Namibe Group detrital zircon U-Pb and Lu-Hf isotopes: a testimony of late-Orosirian (1.9–1.8 Ga) crustal growth in the Angolan Shield (Congo Craton)

ABSTRACT: The Namibe Group represents the largest package of immature supracrustal rocks of the Angola Shield (Congo Craton), occupying an area of nearly 10,000 km2 in the Namibe Zone (NZ). It is a folded, steeply dipping, meta-volcanosedimentary sequence essentially comprising immature micaschists and greywackes, felsic metavolcaniclastites, along with intercalated marbles and amphibolites. The metavolcanosedimentary sequence is intruded by ca. 1810–1790 Ma ultramafic to felsic plutonic rocks with magmatic arc geochemical signatures. Despite its importance, key aspects such as its maximum depositional age (MDA), sedimentary provenance, and the detrital zircon (DZ) record of crustal evolution remain unresolved. This study presents LA-ICP-MS U-Pb and Lu-Hf DZ analyses from nine NG samples.

Palavras-chave

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

URI

http://hdl.handle.net/10400.9/6257

Citação

Ferreira, E., Lehmann, J., Rodrigues, J.F., Silva, P., Smith, T., García-Lobón, J.L., Correia, J., Ueckermann, H., Molekwa, M.A., Manuel, J., & Victorino, A.D.L. (2026). Namibe Group detrital zircon U-Pb and Lu-Hf isotopes: a testimony of late-Orosirian (1.9–1.8 Ga) crustal growth in the Angolan Shield (Congo Craton). In: EGU General Assembly 2025, vol. EGU25-18911, Vienna, Austria, 27 April - 2 May, 2025. https://doi.org/10.5194/egusphere-egu25-18911

Editora

European Geosciences Union

DOI

10.5194/egusphere-egu25-18911

Coleções

CTM - Resumos em livros de actas

Licença CC

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