Zircon U-Pb and Lu-Hf Constraints on the Paleo- to Mesoproterozoic Evolution of the Southwest Angolan Shield (Congo Craton) [Resumo]

ABSTRACT: 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 determine the age and provenance of extensive sedimentary strata in southwest Angola, and use them as a proxy for the Paleoproterozoic to Mesoproterozoic evolution of the southwest AS. Mesoproterozoic maximum depositional ages between 1334 ± 8 Ma and 1184 ± 23 Ma for the Iona, Cahama, and Ompupa siliciclastic rocks refute previous correlations with the Paleoproterozoic Chela Group. Detrital zircon U-Pb and Lu-Hf isotopes closely match those of magmatic rocks from the southwest AS, indicating that Mesoproterozoic siliciclastic rocks were primarily derived from the AS.

Palavras-chave

U-Pb geochronology Zircon Mesoproterozoic igneous Crustal evolution Angola (Southwest)

URI

http://hdl.handle.net/10400.9/6258

Citação

Ferreira, 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. (2025). Zircon U-Pb and Lu-Hf Constraints on the Paleo-to Mesoproterozoic Evolution of the Southwest Angolan Shield (Congo Craton). In: Goldschmidt2025 - International Conference on Geochemistry, Abstract 28232, Prague, Czech Republic, 6-11 July, 2025. https://doi.org/10.7185/gold2025.28232

Editora

Geochemical Society

DOI

10.7185/gold2025.28232

Coleções

CTM - Resumos em livros de actas

Licença CC

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