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埕宁航磁异常是鲁北地区规模最大,场值最高的一个异常,异常最大值达1430v,以500v等值线计,异常面积约480平方公里。 本文利用二维频率域滤波程序对17280平方公里的1/20万航磁和重力异常进行数据处理。 根据数据处理结果,分析推断得到异常区内格子状断块构造体系。利用对数功率谱估算埋深方法,估算得到基线和测线方向三层磁性体埋深剖面并分别推断其地质意义,估算得到埕宁航磁异常源埋深在600～700米之间。 结合数据处理结果及异常情况,圈定并划分区内地质体为四种不同磁性、密度体。只有埕宁航磁异常源属高磁性高密度体。综合分析物性和地质资料结果,推断埕宁航磁异常是由磁铁矿引起的,同时还存在风化淋滤型富铁矿的可能性。 文中最后提出进一步研究异常的建议。
埕 Ninghang magnetic anomaly is the largest in Lubei area, the field value of the highest an anomaly, the maximum anomaly of 1430v, with 500v isoline, the anomaly area of about 480 square kilometers. In this paper, we use the two-dimensional frequency domain filter program to process the data of 1/20000000 aeromagnetic and gravity anomalies of 17,280 square kilometers. According to the results of data processing, the fault block structure system in the abnormal zone is analyzed and inferred. The logarithmic power spectrum is used to estimate the buried depth. The buried and buried sections of the three layers of magnetic body in base line and line direction are estimated and their geological significance is estimated respectively. The magnetic anomaly source depth of Yingning is estimated to be between 600 and 700 meters. Combined with data processing results and anomalies, the geologic bodies in the area are delineated and divided into four different magnetic and density bodies. Only 埕 Ning Hang magnetic anomaly source is high magnetic density body. Based on the comprehensive analysis of the results of physical and geological data, it is concluded that the magnetic anomaly of SUI is caused by magnetite, and the possibility of weathered leaching iron-rich ore is also existed. Finally, the paper puts forward suggestions for further study of anomalies.