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dc.contributor.authorBessière, Eloïse
dc.contributor.authorAzañón Hernández, José Miguel 
dc.contributor.authorCrespo Blanc, Ana
dc.identifier.citationLateral variations of pressure-temperature evolution in non-cylindrical orogens and 3-D subduction dynamics: the Betic-Rif Cordillera example Eloïse Bessière, Laurent Jolivet, Romain Augier, Stéphane Scaillet, Jacques Précigout, José-Miguel Azañón, Ana Crespo-Blanc, Emmanuel Masini and Damien Do Couto BSGF - Earth Sci. Bull., 192 (2021) 8 DOI: []es_ES
dc.descriptionThis paper is a contribution of the Orogen project funded by Total, BRGM and CNRS-INSU and it benefited from numerous discussions with the Orogen community. The 40Ar/39Ar facility at ISTO was funded and is supported by the ERC Advanced grant RHEOLITH, the LABEX project VOLTAIRE (ANR-10-LABX-100-01), the Région Centre project ARGON, and the project EQUIPEX PLANEX (ANR-11-EQPX-0036). We would to thank the guest-editor David Pedreira and the two reviewers, Juan Soto and André Michard for a really extensive analysis of our manuscript, which is obviously in better shape now. Special thanks are due to Federico Rossetti who commented on an early version of the manuscript.es_ES
dc.description.abstractThe long-term Pressure-Temperature-time-deformation (P-T-t-d) evolution of the internal zones of orogens results from complex interactions between the subducting lithosphere, the overriding plate and the intervening asthenosphere. 2-D numerical models successfully reproduce natural P-T-t-d paths, but most orogens are non-cylindrical and the situation is far more complex due to 3-D pre-orogenic inheritance and 3-D subduction dynamics. The Mediterranean orogens are intrinsically non-cylindrical. Their 3-D geometry results from the complex shape of the Eurasian and African margins before convergence and from the dynamics of slab retreat and tearing leading to strongly arcuate belts. More than many other segments, the Betic-Rif belt is archetypal of this behavior. A synthesis of the tectonometamorphic evolution of the Internal Zones, also based on recent findings by our group in the framework of the Orogen Project (Alboran domain, including the Alpujarride-Sebtide and Nevado-Filabride complexes) shows the relations in space and time between tectonic and P-T evolutions. The reinterpretation of the contact between peridotite massifs and Mesozoic sediments as an extensional detachment leads to a discussion of the geodynamic setting and timing of mantle exhumation. Based on new Ar-40/Ar-39 ages in the Alpujarride-Sebtide complex and a discussion of published ages in the Nevado-Filabride complex, we conclude that the age of the HP-LT metamorphism is Eocene in all complexes. A first-order observation is the contrast between the well-preserved Eocene HP-LT blueschists-facies rocks of the eastern Alpujarride-Sebtide Complex and the younger HT-LP conditions reaching partial melting recorded in the Western Alpujarride. We propose a model where the large longitudinal variations in the P-T evolution are mainly due to (i) differences in the timing of subduction and exhumation, (ii) the nature of the subducting lithosphere and (iii) a major change in subduction dynamics at similar to 20 Ma associated with a slab-tearing event. The clustering of radiometric ages obtained with different methods around 20 Ma results from a regional exhumation episode coeval with slab tearing, westward migration of the trench, back-arc extension and thrusting of the whole orogen onto the African and Iberian margins.es_ES
dc.description.sponsorshipCentre National de la Recherche Scientifique (CNRS)es_ES
dc.description.sponsorshipERC Advanced grant RHEOLITHes_ES
dc.description.sponsorshipLABEX project VOLTAIRE ANR-10-LABX-100-01es_ES
dc.description.sponsorshipRegion Centre project ARGONes_ES
dc.description.sponsorshipproject EQUIPEX PLANEX ANR-11-EQPX-0036es_ES
dc.publisherEDP Scienceses_ES
dc.rightsAtribución 3.0 España*
dc.subjectBetic Cordilleraes_ES
dc.subjectSubduction dynamicses_ES
dc.subjectSlab retreates_ES
dc.subjectHigh pressure metamorphismes_ES
dc.subjectSub-continental peridotiteses_ES
dc.titleLateral variations of pressure-temperature evolution in non-cylindrical orogens and 3-D subduction dynamics: the Betic-Rif Cordillera examplees_ES

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Atribución 3.0 España
Except where otherwise noted, this item's license is described as Atribución 3.0 España