An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

J Raimi,P Sule,B B M Dewu

doi:10.4236/ijg.2014.53031

Abstract

An interpretation of high resolution aeromagnetic data was carried out to provide new information about the study area. Located between latitude 10°30'N and 11°00'N and longitude 8°30'E and 9°00'E, the interpretation revealed previously unknown folds and magnetic anomaly with a signature that is similar to those associated with ring complexes in the study area but without the surface manifestation that is associated with the complexes. Qualitatively interpreted as unexposed ring complex, the magnetic anomaly is underlain by cross-over of major lineaments; implying presence of weak zone that probably allowed the volcanic eruption that initiated the emplacement of the source of the anomaly. A depth that ranges from outcrop to 1200 m and from outcrop to 1800 m is respectively suggested for the unexposed ring complex and folds by the Euler deconvolution results.

Highlights

Several geological and geochemical studies have been carried out in a study area that is bounded by latitude ̊30'N and ̊00'N and longitude 8 ̊30'E and 9 ̊00'E [1]-[5]
Noise was removed by upward continuation of the aeromagnetic anomaly field to a height of 125 m before producing the upward continued aeromagnetic anomaly map of the sheet, in coloured (Figure 4) and shaded relief (Figure 5)
Several processing techniques were applied to the upward continued aeromagnetic anomaly data but only the enhancement with optimal information for the intended purpose of this paper was considered for interpretation

Summary

Introduction

Several geological and geochemical studies have been carried out in a study area that is bounded by latitude ̊30'N and ̊00'N and longitude 8 ̊30'E and 9 ̊00'E [1]-[5]. Situated within the Nigerian younger granite province (Figures 1 and 2), the studies were mainly carried out because of the economic importance of some of the ring complexes in the area. The earliest gravity surveys were used to delineate and provide information about the ring complexes [6]-[10]. The studies have failed to provide information on structural setting. How to cite this paper: Raimi, J., Dewu, B.B.M. and Sule, P. (2014) An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province.

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Results

Conclusion