Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone

During the Cenozoic, the geodynamics of the western Mediterranean domain has been characterized by a complex history of subduction of Mesozoic oceanic lithosphere. The final stage of these processes is proposed to have led to the development of the Calabria and Gibraltar arcs, whose formation is sti...

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Autores: Bonnin, Mickaël, Nolet, G., Villaseñor, Antonio, Gallart Muset, Josep, Thomas, Christine
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/102111
Acceso en línea:http://hdl.handle.net/10261/102111
Access Level:acceso abierto
Palabra clave:Seismic tomography
Subduction zone processes
Continental tectonics: compressional
Dynamics of lithosphere and mantle
África
Europe
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spelling Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zoneBonnin, MickaëlNolet, G.Villaseñor, AntonioGallart Muset, JosepThomas, ChristineSeismic tomographySubduction zone processesContinental tectonics: compressionalDynamics of lithosphere and mantleÁfricaEuropeDuring the Cenozoic, the geodynamics of the western Mediterranean domain has been characterized by a complex history of subduction of Mesozoic oceanic lithosphere. The final stage of these processes is proposed to have led to the development of the Calabria and Gibraltar arcs, whose formation is still under debate. In this study, we take advantage of the dense broad-band station networks now available in the Alborán Sea region, to develop a high-resolution 3-D tomographic P velocity model of the upper mantle beneath the African/Iberian collision zone that will better constraint the past dynamics of this zone. The model is based on 13200 teleseismic arrival times recorded between 2008 and 2012 at 279 stations for which cross-correlation delays are measured with a new technique in different frequency bands centred between 0.03 and 1.0 Hz, and for the first time interpreted using multiple frequency tomography. Our model shows, beneath the Alborán Sea, a strong (4 per cent) fast vertically dipping anomaly observed to at least 650 km depth. The arched shape of this anomaly, and its extent at depth, are coherent with a lithospheric slab, thus favouring the hypothesis of a westward consumption of the Ligurian ocean slab by roll-back during Cenozoic. In addition to this fast anomaly in the deep upper mantle, high intensity slow anomalies are widespread in the lithosphere and asthenosphere beneath Morocco and southern Spain. These anomalies are correlated at the surface with the position of the Rif and Atlas orogens and with Cenozoic volcanic fields. We thus confirm the presence, beneath Morocco, of an anomalous (hot?) upper mantle, but without clear indication for a lateral spreading of the Canary plume to the east.The Morocco M¨unster project was funded under grant DFG TH1530/5-1. The deployment and data processing for Spanish stations was funded by Consolider-Ingenio 2010 project TOPOIBERIA (CSD2006-00041) as well as ALERT-ES (CGL2010- 19803-C03-02). This research is supported by the European Research Council (Advanced grant 226837). The figures were produced using the Generic Mapping Tools (GMT) software (Wessel & Smith 1998; Wessel et al. 2013).Peer reviewedOxford University PressConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201420142014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/102111reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1093/gji/ggu214Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1021112026-05-22T06:33:51Z
dc.title.none.fl_str_mv Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
title Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
spellingShingle Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
Bonnin, Mickaël
Seismic tomography
Subduction zone processes
Continental tectonics: compressional
Dynamics of lithosphere and mantle
África
Europe
title_short Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
title_full Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
title_fullStr Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
title_full_unstemmed Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
title_sort Multiple-frequency tomography of the upper mantle beneath the African/Iberian collision zone
dc.creator.none.fl_str_mv Bonnin, Mickaël
Nolet, G.
Villaseñor, Antonio
Gallart Muset, Josep
Thomas, Christine
author Bonnin, Mickaël
author_facet Bonnin, Mickaël
Nolet, G.
Villaseñor, Antonio
Gallart Muset, Josep
Thomas, Christine
author_role author
author2 Nolet, G.
Villaseñor, Antonio
Gallart Muset, Josep
Thomas, Christine
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Seismic tomography
Subduction zone processes
Continental tectonics: compressional
Dynamics of lithosphere and mantle
África
Europe
topic Seismic tomography
Subduction zone processes
Continental tectonics: compressional
Dynamics of lithosphere and mantle
África
Europe
description During the Cenozoic, the geodynamics of the western Mediterranean domain has been characterized by a complex history of subduction of Mesozoic oceanic lithosphere. The final stage of these processes is proposed to have led to the development of the Calabria and Gibraltar arcs, whose formation is still under debate. In this study, we take advantage of the dense broad-band station networks now available in the Alborán Sea region, to develop a high-resolution 3-D tomographic P velocity model of the upper mantle beneath the African/Iberian collision zone that will better constraint the past dynamics of this zone. The model is based on 13200 teleseismic arrival times recorded between 2008 and 2012 at 279 stations for which cross-correlation delays are measured with a new technique in different frequency bands centred between 0.03 and 1.0 Hz, and for the first time interpreted using multiple frequency tomography. Our model shows, beneath the Alborán Sea, a strong (4 per cent) fast vertically dipping anomaly observed to at least 650 km depth. The arched shape of this anomaly, and its extent at depth, are coherent with a lithospheric slab, thus favouring the hypothesis of a westward consumption of the Ligurian ocean slab by roll-back during Cenozoic. In addition to this fast anomaly in the deep upper mantle, high intensity slow anomalies are widespread in the lithosphere and asthenosphere beneath Morocco and southern Spain. These anomalies are correlated at the surface with the position of the Rif and Atlas orogens and with Cenozoic volcanic fields. We thus confirm the presence, beneath Morocco, of an anomalous (hot?) upper mantle, but without clear indication for a lateral spreading of the Canary plume to the east.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014
2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/102111
url http://hdl.handle.net/10261/102111
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1093/gji/ggu214
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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