黄海深部结构与中朝—扬子块体结合带在海区位置的地球物理研究  

Deep structure and boundary belt position betweenSino-Korean and Yangtze blocks in Yellow Sea

作　　者：郝天珧[1] SUH Mancheol 刘建华[1] 阎晓蔚 CHOI Suckwon 姚长利[1] 刘少华[1] 戴明刚[1] 徐亚[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]韩国公州大学,公州314701 [3]Wisconsin University,Wisconsin,USA

出　　处：《地学前缘》2004年第3期51-61,共11页Earth Science Frontiers

基　　金：国家基础研究 973项目 (G2 0 0 0 0 46 7 0 1 ) ;国家自然科学基金资助项目 (4 0 0 740 2 1 )

摘　　要：以黄海及其邻区为研究对象 ( 32～ 4 2°N ,1 2 0～ 1 30°E) ,以研究区的空间重力异常、布格重力异常和地震层析成像数据为基础 ,在研究区中分辨出方向各异的主要断裂带并给出它们的分布。对在朝鲜半岛存在的一条近SN向分布的断裂带进行了重点讨论。根据重力数据、莫霍深度分布特点和层析成像的结果 ,认为该断裂带的两侧应属于不同的构造地质单元 ;提出该断裂带与五莲—青岛断裂带和济州岛南缘断裂带一起组成了中朝与扬子块体在黄海海区的边界结合带的认识 ;并推测在三叠纪的晚期 ,沿郯庐断裂带和该断裂带曾分别发生过左旋和右旋走滑。受SN向挤压应力的作用 ,(下 )扬子块体被平移嵌入到中朝块体之中。因此 ,两个块体在海区的结合带为一个巨大的“Z”Free-air and Bouguegravity anomalies and seismic tomography show major faults in the Yellow Sea and adjacent areas between 120°E and 132°E, 32°N and 42°N. It is inferred from the geophysical data in the study area that a fracture along SN direction near the west margin of Korean Peninsula can be a part of boundary between Sino-Korean and Yangtze blocks. The whole boundary in Yellow Sea is consisted of Wulian-Qingdao Fault, South Marginal Fault of Jeju Island and the West Margin Fault of Korean Peninsula. It is inferred that during late Triassic period the compression stress in SN direction facilitated the northward movement of Yangtze block, leading to sinistral slip along Tancheng-Lujiang fault zone in Eastern China and dextral strike slip along the West Marginal Fault of Korean Peninsula. The movement resulted in the insertion of the Yangtze block to the Sino-Korean block. So the boundary belt between the two blocks in Yellow Sea presents a giant Z-shaped pattern.

关 键 词：中朝—扬子块体边界结合带 黄海 深部结构 重磁异常 地震层析成像 

分 类 号：P31[天文地球—固体地球物理学]