Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response

The modes in which the lithosphere deforms during continental collision and the mechanisms involved are not well understood. While continental subduction and mantle delamination are often invoked in tectonophysical studies, these processes are difficult to be confirmed in more complex tectonic regio...

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Autores: Jimenez-Munt, Ivone, Torné, Montserrat, Fernández Ortiga, Manel, Vergés Masip, Jaume, Kumar, Ajay, Carballo, Arkaitz, García-Castellanos, Daniel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/197792
Acceso en línea:http://hdl.handle.net/10261/197792
Access Level:acceso abierto
Palabra clave:Thermophysical properties of the lithosphere
Upper mantle composition
Potential fields
Petrological modeling
Gibraltar Arc and Atlas Mountains Betic-Rif orogenic system
Alboran Basin
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spelling Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic ResponseJimenez-Munt, IvoneTorné, MontserratFernández Ortiga, ManelVergés Masip, JaumeKumar, AjayCarballo, ArkaitzGarcía-Castellanos, DanielThermophysical properties of the lithosphereUpper mantle compositionPotential fieldsPetrological modelingGibraltar Arc and Atlas Mountains Betic-Rif orogenic systemAlboran BasinThe modes in which the lithosphere deforms during continental collision and the mechanisms involved are not well understood. While continental subduction and mantle delamination are often invoked in tectonophysical studies, these processes are difficult to be confirmed in more complex tectonic regions such as the Gibraltar Arc. We study the present-day density and compositional structure of the lithosphere along a transect running from South Iberia to North Africa crossing the western Gibraltar Arc. This region is located in the westernmost continental segment of the African-Eurasian plates, characterized by a diffuse transpressive plate boundary. An integrated and self-consistent geophysical-petrological methodology is used to model the lithosphere structure variations and the thermophysical properties of the upper mantle. The crustal structure is mainly constrained by seismic experiments and geological data, whereas the composition of the lithospheric mantle is constrained by xenolith data. The results show large lateral variations in the topography of the lithosphere-asthenosphere boundary. We distinguish different chemical lithospheric mantle domains that reproduce the main trends of the geophysical observables and the modeled P and S wave seismic velocities. A sublithospheric body colder than the surrounding mantle is needed beneath the Betics-Rif to adjust the measured potential fields. We link this body to the Iberian slab localized just to the east of the profile and having some effect on the geoid and Bouguer anomalies. Local isostasy allows explaining most of the topography, but an elastic thickness higher than 10 km is needed to explain local misfits between the Atlas and the Rif Mountains.Funding was granted by the Spanish Government through the project MITE (CGL2014‐59516‐P) and projects Alpimed (PIE‐CSIC‐201530E082) and Subtetis (PIE‐CSIC‐201830E039). A. C. benefitted from a JAE‐Pre‐CP grant from CSIC. A. K. benefitted from EU Marie Curie Initial Training Network “SUBITOP” (674899‐SUBITOP‐H2020‐MSCA‐ITN‐2015).Peer reviewedAmerican Geophysical UnionEuropean CommissionMinisterio de Economía y Competitividad (España)Jimenez-Munt, Ivone [0000-0003-4178-3585]Torné, Montserrat [0000-0001-6585-4283 ]Fernandez, Manel [0000-0002-4487-2359]Vergés, Jaume [0000-0002-4467-5291]García-Castellanos, Daniel [0000-0001-8454-8572]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/197792reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/674899info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2014-59516-Phttps://doi.org/10.1029/2019JB018445Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1977922026-05-22T06:33:51Z
dc.title.none.fl_str_mv Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
title Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
spellingShingle Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
Jimenez-Munt, Ivone
Thermophysical properties of the lithosphere
Upper mantle composition
Potential fields
Petrological modeling
Gibraltar Arc and Atlas Mountains Betic-Rif orogenic system
Alboran Basin
title_short Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
title_full Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
title_fullStr Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
title_full_unstemmed Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
title_sort Deep Seated Density Anomalies Across the Iberia-Africa Plate Boundary and Its Topographic Response
dc.creator.none.fl_str_mv Jimenez-Munt, Ivone
Torné, Montserrat
Fernández Ortiga, Manel
Vergés Masip, Jaume
Kumar, Ajay
Carballo, Arkaitz
García-Castellanos, Daniel
author Jimenez-Munt, Ivone
author_facet Jimenez-Munt, Ivone
Torné, Montserrat
Fernández Ortiga, Manel
Vergés Masip, Jaume
Kumar, Ajay
Carballo, Arkaitz
García-Castellanos, Daniel
author_role author
author2 Torné, Montserrat
Fernández Ortiga, Manel
Vergés Masip, Jaume
Kumar, Ajay
Carballo, Arkaitz
García-Castellanos, Daniel
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Economía y Competitividad (España)
Jimenez-Munt, Ivone [0000-0003-4178-3585]
Torné, Montserrat [0000-0001-6585-4283 ]
Fernandez, Manel [0000-0002-4487-2359]
Vergés, Jaume [0000-0002-4467-5291]
García-Castellanos, Daniel [0000-0001-8454-8572]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Thermophysical properties of the lithosphere
Upper mantle composition
Potential fields
Petrological modeling
Gibraltar Arc and Atlas Mountains Betic-Rif orogenic system
Alboran Basin
topic Thermophysical properties of the lithosphere
Upper mantle composition
Potential fields
Petrological modeling
Gibraltar Arc and Atlas Mountains Betic-Rif orogenic system
Alboran Basin
description The modes in which the lithosphere deforms during continental collision and the mechanisms involved are not well understood. While continental subduction and mantle delamination are often invoked in tectonophysical studies, these processes are difficult to be confirmed in more complex tectonic regions such as the Gibraltar Arc. We study the present-day density and compositional structure of the lithosphere along a transect running from South Iberia to North Africa crossing the western Gibraltar Arc. This region is located in the westernmost continental segment of the African-Eurasian plates, characterized by a diffuse transpressive plate boundary. An integrated and self-consistent geophysical-petrological methodology is used to model the lithosphere structure variations and the thermophysical properties of the upper mantle. The crustal structure is mainly constrained by seismic experiments and geological data, whereas the composition of the lithospheric mantle is constrained by xenolith data. The results show large lateral variations in the topography of the lithosphere-asthenosphere boundary. We distinguish different chemical lithospheric mantle domains that reproduce the main trends of the geophysical observables and the modeled P and S wave seismic velocities. A sublithospheric body colder than the surrounding mantle is needed beneath the Betics-Rif to adjust the measured potential fields. We link this body to the Iberian slab localized just to the east of the profile and having some effect on the geoid and Bouguer anomalies. Local isostasy allows explaining most of the topography, but an elastic thickness higher than 10 km is needed to explain local misfits between the Atlas and the Rif Mountains.
publishDate 2019
dc.date.none.fl_str_mv 2019
2020
2020
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/10261/197792
url http://hdl.handle.net/10261/197792
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/674899
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2014-59516-P
https://doi.org/10.1029/2019JB018445
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
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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