Condition of development of collapse structure in the southernacentral Atlassic Tunisia case study to Gafsa Basin

The Bou Omrane is an example of southernacentral Atlassic Tunisian folds, this massive is presented by an anticline delimited by a NEaSW thrust. The geometry study of this anticline (hinge and subvertical layers) associated to structural and stratigraphic correlation confirms the development of structures according to afault propagation folda model. Using numerical software Rampe 1.3.0, the balanced cross-sections demonstrate the complicated growth of Bou Omrane anticline. The resulted structure is obtained by thrusting on breakthrough coupled to blockage of ramp on the back limb. All these condition confirm the role of diversity of tectonics events and the inheritance tectonics notion associated with the reactivation of pre-existing faults on the genesis of folds and the development of collapse structures according to more than one decollement level.