Assessment of depth to magnetic sources using high resolution aeromagnetic data of some parts of the Lower Benue Trough and adjoining areas, Southeast Nigeria

Ekwok, Stephen E.; Akpan, Anthony E.; Ebong, Ebong D.; Eze, Ohara E.

doi:10.1016/j.asr.2021.01.007

Cited by 27 publications

(24 citation statements)

References 37 publications

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“…The second, which arises from a shallower ensemble of magnetic sources, dominates the high-frequency end of the spectrum. This statistical method of depth calculations has been proven to yield good estimates to the top of magnetic sources and have been applied by various authors [20,22,[43][44][45].…”

Section: Spectral Depth Analysismentioning

confidence: 99%

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Implementing Digital Edge Enhancers on Improved High-Resolution Aeromagnetic Signals for Structural-Depth Analysis around the Middle Benue Trough, Nigeria

2021

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Digital edge detector operations using magnetic derivatives in conjunction with spectra depth analysis were performed on high-resolution aeromagnetic signals to enhance the delineation and interpretation of depth, structural, and intrasedimentary features within the Middle Benue Trough (MBT) of North Central Nigeria, which could serve as a guide for mineral exploration. The derivatives revealed high-amplitude and short-wavelength anomalies over areas underlain by crystalline basement complexes, major volcanic zones, and aggregates of intrasedimentary volcanic and plutonic rocks. Geologic lineaments trending predominantly NE–SW and NW–SE, as well as minor trends of E–W and N–S, suggest that the area has undergone differential stress regimes across geologic time. The spectral depth analysis indicates a two-source depth model. The deep depth ranges from 1.9 to 6.1 km with an average of 3.9 km, whereas the shallow depth ranges between 0.3 and 1.9 km with an average of 0.8 km and is found to emanate from magnetic signals of post-Cretaceous near-surface igneous intrusions as well as other magnetized bodies embedded within the sediments. The spatial distribution of various hydrothermal minerals such as lead–zinc–barite deposits, as well as salt mineralization, is associated with the widespread Tertiary–recent magmatism and governed by pre-existing tectonic structures in the region.

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Section: Spectral Depth Analysismentioning

confidence: 99%

“…This implies that some prior knowledge of the targeted magnetic sources is required for optimal window size selection. Previous geophysical studies using magnetic and gravity data in various parts of the Benue Trough [21,22,45,48] estimated basement depths ranging from 2 to 9 km.…”

Section: Spectral Depth Analysismentioning

confidence: 99%

Implementing Digital Edge Enhancers on Improved High-Resolution Aeromagnetic Signals for Structural-Depth Analysis around the Middle Benue Trough, Nigeria

2021

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“…Conventionally, it is often used to determine sedimentary thicknesses for oil and gas exploration purposes. The false solution problems associated with different depth approximation techniques can be controlled by combining two or more depth determination procedures [11,12], or enhancing the signal/noise ratio through proper evaluation of the derivatives of the field [13].…”

Section: Introductionmentioning

confidence: 99%

“…Modern geoscience investigations in the Nigerian inland basins are centred on gravity, seismic, magnetic, paleoclimatography, geochemistry, aerial photography, source rocks and rock facies evaluations that have been studied by several researchers [11,26]. At the reconnaissance stage, the basement framework, depositional centres [27], and depth solutions [11,28] can be discerned from high resolution airborne magnetic data. Several researchers [11,[23][24][25][26][27][29][30][31][32][33] have investigated the thickness of sediments in the Cretaceous inland basins of Nigeria.…”

Section: Introductionmentioning

confidence: 99%

“…At the reconnaissance stage, the basement framework, depositional centres [27], and depth solutions [11,28] can be discerned from high resolution airborne magnetic data. Several researchers [11,[23][24][25][26][27][29][30][31][32][33] have investigated the thickness of sediments in the Cretaceous inland basins of Nigeria. In their separate studies, several depth solutions (1.5-12 km) were estimated involving different depth to basement procedures [11].…”

Section: Introductionmentioning

confidence: 99%

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Depth Estimation of Sedimentary Sections and Basement Rocks in the Bornu Basin, Northeast Nigeria Using High-Resolution Airborne Magnetic Data

et al. 2022

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This study involves the use of high-resolution airborne magnetic data to evaluate the thicknesses of sedimentary series in the Bornu Basin, Northeast Nigeria, using three depth approximation techniques (source parameter imaging, standard Euler deconvolution, and 2D GM-SYS forward modelling methods). Three evenly spaced profiles were drawn in the N-S direction on the total magnetic intensity map perpendicular to the regional magnetic structures. These profiles were used to generate three 2-D models. The magnetic signatures were visually assessed to determine the thickness of depo-centres and the position of intrusions. The thicknesses of sedimentary series based on source parameter imaging results are approximately ranged 286 to 615 m, 695 to 1038 m, and 1145 to 5885 m for thin, intermediate, and thick sedimentation, respectively. Similarly, the standard Euler deconvolution result shows thin (130 to 917 m), intermediate (1044 to 1572 m), and thick (1725 to 5974 m) sedimentation. The magnetic model of Profile 1, characterized by two major breaks, shows that the igneous intrusions and basement rocks are covered by sediments with thickness varying from 300 to <3500 m, while Profile 2 has a maximum estimated depth value of about 5000 m at the southern part. Furthermore, the Profile 3 model shows sediment thicknesses of 2500 and 4500 m in the northern and southern flanks of the profile, respectively. The maximum sediment thickness value from the various depth estimation methods used in this study correlate relatively well with each other. Furthermore, the anomalous depth zone revealed by the 2D forward models coincides with the locality of the thick sedimentation revealed by the source parameter imaging and standard Euler-deconvolution (St-ED) methods. The maximum depth values obtained from the various depth estimation methods used in this study correlated strongly with each other. The widespread occurrence of short-wavelength anomalies in the southern part of the study area as indicated by the jagged nature of the magnetic signature was validated by the analytic signal and upward-continuation results. Generally, it was observed that the southern part of the research area is characterized by thick sedimentation and igneous intrusions.

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Implications of tectonic anomalies from potential field data in some parts of Southeast Nigeria

et al. 2021

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Tectonic structures controlling mineralization in some parts of Southeast Nigeria were evaluated using airborne potential field data. High and low frequency filters and depth determination tools were adopted to evaluate short and long wavelength anomalies, resolve the spatial spreading of igneous intrusions, depths to geologic sources and basin topography. The high frequency results exhibited high concentration of short wavelength anomalies in the Obudu Plateau and Ikom-Mamfe Rift. The underlying main tectonics of the area elucidated by the low frequency results caused the widespread occurrences of short wavelength geologic structures that are revealed by the high frequency maps. The study area is characterized by comparatively thin (~13.0 to <3000 m) sedimentation. The observed thin thickness is as a result of the massive Precambrian basement outcrops in some locations in the Obudu Plateau and the proliferation of igneous intrusions within this part of the Lower Benue Trough. The 2-D models showed the undulating nature of the underlying basin topography, the location of intrusions, domal structures and related normal faults. The locations and neighbourhood of intrusions and/or short wavelength structures are viable sites for lead-zinc-barite, brine and metallogenic minerals.

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Assessment of depth to magnetic sources using high resolution aeromagnetic data of some parts of the Lower Benue Trough and adjoining areas, Southeast Nigeria

Cited by 27 publications

References 37 publications

Implementing Digital Edge Enhancers on Improved High-Resolution Aeromagnetic Signals for Structural-Depth Analysis around the Middle Benue Trough, Nigeria

Implementing Digital Edge Enhancers on Improved High-Resolution Aeromagnetic Signals for Structural-Depth Analysis around the Middle Benue Trough, Nigeria

Depth Estimation of Sedimentary Sections and Basement Rocks in the Bornu Basin, Northeast Nigeria Using High-Resolution Airborne Magnetic Data

Implications of tectonic anomalies from potential field data in some parts of Southeast Nigeria

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