Pre-Mesoproterozoic crustal architecture and implications for the Mesoproterozoic evolution of the SW Angolan Shield from structural, geochemical, and isotopic evidence [Resumo]

ABSTRACT: Several studies suggest the existence of multiple tectonic domains within the Angolan Shield [1], yet the Archaean to Palaeoproterozoic basement of SW Angola and NW Namibia remains largely unexplored. Similarly, distinct Mesoproterozoic (1534–1065 Ma) igneous suites are documented in the SW Angolan Shield, including the largest known gabbro-anorthosite complex (~42,500 km²), the Kunene Complex (KC), but the geological evolution of the region during the Mesoproterozoic is still debated. Traditionally linked to anorogenic contexts [2], recent studies propose a collisional setting for the KC [3]. A combined isotopic (U-Pb, Sr-Nd), gravimetric, and structural approach allows for a refined crustal framework of the SW Angolan Shield and provides new insights into the emplacement of the KC and the regional evolution of the southern Congo Craton. This integrated dataset delineates several Archaean to Palaeoproterozoic domains surrounding the KC, featured by a specific gravimetric response and geochronological time span: Cassinga Zone (2667–2568 Ma and 1982–1971 Ma), Central Eburnean Zone (2038–1947 Ma; intruded by 1844–1744 Ma magmatism in its southern region, the Lubango Area), Namibe and Epupa Zones (1861–1739 Ma), and the Kalahari Area (~1775 Ma?). These contrasting crustal domains significantly influenced the genesis and emplacement of the KC.

Palavras-chave

Geology U-Pb geochronology Mesoproterozoic igneous Palaeoproterozoic Geochemistry Kunene complex Angola (Southwest)

URI

http://hdl.handle.net/10400.9/6259

Citação

Merino-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 architecture and implications for the Mesoproterozoic evolution of the SW Angolan Shield from structural, geochemical, and isotopic evidence. In: Goldschmidt2025 - International Conference on Geochemistry, Abstract 31707, Prague, Czech Republic, 6-11 July, 2025. https://doi.org/10.7185/gold2025.31707

Editora

Geochemical Society

DOI

10.7185/gold2025.31707

Coleções

CTM - Resumos em livros de actas

Licença CC

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