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| Sedimentology, provenance, and paleoclimate of Jurassic—Cretaceous red beds: Example from the southern Front of the Central High Atlas and Northern Preafrican Trough, Morocco |
| Said Adardora,*, Hicham Nasrib, Hamid Haddoumib, Radouan El Bamikia, Rachid Chennoufb, Hanane Mirib,c |
aGeology and Sustainable Mining Institute (GSMI), University Mohammed VI Polytechnic (UM6P), Ben Guerir 43150, Morocco;
bApplied Geosciences Laboratory, Geology Department, Faculty of Science, Mohammed 1st University, Oujda, Morocco;
cArgiles, Géochimie et Environnement sédimentaires (AGEs), University of Liege, B—4000 Liège, Belgium |
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Abstract Five stratigraphic sections from the Aghbalou N’Kerdouss—Tadighoust area were analyzed using integrated petrographic, granulometric, calcimetric, and mineralogical approaches applied to both bulk samples and clay fractions. The findings reveal a transitional depositional environment shaped by a dynamic interplay of continental and restricted marine influences, particularly within the Ifezouane Formation (Member 2), which reflects low—amplitude sea—level oscillations under confined paleoenvironmental conditions. Whole—rock mineralogy is dominated by quartz, K—feldspar, plagioclase, hematite, calcite, dolomite, siderite, and gypsum. The associated clay mineral assemblages comprise illite, kaolinite, smectite, and chlorite, with compositional variability across sections. Illite crystallinity and illite chemistry index data indicate a dual provenance, with sediment sources originating from both the Anti—Atlas and Sahara regions to the south, as well as the Jurassic uplands to the north. These interpretations are supported by petrographic evidence and mineralogical signatures. Furthermore, the mineralogical data suggest that arid to semi—arid climatic conditions and/or tectonic activity played a significant role during deposition. This study demonstrates how the integration of clay mineral signatures with petrography, grain—size distribution, and calcimetric data offers a reliable basis for reconstructing provenance, unraveling paleoenvironmental conditions, and refining palaeogeographic reconstructions of peri—Tethyan basins, while also providing a comparative framework applicable to analogous red bed systems worldwide.
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Received: 19 December 2024
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Corresponding Authors:
*E—mail addresses: Said.adardor@um6p.ma, adardorsaid2@gmail.com (S. Adardor), h.nasri@ump.ac.ma (H. Nasri), haddoumihamid@yahoo.fr (H. Haddoumi), radouan.elbamiki@um6p.ma (R. El Bamiki), r.chennouf@ump.ac.ma (R. Chennouf), hanane.miri@ump.ac.ma (H. Miri).
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2026, Vol. 15 
