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<p>This study investigates the geodynamic processes governing mineralization in the North-Central Precambrian Basement Complex (PBC) of Nigeria, a geologically complex region rich in mineral resources. The research aims to map subsurface structures using aeromagnetic data to understand the fault systems, fractures, and geologic events controlling mineral deposition. Advanced geophysical techniques, including source parameter imaging (SPI), Euler deconvolution, analytical signal, and 3D inversion modeling, were employed to process and interpret the magnetic data. The residual anomaly map (RAM) shows both positive (8.67 to 132 nT) and negative (-136 to -5.7 nT) magnetic anomalies, indicating structural variations such as faults and fractures. The first vertical derivative (FVD) map reveals magnetic anomalies that likely correspond to intrusive bodies or changes in the magnetic mineral content of rocks. The tilt derivative (TDR) analysis highlights intense faulting, predominantly trending NNE-SSW, with minor E-W trends. SPI results identify two depth models: a shallow model (-99.1 to 16.7&#xa0;m) and a deeper model (200 to 371&#xa0;m). Euler deconvolution calculations reveal geologic structures, including dykes and sills, oriented in an east–west direction, associated with Pan-African orogeny deformation. Depths of these sources range from 0.76 to 16.7&#xa0;km. The 3D inversion model uncovers subsurface structures that may host significant mineralization. Areas of related geologic setting can benefit from using similar methods for mineral exploration. This research emphasizes the importance of detailed subsurface structural mapping for identifying mineralized zones, offering critical insights for mineral exploration in the region.</p>

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Subsurface structural mapping a tool in understanding the Geodynamics of Mineralization within the North-Central Precambrian Basement of Nigeria, using aeromagnetic dataset

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Ayatu Ojonugwa Usman,
  • Joseph Sunday Nomeh,
  • Ema Michael Abraham

摘要

This study investigates the geodynamic processes governing mineralization in the North-Central Precambrian Basement Complex (PBC) of Nigeria, a geologically complex region rich in mineral resources. The research aims to map subsurface structures using aeromagnetic data to understand the fault systems, fractures, and geologic events controlling mineral deposition. Advanced geophysical techniques, including source parameter imaging (SPI), Euler deconvolution, analytical signal, and 3D inversion modeling, were employed to process and interpret the magnetic data. The residual anomaly map (RAM) shows both positive (8.67 to 132 nT) and negative (-136 to -5.7 nT) magnetic anomalies, indicating structural variations such as faults and fractures. The first vertical derivative (FVD) map reveals magnetic anomalies that likely correspond to intrusive bodies or changes in the magnetic mineral content of rocks. The tilt derivative (TDR) analysis highlights intense faulting, predominantly trending NNE-SSW, with minor E-W trends. SPI results identify two depth models: a shallow model (-99.1 to 16.7 m) and a deeper model (200 to 371 m). Euler deconvolution calculations reveal geologic structures, including dykes and sills, oriented in an east–west direction, associated with Pan-African orogeny deformation. Depths of these sources range from 0.76 to 16.7 km. The 3D inversion model uncovers subsurface structures that may host significant mineralization. Areas of related geologic setting can benefit from using similar methods for mineral exploration. This research emphasizes the importance of detailed subsurface structural mapping for identifying mineralized zones, offering critical insights for mineral exploration in the region.