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| North African Plate | |
|---|---|
| Name | North African Plate |
| Type | Microplate |
| Area km2 | 2000000 |
| Move direction | NE |
| Move speed mm per year | 5–20 |
| Boundaries | Eurasian Plate; African Plate; Arabian Plate; Aegean Plate; Anatolian Plate; Iberian Plate; Somali Plate |
| Notable features | Atlas Mountains; Tell Atlas; Sahara Desert; Tunisian Atlas; Alboran Sea |
North African Plate The North African Plate is a crustal block in the western Mediterranean and northern Saharan region that interacts with the Eurasian Plate, African Plate, Iberian Plate, Anatolian Plate, and Arabian Plate, producing complex orogenic, seismic, and sedimentary systems such as the Atlas Mountains, Alboran Sea basins, and the Sahara Desert. Its motions and collisions have shaped regional geology recognized in studies by institutions like the United States Geological Survey, Institut de Physique du Globe de Paris, and the British Geological Survey, and have influenced human history across places like Algeria, Morocco, Tunisia, and Libya. The plate forms a key component of Mediterranean tectonics linked to events such as the closure of the Tethys Ocean and the evolution of the Betic Cordillera and Apennine Mountains.
The plate spans northern Africa from the Atlantic margin adjacent to Iberian Peninsula and Strait of Gibraltar eastward beneath the Alboran Sea and the Tell Atlas into Tunisia and Libya, abutting the continental margin offshore of Sicily and Malta. It includes crust underlying parts of Morocco, Algeria, Tunisia, Libya, and smaller portions of Mauritania and Western Sahara, and interfaces with continental shelves near Balearic Islands and the Tyrrhenian Sea. Modern plate reconstructions use paleomagnetic data from sites studied by teams at University of Oxford, CNRS, and ETH Zurich, and integrate seismic tomography from projects like European Seismic Network.
The northern margin is bounded by convergent and transpressional contacts with the Eurasian Plate producing accretionary complexes like the Betic-Rif arc and the Apennine-Maghrebian orogeny, while the western limit at the Strait of Gibraltar involves strike-slip and extensional interactions influenced by the Azores-Gibraltar fracture zone. To the east the plate meets the Anatolian Plate and Arabian Plate along diffuse zones shaped during Neogene closure of the Tethys Ocean and later Messinian Salinity Crisis events. Subduction remnants and slab windows beneath the Tyrrhenian Sea and Alboran Sea are recorded in seismic profiles from IRIS networks and marine campaigns by Ifremer.
Crustal composition includes Precambrian and Paleozoic basement exposed in the Anti-Atlas and Tuareg Shield, Mesozoic carbonate platforms across the Saharan Platform and Cenozoic molasse sequences in the Tell Atlas and Rif. Mafic to ultramafic ophiolitic assemblages from closure of oceanic basins crop out in the Betic Cordillera and the Tethyan ophiolites of Oman analogues studied comparatively. Crustal thickness varies from thin continental margins offshore near Gibraltar to thickened orogenic roots beneath the High Atlas measured by seismic refraction experiments conducted by GFZ Potsdam and INGV.
The plate records a history from Neoproterozoic basement assembly during the Pan-African orogeny through Paleozoic sedimentation linked to the Variscan orogeny, Mesozoic rifting associated with the breakup of Pangaea and opening of the Central Atlantic, to Cenozoic deformation driven by Africa–Eurasia convergence and rollback of Ionian and Ligurian slabs. Key episodes include the Alpine orogeny, emplacement of Alpine nappes during the Oligocene–Miocene, and the Messinian Salinity Crisis that altered Mediterranean basin connectivity, all constrained by stratigraphic studies from agencies like Geological Survey of Algeria and radiometric dating from Max Planck Institute for Chemistry.
Seismic hazard stems from active thrusts and strike-slip faults in the Tell Atlas and western Mediterranean, exemplified by historical earthquakes affecting Algiers, Oran, Fez, and Tunis. Instrumental catalogs from EMSC and USGS document events linked to fault systems such as the Dorsale Tellienne and offshore faulting near Calabria and the Balearic Promontory. Active deformation produces crustal uplift, subsidence, and seismic swarms recorded by GPS networks operated by UNAVCO, IGN Spain, and national observatories.
The plate hosts major hydrocarbon provinces in the Nile Delta, Ghadames Basin, Illizi Basin, and Saharan Platform with reservoirs in Jurassic–Cretaceous carbonates and Triassic–Jurassic clastics exploited by companies like Sonatrach, Eni, and TotalEnergies. Significant mineral deposits include iron in the Hodna Basin, phosphate in Gafsa, manganese in Taznaït, and extensive salt and evaporite deposits tied to the Messinian Salinity Crisis mined in locales such as Béni Abbès. Groundwater in the North Western Sahara Aquifer System and Nubian Sandstone Aquifer supports agriculture managed under policies by Food and Agriculture Organization and regional ministries.
Surface expression includes high relief in the Atlas Mountains with glacial relicts on peaks like Toubkal, broad intracratonic basins of the Sahara Desert shaped by aeolian processes recorded near Ténéré, and coastal terraces along the Mediterranean Sea influenced by Holocene sea-level changes tied to events like the Younger Dryas. Fluvial systems such as the Chelif River, Medjerda River, and ephemeral wadis incise Quaternary deposits, while desertification and land use change are studied by agencies like UNEP and ICARDA using satellite data from Copernicus Programme.