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Interplay of tectonics and magmatism during post-rift inversion on the central West Iberian Margin (Estremadura Spur)

2021-04Journal article Open access
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dc.contributor.authorPereira, Ricardo
dc.contributor.authorRosas, Filipe M.
dc.contributor.authorMata, João
dc.contributor.authorRepresas, Patricia
dc.contributor.authorEscada, Cláudia
dc.contributor.authorSilva, Beatriz
dc.date.accessioned2022-01-17T13:27:12Z
dc.date.available2022-01-17T13:27:12Z
dc.date.issued2021-04
dc.description.abstractABSTRACT: The combined effects of post-rift magma emplacement and tectonic inversion on the hyper-extended West Iberian Margin are unravelled in detail using multichan nel 2D/3D seismic data. The Estremadura Spur, acting as an uplifted crustal block bounded by two first-order transfer zones, shows evidence of four post-rift tectonic events each with a distinctive seismic-stratigraphic response that can be used to dem onstrate the tectono-magmatic interplay, namely: (a) the Campanian onset of mag matism (including the Fontanelas Volcano, the widespread evidence of multiple sill complexes and the detailed description of a >20 km long laccolith, the Estremadura Spur Intrusion; (b) the Campanian-Maastrichtian NE-SW event pervasively affecting the area, resulting in regional uplift, reverse faulting and folding; (c) the Paleocene mid Eocene inversion that resulted in widespread erosion and; (d) the Oligocene-mid Miocene evidence of rejuvenated NW-SE inversion marked by crestal faulting and forced-fault folding establishing the final geometry of the area. The distinct deforma tion styles within each tectonic phase document a case of decoupled deformation be tween Late Cretaceous and Tertiary units, in response to the predominant stress field evolution, revealing that the magnitude of Late Cretaceous inversion is far more sig nificant than the one affecting the latter units. A detailed analysis of the laccolith and its overburden demonstrate the distinct deformation patterns associated both with magma ascent (including extensional faulting, forced-folding and concentric reverse faulting) and its interference as a rigid intrusive body during subsequent transpres sive inversion. This reinforces the role that the combined tectono-magmatic events played on the margin. Also analysed is the wider impact of post-rift magmatism and the associate emplacement of sub-lithospheric magma on the rheology of a thinned continental crust. This takes into account the simultaneous tectonic inversion of the margin, the implied alternative views on characteristic heat flow, and on how these can be incorporated in source rock organic maturity modelling.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPereira et al. 2021, ‘Interplay of tectonics and magmatism during post-rift inversion on the central West Iberian Margin (Estremadura Spur)’, Basin Research, vol. 33, n.º 2, pp. 1497–1519. doi:10.1111/bre.12524.pt_PT
dc.identifier.doihttps://doi.org/10.1111/bre.12524pt_PT
dc.identifier.eissn1365-2117
dc.identifier.urihttp://hdl.handle.net/10400.9/3700
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWileypt_PT
dc.relationFCT - UIDB/50019/2020 – IDL.pt_PT
dc.relation.publisherversionhttps://onlinelibrary.wiley.com/doi/full/10.1111/bre.12524pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectTectonicspt_PT
dc.subjectMagmatismpt_PT
dc.subjectEstremadura Spurpt_PT
dc.titleInterplay of tectonics and magmatism during post-rift inversion on the central West Iberian Margin (Estremadura Spur)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1519pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage1497pt_PT
oaire.citation.titleBasin Researchpt_PT
oaire.citation.volume33pt_PT
person.familyNamePereira
person.familyNameRosas
person.familyNameMata
person.familyNameMACHADO MADUREIRA FONTES REPRESAS
person.familyNameEscada
person.givenNameRicardo
person.givenNameFilipe
person.givenNameJoão
person.givenNamePATRÍCIA
person.givenNameCláudia
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person.identifier.orcid0000-0002-2987-2836
person.identifier.orcid0000-0002-3855-5947
person.identifier.ridD-9271-2011
person.identifier.ridA-4104-2013
person.identifier.scopus-author-id36094924000
person.identifier.scopus-author-id15737449500
person.identifier.scopus-author-id7102806167
person.identifier.scopus-author-id57221413702
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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