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Imaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazil

2018-02Journal article Restricted access
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dc.contributor.authorLoureiro, Afonso
dc.contributor.authorSchnürle, P.
dc.contributor.authorKlingelhoefer, Frauke
dc.contributor.authorAfilhado, Alexandra
dc.contributor.authorPinheiro, J.
dc.contributor.authorEvain, Mikael
dc.contributor.authorGallais, F.
dc.contributor.authorDias, Nuno
dc.contributor.authorRabineau, Marina
dc.contributor.authorBaltzer, A.
dc.contributor.authorBenabdellouahed, M.
dc.contributor.authorSoares, J.
dc.contributor.authorFuck, R.
dc.contributor.authorCupertino, J. A.
dc.contributor.authorViana, Adriano Roessler
dc.contributor.authorMatias, Luis
dc.contributor.authorMoulin, Maryline
dc.contributor.authorAslanian, D.
dc.contributor.authorMorvan, L.
dc.contributor.authorMazé, J. P.
dc.contributor.authorPierre, D.
dc.contributor.authorRoudaut-Pitel, M.
dc.contributor.authorRio, I.
dc.contributor.authorAlves, D.
dc.contributor.authorJúnior, P. Barros
dc.contributor.authorBiari, Youssef
dc.contributor.authorCorela, C.
dc.contributor.authorCrozon, J.
dc.contributor.authorDuarte, J. L.
dc.contributor.authorDucatel, C.
dc.contributor.authorFalcão, C.
dc.contributor.authorFernagu, P.
dc.contributor.authorLima, M. Vinicius Aparecido Gomes de
dc.contributor.authorPiver, D. Le
dc.contributor.authorMokeddem, Z.
dc.contributor.authorPelleau, P.
dc.contributor.authorRigoti, C.
dc.contributor.authorRoest, W.
dc.contributor.authorRoudaut, M.
dc.date.accessioned2018-02-27T10:41:42Z
dc.date.available2018-02-27T10:41:42Z
dc.date.issued2018-02
dc.description.abstractTwelve combined wide-angle refraction and coincident multi-channel seismic profiles were acquired in the Jequitinhonha-Camamu-Almada, Jacuípe, and Sergipe-Alagoas basins, NE Brazil, during the SALSA experiment in 2014. Profiles SL11 and SL12 image the Jequitinhonha basin, perpendicularly to the coast, with 15 and 11 four-channel ocean-bottom seismometers, respectively. Profile SL10 runs parallel to the coast, crossing profiles SL11 and SL12, imaging the proximal Jequitinhonha and Almada basins with 17 ocean-bottom seismometers. Forward modelling, combined with pre-stack depth migration to increase the horizontal resolution of the velocity models, indicates that sediment thickness varies between 3.3 km and 6.2 km in the distal basin. Crustal thickness at the western edge of the profiles is of around 20 km, with velocity gradients indicating a continental origin. It decreases to less than 5 km in the distal basin, with high seismic velocities and gradients, not compatible with normal oceanic crust nor exhumed upper mantle. Typical oceanic crust is never imaged along these about 200 km-long profiles and we propose that the transitional crust in the Jequitinhonha basin is a made of exhumed lower continental crust.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLOUREIRO, A.; [et al] – Imaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazil. Journal of South American Earth Sciences. ISSN: 0895-9811. Vol. 84, (2018), pp. 351-372pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.jsames.2018.01.009pt_PT
dc.identifier.issn0895-9811
dc.identifier.urihttp://hdl.handle.net/10400.21/8139
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://ac.els-cdn.com/S0895981117302948/1-s2.0-S0895981117302948-main.pdf?_tid=spdf-f38dc148-7168-4adf-9cea-9ac81a15a014&acdnat=1519723859_8b24c1fb3dbb324138d63e1b144549d1pt_PT
dc.subjectNE Brazilpt_PT
dc.subjectSouth Atlantic Oceanpt_PT
dc.subjectPassive marginspt_PT
dc.subjectWide-angle refraction seismicpt_PT
dc.subjectPSDMpt_PT
dc.subjectCrustal structurept_PT
dc.subjectCretaceous breakuppt_PT
dc.subjectLower continental crustpt_PT
dc.titleImaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazilpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage372pt_PT
oaire.citation.startPage351pt_PT
oaire.citation.titleJournal of South American Earth Sciencespt_PT
oaire.citation.volume84
person.familyNameLoureiro
person.familyNameKlingelhoefer
person.familyNameAfilhado
person.familyNameEvain
person.familyNameDias
person.familyNameRabineau
person.familyNameViana
person.familyNameMatias
person.familyNameMoulin
person.familyNameBiari
person.givenNameAfonso
person.givenNameFrauke
person.givenNameAlexandra
person.givenNameMikael
person.givenNameNuno
person.givenNameMarina
person.givenNameAdriano
person.givenNameLuis
person.givenNameMaryline
person.givenNameYoussef
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rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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