华北中部岩石圈磁场变化与岩石圈结构间的关系

The relationship between lithosphere magnetic field variation and lithosphere structure in the central region of North China

对2016—2019年华北中部地区(34.7°—41.1°N,110.3°—119.7°E)流动地磁矢量观测数据进行处理,得到连续3期岩石圈磁场年变化数据,并对岩石圈磁场空间分布形态进行分析。研究发现,磁异常分布与岩石圈结构之间有一定相关性,在太行山隆起以西、临清坳陷、鲁西断隆和鲁西断隆以东等主要结构单元表现出不同程度的差异性,但在各自单元内却呈现出较好的整体性,岩石圈磁场水平矢量H和东向分量ΔY要素分区特征较明显。从H矢量空间分布形态可以看出,高能量区多分布在太行山隆起以西和鲁西断隆周边。文水—日照ΔY要素剖面幅值变化形态与结构分区间对应较好,对主要结构单元ΔX、ΔY、ΔZ要素异常幅度均值和极值进行统计,结果表明,太行山隆起以西近期岩石圈磁场变化幅度最大,异常能量最强,其次为鲁西断隆及以东地区,而临清坳陷周边磁场变化相对较平稳。

This paper processed three issues of annual variation data of lithospheric magnetic field from 2016 to 2019 in the central region of North China(34.7°—41.1°N,110.3°—119.7°E)and analyzed the spatial distribution of the lithosphere magnetic field.The results showed that there is a certain correlation between magnetic anomaly distribution and lithosphere structure.Anomaly characteristics show some differences between main structural units but are generally consistent within the units,especially for the horizontal vector H and E-W componentΔY of the lithosphere magnetic field.The spatial distribution of the horizontal vector showed that the high-energy areas are mainly distributed in the West of Taihang uplift and around the West Shandong fault uplift and its East.The amplitude distribution of componentΔY of the Wenshui—Rizhao section corresponds well with the structural zones.According to the statistics of the mean value and extreme value of the abnormal amplitude ofΔX,ΔY,andΔZ elements in the main structural units,the variation amplitude of lithosphere magnetic field in the West of Taihang uplift in recent years is the most obvious,the next is the West Shandong fault uplift and its East,and the variation of lithosphere magnetic field around the Linqing fault zone is the most stable.