中国东部海域地质特征及一些重要大地构造界线在海区延伸的地质地球物理证据  

Basic geological characteristics of the East China Sea region and geological-geophysical characterization of some important tectonic boundaries in the region

作　　者：侯方辉[1,2] 朱晓青 张训华[1,2] 吴志强 郭兴伟[1,2] 祁江豪 温珍河[1,2] 王保军 孟祥君[1] HOU Fanghui;ZHU Xiaoqing;ZHANG Xunhua;WU Zhiqiang;GUO Xingwei;QI Jianghao;WEN Zhenhe;WANG Baojun;MENG Xiangjun(Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China)

机构地区：[1]中国地质调查局青岛海洋地质研究所,山东青岛266071 [2]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《地学前缘》2022年第2期281-293,共13页Earth Science Frontiers

基　　金：国家海洋地质专项(DD20190365,DD20190377);国家自然科学基金项目(91958210)。

摘　　要：本文通过对中国东部海域地质地球物理资料进行综合分析,特别是近十年来海洋区域地质调查最新采集的地球物理资料,梳理了研究区基础地质特征,探讨了陆区大地构造单元在海区的延伸。研究表明:渤海和北黄海为典型的华北型基底并发育华北型沉积盖层;南黄海为典型的扬子型基底并发育扬子型沉积盖层;东海陆架为华夏型基底,东部很可能发育晚古生代沉积盖层,其上叠置了晚三叠世以来沉积盖层。下扬子地块西侧通过左旋走滑的郯庐断裂带,东侧通过右旋走滑的朝鲜西缘断裂带揳入华北地块中,朝鲜西缘断裂带兼具走滑和俯冲带性质。整个朝鲜半岛无论从变质基底和沉积盖层来看都类似于华北地块。扬子地块在北侧和东侧都发育“鳄鱼嘴”式构造,扬子地块的下地壳向北、向东俯冲于华北地块之下,而上地壳则仰冲于华北地块之上。江绍结合带表现为宽50~70 km的NE向高磁异常条带,进入杭州湾后走向转为近EW向,经舟山群岛、大衢山岛及附近岛屿,过东海陆架虎皮礁凸起向东进入日本九州岛。虎皮礁凸起的岩石很可能类似于大衢山岛,为一套俯冲增生杂岩。Based on a comprehensive analysis of the geological and geophysical data of the East China Sea region, especially the latest geophysical data from the past ten years, the basic geological characteristics of the research area were sorted out, and the extension of the continental tectonic units in the sea area was discussed. The results showed that the Bohai Sea and the northern Yellow Sea are typical North China style basement where North China style sedimentary caprock is developed. The South Yellow Sea is typical Yangtze style oceanic basement and developed Yangtze style sedimentary caprock. The East China Sea shelf is Cathaysia type basement, and the eastern part is likely to have Late-Paleozoic sedimentary caprock overlaid by that of the Late Triassic. The western side of the lower Yangtze Block is wedged into the North China Block through the sinistral strike-slip Tanlu Fault Zone, while the eastern side is wedged through the dextral strike-slip fault zone in the western margin of the Korean Peninsula. The fault zone of the western margin of the Korean Peninsula has the characteristics of both strike-slip and subduction zones. The whole Korean Peninsula is similar to the North China Block in terms of metamorphic basement and sedimentary cover. The lower crust beneath the Yangtze Block is subducted north-eastward under the North China Block, while the upper crust is thrust upward over the North China Block. The Jiangshan-Shaoxing Suture Zone is a 50-70 km wide high magnetic anomaly belt in the NE direction. After entering the Hangzhou Bay, it turns to the EW direction, passing through the Daqushan Island of Zhoushan Islands then over the Hupi Reef Uplift of the East China Sea shelf to enter the Kyushu Island of Japan. The Hupi Reef Uplift is a set of subduction accretion complex, similar to the Daqushan Island.

关 键 词：地质特征 构造边界 基底类型 中国东部海域 

分 类 号：P542[天文地球—构造地质学] P736[天文地球—地质学]