冀东地区冷口断裂重磁异常特征及其地质作用

CHARACTERISTICS OF MAGNETIC AND GRAVITY ANOMALIES OF LENGKOU FAULT IN EASTERN HEBEI AND ITS GEOLOGICAL FUNCTIONS

利用冀东地区1∶2.5万高精度航空磁测资料及收集的地面重力资料,阐述了冷口断裂及其两侧航磁、重力异常特征,并结合物性特征,分析了航磁、重力异常的地质成因及其对地质构造和矿产的控制作用。冷口断裂两侧航磁、重力异常特征差别十分明显,反映了两侧结晶基底、盖层和侵入岩分布规律差异较大,认为该断裂不仅控制了地质构造分布,也间接控制了矿产分布,可为地学研究和矿产勘查提供必要的地球物理依据。

Using 1：25000 high precision aeromagnetic survey data and ground gravity data collected in eastern Hebei area, the authors analyzed the characteristics of magnetic and gravity anomalies on both sides of Lengkou fault and, in combination with the characteristics of geology and mineral resources, explained the factors responsible for the aeromagnetic and gravity anomalies and their control over geo- logical structures and minerals. The characteristics of magnetic and gravity anomalies and the caprocks as well as the intrusive rocks are significantly different on the two sides of Langkou fault, so the authors infer that the fault not only controls the geological structure but also indirectly controls the distribution of minerals. The results obtained by the authors provide certain basis for geoscience research and mineral exploration.