Overview of the Structural Pattern in Northern Tunisia Inferred Gravity Interpretation

me zone in the Atlassic region. The gravity analysis consists in mapping the contrasting gravity responses: complete Bouguer anomaly, residual anomaly and derivative maps and Euler Deconvolution. The main results display a positive amplitude gravity anomaly as the response of Triassic evaporite bodies and important NE–SW-trending features at the boundaries between the Triassic outcrops and their enveloping strata. In contrast with gravity calculations of a salt dome structure usually resulting in negative gravity anomaly models, they express a positive gravity anomaly generated by a higher density of the Triassic mass contrasting with a lighter Meso-Cenozoic rock envelope. Gravity lineaments allow distinction of alignments extending NE-SW, which retrace master fault systems bordering the Triassic masses; the contact between Triassic and Cretaceous systems (or more recent), correspond to a part of steep gravity gradient. These faults are thought to have given issue to ascending evaporite-bearing masses.