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Structural trends and basement depths across Nigeria from analysis of aeromagnetic data
Journal of African Earth Sciences ( IF 2.3 ) Pub Date : 2021-03-11 , DOI: 10.1016/j.jafrearsci.2021.104184
Abel Uyimwen Osagie , Abdelhakim Eshanibli , Adekunle Abraham Adepelumi

This study analyses Aeromagnetic Survey Data to delineate magnetic lineaments associated with fault system trends across Nigeria. A High-Pass filter is used to separate the Total Magnetic Intensity's regional and residual components. A filter like Total Horizontal Gradient, Grid Analysis and Tilt Angle derivative are used to enhance the structural trends and fault systems that predominantly trend Northeast-Southwest and East-West. Some of the magnetic signatures on the southern and northeastern Nigeria follow the rift system trend that connects the South Atlantic and inland West Africa. The Euler deconvolution depth estimate of faults range between 1840 and 6321 m (meters) across the region. The Werner deconvolution and two-dimensional forward modelling are used to infer sedimentary thicknesses beneath ten profiles (each profile traverses a major river basin in the country). The estimated depths to basement range between 1500 and 7500 m beneath the Cross-River Basin (in the south) and the Gongola Basin (in the northeast). The Hadejia River Basin in northeast Nigeria is characterised by distinct magnetic anomaly lows and a shallow depth to the basement. Further investigation of this basin is recommended.



中文翻译:

通过航空磁数据分析,整个尼日利亚的结构趋势和地下室深度

这项研究分析了航空勘测数据以描绘出磁性线与整个尼日利亚的断层系统趋势有关。高通滤波器用于分离总磁强度的区域分量和残余分量。使用诸如“总水平梯度”,“网格分析”和“倾斜角导数”之类的过滤器来增强主要是东北-西南和东西-西趋势的结构趋势和断层系统。尼日利亚南部和东北部的一些磁特征遵循连接南大西洋和西非内陆的裂谷系统趋势。该地区断层的欧拉反褶积深度估计范围在1840至6321 m(米)之间。Werner反褶积和二维正演模型用于推断十个剖面以下的沉积厚度(每个剖面横穿该国一个主要流域)。在跨河盆地(南部)和贡戈拉盆地(东北)下方,估计的地下室深度在1500至7500 m之间。尼日利亚东北部的哈德加河流域的特征是明显的磁异常低点和地下室的浅层深度。建议对该盆地进行进一步调查。

更新日期:2021-03-16
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