【摘要】 以江山—绍兴、铅山—宜春等断裂带作为华南与扬子块体之间的边界结合带 ,这种认识目前已基本为大家所接受 .但是 ,这条边界结合带向东延伸入海之后的位置与去向一直是多年来研究的热点 .本文基于黄、东海研究区的地球物理数据 (空间重力数据、布格重力数据和地震层析成像结果 ) ,利用方向导数等处理方法 ,对研究区的地球物理数据进行处理 ,并对研究区的地球物理场进行了分析 ,划分出不同的区块 .结合研究区的磁力与地质资料 ,利用各种成图、成像技术 ,形成一系列分析图件 .在此基础上对华南与扬子块体之间的边界结合带进行了追踪 .研究结果认为 :该结合带的位置有可能比传统认识中自长江口至大黑山群岛的位置更向南一些 ,在杭州湾—长崎、对马海峡一线 ,并呈现向北略微凸出的弓形 .边界结合带在深度上属于深大断裂带 ,一直可以追索到上地幔的顶部 .与中朝与扬子块体之间的边界结合带相比较 ,本条结合带的踪迹不是十分清晰 .表明加里东运动之后 ,该结合带的运动明显减弱 .更多还原

【Abstract】 It is known that Jiangshan-Shanxing, Qianshan-Yichun faults etc., are the boundary belt between Yangtze and Huanan blocks in East China area, but extension of this belt in sea areas was not so clear. In light with Free-air and Bouguer gravity data and tomography result in Yellow Sea and East China Sea, various information on faults were obtained after the processing (upward, arbitrary horizontal direction derivative, wavelet transform etc,.) and geophysical features of research region were analysis. It can be divided into different small areas according to geophysical feature differences. The geophysical evidences on the boundary belt between Yangtze and Huanan Blocks are shown after comprehensive analysis on gravity, magnetic, tomography result and geological information. It is believed that the boundary combine belt is possibly from Hangzhou Bay extending to round Nagasaki, Tsushima strait. It shows arc sharp to the north. The tomography result shows that geophysical evidences of the boundary belt can be found in the depth of upper mantle. Geophysical traces of this belt were not clear comparing with the boundary combine belt between Sino-korea and Yangtze Blocks. We believe that the tectonic movement of this combine belt became weaken after Caledonian movement.更多还原