Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.21/9958 |
Resumo: | Independent models of P wave and S wave velocity anomalies in the mantle derived from seismic tomography help to distinguish thermal signatures from those of partial melt, volatiles, and compositional variations. Here we use seismic data from SW Europe and NW Africa, spanning the region between the Pyrenees and the Canaries, in order to obtain a new S-SKS relative arrival-time tomographic model of the upper mantle below Iberia, Western Morocco, and the Canaries. Similar to previous P wave tomographic results, the S wave model provides evidence for (1) subvertical upper-mantle low-velocity structures below the Canaries, Atlas Ranges, and Gibraltar Arc, which are interpreted as mantle upwellings fed by a common lower-mantle source below the Canaries; and (2) two low-velocity anomalies below the eastern Rif and Betics that we interpret as the result of the interaction between quasi-toroidal mantle flow induced by the Gibraltar slab and the mantle upwelling behind it. The analysis of teleseismic P wave and S wave arrival-time residuals and the conversion of the low-velocity anomalies to temperature variations suggest that the upwellings in the upper mantle below the Canaries, Atlas Ranges, and Gibraltar Arc system may be solely thermal in nature, with temperature excesses in the range similar to 100-350 degrees C. Our results also indicate that local partial melting can be present at lithospheric depths, especially below the Atlas Ranges. The locations of thermal mantle upwellings are in good agreement with those of thinned lithosphere, moderate to high heat-flow measurements, and recent magmatic activity at the surface. |
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Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomographyS-wave tomographyIbero-western Maghreb regionLower-upper mantle connectionQuasi-toroidal mantle flowRelative arrival-time residualsThermal mantle upwellingsIndependent models of P wave and S wave velocity anomalies in the mantle derived from seismic tomography help to distinguish thermal signatures from those of partial melt, volatiles, and compositional variations. Here we use seismic data from SW Europe and NW Africa, spanning the region between the Pyrenees and the Canaries, in order to obtain a new S-SKS relative arrival-time tomographic model of the upper mantle below Iberia, Western Morocco, and the Canaries. Similar to previous P wave tomographic results, the S wave model provides evidence for (1) subvertical upper-mantle low-velocity structures below the Canaries, Atlas Ranges, and Gibraltar Arc, which are interpreted as mantle upwellings fed by a common lower-mantle source below the Canaries; and (2) two low-velocity anomalies below the eastern Rif and Betics that we interpret as the result of the interaction between quasi-toroidal mantle flow induced by the Gibraltar slab and the mantle upwelling behind it. The analysis of teleseismic P wave and S wave arrival-time residuals and the conversion of the low-velocity anomalies to temperature variations suggest that the upwellings in the upper mantle below the Canaries, Atlas Ranges, and Gibraltar Arc system may be solely thermal in nature, with temperature excesses in the range similar to 100-350 degrees C. Our results also indicate that local partial melting can be present at lithospheric depths, especially below the Atlas Ranges. The locations of thermal mantle upwellings are in good agreement with those of thinned lithosphere, moderate to high heat-flow measurements, and recent magmatic activity at the surface.American Geophysical UnionRCIPLCiviero, ChiaraCustodio, SusanaRawlinson, NicholasStrak, VincentSilveira, GraçaArroucau, PierreCorela, Carlos2019-05-08T08:14:34Z2019-022019-02-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/9958engCIVIERO, Chiara; [et al] – Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography. Journal of Geophysical Research Solid Earth. ISSN 2169-9313. Vol. 124, N.º 2 (2019), pp. 1781-18012169-931310.1029/2018JB016531metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T09:59:19Zoai:repositorio.ipl.pt:10400.21/9958Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:18:28.236898Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
title |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
spellingShingle |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography Civiero, Chiara S-wave tomography Ibero-western Maghreb region Lower-upper mantle connection Quasi-toroidal mantle flow Relative arrival-time residuals Thermal mantle upwellings |
title_short |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
title_full |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
title_fullStr |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
title_full_unstemmed |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
title_sort |
Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography |
author |
Civiero, Chiara |
author_facet |
Civiero, Chiara Custodio, Susana Rawlinson, Nicholas Strak, Vincent Silveira, Graça Arroucau, Pierre Corela, Carlos |
author_role |
author |
author2 |
Custodio, Susana Rawlinson, Nicholas Strak, Vincent Silveira, Graça Arroucau, Pierre Corela, Carlos |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Civiero, Chiara Custodio, Susana Rawlinson, Nicholas Strak, Vincent Silveira, Graça Arroucau, Pierre Corela, Carlos |
dc.subject.por.fl_str_mv |
S-wave tomography Ibero-western Maghreb region Lower-upper mantle connection Quasi-toroidal mantle flow Relative arrival-time residuals Thermal mantle upwellings |
topic |
S-wave tomography Ibero-western Maghreb region Lower-upper mantle connection Quasi-toroidal mantle flow Relative arrival-time residuals Thermal mantle upwellings |
description |
Independent models of P wave and S wave velocity anomalies in the mantle derived from seismic tomography help to distinguish thermal signatures from those of partial melt, volatiles, and compositional variations. Here we use seismic data from SW Europe and NW Africa, spanning the region between the Pyrenees and the Canaries, in order to obtain a new S-SKS relative arrival-time tomographic model of the upper mantle below Iberia, Western Morocco, and the Canaries. Similar to previous P wave tomographic results, the S wave model provides evidence for (1) subvertical upper-mantle low-velocity structures below the Canaries, Atlas Ranges, and Gibraltar Arc, which are interpreted as mantle upwellings fed by a common lower-mantle source below the Canaries; and (2) two low-velocity anomalies below the eastern Rif and Betics that we interpret as the result of the interaction between quasi-toroidal mantle flow induced by the Gibraltar slab and the mantle upwelling behind it. The analysis of teleseismic P wave and S wave arrival-time residuals and the conversion of the low-velocity anomalies to temperature variations suggest that the upwellings in the upper mantle below the Canaries, Atlas Ranges, and Gibraltar Arc system may be solely thermal in nature, with temperature excesses in the range similar to 100-350 degrees C. Our results also indicate that local partial melting can be present at lithospheric depths, especially below the Atlas Ranges. The locations of thermal mantle upwellings are in good agreement with those of thinned lithosphere, moderate to high heat-flow measurements, and recent magmatic activity at the surface. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-05-08T08:14:34Z 2019-02 2019-02-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.21/9958 |
url |
http://hdl.handle.net/10400.21/9958 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
CIVIERO, Chiara; [et al] – Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography. Journal of Geophysical Research Solid Earth. ISSN 2169-9313. Vol. 124, N.º 2 (2019), pp. 1781-1801 2169-9313 10.1029/2018JB016531 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
American Geophysical Union |
publisher.none.fl_str_mv |
American Geophysical Union |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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