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| Maghrebides | |
|---|---|
| Name | Maghrebides |
| Country | Morocco, Algeria, Tunisia, Spain |
| Region | Maghreb, Iberian Peninsula |
| Orogeny | Alpine orogeny |
| Geology | Mesozoic, Cenozoic, Paleozoic |
Maghrebides The Maghrebides are a complex mountain system of North Africa and adjacent Iberia characterized by accreted terranes, nappes and ophiolitic remnants resulting from Mesozoic–Cenozoic convergence between the African Plate and the Eurasian Plate. They form an arcuate belt that records interactions involving the Alpine orogeny, the opening of the North Atlantic Ocean, and the closure of the Tethys Ocean, and they have been studied in relation to regional tectonics involving the Atlas Mountains, the Betic Cordillera, and the Alboran Sea. Research on the Maghrebides integrates field mapping, geochronology, and geophysical surveys by institutions such as the Institut national de géologie and collaborations with groups involved in projects like the European Geosciences Union initiatives and the International Union of Geological Sciences.
The name derives from the medieval Latin and Arabic traditions that named North African landscapes linked to the Maghreb and was formalized in geological literature alongside terms used for the Betic-Rif orogenic system and the Alboran Domain. Early stratigraphic descriptions and tectonic syntheses by researchers affiliated with the CNR and the CNRS helped standardize the term in regional maps produced by agencies such as the United States Geological Survey and national geological surveys of Morocco, Algeria, and Spain.
The Maghrebides occupy the convergent margin between the African Plate and the Iberian microplate within the larger context of the Alpine orogeny and have been influenced by the rollback of the Tethys Ocean and the subduction processes that also shaped the Apennines and the Hellenides. Tectonic reconstruction uses data from paleomagnetism, seismic profiles from the Mediterranean Sea and GPS networks operated by agencies such as IGN and the Spanish National Geographic Institute, combined with thermochronology studies using techniques developed at laboratories like CEREGE and the GFZ German Research Centre for Geosciences. The belt contains remnants of the Rif and Tell Atlas domains and records plate interactions that include the Cretaceous, Paleogene, and Neogene episodes documented in basin analyses linked to the Alboran Basin and the Balearic Islands.
Stratigraphic sequences encompass Permian to Quaternary units with prominent Mesozoic carbonates, continental siliciclastics, and ophiolitic complexes correlated with the Iberian Massif, the Málaga–Alborán flysch, and the Numidian Flysch. Lithologies include limestone platforms comparable to those in the Apennine Mountains, pelagic marls akin to the Tortonian deposits of the Po Basin, and mafic-ultramafic suites associated with the Betic ophiolites and the Rif ophiolites. Stratigraphic frameworks developed by teams from the University of Granada, Université Hassan II, and the University of Algiers integrate biostratigraphy using taxa referenced in faunal lists curated by institutions like the Natural History Museum, London.
Metamorphic grades range from low-grade zeolite and prehnite-pumpellyite assemblages to amphibolite-facies conditions in deeply buried units comparable to metamorphic belts in the Sierra Nevada (Spain). High-pressure, low-temperature metamorphism in parts of the chain records subduction-related metamorphism akin to that in the Western Alps and has been constrained by radiometric dating methods implemented at facilities like the Argonne National Laboratory and the Max Planck Institute for Chemistry. Magmatism includes calc-alkaline suites and back-arc magmatism linked to the Alboran volcanic province and episodes of Miocene magmatism documented in geochemical studies from the Instituto Geológico y Minero de España.
The orogenic architecture comprises major thrust systems, recumbent folds and extensional detachments that form nappes comparable to those mapped in the Apuan Alps and the Dinarides. Structural analyses employ balanced cross-sections and kinematic models used by researchers from the University of Barcelona, the CNRS, and the Spain–Morocco Geological Working Group to interpret synorogenic sedimentary basins and gravity-driven emplacement of ophiolitic sheets similar to the Semail Ophiolite phenomenon. Active deformation is monitored via seismicity catalogs maintained by the International Seismological Centre and regional networks such as the Algerian Seismological Centre.
Paleogeographic reconstructions place the Maghrebides within scenarios of African–Eurasian convergence, Mediterranean basin evolution and episodic marine transgressions influenced by events like the Messinian salinity crisis and Atlantic–Mediterranean connectivity shifts tied to the Zanclean flood. Depositional histories show transitions from shallow carbonate platforms to deep-marine turbidites correlated with regional changes recorded in the Paratethys and the Western Mediterranean Basin. Chronostratigraphic frameworks rely on isotopic work comparable to studies on the Vöcklabruck Formation and microfossil records curated in collections at the Muséum national d'Histoire naturelle.
The Maghrebides host mineralization types including volcanogenic massive sulfides, hydrothermal polymetallic deposits and orogenic gold occurrences exploited in mines documented by the United Nations Economic Commission for Africa and national ministries like the Ministry of Energy Transition and Sustainable Development (Morocco). Hydrocarbon prospects are associated with synorogenic basins explored by companies such as TotalEnergies, BP, and national oil companies including Sonatrach and ONHYM. Aggregates, building stones and carbonate resources support regional industries linked to ports like Algeciras and Tanger-Med, while groundwater aquifers underpin agriculture in basins monitored by the Food and Agriculture Organization. Studies on resource sustainability involve collaborations with the World Bank and regional research centers including the African Union Commission.
Category:Geology of North Africa Category:Orogenies