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Wide-angle seismic imaging of divergente and transform segments of the Pará-Maranhão-Barreirinhas-Ceará margin, NW Brazil

2023-07Research article Open access
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authorProfile.emailbiblioteca@isel.pt
datacite.subject.fosCiências Naturais::Ciências Físicas
dc.contributor.authorSchnürle, Philippe
dc.contributor.authorGallais, Flora
dc.contributor.authorAfilhado, Alexandra
dc.contributor.authorMoulin, Maryline
dc.contributor.authorDias, Nuno
dc.contributor.authorSoares, José
dc.contributor.authorLoureiro, Afonso
dc.contributor.authorFuck, Reinhardt
dc.contributor.authorCupertino, José António
dc.contributor.authorViana, Adriano
dc.contributor.authorAslanian, Daniel
dc.date.accessioned2025-09-02T09:53:53Z
dc.date.available2025-09-02T09:53:53Z
dc.date.issued2023-07
dc.description.abstractThe structure of the North-East equatorial Brazilian margin was investigated during the MAGIC (Margins of brAzil, Ghana and Ivory Coast) seismic wide-angle experiment. This study focuses on the MC5 profile, that spans NW-SE 720 km in length, from the São Paulo Double Fracture Zone to the Barreirinhas margin and continental Borborema province. Its main objective is to understand the fundamental processes which lead to the thinning and finally to the breakup of the continental crust in a specific context of a divergent pull-apart system with two strike-slip borders. The experiment was devised to obtain the 2D structure along this profiles from joint pre-stack depth migration of streamer data and travel-time inversion by forward modeling of 43 Ocean Bottom Seismometers and 21 Land Seismic Stations records. Along the MC5 wide-angle transect, 4 major sectors are identified: 1) the São Paulo Double Fracture Zone presenting a 4.5 km thick volcano-sedimentary Basin on top of a 5.5 km thick basement; 2) a volcanic alignment and intermediate domain SE-ward, formed by the 4.5 km thick Basin III; 3) the 7.5 km thick Basin II, and the 5.5 km thick Basin I composing the continental slope and shelf. While all the offshore basement remains about 6 km thick in the deep-sea domains, acoustic velocity evolves from two-layer 4.8–6 km/s and 6.1–6.8 km/s beneath Basin III to two-layer high velocity 6.1–6.8 km/s and 7.2–7.4 km/s beneath Basin II and I, The necking zone, forming the Parnaiba Platform and associated Piaui-Camocim and Ceará Basins, is 50 km wide; 4) the Médio Coreaú and Ceará Central thrust belt, where the un-thinned continental crust thickness reaches 32 km. Finally, a schematic kinematic reconstruction that satisfies these observation is argumented.eng
dc.identifier.citationSchnürle, P., Gallais, F., Afilhado, A., Moulin, M., Dias, N., Soares, J., Loureiro, A., Fuck, R., Cupertino, J. A., Viana, A., & Aslanian, D. (2023). Wide-angle seismic imaging of divergente and transform segments of the Pará-Maranhão-Barreirinhas-Ceará margin, NW Brazil. Journal of South American Earth Sciences, 127, 1-20. https://doi.org/10.1016/j.jsames.2023.104394
dc.identifier.doihttps://doi.org/10.1016/j.jsames.2023.104394
dc.identifier.eissn1873-0647
dc.identifier.issn0895-9811
dc.identifier.urihttp://hdl.handle.net/10400.21/22082
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0895981123002055?via%3Dihub
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectNorth-east equatorial Brazil
dc.subjectTransform margin
dc.subjectDeep seismic structure
dc.titleWide-angle seismic imaging of divergente and transform segments of the Pará-Maranhão-Barreirinhas-Ceará margin, NW Brazileng
dc.typeresearch article
dspace.entity.typePublication
oaire.citation.endPage20
oaire.citation.startPage1
oaire.citation.titleJournal of South American Earth Sciences
oaire.citation.volume127
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43
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
relation.isAuthorOfPublication8c33b6bc-ca31-4d7a-a9e4-a6a694e809d3
relation.isAuthorOfPublication.latestForDiscovery8c33b6bc-ca31-4d7a-a9e4-a6a694e809d3

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