Journal Articles

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Author: search.filters.author.Abdallah CHABBI

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    Study of metasomatose iron deposit of Chaabet El Bellout (Ain Zana, NE of Algeria): mineralogy, geochemistry, and genetic model
    (Arabian Journal of Geosciences, Springer, 2022) Tarek Zerrouki; Abdelhak Boutaleb; Lounis Sami; Ahmed Abderrahmane Semchaoui; Abdallah CHABBI
    Chaabet El Bellout iron mine is located in the Medjerda Mountains, constituting a connection zone between the Maghrebides chain and the Saharan Atlas. This deposit is mainly embedded in Upper Cretaceous (Campanian and Maastrichtian) and Miocene limestones with clusters and veins replacing both carbonates and sandy-carbonate levels. In this study, feld observations and mineralogical analyses combined with geochemical and oxygen isotopic data were used to determine the origin of the mineralizing fuid and the source of mineralization. The results indicate that the iron ore of Chaabet El Bellout is of medium quality resulting following two main phases: frst, the replacement of Cretaceous carbonates by ankerite and siderite, followed by the alteration of iron oxides (hematite and magnetite), then, a deposit of high temperature sulfdes, sulfosalts, and sulfates (pyrrhotite, pyrite, chalcopyrite, gray copper, and barite) in a fractured zone. However, the contribution of magmatic fuids cannot be excluded, as some samples reveal high V-Mo-Ni and Zn contents and a negative isotopic signature (-0.6‰ VSMOW) diferent from the rest of samples that all indicate positive values (0.6 to 1.6‰ VSMOW), suggesting the participation of metasomatic saline fuids interacting with marine carbonate levels deposited in the Cretaceous and Triassic formations.
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    Stratigraphy and structural style of Souk Ahras foreland fold-thrust belt in northeastern Algeria
    (2021) Abdallah CHABBI; Asma CHARMITI; Stéphane BRUSSET
    In northeastern Algeria, the Souk Ahras foreland basin is a part of the Maghrebides fold-thrust belt and comprises Sellaoua and Medjerda High units in the footwall of Tellian thrust sheets. Detailed geological mapping supported by micro-paleontological, petrographic, and structural data allows us to reappraise its stratigraphy and its structural style and to characterize the relationship between the different structural units (Numidian, Tellian, Sellaoua, and Medjerda High units). Data were collected for a biostratigraphy and field observations along to six (06) sections spread over the Ouled Driss, Dj. Boubakhouch, Dj. Boukebch – Dekma, and the Medjerda High. The Souk Ahras foreland basin substrate is made up by Jurassic and early Cretaceous series and constituted an outer shelf pre-foreland passive margin where salt tectonics occurred. From upper Cretaceous to Miocene, flexural subsidence and thrust wedge propagation took place as the result of the northward drift of Africa plate. The Souk Ahras foreland is finally deformed by thrust-related folds, which affected a pre shortening tectonic pile involving remnant of salt tectonics influenced margin during at least Cretaceous times