Geodynamic Framework of Saline Systems in Eastern Tunisia: Saline Depressions Inherited from the Triassic Intrusions and/or the Messinian Salinity Crisis

Figure 1

(a) Recent and current tectonic and seismotectonic map ([41], modified; [7]): 1: principal faults with Plio-Quaternary rejuvenation or presenting seismic activity indices, 2: graben with Plio-Quaternary rejuvenation, 3: strike-slip fault, 4: overthrust, 5: Quaternary fold or Quaternary rejuvenation, 6: direction of the 𝑃 axis of seismic focal mechanism, 7: direction of the 𝑃 axis of composite focal mechanism, 8: direction of compression based on the surface deformations of recent seisms (microtectonic data), 9: direction of compression based on the historical tectonic deformations (microtectonic data), 10: direction of the maximum horizontal constraint (in situ measurements), and 11: direction of surface principal stresses with indication of their positive (σ1) and negative (σ3) values [7]. (b) Tectonic map of Mechertate-Chrita-Sidi El Hani system: sites of seismic and geologic sections and locations of the hydrogeological drills [6].