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本文对提取区域磁异常方法作了讨论。在对京津及周围地区航磁资料进行了一系列向上延拓基础上,提出区域磁异常可区分为上部区域异常及下部区域异常。它们分别与地壳的上、下磁性层对应。文中根据上部区域磁异常,对前寒武纪变质基底作了构造分区。根据下部区域磁异常,推测地壳下部磁性层受后期的中、新生代岩浆作用的影响很大。同时又探讨了第三类深部区域异常,推测其可能是莫霍面隆起所致。
This paper discusses the method of extracting regional magnetic anomalies. Based on a series of upward continuations of aeromagnetic data in and around Beijing and Tianjin, it is proposed that regional magnetic anomalies can be divided into upper anomalies and lower anomalies. They correspond to the upper and lower magnetic layers of the crust, respectively. According to the magnetic anomaly in the upper region, the Precambrian metamorphic basement was constructed. According to the magnetic anomalies in the lower region, it is speculated that the lower crustal magnetic layer is strongly influenced by the Mesozoic and Cenozoic magmatism in the later period. At the same time, the third type of deep area anomalies are discussed, which is supposed to be due to the Moho uplift.