Abstract
This study mapped deep crustal network of the Equatorial Atlantic Fracture Zones in southern Nigeria using regional scale magnetic and gravity data in an attempt to link the Equatorial Atlantic Fracture Zones to structures of similar trend in the continental margin of southern Nigeria. The data were analysed by removing the regional trend of the data and isolating deep-seated anomalies of interest. Thereafter, the theta potential gradient tensor method was applied to delineate the network of the Equatorial Atlantic Fracture Zones and their linkage to other associated deep-seated lineaments in southern Nigeria. Within the limit of the study area, the results obtained revealed the network of the Romanche, Chain and Charcot Fractures Zones, and their extent, several hundreds of kilometers within the landmass of southern Nigeria. The build-up and transformation of the mapped lineaments further supported evidence of extensional crustal deformation within the Niger Delta Basin and Benue Trough axis which may have influenced rifting in the early Cretaceous.
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