Magnetic basement depth from high-resolution aeromagnetic data of parts of lower and middle Benue Trough (Nigeria) using scaling spectral method

Abdullahi, Mukaila; Kumar, Raj; Singh, Upendra

doi:10.1016/j.jafrearsci.2018.11.006

Cited by 23 publications

(18 citation statements)

References 46 publications

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“…The study area is made up of the cretaceous Benue trough, Precambrian basement Complex, Sedimentary Basins (Gongola and Yola Basins), Jurassic younger Granites, and tertiaryrecent sediments of the central and north-eastern Nigeria (Fig.3 and Fig.4). Several works (Salako 2012;Nur et al, 1999;Eletta and Udensi 2012;Abdulsalam et al, 2013;Ikumbur et al, 2013;Igwesi and Umego 2013;Bello et al, 2017;Mohammed et al, 2019;Abdullahi et al, 2019) have been done in parts of the, north central, north eastern Nigeria but they are all restricted or localized to small areas around hot springs and a few on regional scale in the present study area ( Fig.1and Fig.2). The geology of the study area is made up of the cretaceous Benue trough, Precambrian basement Complex, Sedimentary Basins (Gongola and Yola Basins), Jurassic younger Granites, and tertiaryrecent sediments of the central and north-eastern Nigeria (Kogbe 1989;Ekwueme, 1987;Reyment, 1965;Carter et al, 1963;Farnbauer and Tietz, 2000;Adelana et al, 2008).…”

Section: Introductionmentioning

confidence: 70%

Investigation of Geothermal Energy Potential of Parts of Central and North-Eastern Nigeria Using Spectral Analysis Technique

Odidi

Mallam²,

Nasir³

2020

FJS

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The current study deals with an estimate of the Curie point depth, heat flow and geothermal gradient from spectral analysis of aeromagnetic data covering an area located approximately between latitude 7.5o N to 11.5o N and longitude 7.5o E to 10.5o E, which corresponds to parts of the Benue trough (lower part of the Upper Benue trough, the entire middle Benue trough, and upper part of the Lower Benue trough), lower part of the Gongola and Yola Basins, the Precambrian Basement, the Jurassic Younger Granites and two prominent hot Springs, Wiki hot spring in Bauchi state (in the north-eastern part) and Akiri hot spring in Nasarawa state (in the south-western part) of central and north-eastern Nigeria. Radially power spectrum was applied to the aeromagnetic data of the study area divided into 48 square blocks and each block analysed using the spectral centroid method to obtain depth to the top, centroid and bottom of magnetic sources. The depth values were subsequently used to evaluate the Curie-point depth (CPD), geothermal gradient and near-surface heat flow in the study area. The values of the curie point depths (Zb), range from 7.6341 km to 34.5158 km, with a mean value of 14.7928km, geothermal gradient, range from 16.8039 0C km-1 to 75.97490C km-1, with mean value of 45.7021 0C km-1 and heat flow (q), range from 42.0097 mWm-2 to 189.9372mWm-2, with a mean value of 114.2554mWm-2. Which reveals that, there might probably be good sources for geothermal and thereby further recommended for detailed geothermal exploration.

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Section: Introductionmentioning

confidence: 70%

Investigation of Geothermal Energy Potential of Parts of Central and North-Eastern Nigeria Using Spectral Analysis Technique

Odidi

Mallam²,

Nasir³

2020

FJS

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“…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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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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“…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%

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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Magnetic basement depth from high-resolution aeromagnetic data of parts of lower and middle Benue Trough (Nigeria) using scaling spectral method

Cited by 23 publications

References 46 publications

Investigation of Geothermal Energy Potential of Parts of Central and North-Eastern Nigeria Using Spectral Analysis Technique

Investigation of Geothermal Energy Potential of Parts of Central and North-Eastern Nigeria Using Spectral Analysis Technique

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

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