Incision rate of the Yellow River in Northeastern Tibet constrained by 10Be and 26Al cosmogenic isotope dating of fluvial terraces: implications for catchment evolution and plateau building - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue Special Publication - Geological Society of London Année : 2011

Incision rate of the Yellow River in Northeastern Tibet constrained by 10Be and 26Al cosmogenic isotope dating of fluvial terraces: implications for catchment evolution and plateau building

Résumé

Unlike other large rivers flowing out of Tibet, the Yellow River escapes from the plateau towards the NE crossing no less than five NW-SE striking, actively growing ranges and intervening basins. Thick Plio-Quaternary deposits and fluvial terraces testify to a phase of aggra- dation and sediment infill up to the average surface elevation (3200 - 3250 m a.s.l.) of the Gonghe, Guide and Qinghai Lake basins. A set of seven main terraces across the Gonghe Basin suggests progressive down-cutting of the Yellow River carving the 500 m deep Longyang gorge at the basin exit. 10Be and 26Al concentrations in quartz of surface and sub-surface samples of four terraces constrain the timing of incision by determining the burial age of the deposit and the exposure age of its surface. Modelling the depth dependence of the 10Be concentration and the 26Al/10Be ratio allows us to constrain the onset of the ongoing phase of incision to 120-250 ka. These ages suggest long-term incision rates between 2-6 mm/a. Together with the present morphology of the Yellow River terraces across the Gonghe basin and the Longyang gorge, our results imply rapid river catchment evolution and interaction between river dynamics, tectonic and climate in northeastern Tibet.
Fichier principal
Vignette du fichier
Perrineauetal_GSLsp_2010-accepted-JvdW.pdf (3.66 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00684003 , version 1 (30-03-2012)

Identifiants

Citer

Aude Perrineau, Jerome van Der Woerd, Yves Gaudemer, Jing Liu-Zeng, Raphaël Pik, et al.. Incision rate of the Yellow River in Northeastern Tibet constrained by 10Be and 26Al cosmogenic isotope dating of fluvial terraces: implications for catchment evolution and plateau building. Special Publication - Geological Society of London, 2011, 353, pp.189-219. ⟨10.1144/SP353.10⟩. ⟨hal-00684003⟩
348 Consultations
688 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More