Uagoda R. auteur aut IRD Siame L. L. auteur aut IRD Garnier J. auteur aut IRD Leanni Laetitia auteur aut IRD Caldeira D. auteur aut IRD Braucher R. auteur aut IRD Freydier R. auteur aut IRD Seyler Patrick auteur aut IRD text journalArticle eng text/pdf born digital access Tropical karst landscapes are marked by complex sediment dynamics resulting from the interplay between geomorphic processes and sediment transport. In the Vermelho Watershed (Brazilian savanna), we use paired cosmogenic nuclides (10Be and 26Al) to quantify denudation rates, burial durations, and sediment mixing. The spatial distribution of Al-Be ratios reveals rapid erosion and prolonged burial on escarpments, in contrast to the more stable conditions of flatter areas, where erosion is subdued, and sediment residence time is longer. Comparisons with Iraquara and Serra das Mesas emphasize the influence of topography and sediment sources on nuclide inventories. Downstream increases in freshly eroded material point to fluvial mixing, while discrepancies between cosmogenic burial and OSL ages (Tarimba Cave) suggest partial burial and pre-depositional histories. The integration of cosmogenic, geochemical, and geomorphic data underscores the complexity of tropical karst systems, where vertical mixing and uneven erosion are key processes. These results contribute to a broader understanding of landscape evolution and offer a comparative basis for interpreting cosmogenic signals in fluviokarst environments worldwide. specialized Cosmogenic nuclides Fluvio-karst systems Sediment dynamics BRESIL 064 021 482 109794 [16 p.] 2025 0169-555X https://www.documentation.ird.fr/hor/fdi:010093510 10.1016/j.geomorph.2025.109794 0169-555X [F B010093510] https://www.documentation.ird.fr/hor/fdi:010093510 https://www.documentation.ird.fr/intranet/publi/2025-06/010093510.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2025-06-11 2025-11-04 fdi:010093510 fre