Towards the steady state? A long-term river incision deceleration pattern during Pleistocene entrenchment (Upper Ebro River, Northern Spain)

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dc.contributor.authorBenito-Calvo, Aen_AU
dc.contributor.authorMoreno, Den_AU
dc.contributor.authorFujioka, Ten_AU
dc.contributor.authorLópez, GIen_AU
dc.contributor.authorMartín-González, Fen_AU
dc.contributor.authorHernando-Alonso, Ien_AU
dc.contributor.authorKarampaglidis, Ten_AU
dc.contributor.authorBermúdez de Castro, JMen_AU
dc.contributor.authorGutiérrez, Fen_AU
dc.date.accessioned2023-11-27T01:24:07Zen_AU
dc.date.available2023-11-27T01:24:07Zen_AU
dc.date.issued2022-06en_AU
dc.date.statistics2022-05-26en_AU
dc.description.abstractPleistocene fluvial incision acceleration resulting in narrow and deeply entrenched valleys has been widely described and is generally attributed to uplift rate increase or greater climatic severity. In this paper, the long-term downcutting pattern of the Upper Ebro River and driving mechanisms are assessed, and we reconstruct the valley incision recorded by an outstanding sequence of 22 river terraces. Dating of 8 fluvial levels by means of the ESR, TCN, and OSL techniques, spanning the last 1.2 Ma, reveals a long-term incision deceleration pattern. The estimated age-incision model indicates a decrease in the incision rates, showing a long-term deceleration during the final Early Pleistocene (from 0.42 to 0.18 m/ka), and a tendency towards a steady state or base level stabilization from the Middle Pleistocene (0.15–0.03 m/ka) to the Late Pleistocene (0.03 m/ka). This incision pattern does not support climate change as a long-term incision-acceleration driver by itself, demonstrating the need for base level lowering effects to have operated. Upper Ebro deceleration incision is explained by the headward attenuation of the incision wave induced by the opening of the Ebro Cenozoic Basin in a geodynamic context characterized by an absence of significant uplift over the last million years. This trend could have changed the aggressor-victim roles of the rivers involved in fluvial captures at the drainage divide. The documented incision deceleration pattern differs from that reported for other valleys in the Iberian Peninsula, suggesting that the degree of maturity of the fluvial systems depends on their relative position with respect to the capture point, in addition to tectonic and lithostructural factors. In the Late Pleistocene-Holocene, a short-lived incision rate increase is recorded, corresponding to the last terrace dissection phase, during the transition from the last glacial MIS 2 to the interglacial MIS 1. © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND licenceen_AU
dc.description.sponsorshipThis research was supported by research projects CEN001B10–2 (Junta de Castilla y León), PGC2018-093925-B-C31 (Ministerio de Economía, Industria y Competitividad, Gobierno de España), and CGL2017-85045-P (Ministerio de Ciencia e Innovación, Gobierno de España). Digital mapping was carried out using the equipment available at the Digital Mapping and 3D Analysis Laboratory of the CENIEH (Centro Nacional de Investigación sobre la Evolución Humana). ESR and OSL geochronological analyses were conducted in the Geochronology laboratories of the CENIEH. We would like to thank the technicians of the ESR and OSL laboratories (Mª Jesús Alonso, Miren del Val, David Martínez, and Oswaldo Guzmán) for their work on the preparation of samples. We acknowledge the financial support from the Australian National Collaborative Research Infrastructure Strategy (NCRIS) program for the Centre for Accelerator Science at ANSTO, where TCN analysis was carried out. The authors are very grateful to Kathryn Hanson for her useful comments and improvements. They also thank Dr. M. Stokes and 3 anonymous reviewers for their detailed revision and useful comments.en_AU
dc.identifier.articlenumber103813en_AU
dc.identifier.citationBenito-Calvo, A., Moreno, D., Fujioka, T., López, G. I., Martín-González, F., Martínez-Fernández, A., & Gutiérrez, F. (2022). Towards the steady state? A long-term river incision deceleration pattern during Pleistocene entrenchment (Upper Ebro River, Northern Spain). Global and Planetary Change, 213, 103813. doi:10.1016/j.gloplacha.2022.103813en_AU
dc.identifier.issn0921-8181en_AU
dc.identifier.journaltitleGlobal and Planetary Changeen_AU
dc.identifier.urihttps://doi.org/10.1016/j.gloplacha.2022.103813en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15244en_AU
dc.identifier.volume213en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.relation.urihttps://doi.org/10.1016/j.gloplacha.2022.103813en_AU
dc.subjectAge estimationen_AU
dc.subjectAccelerationen_AU
dc.subjectPleistocene epochen_AU
dc.subjectRiversen_AU
dc.subjectClimatesen_AU
dc.subjectClimatic changeen_AU
dc.subjectDrainageen_AU
dc.titleTowards the steady state? A long-term river incision deceleration pattern during Pleistocene entrenchment (Upper Ebro River, Northern Spain)en_AU
dc.typeJournal Articleen_AU
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