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Pre-Mesoproterozoic crustal framework and Mesoproterozoic evolution of the SW Angolan Shield: structural, geochemical, and isotopic insights from the Kunene Complex and surrounding basement

2025-12Journal article Open access
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorMerino-Martínez, E.
dc.contributor.authorFerreira, Ezequiel
dc.contributor.authorValverde-Vaquero, Pablo
dc.contributor.authorRodrigues, José Feliciano
dc.contributor.authorEscuder-Viruete, Javier
dc.contributor.authorGarcia-Lobon, Jose Luis
dc.contributor.authorBeranoaguirre, Aratz
dc.contributor.authorFeria, María Carmen
dc.contributor.authorRey-Moral, Carmen
dc.contributor.authorSilva, Paulo Bravo
dc.contributor.authorGonzález-Cuadra, Pablo
dc.contributor.authorSousa, João Carlo
dc.contributor.authorPotti, Julián
dc.contributor.authorMáximo, J.
dc.contributor.authorGutiérrez-Medina, M.
dc.contributor.authorGumiel, J.C.
dc.contributor.authorGalán, Gustavo
dc.contributor.authorMochales, Tania
dc.contributor.authorManuel, José
dc.contributor.authorCordeiro, Domingos
dc.contributor.authorTassinari, Colombo C. G.
dc.contributor.authorMontero, P.
dc.contributor.authorSato, Kei
dc.contributor.authorFuenlabrada, José Manuel
dc.contributor.authorGalindo, Carmen
dc.date.accessioned2025-12-19T11:34:13Z
dc.date.available2025-12-19T11:34:13Z
dc.date.issued2025-12
dc.description.abstractABSTRACT: The southwestern Angolan Shield hosts the Earth's largest Mesoproterozoic massif-type anorthosite complex (up to 53,500 km(2)), the Kunene Complex (KC). This complex is the result of a long-lived (similar to 200 Ma) episodic emplacement of coalescent magmatic pulses. The recent acquisition of multidisciplinary data during the PLANAGEO project has significantly enhanced our understanding of the Precambrian crustal framework from the southwestern Angolan Shield. Combined multi-isotope, structural and geophysical data reveals distinctive crustal zones in the southwestern Angolan Shield that clearly influenced KC's emplacement within a back-arc setting. The spatio-temporal arrangement of KC pulses suggests westwards magma migration within a complex contractional regime involving large strike-slip systems. A long-lasting and extensive accretionary orogen was responsible for the tectono-thermal activity recorded during most of the Mesoproterozoic. Crustal thinning and partial melting of isotopically heterogeneous lower-crustal sources through mantle upwelling promoted the episodic felsic magmatism contemporaneous with the KC. Crustal contamination processes are evident in gabbroanorthosites, indicating mantle metasomatism and interaction with wall-rocks and granite melts during ascent, upwelled by lateral-driven forces. Deposition of extensive metasedimentary sequences (<1.26 Ga) covering the KC, along with 1.23-1.07 Ga sublithospheric and mantle-derived magmatism, indicate a shift from a compressional to an extensional regime during late-Mesoproterozoic times. Regional correlations with other Mesoproterozoic units in African and Brazilian counterparts suggest a shared geological evolution, despite potential differences in tectonic setting. These findings supports a refined geological model for the Mesoproterozoic evolution of the southwestern part of the Congo Craton.eng
dc.identifier.citationMerino-Martinez, E., Ferreira, E., Valverde-Vaquero, P., Rodrigues, J. F., Escuder-Viruete, J., Garcia-Lobon, J. L., Beranoaguirre, A., Feria, M. C., Rey-Moral, C., Silva, P. B., Gonzalez-Cuadra, P., Souza, J. C., Potti, J., Maximo, J., Gutierrez-Medina, M., Gumiel, J. C., Galan, G., Mochales, T., Manuel, J., Cordeiro, D., Tassinari, C., Montero, P., Sato, K., Fuenlabrada, J. M., & Galindo, C. (2025). Pre-Mesoproterozoic crustal framework and Mesoproterozoic evolution of the SW Angolan Shield: structural, geochemical, and isotopic insights from the Kunene Complex and surrounding basement. In: Precambrian Research, 2025, vol. 431, article 107937. https://doi.org/10.1016/j.precamres.2025.107937
dc.identifier.doi10.1016/j.precamres.2025.107937
dc.identifier.eissn1872-7433
dc.identifier.issn0301-9268
dc.identifier.urihttp://hdl.handle.net/10400.9/6182
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0301926825002633?pes=vor&utm_source=clarivate&getft_integrator=clarivate
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectGeology
dc.subjectU-Pb geochronology
dc.subjectMesoproterozoic igneous
dc.subjectPalaeoproterozoic
dc.subjectGeochemistry
dc.subjectKunene complex
dc.subjectAngola (Southwest)
dc.titlePre-Mesoproterozoic crustal framework and Mesoproterozoic evolution of the SW Angolan Shield: structural, geochemical, and isotopic insights from the Kunene Complex and surrounding basementeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titlePrecambrian Research
oaire.citation.volume431
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameValverde-Vaquero
person.familyNameRodrigues
person.familyNameBeranoaguirre
person.givenNamePablo
person.givenNameJosé Feliciano
person.givenNameAratz
person.identifier.orcid0000-0002-2184-0848
person.identifier.orcid0000-0001-8246-9379
person.identifier.orcid0000-0002-1137-6498
person.identifier.ridM-3394-2014
person.identifier.scopus-author-id55911124900
person.identifier.scopus-author-id54986215400
relation.isAuthorOfPublication46190466-57cf-440e-beda-9e8cf79582d5
relation.isAuthorOfPublication8a316992-104c-4157-af2e-3981eabe75ff
relation.isAuthorOfPublicationc8545eb3-3fef-4478-9a95-b08256d6ebbf
relation.isAuthorOfPublication.latestForDiscovery46190466-57cf-440e-beda-9e8cf79582d5

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