【作者】 魏斯禹； 滕吉文； 张致和； 胡忠义；

【Author】 We Siyu Teng Jiwen Zhang Zhihe Hu Zhongyi (Institute of Geophysics,Chinese Academy of Sciences)

【机构】 中国科学院地球物理研究所；

【摘要】 中国东部郯城-庐江大断裂在山东境内由4条主要断裂组成,宽达40-60 km,近来也有人认为可达80-100 km,现已证实,向北已基本跨过渤海与下辽河东侧断裂相连,向南跨长江,也有人认为过长江后伸入北部湾或海南岛以东之南海.本文主要是讨论北起下辽河地带向南到长江边上广济这一地段及其东西邻近地带的一些地球物理场特征,此区恰处华北地区.华北地区是我国政治、经济和文化的中心.这里是太平洋的西海岸,著名的北北东向郯庐大断裂中段在此通过,并与太平洋东海岸附近美国的圣安德烈斯大断裂隔着太平洋及其中脊而遥相对应.这条半隐伏的巨型构造带,经历了多期构造运动.就整个东部地区而言,由于主要受到太平洋板块向欧亚板块大陆下面俯冲的作用和影响,因而构成了一个在地质构造、岩浆活动和地球物理的深部要素上的一个独特地带,而华北地块恰在其中,其活动方式与性质又具有本身的特色.更多还原

【Abstract】 The deep structure and physical features of the medium in the crust and mantle are reflected directly by the geophysical fields,so they are very significant for the explanation of the origin of plate tectonics,earthquake,and mineralization.Based on the magnetic field,gravity anomalies,geothermal field,earthquake activities,fault plane solutions,stress field of crust, crustal deformation,crust and upper mantle structure,we have made in this paper a comprehensive study on the characteristics and features of those data obtained in this area,and then discussed the relation between them and Tancheng-Lujiang great fault. finally we have shown that the subduction of Pacific plate to Eurasian plate and the characteristics of the geophysical fields are probably the forming mechanism of Tancheng-Lujiang rift valley belt.更多还原