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From the lebombo monocline to the Mozambique deep basin, using combined wide-angle and reflection seismic data

2023-05-20Research article Open access
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authorProfile.emailbiblioteca@isel.pt
datacite.subject.fosCiências Naturais::Ciências Físicas
dc.contributor.authorMoulin, Maryline
dc.contributor.authorLeprêtre, Angelique
dc.contributor.authorVerrier, Fanny
dc.contributor.authorSchnürle, Philippe
dc.contributor.authorEvain, Mikael
dc.contributor.authorClarens, Philippe
dc.contributor.authorThompson, Joseph
dc.contributor.authorDias, Nuno
dc.contributor.authorAfilhado, Alexandra
dc.contributor.authorLoureiro, Afonso
dc.contributor.authorAslanian, Daniel
dc.date.accessioned2025-09-11T13:08:14Z
dc.date.available2025-09-11T13:08:14Z
dc.date.issued2023-05-20
dc.description.abstractThe North Natal valley (NNV), South Mozambique margin, is a key area for the understanding of the SW Indian Ocean history since the Gondwana break-up as its crustal nature and geometry strongly impacted the recon-struction of the paleogeography before the rifting. It is also of considerable importance for the understanding of the evolution of a margin system as the NNV is situated at the transition between divergent and strike-slip segments and at the conjunction of Oxfordian-Kimmeridgian Indian Ocean and the Valanginian-Aptian Atlantic one. As one part of the PAMELA project (PAssive Margins Exploration Laboratories), the NNV and the East Limpopo margin have been investigated during the MOZ3/5 cruise (2016), through the acquisition of 7 intersecting wide-angle profiles and coincident marine multichannel (720 traces) seismic as well as potential field data. Simultaneously, land seismometers were deployed in the Mozambique coastal plain (MCP), extending six of those profiles on land for about 100 km in order to provide information on the onshore-offshore transition. Wide-angle seismic data are of major importance as they can highlight constraints on the crustal structure of the margin and the position of the continent-ocean boundary in an area where the crustal nature is poorly known and largely controversial. The MOZ3/5 data set therefore reveals new essential constraints for kinematic re-constructions. This work presents results on the crustal structure from P-waves velocity modeling along two E-W wide-angle profiles (MZ1 and MZ2) through the NNV, from the Lebombo Monocline to the Mozambique Basin (MB), and crossing the Mozambique Fracture Zone (MFZ). The new geophysical data reveals an upper sedimentary sequence characterized by low velocities generally not exceeding 3 km/s, and up to 3 km thick where a major contouritic structure was observed. This feature formes together with several other contouritic structures, a N-S alignment just west of the MFZ, which produces high positive gravity anomalies, previously thought to be related to the magmatism that built the Galathea and Dana Plateaus. High velocity lenses are locally identified through the sedimentary layers and interpreted as inter-bedded volcanic sills. Furthermore, from the NNV to the MFZ, the underlying sequence is formed of a 3.0-3.5 km thick volcano-sedimentary sequence presenting important lateral changes in its seismic signature and characterized by a large velocity range (4.4 to 5.8 km/s), which partly reflects variations in the volcanic/sedi-mentary ratio laterally and with depth. At depth, an initially smoother and reduced eastward thinning of the crust occurs to the West below the continental shelf, from 34 to 31 km thick. The crustal thickness remains relatively constant of about 28-29 km along the Central Domain (CD), whereas a second and major region of thinning (26 to 12 km thick) is imaged West of the MFZ, in the southward prolongation of the Limpopo Corridor (LC). By contrast, as the eastern extremity, the crust is <10 km thick when reaching the MB. Crustal velocities reveal low velocity gradients, with atypical high velocities, increasing to 7.3 to 7.6 km/s at the base of the crust, and globally in the whole crust in the LC, just West of the MFZ. We interpreted the velocity architecture com-bined with the evidence of volcanism at shallower depths as indicative of an intensively intruded continentaleng
dc.identifier.citationMoulin, M., Leprêtre, A., Verrier, F., Schnürle, P., Evain, M., Clarens, P., Thompson, J., Dias, N., Afilhhado, A., Loureiro, A., & Aslainian, D. (2023). From the lebombo monocline to the Mozambique deep basin, using combined wide-angle and reflection seismic data. Tectonophysics, 855, 1-30. https://doi.org/10.1016/j.tecto.2023.229814
dc.identifier.doihttps://doi.org/10.1016/j.tecto.2023.229814
dc.identifier.eissn1879-3266
dc.identifier.issn0040-1951
dc.identifier.urihttp://hdl.handle.net/10400.21/22134
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0040195123001129?via%3Dihub
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectMozambique channel
dc.subjectNorth Natal Valley
dc.subjectSedimentary and crustal architecture
dc.subjectCoincident wide-angle and marine multi
dc.subjectChannel profiles
dc.subjectMargin formation
dc.subjectLower continental crust
dc.titleFrom the lebombo monocline to the Mozambique deep basin, using combined wide-angle and reflection seismic dataeng
dc.typeresearch article
dspace.entity.typePublication
oaire.citation.endPage30
oaire.citation.startPage1
oaire.citation.titleTectonophysics
oaire.citation.volume855
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43
person.familyNameMoulin
person.familyNameEvain
person.familyNameDias
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person.familyNameLoureiro
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person.givenNameMaryline
person.givenNameMikael
person.givenNameNuno
person.givenNameAlexandra
person.givenNameAfonso
person.givenNameDaniel
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