An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

Raimi, Jimoh; Dewu, B. B. M.; Süle, P.

doi:10.4236/ijg.2014.53031

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…Following Oladunjoye et al (2016), the thermal effects of the emplacement of the basement rocks whose epeirogenesis is associated with the Pan African events may be possible cause of the curvilinear lineament observed in northern part of the study area. Finally, the lineament trends inferred in this study are consistent with the trends inferred from previous studies in the northern Nigerian basement complex (Olasehinde et al, 1990;Raimi et al, 2014;Salau et al, 2016).…”

Section: First Vertical Derivative Results (Fvd)supporting

confidence: 92%

Analysis and interpretation of high resolution aeromagnetic data over Kabo town and its adjoining areas, in Northwestern Nigeria

Suleiman¹,

Aku²,

Sanusi³

2019

Bayero J. Pure App. Sci.

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INTRODUCTION Geophysics is a subject of natural science is concerned with the physical processes and physical properties of the Earth and its surrounding space environment using the physics principles to the study of the earth's interior. It is therefore a threeof the principles of Physics to the Earth, Moon and Planets (Reynolds, Geophysics is applied to societal needs, such as mineral resources, mitigation of natural hazards and environmental protection. Geophysical survey data are used to analyze potential petroleum reservo deposits, locate groundwater and it also plays an essential role in the development of the theory of plate tectonics. The Earth acts like a large spherical magnet: it is surrounded by a magnetic field that changes with time and location. The field is generated by a dipole magnet (i.e., a straight magnet with a North and South Pole) located at the center of the Earth. The magnetic fields of geological bodies are superimposed on the background of the Earth's main field. Variations in magnitude and direction of this field influence both the magnitudes and shapes of local anomalies. The purpose of magnetic surveying is to identify and describe regions of the earth's crust that have unusual (anomalous)

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Section: First Vertical Derivative Results (Fvd)supporting

confidence: 92%

Analysis and interpretation of high resolution aeromagnetic data over Kabo town and its adjoining areas, in Northwestern Nigeria

Suleiman¹,

Aku²,

Sanusi³

2019

Bayero J. Pure App. Sci.

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“…Some anomalies with the same feature with the anomalies of the ring complexes were also revealed (indicated with question marks within white boxes) but without an associated surface manifestation (outcrop). These anomalies are believed to be intrusions, probably ring complexes without surface exposures, similar to that suggested by Ajakaiye [78] in the north eastern part of the province, Raimi [79] within the Ririwai sheet and by Mantovani, Dutra and Marangoni, Dutra, Louro and Mantovani in central Brazil [80][81][82][83]. The pattern/position of the unexposed ring complex and the approximate thickness of overburden covering it were clearly displayed on the 3D-Euler Deconvolution map.…”

Section: Discussion and Resultssupporting

confidence: 71%

Improved Mapping of the Structural Disposition of Some Younger Granite Ring Complexes of Nigeria Using High Resolution Aeromagnetic Data

Sabinus¹,

A²,

N³

et al. 2018

J Geol Geophys

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Surface and subsurface structural interpretation over a part of the Younger Granite province of Northern Nigeria using Aeromagnetic data was carried out to demonstrate the use of recently available high resolution aeromagnetic data in mapping precisely the Younger Granite. State of the art software packages were used in data reduction, processing/analysis and interpretation. Results of the aeromagnetic study show that the distinct magnetic anomalies clearly revealed in the area coincide spatially with outcropping ring complexes. Apart from outcropping ring complexes, some ring complexes without surface exposures (unexposed ring complexes) were also delineated. One of such ring complexes was studied in greater details and its lateral dimensions with that of the adjoining ring complexes were better resolved. The unexposed ring complex was found to have a surface area extent of approximately 169.5 km 2 which is similar to that of Ririwai (180 km 2), Banke (128 km 2), Kudaru (174 km 2) and Zuku (121 km 2). The results of the 3D Euler solutions indicate that the depths of the ring complexes range from outcrop to 1800 m. For the inferred unexposed ring complex, the depth ranges from 5 to 1200 m. The Younger Granites show low Source Parameter Imaging (SPI) depth values of about 4 km below the sea level indicating deeper magnetic sources. Three (3) profiles drawn along the NE-SW, NNW-SSE and E-W directions on the Analytic Signal map of the study area gave an overburden thickness of less than 20 m that masked the unexposed ring complex with its mappable root situated at approximately 200 m below the sea level. The Ririwai, Tibchi, Banke, Amo, Kudaru and Zuku ring complexes have outcrops of approximately 1300 m, 950 m, 920 m, 1400 m, 1150 m and 1220 m respectively above mean sea level with their mappable roots situated at approximately 400 m, 180 m, 400 m, 800 m, 10 m and 300 m respectively below the sea level. It delineated numerous lineaments as structural features whose major trend is along the NE-SW direction. It was equally observed that the ring complexes of Northern Nigeria display diverse surface plans/shapes and exhibit both inward and outward dipping structural orientations with depth. The likely reason for the unexposed nature of the newly proposed ring complex could be as a result of partial subsidence of the enclosed block on which the extrusive edifice of the central volcano originally rested probably occasioned by excess space (much subsurface accommodation) for continuously rising magma within the country rock. Its geometry is supportive of this assertion as it revealed majorly outward dipping trend with depth along different axes. Another reason could be due to incomplete fluidization along the already formed ring fracture and poor assimilation of the country rock by the fluidizing agent amidst a slow/near quiescent piece meal stopping process during the central granite intrusion phase which usually marks the end of ring complex formation. Finally, this research has demonstrated the efficacy of aeromagneti...

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“…The lineament density map and the rose diagram of the study area are shown in Figure 7. There is consistency in the lineament hereby inferred and the previously inferred lineaments in the region [1,11,12].…”

Section: Lineament Study Of the Study Areasupporting

confidence: 85%

Structural Analysis of High Resolution Aeromagnetic Data. A Case Study of Akko and Environs, Gongola Basin upper Benue Trough Northeastern Nigeria: Implication for Mineralization and Groundwater Potentials

Bello

Musa

Kuforiji

et al. 2022

JGEESI

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Magnetic method had proved very effective in the area of subsurface anomaly studies and structural delineation worldwide. Sheet number 151(Akko sheet) of the high resolution digital airborne magnetic data was obtained from the Nigerian Geological Survey Agency (NGSA). Analysis of the data was done using first horizontal and first vertical filters while the residual field was obtained using the polynomial fitting method. Lineaments of the study area were generated from SRTM (shuttle radar thematic mapper) and DEM (digital elevation model) by producing four shaded relief images at solar altitude of 45˚, 50˚, 60˚ and 90˚. The first horizontal and first vertical derivative filters exhibited magnetic trend consistent with the lineament trend of the study area, which showed major trends in NE-SW and NNW-SSE direction and minor trends along NW-SE.

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An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

Cited by 11 publications

References 20 publications

Analysis and interpretation of high resolution aeromagnetic data over Kabo town and its adjoining areas, in Northwestern Nigeria

Analysis and interpretation of high resolution aeromagnetic data over Kabo town and its adjoining areas, in Northwestern Nigeria

Improved Mapping of the Structural Disposition of Some Younger Granite Ring Complexes of Nigeria Using High Resolution Aeromagnetic Data

Structural Analysis of High Resolution Aeromagnetic Data. A Case Study of Akko and Environs, Gongola Basin upper Benue Trough Northeastern Nigeria: Implication for Mineralization and Groundwater Potentials

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