南黄海古生代以来构造演化

TECTONIC EVOLUTION OF THE SOUTH YELLOW SEA SINCE THE PALEOZOIC

南黄海是奠基于下扬子地台前震旦纪变质岩基底之上一个多旋回盆地的叠覆,在成生发展及其后过程中经历了多期构造改造作用,盆地原型已不存在,形成现今复杂的地质构造面貌。根据国土资源新一轮大调查项目在南黄海获取的高品质的地球物理资料,结合钻井和相邻陆地的资料以及不同时期动力体系的作用、不同期次构造运动和变形的特点,将南黄海大致划分为4 个大的构造演化阶段:古生代—三叠纪海相盆地稳定演化阶段、中生代陆相盆地演化阶段、古新世—中中新世断陷盆地发育阶段和晚中新世以来区域沉降阶段。加里东运动使华南褶皱带与扬子地台南缘拼贴,形成广阔而稳定的后加里东地台;印支—早燕山运动使下扬子地台与华北地台的东南缘碰撞和挤压,形成了苏鲁造山带,在造山带南侧和中部隆起区之间形成黄北前陆盆地,中部隆起区以南为黄南断陷盆地。

The South Yellow Sea is a polycycle basin surperimposition forming on the pre-Sinian metamorphic rock basement of the Lower Yangtze Platform. The complex geotectonic features occur in the sea, and the proto-type basins can not been found after multiple-period tectonic reformation. Based on the data of new seismic profiles, wells, adjacent lands and the research of different periods dynamic systems, tectonic movements as well as deformation characteristics, the tectonic evolution of the South Yellow Sea can be divided into four principal stages: the Paleozoic-Triassic marine basin, the Mesozoic land basin, the Paleocene-Middle Miocene fault basin and regional depression since the Late Miocene. The south margin of the Lower Yangtze Platform linked with the South China Folded Belt during the Caledonian Movement, and the stable and wide Post-Caledonian Platform was formed. The Sulu Orogenic Zone raised between the Lower Yangtze Platform and the southeast margin of the North China Platform during the Indosinian-Early Yangshanian Movement. The Huangbei Foreland Basin was formed between the south side of the Orogenic Zone and the Central Uplift, and the Huangnan Fault Basin on the south of the Central Uplift.