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Geochemical and Sr-Nd isotope constraints on the provenance of Permian deposits from Mozambique's Lower Karoo Zambezi Basin

2026-06Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
dc.contributor.authorJorge, Raul C. G. Santos
dc.contributor.authorFernandes, Paulo
dc.contributor.authorPereira, Zélia
dc.contributor.authorSantos, José Francisco
dc.contributor.authorLopes, Gilda
dc.contributor.authorMarques, João
dc.date.accessioned2026-04-22T15:13:18Z
dc.date.available2026-04-22T15:13:18Z
dc.date.issued2026-06
dc.description.abstractABSTRACT: Whole-rock geochemistry and Sr-Nd isotopic compositions of Permian mudrocks from the Moatize and Matinde formations were analysed to constrain the sediment provenance, weathering history and palaeogeographic setting of the Moatize - Minjova Sub-Basin in the Karoo Zambezi Basin of Mozambique. The geochemical signatures of both formations suggest minimal effects of recycling and sorting, and point to rapid sediment deposition within an active tectonic setting. Trace element systematics and key provenance ratios (Th/Sc, La/Sc, Cr/Th, La-N/Sm-N,Sm- Eu/Eu & lowast;) indicate heterogeneous source areas dominated by felsic rocks with a minor mafic contribution. The mudrocks of the Moatize and Matinde formations exhibit similar isotopic signatures, with epsilon Nd (t) values of -9.32 +/- 0.74 and -7.99 +/- 1.10, and Nd T-DM model ages of 1.68 +/- 0.08 and 1.51 +/- 0.12 Ga, respectively. These isotopic signatures indicate that both formations were derived from mixed sources, including late Mesoproterozoic and Neoproterozoic rocks from southern Malawi, the Nampula Block (a subdomain of southernmost Malawi), the Guro Suite and the Macossa-Chimoio Nappe. Both Moatize and Matinde mudrocks exhibit high Chemical Index of Alteration (>85) and Chemical Index of Weathering (>90) values, along with low Index of Compositional Variability and low K/Cs ratios. The Al2O3-(CaO + Na2O)-K2O (A-CN-K) relationships indicate that the Moatize and Matinde mudrocks have not undergone post-depositional K-metasomatism. The data collectively indicate intense palaeoweathering conditions in the source areas. Furthermore, the weathering indices suggest warm and humid palaeoclimate during the deposition of the Moatize and Matinde formations. These formations were deposited in a confined continental basin between the Guadalupian (middle Permian) and the Lopingian (late Permian).eng
dc.identifier.citationJorge, R.C.G.S., Fernandes, P., Pereira, Z., Santos, J.F., Lopes, G., & Marques, J. (2026). Geochemical and Sr-Nd isotope constraints on the provenance of Permian deposits from Mozambique's Lower Karoo Zambezi Basin. In: Journal of African Earth Sciences, 2026, vol. 238, article 106106. https://doi.org/10.1016/j.jafrearsci.2026.106106
dc.identifier.doi10.1016/j.jafrearsci.2026.106106
dc.identifier.issn1464-343X
dc.identifier.urihttp://hdl.handle.net/10400.9/6353
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationInstituto Dom Luiz
dc.relationPermian-Triassic palaeoclimatic cycles of the Karoo Supergroup in Mozambique, and its implications on a changing world
dc.relationAquatic Research Infrastructure Network
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.relationGeoBioSciences GeoTechnologies and GeoEngineering
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S1464343X26001159
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectGeochemistry
dc.subjectPalaeogeography
dc.subjectPalaeoweathering history
dc.subjectMoatize
dc.subjectCrustal evolution
dc.subjectKaroo
dc.subjectZambezia
dc.subjectMozambique
dc.titleGeochemical and Sr-Nd isotope constraints on the provenance of Permian deposits from Mozambique's Lower Karoo Zambezi Basineng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberUIDB/50019/2020
oaire.awardNumberPTDC/CTA-GEO/30082/2017
oaire.awardNumberLA/P/0069/2020
oaire.awardNumberUIDP/00350/2020
oaire.awardNumberUIDB/04035/2020
oaire.awardTitleInstituto Dom Luiz
oaire.awardTitlePermian-Triassic palaeoclimatic cycles of the Karoo Supergroup in Mozambique, and its implications on a changing world
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardTitleGeoBioSciences GeoTechnologies and GeoEngineering
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTA-GEO%2F30082%2F2017/PT
oaire.awardURIhttp://hdl.handle.net/10400.9/5686
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00350%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04035%2F2020/PT
oaire.citation.titleJournal of African Earth Sciences
oaire.citation.volume238
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
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oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameJorge
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person.familyNamePereira
person.familyNameLopes
person.givenNameRaul C. G. Santos
person.givenNamePaulo
person.givenNameZélia
person.givenNameGilda
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person.identifier.orcid0000-0003-3056-6219
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person.identifier.ridJ-6992-2013
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