indicates that they are actually a geological unit. The northern basin is a Cenozoic basin which developed and formed in the Late Cretaceous and is dominated by the Cenozoic sediments, while the southern basin is a Mesozoic-Cenozoic sedimentary basin mainly dominated by the Cenozoic. The tremendous left-lateral translational movement of the Tancheng-Lujiang fault zone causes a large-scale northward movement of the east plate of the fault zone, forming a huge tensile stress field in the north-south direction that causes the crustal extension and rotation to tilt and form an extension in the upper part of the crust basin.