Geophysical investigation of the possible extension of Ifewara fault zone beyond Ilesa area, southwestern Nigeria

Awoyemi, Musa Olufemi; Hammed, O.S.; Falade, Sesan Cornelius; Arogundade, Augustine Babatunde; Ajama, Ojudoo Darius; Iwalehin, Peter Olatunde; Olurin, O. T.

doi:10.1007/s12517-016-2813-z

Cited by 21 publications

(17 citation statements)

References 24 publications

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“…This rock is massively distributed, which can contribute to the state economy if properly mined. Further readings about the Basement Complex of SW Nigeria have been discussed by [30,41] and [45].…”

Section: Geology and Brief Tectonic Activity Of The Study Areamentioning

confidence: 99%

“…The HRAD is a highly efficient geophysical tool that delineates geostructural features such as shears, faults, and dyke [30]. Among the researchers who have demonstrated the effectiveness of HRAD in delineation and mapping of faults in Nigerian shore include Oladejo et al [27], Awoyemi et al [30,31], and Awoyemi et al [32]. The outcome of this study will enable the masses to know the routes/channels of these seismic energies whenever it is released.…”

Section: Introductionmentioning

confidence: 96%

“…This has necessitated this study to map the crustal fault architecture along Lagos-Ore axis, SW Nigeria using the high-resolution aeromagnetic data (HRAD). The HRAD is a highly efficient geophysical tool that delineates geostructural features such as shears, faults, and dyke [30]. Among the researchers who have demonstrated the effectiveness of HRAD in delineation and mapping of faults in Nigerian shore include Oladejo et al [27], Awoyemi et al [30,31], and Awoyemi et al [32].…”

Section: Introductionmentioning

confidence: 99%

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Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Oladejo¹,

Adagunodo

Sunmonu

et al. 2020

Open Geosciences

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A seismic wave is released when there is sudden displacement on a fault plane. The passage of this wave along the fault plane or within the lithosphere could result in ground shaking or vibration at the surface of the Earth. To provide a geophysical explanation to this phenomenon, the high-resolution aeromagnetic data of the sedimentary terrain and part of the Basement Complex of Southwestern Nigeria were processed and interpreted to provide fault architecture of the area, which could serve as conduit for the passage of seismic energy in the study area. High-resolution aeromagnetic data along the Lagos–Ore axis are processed for fault mapping in the study area. The reduced-to-equator (RTE) residual aeromagnetic data used were enhanced using the total horizontal derivative (THD) and upward continuation (UC) filtering techniques on Oasis Montaj 6.4.2 (HJ) software. The resultant maps were overlaid and compared with the plotted RTE residual maps for relevant interpretations. Varying signatures of magnetic anomalies are grouped into high (57.9–89.1 nT), intermediate (38.2–57.9 nT), and low (4.0–38.2 nT) magnetic intensities, which are associated with contracting basement rocks features. The obtained lineaments from the THD reveal areas of various deformations such as brittle, which is associated with faults/fractures, and ductile deformation, which is associated with folds of geological features. The faults, as depict by the UC map, reveal different depth ranges of 500–2250 m at the western side and 1,500–1,250 m at the northwestern area of the study. Since it has been on record that September 11, 2009, earth tremor of magnitude 4.4, with the epicenter at Allada, Bennin Republic, 128 km west of Lagos, Nigeria occurred within the study area, it can be inferred that the established geologic fault architecture could be responsible for the hazard and be part or synthetic to the Ifewara-Zungeru fault in Nigeria.

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Section: Geology and Brief Tectonic Activity Of The Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Oladejo¹,

Adagunodo

Sunmonu

et al. 2020

Open Geosciences

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“…6). On the THD map, peak anomalies are often observed over geologic contact zones such as fracture, shear zones and faults [22,77]. The amplitudes of the total horizontal gradient range between 0.0038 and 0.1289 nT/m.…”

Section: Total Horizontal Derivative (Thd) Mapmentioning

confidence: 99%

Structural and hydrothermal alteration mapping related to orogenic gold mineralization in part of Kushaka schist belt, North-central Nigeria, using airborne magnetic and gamma-ray spectrometry data

Sanusi

Amigun

2020

SN Appl. Sci.

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This paper presents an interpretation of airborne magnetic and gamma-ray spectrometry data over a part of the Kushaka schist belt of Nigeria with a view to assess the sub-surface structural framework and hydrothermal alteration haloes that are related to orogenic gold mineralization in the study area. The geophysical analyses performed to improve the quality of the aeromagnetic data for better understanding of the subsurface geology were reduction to the equator, upward continuation, total horizontal derivative, analytical signal, source edge detection, tilt-angle derivative of total horizontal derivative. The analyses performed on the airborne gamma-ray spectrometry data were made on K/eTh, F parameter and deviation of ideal K values (Kd). Deep-seated, brittle-ductile shear/fracture zones with characteristic depth of 428.0-607.6 m and area extent of 15.5 km by 6.5 km that were delineated in the area coincide with beehive of artisanal miners exploiting gold deposits. In this study, subsurface geologic structures, specifically dykes/faults, that trend in the ENE-WSW direction constitute a first-order control on orogenic gold mineralization in the study area. The hydrothermally altered zones mapped in the area indicated they are structurally controlled and closely associated with orogenic gold mineralization. Apart from geologic structural evidences that are controlling orogenic gold mineralization, this study has indicated that hydrothermal alteration mapping is equally important for a promising orogenic gold mineralization mapping.

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“…), engineering and environmental investigation, geothermal and hydrocarbon signatures (Reeves 2005). Several studies have shown that aeromagnetic data can be interpreted using derivatives (such as horizontal, vertical, and total), CET, Euler deconvolution, 2D Fourier transform (Balogun 2019;Reid et al 1990;Ozebo et al 2015;Lawal et al 2016;Lawal and Nwankwo 2017;Awoyemi et al 2017;Elkhateeb and Abdellatif 2018). All these mathematical techniques reveal trends in the subsurface geological lithologies and estimate depths to magnetic sources evolved from the susceptibility difference of the underlying rocks.…”

Section: Introductionmentioning

confidence: 99%

Use of Magnetic anomaly data to delineate subsurface structures and depth characterization of Lafiagi and its environs, Northcentral Nigeria

Lawal

Sunday

Fawale

et al. 2021

NRIAG Journal of Astronomy and Geophysics

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As part of the effort to have updated knowledge about the metallic source location, subsurface structures and depth information responsible for mineralization in Lafiaji and its environs, North-central Nigeria, a magnetic data of the area has been analyzed using combinations of mathematical techniques. These techniques include Total Horizontal Derivatives (THD), Tilt Derivatives (TD), CET grid technique, Euler Deconvolution (ED), and Fourier technique. Reduction to equator (RTE) was performed on the magnetic data and subjected to the mathematical techniques. The TD, THD and CET techniques revealed various striking subsurface structures moving in NE, SW, NW SE, EW direction and forms banded gneisses and muscovite schist that are intimately linked through the crustal progress going on in the basement rock of the area. The ED solutions did not only reveal various structural sources but also determines the best index with the average depth values of various metallic sources. Also, the result from the spectral analysis ranges from 1.40 km -3.50 km. In conclusion, this study did not only demonstrate the usefulness of HRAM data in revealing the nature and extent of subsurface structural features and depth information but also shows intense tectonic deformation of the basement structures responsible for mineral exploration.

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Geophysical investigation of the possible extension of Ifewara fault zone beyond Ilesa area, southwestern Nigeria

Cited by 21 publications

References 24 publications

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

Structural and hydrothermal alteration mapping related to orogenic gold mineralization in part of Kushaka schist belt, North-central Nigeria, using airborne magnetic and gamma-ray spectrometry data

Use of Magnetic anomaly data to delineate subsurface structures and depth characterization of Lafiagi and its environs, Northcentral Nigeria

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