北部海岸带(台州以北)航磁异常特征及断裂划分

为满足中国海岸带海陆统筹调查的需求,基于最新编制的中国北部海岸带(台州以北)1:50万航磁图件,利用逐点化极、延拓、垂向导数等数据位场转化处理,结合地质背景、物性资料和已有航空物探解释成果,对研究区磁场特征进行分析,分区探讨航磁异常成因,并编制北部海岸带(台州以北)断裂分布图.结果表明,海岸带地区磁性较强的岩石广泛发育...

Aeromagnetic anomaly characteristics and fault identification of the northern coastal zone (north of Taizhou)

In order to meet the needs of the coordinated land-sea geological survey of China's coastal zones, we calculated the aeromagnetic anomaly by reduction to the pole, analytic continuation, and vertical derivative based on the latest 1:500 000 aeromagnetic map of the northern coastal zone of China (north of Taizhou). Combined with geological information, physical property data, and existing results of aeromagnetic interpretation, we analyzed the magnetic field characteristic, and discussed the cause of aeromagnetic anomalies in subdivided regions, and identified the faults in the area. The results show that the magnetic rocks are widely distributed in the coastal zone, and the linear magnetic anomaly belts in the NE-NNE direction are the reflection of Mesozoic and Cenozoic acidic magmatic rocks, while the regional mass magnetic anomaly or wide and slow magnetic anomaly is the reflection of regional metamorphic rocks. The faults in the study area are well developed, and the main faults strike NE and NNE, followed by NW, in which the deep and large faults have an obvious controlling effect on the regional structure and magmatic activity. As the basic geological data with reliable quality, the "one Map" in this paper provides abundant geophysical information for solving the basic environmental and geological problems in the coastal zone. The fault division based on aeromagnetic data solves the problem of disconnection between land and sea faults in the special geographical environment, achieves the goal of overall planning between land and sea, and provides a basis for safety evaluation of major projects in the sea-land interaction area.