北黄海盆地东部M隆起构造特征及演化

北黄海盆地是中国东部近海中生代断陷型盆地,详细记载着中国东部复杂的构造活动信息,期间经历了多期岩浆活动和构造反转。M隆起位于北黄海盆地东部,其构造活动记录比周边的坳陷更为详细。为充分认识M隆起的地质结构及沉积响应关系,在充分利用地震、钻测井等资料的基础上,结合区域构造背景,从构造运动学和动力学等方面探讨分析其构造演化历程,进而为北黄海盆地乃至中国东部地区的构造演化提供新的依据。高精度三维地震资料及地质分析揭示,该隆起区发育有5个典型的不整合面,纵向上可划分为5个构造层。结合北黄海盆地所处构造位置、构造变形和沉积充填特征,及板块运动和区域构造演化史,将北黄海盆地东部M隆起自中侏罗世至今的构造演化划分为5个阶段(共9期):裂陷阶段(稳定沉积期、掀斜形成期、早白垩世凹陷沉积期)、构造反转阶段(晚白垩世抬升剥蚀期)、再次裂陷阶段(早渐新世初沉积期、早渐新世末剥蚀期、F2断层活跃期)、再次构造反转阶段(整体抬升期)、区域沉降阶段(区域沉降期)。

TECTONIC CHARACTERISTICS AND EVOLUTION OF THE M UPLIFT IN THE EAST AREA OF NORTH YELLOW SEA BASIN

The North Yellow Sea Basin, a Mesozoic rift basin, has experienced times of igneous activities and tectonic inversions and documented complex information on tectonic activities in the east of China. The M uplift lies to the east of the North Yellow Sea Basin and there the geological records are more detailed than those in surrounding depressions. In order to fully understand the relationship between geological structure and sedimentary response of the M uplift, recently acquired seismic data, well data and regional tectonic settings are integrated. In addition, tectonic evolutionary stages are discussed and analyzed according to the kinematics and dynamics of structure, aiming at providing new tectonic evolution evidence for the North Yellow Sea Basin, and even the whole east China. Recently acquired high resolution three-dimensional seismic data and the geological interpretation reveals that there are five typical unconformities on the M uplift which divided the sequence into five structural layers in vertical direction. Based on the integration of tectonic location, tectonic deformation, sedimentary filling characteristics, plate movement and regional tectonic evolution of the North Yellow Sea Basin, the evolution of the M uplift may be divided into five stages or a total of nine periods since Middle Jurassic:the rifting stage (the period of stable deposition, the period of tilting and the period of deposition in early Cretaceous); the tectonic inversion stage (the period of Late Cretaceous elevation and erosion); the further rifting stage (the depositional period of the beginning of early Oligocene, the denudation period by end of early Oligocene, the period of F2 activity); the further tectonic inversion stage (the period of integral elevation); and the regional subsidence stage(the period of regional subsidence).