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本文分两个部分。第一部分重点讨论了苏北新生代断陷盆地的区域构造特征。从同生断裂演化的角度,对各箕状断陷内部不同构造部位的形态、结构特征和形成机理作了初步分析。第二部分概括论述了苏北盆地局部构造的九点特征。据此分析认为,形成局部构造的应力不是水平侧向挤压,而是垂直上隆。并认为除了同生断裂“逆牵引”作用和基底因素以外,新生代频繁的岩浆活动对局部构造的形成有很大影响。此外并推断,白垩系浦口组(K_(2p))的塑性岩层流动上拱很可能是局部构造形成的应力来源之一。作者认为,苏北局部构造圈闭具有以下五种类型:“逆牵引”背斜;受基底控制又为“逆牵引”作用改造的构造圈闭;与岩浆活动有关的构造圈闭;与盐、泥塑性上拱有关的构造圈闭;古潜山型构造圈闭。
This article is divided into two parts. The first part focuses on the regional tectonic features of the Cenozoic rift basin in northern Jiangsu Province. From the perspective of syentemic evolution, the morphology, structural features and formation mechanism of different structural parts within each half-graben fault were analyzed. The second part summarizes the nine characteristics of the local structure in the Northern Jiangsu Basin. Based on this analysis, the stress that forms the local structure is not horizontal lateral extrusion, but the vertical uplift. It is considered that the magmatic activities of the Cenozoic have a great influence on the local tectonics in addition to the “reverse-pulling” effect of the syn-fault and the basal factors. In addition, it is inferred that the upper arch of plastic strata in the Cretaceous Pukou Formation (K_ (2p)) is probably one of the sources of stress in local structures. The authors believe that the five sub-structural traps in North Jiangsu are classified into the following five types: “reverse traction” anticline; structural traps controlled by the substrate and reversed by “reverse traction”; structural traps associated with magmatism; Mud plastic arch related structural traps; buried hill structure traps.