LAUSR

Abstract This work analyzed gravity data over the Anambra Basin, Southeastern, Nigeria, with the aim of inferring the boundaries of the basin from gravity models. Method of study involved data acquisition and reduction, generation of Bouguer gravity map and separation of regional and residual anomalies. Data processing was enhanced by the use Oasis Montaj software. The interpretation of the Bouguer gravity anomalies ranged from visual inspection of figures to more complex methods that involved modelling of the subsurface layers. Sediment thickness in the study area ranged approximately from 0.4 km to 6 km. The highest gravity values (≥ 30 mGal) are associated with igneous rocks; the intermediate gravity values (11–29 mGal) are associated with Cretaceous sedimentary rocks, while the lower gravity values (