Integrating aeromagnetic and Landsat™ 8 data into subsurface structural mapping of Precambrian basement complex. (January 2017)

• Record Type: Journal Article
• Authors: Kayode, John Stephen; Nawawi, M.N.M.; Abdullah, Khiruddin B.; Khalil, Amin E.
• Is Part Of: Journal of African earth sciences. Volume 125(2017)
• Page Start: 202
• Page End: 213
• Publication Date: 2017-01
• Subjects: Aeromagnetic data -- Structural index -- Depth to magnetic sources -- South-western basement complex of Nigeria; Earth sciences -- Africa -- Periodicals; Earth sciences -- Middle East -- Periodicals; Geology -- Africa -- Periodicals; Geology -- Middle East -- Periodicals; Sciences de la terre -- Afrique -- Périodiques; Sciences de la terre -- Moyen-Orient -- Périodiques; Géologie -- Afrique -- Périodiques; Géologie -- Moyen-Orient -- Périodiques; Earth sciences; Geology; Africa; Middle East; Periodicals; Electronic journals; 556.05
• DOI: 10.1016/j.jafrearsci.2016.11.010
• Languages: English
• ISSNs: 1464-343X

Abstract

Abstract: The integration of Aeromagnetic data and remotely sensed imagery with the intents of mapping the subsurface geological structures in part of the South-western basement complex of Nigeria was developed using the PCI Geomatica Software. 2013. The data obtained from the Nigerian Geological Survey Agency; was corrected using Regional Residual Separation of the Total Magnetic field anomalies enhanced, and International Geomagnetic Reference Field removed. The principal objective of this study is, therefore, to introduce a rapid and efficient method of subsurface structural depth estimate and structural index evaluation through the incorporation of the Euler Deconvolution technique into PCI Geomatica 2013 to prospect for subsurface geological structures. The shape and depth of burial helped to define these structures from the regional aeromagnetic map. The method enabled various structural indices to be automatically delineated for an index of between 0.5 SI and 3.0 SI at a maximum depth of 1.1 km that clearly showed the best depths estimate for all the structural indices. The results delineate two major magnetic belts in the area; the first belt shows an elongated ridge-like structure trending mostly along the NorthNortheast-SouthSouthwest and the other anomalies trends primarily in the Northeast, Northwest, Northeast-Southwest parts of the study area that could be attributed to basement complex granitic intrusions from the tectonic history of the area. The majority of the second structures showed various linear structures different from the first structure. Basically, a significant offset was delineated at the core segment of the study area, suggesting a major subsurface geological feature that controls mineralisation in this area. Graphical abstract: Highlights: Application of PCI Geomatica 2013 software to process the data. Designed an Algorithm (euldph) to calculate the structural index of the subsurface magnetic anomaly structures. Prepared the maps for structural index of 0.5–3.0. Correlate the subsurface structural maps, i.e., the magnetic map; the Landsat™ 8; the Geology map and the DEM map.