北黄海盆地构造运动学解析  

Analysis of structural kinematics of North Yellow Sea Basin

作　　者：李文勇[1] 曾祥辉[2] 王信国[3] 安战锋[1] 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083 [2]广州海洋地质调查局,广东广州510760 [3]中国矿业大学,北京100083

出　　处：《地学前缘》2009年第4期74-86,共13页Earth Science Frontiers

基　　金：国家重大科技攻关项目

摘　　要：以最新的地质-地球物理资料和北黄海盆地构造几何学特征为基础,采用盆地反演模拟与宏观分析相结合的方法,系统解析了北黄海盆地的构造运动学特征。研究表明,北黄海盆地在中、新生代时期经历了水平伸展、水平挤压、相对平移(走滑)以及垂直差异升降等几种运动型式,其中,水平伸展运动和垂直差异升降运动是北黄海盆地构造运动及形成演化的主体。水平伸展运动可以划分为J3—K1、E2和E3三个主要"伸展事件",并控制着盆地的成盆演化,其南北向伸展强度均东强西弱,东西向最大伸展强度自中生代到新生代由东向西迁移。水平挤压运动主要有晚白垩世和渐新世末—中新世初期两期。相对平移(走滑)运动伴随水平伸展运动和水平挤压运动发生,使多数NNE向、NW向断裂具有相对压扭或张扭平移(走滑)性质,其中尤以NNE向断裂更为明显。垂直差异升降运动具有"幕式"渐进之特点,晚侏罗世、早白垩世、始新世、渐新世以及中新世中晚期以来为沉降期,其中尤以始新世的沉降速率最大,晚白垩世、古新世、中新世早期为抬升剥蚀期;盆地的中、新生代沉降作用具有明显的自东向西迁移规律:东部坳陷以中生代沉降作用最为显著,中部坳陷主沉降期为始新世,而西部坳陷的快速沉降主要发生在始新世,并一直持续到渐新世。Based on the new geological-geophysical data and structural geometry of North Yellow Sea Basin, we have systemically analyzed the characteristics of structural kinematics of North Yellow Sea Basin using the associative method of basin inverse modeling and maeroanalysis for the first time. The result shows that North Yellow Sea Basin had undergone such movements as horizontal extension, horizontal compression, relative strike-slip, vertical differential elevation and subsidence, etc. During the Mesozoic and Cenozoic, in which horizontal extensional movements and vertical differential elevation and subsidence movements played the principal parts in the tectonic movements and in the formation and evolution of North Yellow Sea Basin. The horizontal extensional movements can be divided into three main extensional events-J3-K1, E2 and E3, which controlled the evolution of North Yellow Sea Basin, and the extensional intensities of south-north direction were all strong to weak from east to west, and the biggest extensional intensities of east-west direction migrated westward from the Mesozoic to the Cenozoic. There were two main stages of the horizontal compressional movements--the Late Cretaceous and the Late Eocene-Early Miocene. The relative strike-slip movements occurred with the horizontal extensional movements and the horizontal eompressional movements, which caused the majority of NNE-direction and NV;-direction faults to have the characteristics of relatively compresso-shear or tenso-shear strike-slip. These characteristics are more obvious for the NNE-direction faults. The vertical differential elevation and subsidence movements had the episodic-progressive feature. The Late Jurassic, Early Cretaceous, Eocene, Oligocene and Middle-Late Miocene up to now were subsidence stages, among those the Eocene had the biggest subsidence velocity. The Late Cretaceous, Paleocene and Early Miocene were the risingdenudation stages. The settling of this basin during the Mesozoic and Cenozoic had an obvious migration tendency fr

关 键 词：北黄海盆地 中 新生代 水平伸展运动 垂直差异升降运动 构造运动学 

分 类 号：P542[天文地球—构造地质学]