Skip to Main content Skip to Navigation
Journal articles

Cosmogenic and Geological Evidence for the Occurrence of a Ma-Long Feedback between Uplift and Denudation, Chur Region, Swiss Alps

Abstract : We used concentrations of in situ cosmogenic 10Be from riverine sediment to quantify the basin-averaged denudation rates and sediment fluxes in the Plessur Basin, Eastern Swiss Alps, which is a tributary stream to the Alpine Rhine, one of the largest streams in Europe. We complement the cosmogenic dataset with the results of morphometric analyses, geomorphic mapping, and sediment fingerprinting techniques. The results reveal that the Plessur Basin is still adjusting to the landscape perturbation caused by the glacial carving during the Last Glacial Maximum c. 20,000 years ago. This adjustment has been most efficient in the downstream part where the bedrock comprises high erodibility North Penninic flysch and Bündnerschist, whereas glacial landforms are still prominently preserved in the upstream region, comprising low erodibility South Penninic and Austroalpine bedrock. This geomorphic observation is supported by the 10Be based denudation rate and sediment provenance analysis, which indicate a much faster sediment production in the flysch and schist lithologies. Interestingly, the reach of fast denudation has experienced the highest exhumation and rock uplift rates. This suggests that lithologic and glacial conditioning have substantially contributed to the local uplift and denudation as some of the driving forces of a positive feedback system.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03335299
Contributor : Romain Delunel Connect in order to contact the contributor
Submitted on : Monday, September 6, 2021 - 10:25:40 AM
Last modification on : Friday, April 1, 2022 - 3:50:35 AM

Links full text

Identifiers

Citation

Ewerton da Silva Guimarães, Romain Delunel, Fritz Schlunegger, Naki Akçar, Laura Stutenbecker, et al.. Cosmogenic and Geological Evidence for the Occurrence of a Ma-Long Feedback between Uplift and Denudation, Chur Region, Swiss Alps. Geosciences, Geological Survey of Iran, 2021, 11 (8), pp.339. ⟨10.3390/geosciences11080339⟩. ⟨hal-03335299⟩

Share

Metrics

Record views

26