渤海湾地区中西部中生代构造特征及演化

应用周边露头资料、盆内钻井资料及地球物理资料，以板块构造理论为基础，以构造演化阶段论和活动论为指导，采用构造解析法对渤海湾地区中西部中生代各期构造变形场、构造应力场及沉积盆地进行了研究。研究结果表明，渤海湾盆地中西部中生界可划分为４个构造层：印支期构造层、燕山早期构造层、燕山中期构造层及燕山晚期构造层。成盆期主要经历了早中三叠世大型陆内坳陷盆地、早中侏罗世河湖沼相中小型坳陷盆地、晚侏罗世—早白垩世陆内小型裂陷盆地及晚白垩世隆起背景上形成的小型坳陷盆地等。造山期经历了印支晚期（Ｔ３）准造山作用、燕山早期（Ｊ２末）强烈造山作用及燕山晚期（Ｋ２）准造山作用３个演化阶段。中生代构造样式以挤压褶皱、逆冲构造及张性正断裂为主，其次发育横向调节构造。燕山运动早期对本区作用最大，奠定了本区北北东向的构造体系。中生代构造演化型式与欧亚板块东部的伊佐奈畸板块的相对运动方式密切相关

EVOLUTION AND STRUCTURAL CHARACTERISTICS OF THE MESOZOIC ERA IN THE CENTRAL-WEST PART OF BOHAI BAY AREA

he structural deformation field, stress field and sedimentary basins of the Mesozoic Era in the central\|west part of Bohai Bay area were studied with the tectonic analysis method. The study result shows that Mesozoic Erathem can be divided into four synthems of structural stages of Yinzhi,early Yanshan, mid\|Yanshan, late Yanshan. The sedimentary basins of he Mesozonic Era went through evolutionary stages of the major intra\|cratonic depression basin,the medium\|minor\|continental depression basin,the intra\|continental extensional basin, and the minor shrinkage depression basin. The structural styles of Mesozoic Era are mainly compression folds and extension, the second is transfer structure. The early Yanshan movement is more important in this area, and its direction of the compressive stress is from south\|east to north\|west. The structural evolution of the central\|west part of Bohai Bay is related to Izanaqi Plate movement.\=