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New evidence of Late Cretaceous magmatism on the offshore central West Iberian Margin (Estremadura Spur) from potential field data

2022-06Journal article Open access
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dc.contributor.authorEscada, Cláudia
dc.contributor.authorRepresas, Patricia
dc.contributor.authorSantos, Fernando Monteiro
dc.contributor.authorPereira, Ricardo
dc.contributor.authorMata, João
dc.contributor.authorRosas, Filipe M.
dc.date.accessioned2022-07-18T09:55:10Z
dc.date.available2022-07-18T09:55:10Z
dc.date.issued2022-06
dc.description.abstractABSTRACT: The West Iberian Margin (WIM) is a key example of a magma-poor passive margin, punctuated by several postrift magmatic manifestations that are part of the Late Cretaceous Atlantic Alkaline Province. In this work, potential field (gravity and magnetics) data, constrained by 3D multichannel seismic reflection data, are used to describe and characterise the geometry and nature of magmatic features located offshore the central segment of the margin, the Estremadura Spur. The estimated geometry and nature of the magmatic features was achieved through the integration of 3D gravity and magnetic inversion and 2D magnetic forward modelling. The results provide an insightful 3D subsurface model revealing that: 1) the Estremadura Spur Intrusion represents a 28 x 15 km wide laccolith with an overall granitic nature and an estimated density of 2490-2640 kg/m3 and 0.01-0.05 SI magnetic susceptibility, 2) the 26 x 17 km Fontanelas buried volcano is dominantly basaltic, with density values of 2500-2821 kg/m3 and magnetic susceptibility of 0.01 to 0.0875 SI, and 3) multiple sill complexes intruded the region, thus producing a higher magnetic background on otherwise inconspicuous anomalies The models allowed achieving a confident fit suggesting that both the ESI and the Fontanelas volcano are coeval with the outcropping magmatic features from this same magmatic event. Additionally, the results support that Late Cretaceous alkaline magmatism on the West Iberian Margin is more significant than anticipated and provide further evidence to clarify unclear geometrical aspects of similar intrusions observed onshore. Acknowledging the geometry and nature of these magmatic entities allows to better understand the role of postrift intra-plate magmatism on continental hyper-extended rifted margins by clarifying how shallow plumbing systems evolve in these settings.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationEscada, Cláudia... [et.al.] - New evidence of Late Cretaceous magmatism on the offshore central West Iberian Margin (Estremadura Spur) from potential field data. In: Tectonophysics, 2022, vol. 832, article nº 229354pt_PT
dc.identifier.doi10.1016/j.tecto.2022.229354pt_PT
dc.identifier.eissn1879-3266
dc.identifier.issn0040-1951
dc.identifier.urihttp://hdl.handle.net/10400.9/3885
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationInstituto Dom Luiz
dc.relation.publisherversionhttps://doi.org/10.1016/j.tecto.2022.229354pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectWest Iberian Marginpt_PT
dc.subjectEstremadura Spurpt_PT
dc.subject2D forward modellingpt_PT
dc.subjectLate Cretaceouspt_PT
dc.subjectLusitanian Basinpt_PT
dc.subjectMagmatismpt_PT
dc.subjectGeophysicspt_PT
dc.titleNew evidence of Late Cretaceous magmatism on the offshore central West Iberian Margin (Estremadura Spur) from potential field datapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.titleTectonophysicspt_PT
oaire.citation.volume832pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameEscada
person.familyNameMACHADO MADUREIRA FONTES REPRESAS
person.familyNamePereira
person.familyNameMata
person.familyNameRosas
person.givenNameCláudia
person.givenNamePATRÍCIA
person.givenNameRicardo
person.givenNameJoão
person.givenNameFilipe
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person.identifierI-3352-2012
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person.identifier.orcid0000-0003-4589-1145
person.identifier.orcid0000-0001-5769-7708
person.identifier.orcid0000-0002-6734-2916
person.identifier.ridD-9271-2011
person.identifier.ridA-4104-2013
person.identifier.scopus-author-id57221413702
person.identifier.scopus-author-id36094924000
person.identifier.scopus-author-id7102806167
person.identifier.scopus-author-id15737449500
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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