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Crustal structure across the São Miguel Island (Azores, North Atlantic) and tectonic implications

2022-11-03Journal article Restricted access
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dc.contributor.authorBatista, L.
dc.contributor.authorHübscher, C.
dc.contributor.authorTerrinha, P.
dc.contributor.authorMatias, L.
dc.contributor.authorAfilhado, Alexandra
dc.contributor.authorLoureiro, A.
dc.contributor.authorWeiß, B.
dc.date.accessioned2023-05-05T07:40:46Z
dc.date.available2023-05-05T07:40:46Z
dc.date.issued2022-11-03
dc.description.abstractThe crustal and uppermost lithospheric mantle of the São Miguel Island in the Azores Plateau was investigated using one 160 km long refraction and wide angle refection seismic profle across the island and the Terceira Rift along with multichan nel seismic refection profles on the top of it. P-wave velocity model shows that São Miguel Island is made up of 5 crustal layers. The sedimentary sequence varies between 150 and 1500 m of thickness and the upper and lower crusts vary from 6 km to maximum thickness of >10 km altogether. The Moho discontinuity lies at 15 km of depth underneath the island and at 11 km outside the island and rift. A 125 km-long layer with a maximum thickness of 2.5 km and Vp of 7.6 km/s is defned at the base of the crust. We speculate that this lens-shaped layer consists of gabbro cumulates formed by magmatic underplating. Extensional southwards directed simple shear across the whole crust and the Moho discontinuity – São Miguel Deep Ductile Deformation Zone – causes uplift, northwards tilting of the island and landslides. Decoupling between ductile deformation in depth and brittle deformation in the shallow levels caused the formation of a rift half-graben flled in with 1500 m of sediments and various mass transport deposits. The São Miguel Deep Ductile Deformation Zone is considered as a difuse plate boundary where deformation is accommodated by brittle mechanisms (seismicity) and plastic fow (lateral thickness variation of the lower crust).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBATISTA, L.; [et al] – Crustal structure across the São Miguel Island (Azores, North Atlantic) and tectonic implications. Marine Geophysical Research. eISSN 1573-0581. Vol. 43, N.º 4 (2022), pp. 1-17.pt_PT
dc.identifier.doi10.1007/s11001-022-09503-ypt_PT
dc.identifier.eissn1573-0581
dc.identifier.issn0025-3235
dc.identifier.urihttp://hdl.handle.net/10400.21/15980
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationSFRH/ BD/81351/2011 - FCTpt_PT
dc.relation.publisherversionhttps://link.springer.com/article/10.1007/s11001-022-09503-ypt_PT
dc.subjectAzores Plateaupt_PT
dc.subjectTerceira riftpt_PT
dc.subjectCrustal structurept_PT
dc.subjectUnderplatingpt_PT
dc.subjectNon-volcanic seismicitypt_PT
dc.titleCrustal structure across the São Miguel Island (Azores, North Atlantic) and tectonic implicationspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage17pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleMarine Geophysical Researchpt_PT
oaire.citation.volume43pt_PT
person.familyNameAfilhado
person.givenNameAlexandra
person.identifier.ciencia-id7314-CD91-482F
person.identifier.orcid0000-0003-0256-8540
person.identifier.ridA-2267-2013
person.identifier.scopus-author-id24381876200
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication8c33b6bc-ca31-4d7a-a9e4-a6a694e809d3
relation.isAuthorOfPublication.latestForDiscovery8c33b6bc-ca31-4d7a-a9e4-a6a694e809d3

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