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| Alpujarride complex | |
|---|---|
| Name | Alpujarride complex |
| Type | Metamorphic complex |
| Period | Variscan to Alpine |
| Primary lithology | Schist, gneiss, marble |
| Other lithology | Amphibolite, eclogite, migmatite |
| Region | Granada, Almería, Málaga |
| Country | Spain |
Alpujarride complex The Alpujarride complex is a metamorphic terrane in the Betic Cordillera of southern Spain, exposed in the Sierra Nevada and surrounding ranges, that records polyphase Variscan and Alpine tectonism. It has been studied in regional syntheses alongside the Malaguide, Nevado–Filábride, and Subbetic units and compared with outcrops in the Rif, Pyrenees, and Atlas, informing debates on Iberian paleogeography, Alpine orogenesis, and plate convergence. Major investigations involve field mapping, geochronology, structural analysis, and petrological work by researchers affiliated with institutions such as the Consejo Superior de Investigaciones Científicas, University of Granada, and University of Málaga.
The Alpujarride complex crops out in the provinces of Granada, Almería, and Málaga and forms parts of the Internal Zones of the Betic Cordillera, juxtaposed against the Nevado–Filábride complex, Malaguide Complex, and the Alborán Domain. Classical authors such as Ramón y Cajal, José María Roldán, Juan Manuel Jiménez, Vicente Soler, and Francisco Rivas contributed to its mapping and interpretation, while later syntheses by Juan Carlos Roldán, Pedro A. González, and Jesús G. Martínez integrated isotopic dating from laboratories at the Instituto Andaluz de Ciencias de la Tierra and the University of Barcelona.
The complex occupies a position within the Alborán Plate and records interactions between the Eurasian Plate, African Plate, and microplates during Mesozoic–Cenozoic evolution, linked to events like the opening of the Ligurian–Provencal Basin, closure of the Tethys, and emplacement of Betic nappes. Tectonostratigraphic correlations draw comparisons with the External Zones of the Pyrenees, the Rif Chain of Morocco, the Atlas Mountains, and the Corsica–Sardinia block, and studies invoke mechanisms proposed by researchers at NATO, the European Geosciences Union, and the International Union of Geological Sciences.
Lithostratigraphic subdivisions include high‑grade metasedimentary sequences, calcschists, marbles, and intercalated mafic rocks mapped in detailed surveys by the Instituto Geológico y Minero de España and regional geological services. Stratigraphic columns show Variscan crystalline basement overlain by Paleozoic and Mesozoic cover sequences, with Permian and Triassic units followed by Jurassic to Cretaceous platform carbonates and pelagic facies reminiscent of sections studied in the Catalan Coastal Ranges, Balearic Islands, and Alboran Sea.
Metamorphic imprint ranges from greenschist facies to amphibolite and eclogite facies locally, with U–Pb and Ar–Ar ages tied to Variscan metamorphism and Alpine HP–HT events; these results were published by groups including the Geological Survey of Spain and teams using SHRIMP and LA‑ICP‑MS facilities at the ETH Zurich and University of Oxford. Metamorphic P–T paths record prograde burial and subsequent exhumation during subduction and collision episodes analogous to those documented for the Western Alps, Hellenides, and Dinarides, with isotopic work by the CNRS, CSIC, and University of Edinburgh constraining timing.
Structural studies reveal nappe stacking, thrusting, folding, and mylonitization, with detailed kinematic analyses by field parties from the University of Granada and Vrije Universiteit Amsterdam demonstrating a polyphase deformation sequence D1–D3 correlated with Variscan compression and later Alpine extension and transpression. Major shear zones and thrust systems link to basin inversion processes similar to mechanisms proposed for the Pyrenean thrust belt, and geophysical surveys by the Instituto Andaluz de Geofísica supplement surface mapping.
Petrography documents metamorphic assemblages including garnet, staurolite, kyanite, sillimanite, omphacite, glaucophane, and lawsonite in different facies, with microstructural studies performed at the Natural History Museum, University of Cambridge, and Universidad Autónoma de Madrid. Chemical analyses and phase equilibria modeling undertaken by research groups at the Max Planck Institute for Chemistry, Vrije Universiteit, and the University of Toronto have characterized metasomatic processes, crustal anatexis, and peritectic reactions responsible for migmatite formation.
The complex hosts mineral occurrences such as skarn‑type lead‑zinc, marble quarries, decorative stone exploited by regional companies in Granada and Almería, and smaller occurrences of chromium and asbestos historically reported in mining records maintained by the Ministerio de Industria, Comercio y Turismo. Its marble and ornamental rocks have been used in provincial architecture and listed in inventories by museums and cultural heritage agencies in Málaga, Seville, and Madrid.
Key monographs and papers include regional syntheses by Francisco Pelayo, Juan Antonio Martín‑Algarra, and José Antonio Vera, isotopic studies by Graham Pearson and colleagues, and tectonic reconstructions published in journals such as Tectonophysics, Journal of the Geological Society, and International Journal of Earth Sciences. International collaborations involving institutions like the Swiss Federal Institute of Technology, University of Lisbon, and University of Bergen advanced understanding of Alpine orogenic processes, while doctoral theses from the University of Granada and University of Oviedo provided detailed maps and petrological data that remain central to ongoing research.
Category:Geology of Spain Category:Betic Cordillera Category:Metamorphic complexes