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Deep structure of the North Natal Valley (Mozambique) using combined wide-angle and reflection seismic data

2021-04Journal article Restricted access
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dc.contributor.authorLepretre, A.
dc.contributor.authorSchnurle, P.
dc.contributor.authorEvain, Mikael
dc.contributor.authorVerrier, F.
dc.contributor.authorMoorcroft, D.
dc.contributor.authorClarens, P. de
dc.contributor.authorCorela, C.
dc.contributor.authorAfilhado, Alexandra
dc.contributor.authorLoureiro, Afonso
dc.contributor.authorLEROY, Sylvie
dc.contributor.authorD'Acremont, Elia
dc.contributor.authorThompson, J.
dc.contributor.authorAslanian, D.
dc.contributor.authorMoulin, Maryline
dc.date.accessioned2021-06-04T11:05:57Z
dc.date.available2021-06-04T11:05:57Z
dc.date.issued2021-04
dc.description.abstractThe North Natal Valley (NNV) and the Mozambique Coastal Plain (MCP) are key areas for the understanding of the SW Indian Ocean history since the Gondwana break-up. Nevertheless, the deep structures and the nature of the NNV and MCP remain discussed in the absence of deep geophysical data. In 2016, the NNV, MCP and Limpopo margin (LM) have been investigated along seven wide-angle and MCS profiles. The combined wide-angle and reflection seismic interpretation along the N-S MZ7 profile reveals an upper sedimentary sequence characterized by low velocities generally not exceeding 3 km/s, with thicknesses varying from 0.150 km in the central part to similar to 2.8 km in the south. The underlying sequence is formed of a 2.53.0 km thick volcano-sedimentary sequence which presents important lateral and with depth changes and presence of high velocity lenses, indicating inter-bedded volcanic sills and recurrent magmatic episodes. The south of the NNV including the Naude Ridge (NR) presents a disturbed sedimentary cover with structural highs and southward-dipping reflectors and sub-basins. The crust, reaching 35-40 km onshore below the MCP, gently thins below the continental shelf to a regular thickness of similar to 29 km below the NNV. Crustal velocities reveal low velocity gradients, with atypical high velocities. South the ND, the crust thins to 15 km. We interpret the velocity architecture combined with the evidences of volcanism at shallower depths as indicating an intensively intruded continental crust. Contrary to what is proposed in most geodynamic models, the Mozambique Coastal plain and the Natal Valley are both of continental nature, with an abrupt necking zone located south of NR. The Antarctica plate was therefore situated at the eastern limit of these two domains before the Gondwana breakup.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLEPRETRE, A.; [et al] – Deep structure of the North Natal Valley (Mozambique) using combined wide-angle and reflection seismic data. Journal of Geophysical Research Solid Earth. ISSN 2169-9313. Vol. 126, N.º 4 (2021), pp. 1-28pt_PT
dc.identifier.doi10.1029/2020JB021171pt_PT
dc.identifier.eissn2169-9356
dc.identifier.issn2169-9313
dc.identifier.urihttp://hdl.handle.net/10400.21/13417
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Geophysical Unionpt_PT
dc.relation.publisherversionhttps://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JB021171pt_PT
dc.subjectContinental crustpt_PT
dc.subjectMozambiquept_PT
dc.subjectNatal Valleypt_PT
dc.subjectPassive marginpt_PT
dc.subjectAngle seismicpt_PT
dc.titleDeep structure of the North Natal Valley (Mozambique) using combined wide-angle and reflection seismic datapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage28pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of Geophysical Research Solid Earthpt_PT
oaire.citation.volume126pt_PT
person.familyNameEvain
person.familyNameAfilhado
person.familyNameLoureiro
person.familyNameLEROY
person.familyNamed'Acremont
person.familyNameMoulin
person.givenNameMikael
person.givenNameAlexandra
person.givenNameAfonso
person.givenNameSylvie
person.givenNameElia
person.givenNameMaryline
person.identifier.ciencia-id7314-CD91-482F
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person.identifier.orcid0000-0002-4387-5785
person.identifier.orcid0000-0003-0256-8540
person.identifier.orcid0000-0002-3762-586X
person.identifier.orcid0000-0002-3188-8802
person.identifier.orcid0000-0002-3345-1401
person.identifier.orcid0000-0002-5685-2451
person.identifier.ridA-2267-2013
person.identifier.ridF-7231-2015
person.identifier.ridG-5956-2010
person.identifier.ridD-5242-2016
person.identifier.scopus-author-id53063345900
person.identifier.scopus-author-id24381876200
person.identifier.scopus-author-id55670384500
person.identifier.scopus-author-id6508332037
person.identifier.scopus-author-id36794837000
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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