Book chapters

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Stratigraphy and Structural Style of the Maghrebides Belt Foreland: Souk Ahras Sellaoua Unit Case (External Domain, NE Algeria)
(2022) Abdallah CHABBI; Asma Chermiti; Stéphane Brusset
The Sellaoua Unit is part of the foreland of the Maghrebides belt in northeastern Algeria and develops in the footwall of Tellian and Numidian thrust sheets. Detailed geological mapping of Souk Ahras Sellaoua Unit (North–East of Algeria) supported by micro-paleontological and structural data allows us to reappraise the stratigraphy and the structural style of such area and characterize its relationship with the northern adjacent thrust sheets. Data were collected from sampling and observations along with four profiles for biostratigraphic study and five for structural constructions. The obtained results show that the Sellaoua Unit of the Souk Ahras area is made of carbonate marine formations ranging from Turonian to Paleocene uncomfortably overlain by detrital Miocene strata. Complex thrust systems have occurred during the Tertiary until the middle Miocene.
The External Domain of Maghrebides Belt on the North–East of Algeria, Souk Ahras Segment: Definition of Structural Units, Block Structure and Timing of Thrusts Setting
(2019) Abdallah CHABBI; Asma Chermiti; Abdelmadjid Chouabbi; Mohamed Benyoussef
The detailed geological mapping supported by micropaleontological, tectonic and structural data of Souk Ahras region (North–East of Algeria) made it possible to define the main structural units of the external domain of the Maghrebides belt in the North–East of Algeria. The study area shows a block structure illustrating an allochthonous domain (Numidian unit, the northern Tellian unit and the southern Tellian) thrusting a folded para-autochthonous domain (the scaly unit of the Sellaoua type and the Dj. Graout unit). The current structure is edified into three phases at least: post Langhian phase, Tortonian phase and Pliocene phase.
The Tellian Units, the Sellaoua Window and the High Medjerda Foreland in the Souk Ahras Area, NE Algeria
(2023) Abdallah CHABBI; Chermiti Asma; Brusset Stéphane; Chouabbi Abdelmadjid; Benyoussef Mohamed
In northeastern Algeria and south of Annaba city, the Souk Ahras region forms the southern Tellian external domain. It exhibits a complex structure characterized by the stacking of Tellian thrust sheets. These units are thrust above the Sellaoua and High Medjerda foreland and are overthrust by the Numidian thrust sheet. The overall structure is complicated by the presence of Triassic evaporitic bodies, which occur in various positions in the stratigraphic pile. Several tectonic phases have deformed this area in the Cenozoic. In this work, we have updated the stratigraphy and integrated it with geometric, structural, and tectonic surface data to characterize the structural style of the Tellian thrust sheets and their relationship with the surrounding units. The Paleocene to Eocene of the Tellian thrust sheets encompasses two main facies: deep marine globigerina facies to the north (Ouled Driss Sector), and shallow marine nummulitid facies to the south (Boukebch and Dekma areas), both have been unconformably covered by the Miocene. The Tellian thrust sheets of the Souk Ahras region exhibit a duplex geometry in the northern sector and an imbricate fan of thrusts to the south. These units are thrust over the Sellaoua and High Medjerda parautochthonous foreland with a basal decollement in the Paleocene series. The tectonics wedge involves also the Sellaoua and High Medjerda foreland strata, leading to a classic fold-and-thrust belt structure.