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

[EN] 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 in...

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Authors: Ferreira, Ezequiel, Lehmann, Jérémie, Rodrigues, José Feliciano, Hayes, Ben, Merino, Enrique, Milani, Lorenzo, Bybee, Grant M., Owen‑Smith, Trishya M., García Lobón, José Luis, Tassinari, Colombo Celso Gaeta, Ueckermann, Henriette, Sato, Kei, Silva, Paulo Bravo, Correia, João, Labaredas, José, Duarte, Laurent, Molekwa, Mmasetena Anna, Manuel, Jose, Victorino, Américo da Mata Lourenço
Format: article
Status:Published version
Publication Date:2024
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/367386
Online Access:http://hdl.handle.net/10261/367386
https://api.elsevier.com/content/abstract/scopus_id/85189808152
Access Level:Open access
Keyword:U-Pb and Lu-Hf isotopes
Archean to Mesoproterozoic
Crustal evolution
Detrital and igneous zircon
SW Angolan Shield
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spelling Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)Ferreira, EzequielLehmann, JérémieRodrigues, José FelicianoHayes, BenMerino, EnriqueMilani, LorenzoBybee, Grant M.Owen‑Smith, Trishya M.García Lobón, José LuisTassinari, Colombo Celso GaetaUeckermann, HenrietteSato, KeiSilva, Paulo BravoCorreia, JoãoLabaredas, JoséDuarte, LaurentMolekwa, Mmasetena AnnaManuel, JoseVictorino, Américo da Mata LourençoU-Pb and Lu-Hf isotopesArchean to MesoproterozoicCrustal evolutionDetrital and igneous zirconSW Angolan Shield[EN] 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 εHf(i) and εNd(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 εHf(i) values indicating significant juvenile addition. The Kunene Complex (KC: ∼1.50–1.36 Ga) anorthosite-mangerite-charnockite-granite magmatism displays variable εHf(i) and εNd(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.Ferreira's research visit to the University of Johannesburg and the analysis of sedimentary samples were funded by the PPM Research Group (University of Johannesburg). Funding for the analysis of igneous samples was provided by the PLANAGEO program.Peer reviewedElsevierUniversity of JohannesburgFerreira, Ezequiel [0000-0002-3095-2745]Lehmann, Jérémie [0000-0001-9079-629X]Hayes, Ben [0000-0003-0189-9137]Milani, Lorenzo [0000-0002-0612-9126]Bybee, Grant M. [0000-0002-3156-551X]Ueckermann, Henriette [0000-0003-1463-4031]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/367386https://api.elsevier.com/content/abstract/scopus_id/85189808152reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.gr.2024.03.010Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3673862026-05-22T06:33:51Z
dc.title.none.fl_str_mv Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
title Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
spellingShingle Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
Ferreira, Ezequiel
U-Pb and Lu-Hf isotopes
Archean to Mesoproterozoic
Crustal evolution
Detrital and igneous zircon
SW Angolan Shield
title_short Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
title_full Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
title_fullStr Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
title_full_unstemmed Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
title_sort Zircon U-Pb and Lu-Hf isotopes reveal the crustal evolution of the SW Angolan Shield (Congo Craton)
dc.creator.none.fl_str_mv Ferreira, Ezequiel
Lehmann, Jérémie
Rodrigues, José Feliciano
Hayes, Ben
Merino, Enrique
Milani, Lorenzo
Bybee, Grant M.
Owen‑Smith, Trishya M.
García Lobón, José Luis
Tassinari, Colombo Celso Gaeta
Ueckermann, Henriette
Sato, Kei
Silva, Paulo Bravo
Correia, João
Labaredas, José
Duarte, Laurent
Molekwa, Mmasetena Anna
Manuel, Jose
Victorino, Américo da Mata Lourenço
author Ferreira, Ezequiel
author_facet Ferreira, Ezequiel
Lehmann, Jérémie
Rodrigues, José Feliciano
Hayes, Ben
Merino, Enrique
Milani, Lorenzo
Bybee, Grant M.
Owen‑Smith, Trishya M.
García Lobón, José Luis
Tassinari, Colombo Celso Gaeta
Ueckermann, Henriette
Sato, Kei
Silva, Paulo Bravo
Correia, João
Labaredas, José
Duarte, Laurent
Molekwa, Mmasetena Anna
Manuel, Jose
Victorino, Américo da Mata Lourenço
author_role author
author2 Lehmann, Jérémie
Rodrigues, José Feliciano
Hayes, Ben
Merino, Enrique
Milani, Lorenzo
Bybee, Grant M.
Owen‑Smith, Trishya M.
García Lobón, José Luis
Tassinari, Colombo Celso Gaeta
Ueckermann, Henriette
Sato, Kei
Silva, Paulo Bravo
Correia, João
Labaredas, José
Duarte, Laurent
Molekwa, Mmasetena Anna
Manuel, Jose
Victorino, Américo da Mata Lourenço
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv University of Johannesburg
Ferreira, Ezequiel [0000-0002-3095-2745]
Lehmann, Jérémie [0000-0001-9079-629X]
Hayes, Ben [0000-0003-0189-9137]
Milani, Lorenzo [0000-0002-0612-9126]
Bybee, Grant M. [0000-0002-3156-551X]
Ueckermann, Henriette [0000-0003-1463-4031]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv U-Pb and Lu-Hf isotopes
Archean to Mesoproterozoic
Crustal evolution
Detrital and igneous zircon
SW Angolan Shield
topic U-Pb and Lu-Hf isotopes
Archean to Mesoproterozoic
Crustal evolution
Detrital and igneous zircon
SW Angolan Shield
description [EN] 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 εHf(i) and εNd(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 εHf(i) values indicating significant juvenile addition. The Kunene Complex (KC: ∼1.50–1.36 Ga) anorthosite-mangerite-charnockite-granite magmatism displays variable εHf(i) and εNd(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.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/367386
https://api.elsevier.com/content/abstract/scopus_id/85189808152
url http://hdl.handle.net/10261/367386
https://api.elsevier.com/content/abstract/scopus_id/85189808152
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.gr.2024.03.010
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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