The study area is located in the south margin of the North China Block, the south end of the junction between the Ordos Block and the Hehuai Block, and is part of the Fenwei Graben System and the Shanxi Cenozoic fault basin in the central part of the North China Craton. The study area has a complex regional geological structure, intense tectonic movement, and frequent magmatic activities. Based on the latest high-precision aeromagnetic data, an integrated interpretation was completed by combining the regional geology, regional gravity, and magnetic susceptibility information. In this paper, the magnetic field characteristics and the relationship with the structure division are described in detail based on the block features in different zones of the reduction-to-the-pole aeromagnetic data. We showed that the different characteristics of the magnetic field depend on the concentrated reflection such as tectonic movement, magmatic activity, and stratigraphic distribution, and the fault structures were inferred and studied, especially the deep and large fault structures. The fault structures were distributed to the northeast (NE) and northwest (NW) directions. On the aeromagnetic map, faults are reflected as a boundary of different magnetic fields and aeromagnetic gradient belts. Under the interaction of NE and NW faults, an X-shaped fault structural system is formed. The NE faults control the magnetic field division, the sedimentary formation, magmatism, metamorphism, and mineral distribution, whereas the NW faults control the magmatism only. The NW faults are characterized by dislocation of NE faults, and the formation time of NE faults is earlier than that of NW trending faults. This study provides insight into the geophysical basis and reference for basic geological research and potential analysis for iron and other metal minerals in the study area in the future.

研究区位于华北地块南缘，鄂尔多斯地块与河淮地块交汇处南端，是汾渭地堑系和山西新生代断陷盆地中部的一部分。华北克拉通。研究区区域地质结构复杂，构造运动强烈，岩浆活动频繁。以最新高精度航磁数据为基础，结合区域地质、区域重磁、磁化率信息，完成综合解释。本文根据减极航磁资料不同区域的块体特征，详细描述了磁场特征及其与构造划分的关系。我们表明，磁场的不同特征取决于构造运动、岩浆活动和地层分布等集中反射，推断和研究了断层结构，特别是深大断层结构。断层构造分布在东北（NE）和西北（NW）方向。在航磁图上，断层被反映为不同磁场和航磁梯度带的边界。在NE和NW断层相互作用下，形成X型断层构造体系。NE断层控制磁场划分、沉积形成、岩浆作用、变质作用和矿物分布，而NW断层仅控制岩浆作用。NW断层的特点是NE断层错位，NE断层的形成时间早于NW向断层的形成时间。该研究为今后研究区铁等金属矿产的基础地质研究和潜力分析提供了地球物理基础和参考。