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通过对新编1:100万航磁资料处理和三维反演,发现在苏鲁地区地壳深部约20~25 km处存在一规模巨大的呈北西方向展布的强磁性体,从郯庐断裂带西侧向东侧延伸,其埋深在断裂带两侧出现3~5 km的变化,东侧约为20km,西侧约为25 km,推测该磁性体为华北地块太古代变质岩系的残留体.这一磁性体的发现对于探讨苏鲁造山带构造模式和华北地块与扬子地块碰撞的缝合线位置以及认识郯庐断裂带东侧上层地壳向北推移底界滑脱面的位置等问题有重要的启示.
Through 1: 1 million new aeromagnetic data processing and 3-D inversion, it is found that there is a large-scale ferromagnetism spreading northwest in about 20 ~ 25 km in the deep crust of Sulu region. From the Tan-Lu fault zone It extends from west to east and varies from 3 to 5 km on both sides of the fault zone. The east side is about 20 km and the west side is about 25 km. It is presumed that the magnetic body is an Archean metamorphic series of the North China block The discovery of this magnetic body is of great significance to explore the tectonic model of the Sulu orogenic belt and the collisions of the suture between the North China block and the Yangtze block and the position of the upper crust on the east side of the Tanlu fault zone to the north The problem has important implications.