东海北部及邻区的基底和构造区划

BASEMENT CHARACTERS & TECTONIC SUBDIVISIONS OF NORTHERN EAST CHINA SEA & ITS ADJACENT AREAS

通过野外观察及物探资料的处理和综合解释,以江绍断裂带为界将东海北部分出以北的扬子准地台区与以南的加里东褶皱带;另以丽水—海丰断裂及沿海四十米等深线断裂为界,划分出地质特征与两侧有异的海陆衔接带,其东侧又可分为海礁凸起和西湖凹陷两亚区。充分表现出东西分带与南北分块之特征。

Upon the basis of field trip and processing and interpretation of geophysic data the northern part of East China Sea basin is subdivided into Yangtze paraplatform to the north of Jiang-Shao fault and Caledonian foldbelt to the south.In addition,a transitional zone is defined bounded by Lishui-Haifeng fault and 40 meter contour,and is characterized by its geologic features pronounced different from those of the areas to the either side.The area to the east of the zone however could be further subdivided into Haijiao uplift and Xihu sag.These tectonic subdivisions reflect characteristic zonation of the basement there.