Rodriguez-Rodriguez L. auteur aut IRD Anton L. auteur aut IRD Rodes A. auteur aut IRD Pallas R. auteur aut IRD Garcia-Castellanos D. auteur aut IRD Jimenez-Munt I. auteur aut IRD Struth L. auteur aut IRD Leanni Laetitia auteur aut IRD Aumaitre G. auteur aut IRD Bourles D. auteur aut IRD Keddadouche K. auteur aut IRD ASTER Team auteur aut IRD text journalArticle eng text/pdf born digital access Fluvial terraces are valuable records to study and characterize landscape evolution and river response to base level lowering, and to decipher coupled responses between fluvial incision and regional tectonics. The opening of closed basins has a strong impact on fluvial dynamics, as it involves an abrupt base level lowering that accelerates landscape fluvial dissection. This study focuses on the time response of the Duero Basin, the largest and best preserved among the Cenozoic basins of the Iberian Peninsula, to exorheism. Fluvial incision due to basin opening has developed up to 13 un-paired strath terraces along the south margin of the Duero river, distributed at relative heights up to + 136-128 m compared to the modern floodplain. Paired Be-10-Al-26 cosmogenic isotope depth profiles from six fluvial terraces, located ca. 30-80 km upstream from the opening zone, suggest Pleistocene ages for almost the entire fluvial terrace staircase (from T3 at +112 -107 m, to T12 at + 13-11 m). The terrace density and the total lowering of the terrace surface, key parameters in limiting terrace exposure ages, were estimated based on field and geomorphological data. Apparent burial durations and basin denudation rates deduced from inherited Be-10-Al-26 concentrations provide valuable information on basin evolution. Apparent basin denudation rates remained relatively low (< 3-6 m.Ma(-1)) during the Pliocene, and doubled (8-13 m.Ma(-1)) during the Early Pleistocene (ca. 2-1 Ma) possibly showing a lower proportion of recycled sediments. Time averaged incision rates deduced from terraces in the study area and along some tributaries show that incision rates are higher close to the opening site (122- < 250 m.Ma(-1)) than towards the upstream part of the catchment (88-68 m.Ma(-1)), evidencing the retrogressive travel of the erosive wave nucleated at the opening site. specialized Fluvial terrace endo-exorheic transition Cosmogenic depth-profile dating Landscape evolution Denudation rate Incision rates ESPAGNE PORTUGAL DUERO COURS D'EAU 064 062 193 103271 [18p.] 2020 0921-8181 https://www.documentation.ird.fr/hor/fdi:010079847 10.1016/j.gloplacha.2020.103271 0921-8181 [F B010079847] https://www.documentation.ird.fr/hor/fdi:010079847 https://www.documentation.ird.fr/intranet/publi/2020/11/010079847.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2020-12-08 2025-02-24 fdi:010079847 fre