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Article

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

1
Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, 3012 Bern, Switzerland
2
Department of Earth Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
3
French National Centre for Scientific Research (CNRS), UMR 5600 EVS/IRG-Lyon 2, 69676 Bron, France
4
Institute of Applied Geosciences, Technical University of Darmstadt, Karolinenplatz 5, 64289 Darmstadt, Germany
5
Laboratory of Ion Beam Physics, Swiss Federal Institute of Technology Zurich (ETHZ), Otto-Stern-Weg 5, 8093 Zurich, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editors: Ángel Rodés and Jesus Martinez-Frias
Geosciences 2021, 11(8), 339; https://doi.org/10.3390/geosciences11080339
Received: 9 June 2021 / Revised: 19 July 2021 / Accepted: 27 July 2021 / Published: 12 August 2021
(This article belongs to the Special Issue Cutting Edge Earth Sciences: Three Decades of Cosmogenic Nuclides)
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. View Full-Text
Keywords: cosmogenic nuclides; sediment fingerprinting; geomorphometric analysis; positive feedback; Prättigau half-window cosmogenic nuclides; sediment fingerprinting; geomorphometric analysis; positive feedback; Prättigau half-window
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MDPI and ACS Style

da Silva Guimarães, E.; Delunel, R.; Schlunegger, F.; Akçar, N.; Stutenbecker, L.; Christl, M. Cosmogenic and Geological Evidence for the Occurrence of a Ma-Long Feedback between Uplift and Denudation, Chur Region, Swiss Alps. Geosciences 2021, 11, 339. https://doi.org/10.3390/geosciences11080339

AMA Style

da Silva Guimarães E, Delunel R, Schlunegger F, Akçar N, Stutenbecker L, Christl M. Cosmogenic and Geological Evidence for the Occurrence of a Ma-Long Feedback between Uplift and Denudation, Chur Region, Swiss Alps. Geosciences. 2021; 11(8):339. https://doi.org/10.3390/geosciences11080339

Chicago/Turabian Style

da Silva Guimarães, Ewerton, Romain Delunel, Fritz Schlunegger, Naki Akçar, Laura Stutenbecker, and Marcus Christl. 2021. "Cosmogenic and Geological Evidence for the Occurrence of a Ma-Long Feedback between Uplift and Denudation, Chur Region, Swiss Alps" Geosciences 11, no. 8: 339. https://doi.org/10.3390/geosciences11080339

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