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      Transpressional collision tectonics and mantle plume dynamics: the Variscides of southwestern Iberia

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          Abstract

          In southwestern Iberia, three continental domains (the South Portuguese Zone (SPZ), Ossa-Morena Zone (OMZ) and Central Iberian Zone (CIZ) collided in Devonian-Carboniferous time. The collision was transpressional, with left-lateral kinematics, and was interrupted by extensional tectonics during the earliest Carboniferous, when bimodal magmatism (with associated mineral deposits) and basin development were the dominant orogenic features. Transpression was renewed in Visean time, and persisted until the end of the Carboniferous. The IBERSEIS deep seismic reflection profile helps to define the 3D geometry of transpressional structures: out-of-section displacements concentrate in bands, which bound wedges of upper crust; this crustal wedging strongly modifies the geometry of the sutures between continental blocks. A mid-crustal strongly reflective thick band (the Iberseis Reflective Body, IRB) is interpreted as a huge body of basic rocks. The IRB magma trapped in the middle crust was linked to the Early Carboniferous mantle-derived magmatism that crops out in the SPZ, OMZ and CIZ. Magmatism at the surface and trapped in the crust, high thermal gradients and basin development reflect a thermal anomaly in the underlying mantle, influencing both the thermal and the stress state of the orogen at that time. A mantle plume is inferred to have existed in the Early Carboniferous, the transpressional tectonic regime dominating again after its decay.

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          Tectonics and plate tectonics model for the Variscan belt of Europe

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            The Variscan collage and orogeny (480-290 Ma) and the tectonic definition of the Armorica microplate: a review

            P Matte (2001)
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              Evolutionary model of the Himalaya–Tibet system: geopoembased on new modelling, geological and geophysical data

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                Author and article information

                Journal
                Geological Society, London, Memoirs
                Geological Society, London, Memoirs
                Geological Society of London
                0435-4052
                2041-4722
                January 01 2006
                2006
                2006
                January 01 2006
                : 32
                : 1
                : 345-354
                Affiliations
                [1 ]Departamento de Geodinámica, Facultad de Ciencias, Universidad de GranadaCampus de Fuentenueva, 18071 Granada, Spain (simancas@ugr.es)
                [2 ]Instituto de Ciencias de la Tierra 'Jaume Almera', Consejo Superior de Investigaciones Científicasc/Lluis Solé i Sabarís s/n, 08028 Barcelona, Spain
                [3 ]Department of Earth Sciences, Uppsala UniversityVillavagen 16, SE-752 36 Uppsala, Sweden
                [4 ]Departamento de Geología, Universidad de Salamanca37008 Salamanca, Spain
                [5 ]Departamento de Geología, Universidad de Huelva21071 Huelva, Spain
                Article
                10.1144/GSL.MEM.2006.032.01.21
                1b6653fe-4ed7-424f-9c18-5f7edc5436c4
                © 2006
                History

                Biochemistry,Animal science & Zoology
                Biochemistry, Animal science & Zoology

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