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在北苏鲁超高压变质带(UHPM)上开展了深反射地震的同时,进行了大地电磁、地磁、放射性测量和重磁编图.本文介绍用这些方法取得的结果.两条区域性的地球物理剖面总长126km,经过二维反演取得了电阻率和磁性体剖面.结果表明:(1)大地电磁等综合地球物理资料与深反射地震剖面的推断结果基本一致,同样反映了UHPM岩块的俯冲折返与后期的隆升.(2)非地震地球物理资料不仅为地震解释提供约束,还可以提供地热流上涌、断裂和磁性体分布等更多的信息.(3)新发现莒南─海州北北西向断裂,对研究本区构造演化有重要意义.(4)根据地热流上涌、侵入体多和高波速体埋藏较深等特征,认为在本区进行科学钻探不够理想.
At the same time that deep reflection earthquakes were carried out on the UHPM in the North Sulu area, electromagnetic and geomagnetic measurements, radioactivity measurements and heavy and magnetic compilation were carried out. This article describes the results obtained with these methods. Two regional geophysical profiles total length of 126km, after two-dimensional inversion of the resistivity and magnetic cross-section. The results show that: (1) The synthetic geophysical data such as the magnetotelluric are basically the same as those from the deep reflection seismic profile, which also reflects the subduction and uplift of the UHPM block. (2) Non-seismic geophysical data not only provide constraints for seismic interpretation, but also provide more information about the upwelling, fracture and magnetic distribution of geothermal flows. (3) It is newly discovered that the north-northwest fault of Taonan-Haizhou area is of great significance for studying the tectonic evolution of this area. (4) According to the features such as upwelling of geothermal flow, intrusive body and deep burial of high-velocity body, it is considered that scientific drilling in this area is not ideal.