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| Sierra de Betic-Rif orogeny | |
|---|---|
| Name | Sierra de Betic-Rif orogeny |
| Country | Spain; Morocco |
| Region | Andalusia; Almería (province); Granada (province); Málaga; Cadiz; Rif |
| Parent | Betic Cordillera; Rif Mountains |
| Orogeny | Alpine orogeny |
| Period | Cenozoic; Mesozoic |
Sierra de Betic-Rif orogeny is a complex orogenic system characterizing the interaction zone between the southwestern margin of Eurasia and the northwestern margin of Africa during the Cenozoic. The orogeny produced the Betic Cordillera in southern Spain and the Rif Mountains in northern Morocco, integrating processes recorded across the Alboran Sea, Gibraltar Arc, and adjacent basins. Its study links regional events from the Pyrenees to the Atlas Mountains and bears on paleogeographic reconstructions involving the Iberian Plate, the African Plate, and the Apennines.
The orogeny occupies a key position between the Iberian Peninsula, the Atlas Mountains, and the Mediterranean Sea, interfacing with the Alboran Domain and the Gibraltar Strait. The structural framework juxtaposes the Alpujarride Complex, Maláguide Complex, and Nevado-Filábride Complex against external Mesozoic and Cenozoic units including the Alboran Sea Basin and the Rif Accretionary Wedge. Regional evolution responds to motions of the Iberian Plate, African Plate, and microplates such as the Alboran microplate and the Corsica-Sardinia Block, with interactions tied to the Alpine orogeny and the opening and closure of the Tethys Ocean. Key geographic references include Gibraltar (city), Almería, Granada (province), Málaga, Ceuta, and Melilla.
Tectonic stages include Late Mesozoic extension, Paleogene contraction, and Neogene reorganization associated with the Neogene collision and rollback processes. Initial rifting that formed the Betic-Rif basins linked to westward retreat of the Tethyan realm and the westward drift of the Iberian Plate relative to the European Plate. Subsequent compression generated thrusting, folding, and continental subduction comparable to events recorded in the Apennines, Alps, and Pyrenees. Kinematics invoke slab rollback of the former Tethys slab, trench retreat, and the formation of oroclines such as the Gibraltar Arc, interacting with strike-slip systems like the Trans-Alboran Shear Zone and motions along the Azores–Gibraltar Fault Zone.
Stratigraphic columns preserve sequences from Triassic evaporites and Jurassic limestones to Cretaceous pelagic successions and Paleogene flysch, capped by Neogene molasse and marine sediments. Units such as the Maláguide Complex contain ophiolitic remnants and Mesozoic cover, whereas the Alpujarride Complex records high-pressure carbonates and metamorphic cover sequences. Structural style includes stacked nappes, large-scale thrust sheets comparable to those in the Helvetic nappes, extensional detachment faults analogous to the Aegean Sea systems, and tightly folded units around structural highs like Sierra Nevada and Penibaetic System features.
Metamorphic assemblages span low-pressure/high-temperature to high-pressure/low-temperature regimes, with eclogite- to blueschist-facies relics comparable to metamorphic complexes in the Alps and the Western Mediterranean. Contact and regional metamorphism relate to subduction, burial, and exhumation episodes synchronous with magmatism including calc-alkaline and peraluminous suites. Igneous activity comprises Miocene to Pliocene volcanic and plutonic episodes tied to extension and slab rollback, with affinities to magmatic centers such as those observed in the Iberian Massif and the Atlas region, and links to mantle processes beneath the Alboran Sea.
Sedimentary evolution features syn-orogenic basins, foreland-type deposits, and intra-orogenic basins like the Guadalquivir Basin and the Guadix-Baza Basin. Provenance signals reflect erosion of uplifted crystalline complexes and involvement of detritus from the Iberian Massif and Atlas uplift. Basin fill ranges from deep-marine turbidites and flysch to continental red beds and lacustrine deposits concurrent with tectonic pulses, comparable to sedimentary records in the Valais Basin and the Liguro-Provencal Basin.
Radiometric ages from rift-related volcanics, syn-orogenic intrusions, and metamorphic cooling constrain deformation from Late Cretaceous through Neogene with intense Paleogene–Miocene reworking. Isotope systems include U-Pb on zircon, Ar-Ar on white micas and amphiboles, and Rb-Sr whole-rock data, matching age ranges established in studies of the Apennines, Alps, and Calabrian Arc. Detrital zircon provenance studies tie sediment input to sources such as the Central Iberian Massif and the Anti-Atlas.
Geodynamic models invoke rollback of a remnant Tethys slab, opening of the Alboran Sea as a back-arc basin, rotation of the Iberian Plate, and lateral escape accommodated by strike-slip structures like the Transcurrent systems near the Gibraltar Arc. The orogeny exemplifies interactions among major plates and microplates including the African Plate, Eurasian Plate, and the Alboran microplate, and shows analogies to processes in the Carpathians and the Hellenides where slab dynamics govern surface deformation.
Orogenic processes control distribution of mineralization including polymetallic sulfides, barite, and hydrothermal deposits documented near ancient mining districts comparable to works in the Iberian Pyrite Belt and metallogenic provinces of Morocco. Hydrocarbon plays exist in foreland basins like the Gulf of Cadiz and the continental margins adjacent to the Alboran Sea, reflecting syn- and post-orogenic sedimentary architectures. Landscape expression includes relief and drainage reorganization shaping ranges such as Sierra de Grazalema, coastal cliffs near Costa del Sol, and erosional features impacting ports like Almería and Gibraltar (city), with implications for seismicity related to events recorded in catalogs involving the Al Hoceima earthquake and regional seismic sequences.
Category:Geology of Spain Category:Geology of Morocco