【摘要】 结合近几年来渤海湾盆地区深层地震勘探与解释的成果,重点论述了渤海湾盆地区燕山期构造特征与盆地原型,提出燕山期构造变形样式总体在纵向上可分为三个构造层,分别称为上部、中部和下部;横向上总体可分为三个构造带,西部为向西逆冲的薄皮逆冲带,中部为冲断-走滑带,东部为厚皮褶皱-冲断带,主体由两期挤压方向皆为NW-SE向的褶皱-逆冲变形形成;并将其演化分为三个阶段:燕山早期、燕山中期和燕山晚期.但是,渤海湾盆地区燕山期的构造变形特征和原型盆地有所变化,其空间上的差异是基底构造格局及其空间差异叠合的结果.综合其它研究结果还表明,渤海湾盆地区燕山期构造是在西太平洋大陆边缘弧的挤压构造背景下,陆内壳下拆沉和壳内挤出逃逸构造的综合动力作用下形成的.更多还原

【Abstract】 Combined with seismic prospecting and interpretation of the deep layer in the Bohai Bay Basin in recent several years, this paper describes that the Yanshanian structural features and basin prototypes of Mesozoic Bohai Bay Basin and proposes that the Yanshanian structure can be divided into three levels of the upper, the meddile and the lower in the vertical and into three belts of the westward imbricated-thrust-fold belt in the west, the thrust\|strike-slip-fault belt in the medium and the thickened fold-reverse-fault belt in the rear or east. These structures resulted from folding and thrusting of the same NW-SE shortenings during two stages. The Mesozoic tectonics is divided into three stages of the early Yanshanian, the medium Yanshanian and the later Yanshanian. However, the features of folding and thrusting and basin prototypes changed with the different spatial and temporal variation. Especially the structural difference derived from the structural difference of the crystalline basement and the different superposition of different satges of structures. Other evidences show that the Yanshanian tectonic setting under the Neozoic Bohai Bay Basin formed in the compressive setting of the western Pacific continental marginal arc and in the delamination of the sub-crustal lithosphereas well as the intra-crustal escape.更多还原