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Structural geometry of Ikogosi warm spring, southwestern Nigeria: evidence from aeromagnetic and remote sensing interpretation

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Abstract

In an attempt to understand the general structural patterns of Ikogosi warm spring and environs, remotely sensed images have been integrated with high resolution aeromagnetic anomaly dataset. This is because subsurface faults offer pathways for the upward flow of geothermal fluids and imaging these structures where they are concealed provides localized areas for geothermal investigation. Interpretation of the high resolution aeromagnetic, Landsat-8 and Shuttle Radar Topography Mission data has resulted in the detection of structural features within Ikogosi and environs. The enhancement of aeromagnetic anomaly data using total gradient technique facilitated the identification of three distinct geologic trends. This technique offers good information of structural patterns within the region, including the estimated source depths from the source parameter imaging and 3-D Euler deconvolution methods, which ranges from 100 to 860 m. The results show the distribution and direction of lineaments with major N–S, NE–SW and E–W trends within the study area. The combination of the surface lineaments with magnetic depth maps has established that faults around the warm spring interact, connect and act as conduits for the flow of hydrothermal fluids at varying depths which subsequently channel the fluids to an exit fault/lineament on the surface. The result revealed that the Ikogosi warm spring is situated along a major NNE-trending fault with subsidiary minor E-trending faults. These minor concealed subsidiary faults associated with the Ikogosi warm spring provides a follow-up for geothermal investigation within the region.

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Data availability

The Landsat-8 OLI/TIRS and Shuttle Radar Topography Mission data used for this study is publicly accessible and can be downloaded from the US Geological Survey (USGS) website. However, the high resolution aeromagnetic data is not publicly available but can be acquired from the Nigeria Geological Survey Agency.

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Acknowledgements

The authors are very grateful to the management of BS Geophysical and Consultancy Ltd., for their financial support and the facilities made available during this research.

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Authors and Affiliations

  1. BS Geophysical and Consultancy Ltd., Ilorin, Nigeria

    Naheem Banji Salawu

  2. Department of Geophysics, Federal University Oye-Ekiti, Oye-Ekiti, Nigeria

    Naheem Banji Salawu, Julius Ogunmola Fatoba, Leke Sunday Adebiyi & Akinola Bolaji Eluwole

  3. Department of Physical Sciences, Landmark University, Omu-Aran, Nigeria

    Leke Sunday Adebiyi

  4. Department of Physics and Material Science, Kwara State University, Malete, Nigeria

    Nurudeen Kolawole Olasunkanmi

  5. Department of Physics, University of Ilorin, Ilorin, Nigeria

    Muyiwa Michael Orosun

  6. Department of Geology and Mineral Sciences, Al-Hikmah University, Ilorin, Nigeria

    Silas Sunday Dada

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  1. Naheem Banji Salawu
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  2. Julius Ogunmola Fatoba
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  3. Leke Sunday Adebiyi
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  4. Akinola Bolaji Eluwole
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  6. Muyiwa Michael Orosun
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  7. Silas Sunday Dada
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Correspondence to Naheem Banji Salawu.

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Salawu, N.B., Fatoba, J.O., Adebiyi, L.S. et al. Structural geometry of Ikogosi warm spring, southwestern Nigeria: evidence from aeromagnetic and remote sensing interpretation. Geomech. Geophys. Geo-energ. Geo-resour. 7, 26 (2021). https://doi.org/10.1007/s40948-021-00224-x

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