Geophysical data from Kalaa Khesba and Kalaat Senam grabens, Central Tunisian Atlas and their geodynamic implications
Résumé
The geophysical techniques are more and more effective compared to the classical methods through the scientific and technological progress. The Geophysical prospecting based on seismic and gravimetric methods has shown the lateral evolution of facies and evidenced the structure of the NW grabens. In addition, the data set was found to have a good understanding of the structural geology of the region. Our study area is part of the northwestern Tunisia, whose geological evolution is strongly marked by the behavior of the whole Alpine chain of north Africa and the western Mediterranean. The lithostratigraphic correlations established using outcrops, well log and seismic data, allowed to better understand the structural complexity and the role of the various tectonic accidents that contributed to the current configuration, highlighted by the presence of grabens. The NW-SE, NNW-SSE to NS and NE-SW to EW faults played a major role in the genesis of the folds and the opening of the NW-SE grabens. A NW-SE compression which resulted by prevailing unconformities widely identifiable on the lithostratigraphic column is evidenced within the L1 seismic line. These unconformities, representing reverse faults, were interpreted as an overlap on this L1 seismic line. Gravity data with a negative anomaly also corroborate the seismic interpretation, confirming the structure of Kalaa Khesba graben, composed of Mio-Plio-Quaternary series.
Domaines
Géophysique [physics.geo-ph]
Origine : Fichiers produits par l'(les) auteur(s)
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