Manifestations tectono-diapiriques synsédimentaires et polyphasées d'âge Crétacé supérieur–Quaternaire dans la région de Zag Et Tir (Tunisie centre-nord)

Gharbi, Ridha Abdessalem; Chihi, Lassaad; Hammami, Mongi; Soumaya, Abdelkader; Kadri, Ali

doi:10.1016/j.crte.2005.07.006

Cited by 12 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…6). This unconformity which is well imaged by seismic records as well as field outcrop observations confirms the important compression phase dated Middle-Upper Eocene [3,5,21,25,28,29,30,32] and generally called ''Atlas event'' in the Maghreb [5][6][7]16,17,21,[27][28][29].…”

Section: Discussionsupporting

confidence: 73%

“…On the other hand, different studies emphasised the occurrence of Triassic salt movements in northern Tunisia [2,3,11,14,17,26,28,31,32,[35][36][37][38][39][40]41] and beneath the ''nappe'' [37], especially beneath the Numidian flysch [2,14,38]. Nevertheless, the subsurface structural style remains questionable because of the scarcity of the seismic records, which remains a limiting factor to decipher the structural subsurface style at depth and to have a general overview of the area.…”

Section: Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

New insights on the structural style of the subsurface of the Tell units in north-western Tunisia issued from seismic imaging: Geodynamic implications

Khomsi

Soussi

Mahersi

et al. 2009

Comptes Rendus. Géoscience

View full text Add to dashboard Cite

Structural interpretations of seismic sections crossing the Tell area in Tunisia, allow us to outline the structural style of the subsurface along the thrust front of the Numidian ''nappe'' and its relationships with the substratum north of the Middle Mejerda valley. The seismic interpretations show a structural style characterized by large thrust sheets detached over the Triassic salt, whereas the autochthonous cover is affected by inherited faults and tilted blocks. These inherited faults are connected at depth on the major ''décollement'' level represented by the interface Triassic salt/Mesozoic-Cenozoic cover. This autochthonous Atlas type cover recorded the Eocene Atlas compressional event outlined by the angular unconformity of the Oligo-Miocene on top of folded Cretaceous strata. Seismic interpretation shows also the occurrence of important halokinetic movements deforming both the autochthonous and allochthonous series. Two types of diapirs can be distinguished: the first ones cutting the autochthonous sedimentary cover, the second ones the Tellian sheets specially the Numidian ''nappe'' which is the uppermost tectonic unit of the Tellian belt. These latter Triassic levels have pierced the allochthonous cover after the ''nappes'' emplacement i.e. after the Langhian and during the Late Miocene compressional events. Otherwise, Triassic salt is incorporated as sole thrust level beneath the Numidian ''nappe''. A regional structural transect crossing the whole Tunisia thrust belt from the Tell to the southeastern foreland and the Zaghoaun thrust-fault allows us to illustrate the overall structural style of the Domain. It outlines the occurrence, beneath the upper-most Tellian structural level (Numidian) of imbricated units issued from duplexing of the sedimentary cover. It appears that the Numidian ''nappe'' detaches over Middle-Late Eocene shales which represent the upper-most ''décollement'' level. The Triassic salts locally exposed at the base the Numidian ''nappe'' are incorporated mechanically during the southward gliding of the ''nappe'' above the duplex structures.

show abstract

Section: Discussionsupporting

confidence: 73%

Section: Geological Settingmentioning

confidence: 99%

New insights on the structural style of the subsurface of the Tell units in north-western Tunisia issued from seismic imaging: Geodynamic implications

Khomsi

Soussi

Mahersi

et al. 2009

Comptes Rendus. Géoscience

View full text Add to dashboard Cite

show abstract

“…During both extensional and compressional phases this Triassic salt has been remobilized throughout the pre-existing system of faults. Some of these salt structures are considered as diapirs (Gharbi et al 2005) in which salt occupies the core of the anticlines, and others as salt glaciers Ben Slama et al 2009) in which Triassic evaporites were interstratified within the Aptian clay series. These salt structures started to grow during the Aptian (Snoke et al 1988;Perthuisot et al 1998) or even earlier (Boukadi & Bedir 1996).…”

Section: Structural Evolutionmentioning

confidence: 99%

Tectonosedimentary evidence in the Tunisian Atlas, Bou Arada Trough: insights for the geodynamic evolution and Africa–Eurasia plate convergence

Chelbi

Kamel

Harrab

et al. 2013

JGS

View full text Add to dashboard Cite

The Bou Arada Trough is an east-west-oriented structure located 80 km SW of Tunis, characterizing the central Tunisian Atlas. This trough is filled by a thick Quaternary sand and clay series and is bordered by complex systems of folds generally trending NE-SW. Contacts between the Bou Arada Trough and the neighbouring folds are accommodated by NE-SW-and NW-SE-oriented faults. In contrast to the other troughs of the Tunisian Atlas, which are related to the Pliocene-Quaternary orogenic period, the geodynamic evolution of the Bou Arada Trough began in the Maastrichtian and has continued until the present day. Structural, tectonosedimentary and seismic data analyses are undertaken in the study area to better understand the evolutionary scenario of this trough. The results obtained show that the Bou Arada Trough is fragmented into three NW-SE-oriented sub-basins and records a continuous history of downthrow. Indeed, during extensional to transtensional regimes, this trough has evolved in response to the two networks of perpendicular fractures whereas during compressive to transpressive periods, the collapse of the Bou Arada Trough has been induced by a pull-apart mechanism using the same network of faults but with a strike-slip movement. The Bou Arada Trough thus preserves a record of the convergence between the European and African plates since the Maastrichtian.

show abstract

“…However, some authors [17,38,42,103,122,140,141] consider that this period constitute the continuation in time of the Mesozoic extension.…”

Section: Early Eocenementioning

confidence: 99%

Role of the NE-SW Hercynian Master Fault Systems and Associated Lineaments on the Structuring and Evolution of the Mesozoic and Cenozoic Basins of the Alpine Margin, Northern Tunisia

Melki¹,

Zouaghi²,

Chelbi³

et al. 2012

Tectonics - Recent Advances

View full text Add to dashboard Cite

Manifestations tectono-diapiriques synsédimentaires et polyphasées d'âge Crétacé supérieur–Quaternaire dans la région de Zag Et Tir (Tunisie centre-nord)

Cited by 12 publications

References 10 publications

New insights on the structural style of the subsurface of the Tell units in north-western Tunisia issued from seismic imaging: Geodynamic implications

New insights on the structural style of the subsurface of the Tell units in north-western Tunisia issued from seismic imaging: Geodynamic implications

Tectonosedimentary evidence in the Tunisian Atlas, Bou Arada Trough: insights for the geodynamic evolution and Africa–Eurasia plate convergence

Role of the NE-SW Hercynian Master Fault Systems and Associated Lineaments on the Structuring and Evolution of the Mesozoic and Cenozoic Basins of the Alpine Margin, Northern Tunisia

Contact Info

Product

Resources

About