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Thermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomography

2019-02Journal article Restricted access
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dc.contributor.authorCiviero, Chiara
dc.contributor.authorCustodio, Susana
dc.contributor.authorRawlinson, Nicholas
dc.contributor.authorStrak, Vincent
dc.contributor.authorSilveira, Graça
dc.contributor.authorArroucau, Pierre
dc.contributor.authorCorela, Carlos
dc.date.accessioned2019-05-08T08:14:34Z
dc.date.available2019-05-08T08:14:34Z
dc.date.issued2019-02
dc.description.abstractIndependent 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.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCIVIERO, 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. 1781-1801pt_PT
dc.identifier.doi10.1029/2018JB016531pt_PT
dc.identifier.issn2169-9313
dc.identifier.issn2169-9356
dc.identifier.urihttp://hdl.handle.net/10400.21/9958
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Geophysical Unionpt_PT
dc.relationPTDC/GEO-FIQ/2590/2014 - Fundação para a Ciência e a Tecnologia under the Project SPIDERpt_PT
dc.subjectS-wave tomographypt_PT
dc.subjectIbero-western Maghreb regionpt_PT
dc.subjectLower-upper mantle connectionpt_PT
dc.subjectQuasi-toroidal mantle flowpt_PT
dc.subjectRelative arrival-time residualspt_PT
dc.subjectThermal mantle upwellingspt_PT
dc.titleThermal nature of mantle upwellings below the ibero-western Maghreb region inferred from teleseismic tomographypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1801pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage1781pt_PT
oaire.citation.titleJournal of Geophysical Research. Solid Earthpt_PT
oaire.citation.volume124pt_PT
person.familyNameCiviero
person.familyNameCustódio
person.familyNameRawlinson
person.familyNameStrak
person.familyNameSilveira
person.familyNameArroucau
person.familyNameCorela
person.givenNameChiara
person.givenNameSusana
person.givenNameNicholas
person.givenNameVincent
person.givenNameGraça
person.givenNamePierre
person.givenNameCarlos
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person.identifier.orcid0000-0002-8664-8419
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person.identifier.orcid0000-0003-4142-227X
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person.identifier.scopus-author-id56841629500
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rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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