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Response of a multi-domain continental margin to compression: study from seismic reflection-refraction and numerical modelling in the Tagus Abyssal Plain

2009-04Journal article Open access
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dc.contributor.authorNeves, Maria
dc.contributor.authorTerrinha, P.
dc.contributor.authorAfilhado, A.
dc.contributor.authorMoulin, Anne M
dc.contributor.authorMatias, L.
dc.contributor.authorRosas, F.
dc.date.accessioned2018-12-07T14:52:33Z
dc.date.available2018-12-07T14:52:33Z
dc.date.issued2009-04
dc.description.abstractThe effects of the Miocene through Present compression in the Tagus Abyssal Plain are mapped using the most up to date available to scientific community multi-channel seismic reflection and refraction data. Correlation of the rift basin fault pattern with the deep crustal structure is presented along seismic line IAM-5. Four structural domains were recognized. In the oceanic realm mild deformation concentrates in Domain I adjacent to the Tore-Madeira Rise. Domain 2 is characterized by the absence of shortening structures, except near the ocean-continent transition (OCT), implying that Miocene deformation did not propagate into the Abyssal Plain, In Domain 3 we distinguish three sub-domains: Sub-domain 3A which coincides with the OCT, Sub-domain 3B which is a highly deformed adjacent continental segment, and Sub-domain 3C. The Miocene tectonic inversion is mainly accommodated in Domain 3 by oceanwards directed thrusting at the ocean-continent transition and continentwards on the continental slope. Domain 4 corresponds to the non-rifted continental margin where only minor extensional and shortening deformation structures are observed. Finite element numerical models address the response of the various domains to the Miocene compression, emphasizing the long-wavelength differential vertical movements and the role of possible rheologic contrasts. The concentration of the Miocene deformation in the transitional zone (TC), which is the addition of Sub-domain 3A and part of 3B, is a result of two main factors: (1) focusing of compression in an already stressed region due to plate curvature and sediment loading; and (2) theological weakening. We estimate that the frictional strength in the TC is reduced in 30% relative to the surrounding regions. A model of compressive deformation propagation by means of horizontal impingement of the middle continental crust rift wedge and horizontal shearing on serpentinized mantle in the oceanic realm is presented. This model is consistent with both the geological interpretation of seismic data and the results of numerical modelling. (C) 2008 Elsevier B.V. All rights reserved.
dc.description.sponsorshipInstituto Nacional de Engenharia, Tecnologia e Inovacao(INETI); Landmark Graphics Corporation; Landmark University Grant Program; LATTEX/IDL [ISLF-5-32]; FEDER
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.tecto.2008.05.008
dc.identifier.issn0040-1951
dc.identifier.issn1879-3266
dc.identifier.urihttp://hdl.handle.net/10400.1/11117
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectCrustal structure
dc.subjectPlate boundary
dc.subjectDeep-structure
dc.subjectFlemish cap
dc.subjectIberian Peninsula
dc.subjectRifted margins
dc.subjectWest Iberia
dc.subjectTransition
dc.subjectNewfoundland
dc.subjectEvolution
dc.titleResponse of a multi-domain continental margin to compression: study from seismic reflection-refraction and numerical modelling in the Tagus Abyssal Plain
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage130
oaire.citation.issue01-abr
oaire.citation.startPage113
oaire.citation.titleTectonophysics
oaire.citation.volume468
person.familyNameNeves
person.givenNameMaria C.
person.identifier.ciencia-idF016-4214-4A45
person.identifier.orcid0000-0001-5726-3467
person.identifier.ridA-7703-2013
person.identifier.scopus-author-id7103415176
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication5aa08a50-0e64-4d5d-acd6-d817b92e74c5
relation.isAuthorOfPublication.latestForDiscovery5aa08a50-0e64-4d5d-acd6-d817b92e74c5

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