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Interpretation of remote sensing and aeromagnetic data to depict the structural framework of the transitional zone between the Igarra Schist belt and Anambra Basin, Nigeria

  • Research Article - Applied Geophysics
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Abstract

High-resolution aeromagnetic and Landsat-8 data were utilized for the structural investigation of the Igarra Schist Belt located where the Precambrian crystalline basement is unconformably overlain by the late-Cretaceous Anambra Basin fill. Analysis of the Landsat-8 data exhibits major lineaments that trend in E–W, ENE–WSW, NNW–SSE and N–S directions. Results from the analysis of total field anomaly data using total gradient amplitude and tilt angle of the horizontal gradient also show these same lineament trends. The superimposition of Landsat-8 and aeromagnetic data-derived lineaments resulted in the mapping of the regional lineaments, which provide clues to structurally controlled gold mineralization in the Igarra Schist Belt region. Details mapped from the remote sensing data show surface contacts that correspond to the boundary between the Igarra Schist Belt and Anambra Basin mapped from aeromagnetic data. The source parameter imaging of the aeromagnetic data provides depth estimates of the magnetic basement of the Igarra Schist Belt and Anambra Basin, which varies from 50 to above 650 m. The integration of the remote sensing and aeromagnetic lineaments with the 3-D Euler deconvolution results reveals that the locations of cluster solutions alignment with lineaments are target areas for gold mineralization, which is correlative to gold occurrences in the region.

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Data availability

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

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Acknowledgements

The author is very grateful to the management of BS Geophysical and Consultancy Ltd., for their 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

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Edited by Prof. Teresa Grabowska (ASSOCIATE EDITOR) / Prof. Gabriela Fernández Viejo (CO-EDITOR-IN-CHIEF).

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Salawu, N.B. Interpretation of remote sensing and aeromagnetic data to depict the structural framework of the transitional zone between the Igarra Schist belt and Anambra Basin, Nigeria. Acta Geophys. 71, 227–246 (2023). https://doi.org/10.1007/s11600-022-00915-3

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