Repository logo
 
Publication

Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)

2024-07Journal article Open access
Simple item page
dc.contributor.authorFerreira, Ezequiel
dc.contributor.authorLehmann, Jeremie
dc.contributor.authorRodrigues, José Feliciano
dc.contributor.authorHayes, Ben
dc.contributor.authorMerino-Martinez, Enrique
dc.contributor.authorMilani, Lorenzo
dc.contributor.authorBybee, Grant M.
dc.contributor.authorSmith, Trishya M. Owen
dc.contributor.authorGarcía-Lobón, J. L.
dc.contributor.authorTassinari, Colombo C. G.
dc.contributor.authorUeckermann, Henriette
dc.contributor.authorSato, Kei
dc.contributor.authorSilva, Paulo Bravo
dc.contributor.authorCorreia, João
dc.contributor.authorLabaredas, José
dc.contributor.authorDuarte, Laurent
dc.contributor.authorMolekwa, Mmasetena Anna
dc.contributor.authorManuel, José
dc.contributor.authorVictorino, Américo da Mata
dc.date.accessioned2024-08-07T10:02:08Z
dc.date.available2024-08-07T10:02:08Z
dc.date.issued2024-07
dc.description.abstractABSTRACT: The crustal evolution of the Angolan Shield (AS) remains poorly constrained. To address this, we analysed U-Pb and Lu-Hf isotopes in detrital and igneous zircons to investigate the age and provenance of extensive sedimentary strata in southwestern Angola and use it as a proxy to gain insight into the Archean to Mesoproterozoic evolution of the region. Mesoproterozoic maximum depositional ages for the Iona (<1323 +/- 13 Ma), Ompupa (<1215 +/- 13 Ma), and Cahama (<1184 +/- 23 Ma) siliciclastics challenge previous correlations with the Paleoproterozoic Chela Group. Provenance analysis reveals that the Mesoproterozoic strata were derived internally from the AS. Our combined dataset indicates that the widespread Eburnean magmatism (-2.05-1.93 Ga) resulted from reworking of Archean crust, possibly in collision orogens. A major increase in the eHf(i) and eNd(i) values at - 1.87-1.73 Ga indicates a change in geodynamics, with magmatism of the Epupa-Namibe Metamorphic Complex (ENMC) generated in an extensional accretionary orogen at the southern margin of the Eburnean-Archean crustal block. Magmatism resumed in the Mesoproterozoic (-1.56-1.50 Ga), with suprachondritic eHf(i) values indicating significant juvenile addition. The Kunene Complex (KC: -1.50-1.36 Ga) anorthosite-mangerite-charnockite-granite magmatism displays variable eHf(i) and eNd(i) values, consistent with mixing between reworked ENMC-crust and juvenile melts in a long-lived accretionary orogen back-arc region. Post-KC (-1.36-1.30 Ga) magmatism shows an increased juvenile contribution, potentially linked to partial melting of ENMC and - 1.56-1.50 Ga juvenile crust during an orogenic event, or alternatively, related to renewed slab retreat and back-arc extension. The Hf isotopic compositions of - 1.29-1.18 Ga zircons are compatible with a renewed input from the depleted mantle and/or reworking of the earlier - 1.56-1.50 Ga juvenile crust. Emplacement of - 1.13-1.10 Ga mafic dikes/sills marks the end of Mesoproterozoic magmatism in the AS. Our new data enhance our understanding of the Archean to Mesoproterozoic crustal evolution of the AS.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFerreira, E., Lehmann, J., Rodrigues, J.F., Hayes, B., Merino-Martinez, E., Milani, L., Bybee, G.M., Smith, T.M.O., García-Lobón, J.L., Tassinari, C.C.G., Ueckermann, H., Sato, K., Silva, P.B., Correia, J ., Labaredas, J., Duarte, L., Molekwa, M.A., Manuel, J. & Victorino, A.D.L. (2024) Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton). In: Gondwana Research, 2024, vol. 131, p. 317-342. https://doi.org/10.1016/j.gr.2024.03.010pt_PT
dc.identifier.doi10.1016/j.gr.2024.03.010pt_PT
dc.identifier.eissn1878-0571
dc.identifier.issn1342-937X
dc.identifier.urihttp://hdl.handle.net/10400.9/4322
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://doi.org/10.1016/j.gr.2024.03.010pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectAngola (Southwest)pt_PT
dc.subjectMesoproterozoic igneouspt_PT
dc.subjectZirconpt_PT
dc.subjectU-Pb geochronologypt_PT
dc.subjectCrustal evolutionpt_PT
dc.titleZircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage342pt_PT
oaire.citation.startPage317pt_PT
oaire.citation.titleGondwana Researchpt_PT
oaire.citation.volume131pt_PT
person.familyNameRodrigues
person.givenNameJosé Feliciano
person.identifier.orcid0000-0001-8246-9379
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication8a316992-104c-4157-af2e-3981eabe75ff
relation.isAuthorOfPublication.latestForDiscovery8a316992-104c-4157-af2e-3981eabe75ff

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
GondwanaResearch_vol.131_317-342.pdf
Size:
11.08 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

CTM - Artigos em revistas internacionais