Abstract
This paper presents the analysis and interpretation of an aeromagnetic data of Ilesha area, (Sheet 243) sourced from Nigeria Geological Survey Agency. The area is located between 7.5oN and 8.0oN of latitude and longitude 4.5oE to 5.0oE. Two methods: Analytic Signal Method (ASM) and Local wavenumber (LWN) were used. These methods were used to process and analyse the data so as to generate the depth to magnetic sources as well as the source locations. The results obtained showed a shallower depth range limit for ASM between 0.348 km and 1.28 km, which is less than the result of LWN within the range of 0.478 km-1.51 km. The results also revealed more source locations in ASM result in comparison with LWN. The overall results of the methods have revealed the prospect of the lithology of the area for magnetic mineral exploration in the field of applied geophysics.Keywords: Aeromagnetic survey, Analytic signal, Magnetic Anomaly, Local wave number, lithology
Highlights
The aeromagnetic map used in this study extended between 7.5oNand 8.0oN of latitude and from longitude 4.5oE to 5.0oE in Osun State Nigeria
The aeromagnetic data of Ilesha area was obtained as part of a nationwide aeromagnetic survey sponsored by the Nigeria Geological Survey Agency
Region 2 is juxtaposed by the high variation in anomaly signature of the contour lines. This region is characterized by shallower magnetic source because of the concentration of different magnetic intensity values while region 3 is characterized by low positive and negative magnetic anomaly and by deeper sources due to low concentration of magnetic intensity values
Summary
The processing of these data from the study area can provide important evidence of regional scale basement faulting in Ilesha, South-western Nigeria. The objective of this research work is to determine the depth to magnetic basement and its contact location in the study area. Andrew et al, (1994), Ozebo and Nwodo, (2017) carried out a study to interpret aeromagnetic data over Nsukka and Udi areas of Enugu state.
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