New insights on the Ife-Ilesha schist belt using integrated satellite, aeromagnetic and radiometric data

Abstract

The present study combined analysis of satellite, aeromagnetic and radiometric data for evaluation of structural features within the Ife-Ilesha schist belt. Shuttle Radar Topographic Mission digital elevation data have been enhanced using hill-shading technique for the delineation of morphological features. The superposition of total gradient amplitude lineaments on the 3-D Euler deconvolution map revealed the trends and depth of structural features within the study region. The major trends are NE–SW, NNE–SSW, E–W and minor trends in the N–S direction, including the Ifewara shear zone that trends in the NNE–SSW. The estimated depths to the top of the sources within the shear zone varies from 90 to 200 m. Complementary analysis of the airborne radiometric data revealed that the Ifewara shear zone and adjacent regions are characterized by radiometric anomalies, indicating regional mineralization alteration zone. Generally, there is a good correlation between the satellite, radiometric, aeromagnetic maps which provides new insights and re-evaluation of structural features.

Structural investigation of Zungeru-Kalangai fault zone and its environ, Nigeria using aeromagnetic and remote sensing data

“…Also, an anomaly pattern cut through Malam Mudi and Kwaimbana (north central) with detectable positive-negative anomaly pairs representing folded north-south trending structures ( Beard, 2000 ). This N–S structural imprint might have been initiated during the Pan-African orogeny ( Olasehinde et al., 1990 ; Salawu et al., 2021 ).…”

“…Moreover, Wright et al (1985), Ananaba andAjakaiye (1987), Caxito et al (2020) revealed that the structural grain of the Precambrian rocks in most of West Africa generally lies between the N-S, NW-SE and NE-SW. The E-W structures appear to have been produced in earlier Orogeny events (pre-Pan-African Orogeny) (Salawu et al, 2021), consequent to the dominant Pan-African Orogeny. The lineaments delineated from the HRAD and satellite imageries were superimposed on the existing faults shown on the published geological map of Nigeria for possible correlation (Figure 8).…”

“…(2020) revealed that the structural grain of the Precambrian rocks in most of West Africa generally lies between the N–S, NW-SE and NE-SW. The E-W structures appear to have been produced in earlier Orogeny events (pre-Pan-African Orogeny) ( Salawu et al., 2021 ), consequent to the dominant Pan-African Orogeny.…”

“…Numerous literature on the investigation of structural lineaments has been presented by various authors (e.g. Agbebia and Egesi, 2020 ; Oladejo et al., 2020 ; Ajama et al., 2021 ; Osagie et al., 2021 ; Salawu et al., 2021 ). However, few studies were carried out on the Zungeru/Kalangai fault segment (e.g., Truswell and Cope, 1963 ; McCurry, 1976 ; Kolawole and Anifowose, 2011 ; Abubakar, 2012 ; Abdul Malik et al., 2018 ).…”

Aeromagnetic and digital elevation model constraints on the structural framework of southern margin of the Middle Niger Basin, Nigeria

“…Aeromagnetic survey and remote sensing methods are standard exploration techniques, which are highly suitable for mineral exploration programs 1,2 . Recent improvements in digital processing of remotely sensed imagery have led to higher resolution of delineation procedure of regional surface features.…”