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1 Acta Geophysica

1 2023

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Structural features derived from a multi-method approach and 2.75D modelling of aeromagnetic data: a case study of the Pitoa–Figuil area (Northern Cameroon)

Kassia G. Voltaire Souga, Mbarga T. Ndougsa, Meying A., Ngoh J. Daniel, Embeng S. Ngoa

Acta Geophysica

2023

Vol. 71, no. 2

587--600

An interpretation of aeromagnetic data was conducted in the Pitoa–Figuil area (Northern Cameroon). The aim of this investigation was the first to emphasise lineaments hidden under geological formations and secondly to propose two 2.75D models of the subsurface structures. Different magnetic data processing techniques were used, notably horizontal gradient magnitude, analytic signal and Euler deconvolution. The application of these techniques made it possible to map a certain number of lineaments representing discontinuities of magnetic susceptibility, mainly oriented NE–SW, NW–SE, E–W and ENE–WSW. The predominant direction for major lineaments is NE–SW and NW–SE. The major NE–SW trends have been attributed to the consequences of the Benue trough set-up due to the Atlantic opening. The lineaments map associated with the Euler solutions permits us to highlight and characterise 18 faults and some intrusive bodies. Euler solutions indicate depths down to 5.3 km for anomaly sources. The 2.75D modelling from the aeromagnetic anomaly reduced to the equator permits to understand the stratification of the deep and near-surface structures, which are sources of the observed anomalies. The sediment thickness values (3.5–4 km) combined with the presence of numerous deep faults make this area a potential site for hydrocarbon accumulations.