Preuves de la non-stratification du Trias dans le Turonien de la Koudiat Sidii (Nord-Ouest de la Tunisie)

Chikhaoui, M.; Braham, Ahmed; Turki, Mohamed Moncef

doi:10.1016/s1251-8050(01)01597-x

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“…The numerous Triassic salt outcrops in the Atlas of northern Tunisia (Fig. 1) have therefore occupied an important place in geological studies, primarily due to both structural aspects (Perthuisot 1978, 1981, 1994; Chikhaoui 1988, 2002; Snoke, Schamel and Karasek 1988; Perthuisot and Rouvier 1992; Perthuisot et al 1998; Rouvier et al 1998; Chikhaoui, Braham and Turki 2001) and exploration interests (Hatira 1988; Hammami 1999; Hatira et al 2000; Braham et al 2002; Jallouli et al 2005a; Benassi et al 2006; Hamdi‐Nasr et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Gravity analysis of salt structures. An example from the El Kef-Ouargha region (northern Tunisia)

Arfaoui

Inoubli

Tlig

et al. 2011

Geophysical Prospecting

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A B S T R A C TTriassic outcrops in the Atlassic zone of northern Tunisia may be modelled in two ways: salt bodies piercing through Cretaceous terrains or Triassic salt flows stratified within an Albian series. Both models find support from gravity data and are debatable. To evaluate the mass distribution changes with depth, the Bouguer anomaly of the El Kef-Ouargha region was successively decomposed into regional and residual components to construct multiple pseudo-depth slices and apparent density maps. Analyses of gravity lows clearly show a vertical continuity of less dense materials below the Triassic salt outcrops. These features can be explained by salt diapirism during Mesozoic and Cenozoic. Further, gravity data tend to indicate less dense materials below Aptian outcropping in Jebel Aite (Oued Bou Adila); thus suggesting Triassic materials occurring at depth. In addition, dense entities were recognized under MioPliocene and Quaternary deposits, which are thought to correspond to Cretaceous paleoshoals currently collapsed by non-outcropping faults. Our findings lend support to a diapir model intruding overburden rather than the salt glacier model stratified in the Albian series proposed by some authors as the genetic structural model for Triassic material-bearing series in the north of Tunisia.

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