The geodynamic evolution style of belt structures in Southern Tunisian Atlas: case study of Chemsi anticline

During the Late Permian and especially at the Early Mesozoic periods, the tectonic evolution of Southern Tunisian Atlas is marked by a Permo-Triassic rift phase that led to the dislocation of the stable continental platform, a Jurassic-Cretaceous passive margin stage, and the inversion of the main b...

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Bibliographic Details
Published in:Arabian journal of geosciences 2021-07, Vol.14 (14), Article 1331
Main Authors: Lazzez, Khaled, Bensalem, Mohamed Sadok, Lazzez, Marzouk, Boulares, Achraf, Ghanmi, Mohamed
Format: Article
Language:English
Subjects:
Anticlines
Basin geometry
Cretaceous
Deformation
Earth and Environmental Science
Earth science
Earth Sciences
Evolution
Jurassic
Mesozoic
Original Paper
Passive margins
Permian
Platforms (geology)
Slip
Structural models
Tectonics
Tertiary
Triassic
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Summary:During the Late Permian and especially at the Early Mesozoic periods, the tectonic evolution of Southern Tunisian Atlas is marked by a Permo-Triassic rift phase that led to the dislocation of the stable continental platform, a Jurassic-Cretaceous passive margin stage, and the inversion of the main basins of the platform during the Tertiary Atlassic orogenesis. Our study area around the Chemsi anticline is located in the Southern Tunisian Atlas. The Chemsi anticline shows a distinguished axis fold’s variation across the Gafsa fault. The aim of our study is to explain the virgation of the Chemsi anticline in the east part of the Gafsa fault. The surface and subsurface data were used to illustrate the structural evolution of Chemsi anticline during tectonics events. The extensional deformation is illustrated by a normal Gafsa fault since Triassic to Lower Cretaceous. The basin geometry and structural evolution were differentiated by Triassic deposits across the Southern Tunisian Atlas. The reverse dip associated with the strike-slip system identified in the field study indicates a compressive phase starting in Upper Cretaceous. During the Atlassic compressive phases, the reactivation of the preexisting Gafsa normal fault enhances the geodynamic evolution of the Chemsi anticline. This structure shows a distinguished variation of fold geometry with axis virgation in the eastern part which linked to the strike-slip system of N-S axis and Gafsa reverse fault during Post-Villafranchian compressive phase. All the data results support us to create a conceptual structural model explaining the axis fold’s virgation of the Chemsi anticline.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-021-07695-y