Structural and geodynamic study in central Tunisia using field and geophysical data: new structural interpretation of the N–S axis and associated Atlassic structures

摘要: A structural and geodynamic evolution of central Tunisia is constructed from field studies geophysical data within the Tunisian Atlassic domain. Bouguer gravity horizontal gradient magnitude (HGM) maps indicate that computed anomalies are related to subsurface structures in accordance with general trends Tunisia. Near Cherichira fault, strike ENE–WSW, whereas it N–S along axis, a major discontinuity between Pelagian shelf east Central Atlas Mountains west. E–W-oriented HGM profiles on north side fault show moderate variations, which correspond NE–SW system Ousselet–Bou Dabbous. This trend also expressed by second-order vertical derivative map this area. However, south dominant peak indicated rather than characteristic fault. anomaly associated axis discontinuity. Seismic reflection used elucidate configuration style The seismic lines demonstrate faulting associate halokinesis Dabbous area not comparable paleogeographic southward. To massive Triassic evaporates piercing faults thickness variations Mesozoic Cenozoic stratigraphic units reverse slip western elements. It seems corresponds steeply dipping zone weakness indicates evidence several stages activity, including rise up outcrop at localities such as Rheouis Mezzouna. loading upward evaporites weak key factor thinning Mesozoic–Cenozoic sedimentary cover These new northeast extrapolation fold grabens Kairouan, northern extent limited oriented parallels Ballouta–Zaghouan system, reflects regional Tellian orogeny nappes north. geometry kinematics these features linked tectonic African margin, extension separating European plates inversion since Late Cretaceous. correlated its direction framework strike-slip craton, present Algerian Saharan domain Hoggar.