Gravity analysis of the Precambrian basement topography associated with the northern boundary of Ghadames Basin (southern Tunisia)

The Southern Atlas Front in Tunisia and its foreland basin: Structural style and regional-scale deformation

“…This large Mesozoic half-graben is developed between two high structures i.e. the NCR to the North and the Telemzane arch or the Telemzane High in the South (Gabtni et al, 2006;Gabtni et al, 2011;Dhaoui et al, 2014). The uplift of the Telemzane Arch occurred probably during the Hercynian orogeny (Busson, 1967;Underdown and Redfern, 2007) attested in southern Tunisia and Libya by remarkable large-scale unconformity of the Mesozoic series on an E-trending preexistent Paleozoic arch (Boote et al, 1998).…”

“…15,16). The seismic section LS4a crossing the SCR preserved subsurface structures of the Chott Fejej and the northern side of the Telemzane arch or the Telemzane High (Gabtni et al, 2012;Gabtni et al, 2013;Dhaoui et al, 2014). The southwestern part of the seismic section shows a considerable thinning of the Mesozoic series above the faulted Paleozoic basement?…”

Contribution of gravity data and Sentinel-1 image for structural mapping. Case of Beni Mellal Atlas and Beni Moussa plain (Morocco).

“…The figure 11 summarizes all horizontal gradient maxima of the residual anomaly as such as its upward continuations at different altitudes represented by different colours. Linear contacts can correspond to faults while circular ones can represent diapers limits or intrusive bodies [60,82,83,84].…”

“…The two directions NW-SE and NE-SW guide in surface the majority of hydrographic network as well as the main springs distribution which emerge from the northern atlasic border of Tadla plain. Indeed, had demonstrated the influence of the brittle tectonic on the drainage network organization and the spring resurgence because it accelerates the erosion and alteration processes and therefore the rivers development For a better results analyzing and in order to rule on strucural origin [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86] of deduced lineaments from gravity data and radar images combination, we proceeded with a breakdown of the study area into tectonic sectors. Gravimetric lineaments and the ones deduced from the Sentinel-1image were correlated and compared for different parts of the study area ( Figu.13).…”

“…These directional peaks characterize the Atlas chain evolution during Mesozoic and Cenozoic periods [81][82][83][84][85][86][87][88][89][90][91][92][93].The direction NE-SW to ENE-WSW is parallel to the Atlas chain structural direction [39] and also to the Tadla basin lengthening. While the direction N-S; orthogonal and posterior to the previous one; corresponds to the alpine orogenesis phase .These fractures are responsible for the Beni Mellal carbonate reservoir karstification, they favor karsts evolution and underground caves and cavities formation by increasing the carbonates dissolution [94,95,96].…”