Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin

Abstract This study defines a new boundary between the crystalline and sedimentary rocks of Eastern Dahomey Basin at the southwestern part of Nigeria using a geophysical approach that combines regional aeromagnetic and ground resistivity data. Aeromagnetic data covering the entire Eastern Dahomey Ba...

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Autores principales:	Ganiyu O. Mosuro, Niyi-Ola Adebisi, Stephen O. Ariyo, Kamaldeen O. Omosanya, Olateju O. Bayewu, Moroof O. Oloruntola
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0b619b98a8774ddb90468089793c6a37
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spelling	oai:doaj.org-article:0b619b98a8774ddb90468089793c6a372021-12-02T13:19:29ZRedefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin10.1038/s41598-021-84687-82045-2322https://doaj.org/article/0b619b98a8774ddb90468089793c6a372021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84687-8https://doaj.org/toc/2045-2322Abstract This study defines a new boundary between the crystalline and sedimentary rocks of Eastern Dahomey Basin at the southwestern part of Nigeria using a geophysical approach that combines regional aeromagnetic and ground resistivity data. Aeromagnetic data covering the entire Eastern Dahomey Basin were acquired at 500 m line spacing, 80 m mean terrain, and processed into grids of Residual Magnetic Intensity (RMI) map. Filters and corrections such as upward continuation, and reduction to equator were applied to enhance deep magnetic sources and correct for magnetic inclination and declination. Tilt Derivative Angles (TDR) was applied for edge detection. To support the aeromagnetic analysis and interpretation, 104 Vertical Electrical Sounding (VES) surveys and 8 Electrical Resistivity Tomography (ERT) data were also acquired, processed and interpreted along the basement-sedimentary rock boundary. The TDR revealed a significant trend that corresponds to the edge between the basement complex and the sediments of the Eastern Dahomey Basin. A strong match was also noticed between the VES positions and the TDR map. Areas interpreted as basement rocks from the VES stations align with positive values on the TDR maps while the sedimentary terrains have negative TDR values. Our work demonstrates that areas that were previously fixed as sedimentary terrains on geological maps belong to the crystalline basement or transition zone. A new and reliable geological boundary is hereby drawn between the basement and sedimentary rocks. Thus, providing a revised map of the Eastern Dahomey Basin.Ganiyu O. MosuroNiyi-Ola AdebisiStephen O. AriyoKamaldeen O. OmosanyaOlateju O. BayewuMoroof O. OloruntolaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ganiyu O. Mosuro Niyi-Ola Adebisi Stephen O. Ariyo Kamaldeen O. Omosanya Olateju O. Bayewu Moroof O. Oloruntola Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin
description	Abstract This study defines a new boundary between the crystalline and sedimentary rocks of Eastern Dahomey Basin at the southwestern part of Nigeria using a geophysical approach that combines regional aeromagnetic and ground resistivity data. Aeromagnetic data covering the entire Eastern Dahomey Basin were acquired at 500 m line spacing, 80 m mean terrain, and processed into grids of Residual Magnetic Intensity (RMI) map. Filters and corrections such as upward continuation, and reduction to equator were applied to enhance deep magnetic sources and correct for magnetic inclination and declination. Tilt Derivative Angles (TDR) was applied for edge detection. To support the aeromagnetic analysis and interpretation, 104 Vertical Electrical Sounding (VES) surveys and 8 Electrical Resistivity Tomography (ERT) data were also acquired, processed and interpreted along the basement-sedimentary rock boundary. The TDR revealed a significant trend that corresponds to the edge between the basement complex and the sediments of the Eastern Dahomey Basin. A strong match was also noticed between the VES positions and the TDR map. Areas interpreted as basement rocks from the VES stations align with positive values on the TDR maps while the sedimentary terrains have negative TDR values. Our work demonstrates that areas that were previously fixed as sedimentary terrains on geological maps belong to the crystalline basement or transition zone. A new and reliable geological boundary is hereby drawn between the basement and sedimentary rocks. Thus, providing a revised map of the Eastern Dahomey Basin.
format	article
author	Ganiyu O. Mosuro Niyi-Ola Adebisi Stephen O. Ariyo Kamaldeen O. Omosanya Olateju O. Bayewu Moroof O. Oloruntola
author_facet	Ganiyu O. Mosuro Niyi-Ola Adebisi Stephen O. Ariyo Kamaldeen O. Omosanya Olateju O. Bayewu Moroof O. Oloruntola
author_sort	Ganiyu O. Mosuro
title	Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin
title_short	Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin
title_full	Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin
title_fullStr	Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin
title_full_unstemmed	Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin
title_sort	redefining the boundary between crystalline and sedimentary rock of eastern dahomey basin
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0b619b98a8774ddb90468089793c6a37
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Redefining the boundary between crystalline and sedimentary rock of Eastern Dahomey Basin

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