Rapid post-glacial bedrock weathering in coastal Norway

Andersen, Jane Lund; Margreth, Annina; Fredin, Ola; Linge, Henriette; Goodfellow, Bradley W.; Faust, Johan C.; Knies, Jochen; Solbakk, Terje; Brook, Edward J.; Scheiber, Thomas; van der Lelij, Roelant; Burki, Valentin; Rubensdotter, Lena; Himmler, Tobias; Yeşilyurt, Serdar; Christl, Marcus; Vockenhuber, Christof; Akçar, Naki (2022). Rapid post-glacial bedrock weathering in coastal Norway. Geomorphology, 397, p. 108003. Elsevier Science 10.1016/j.geomorph.2021.108003

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Quantifying bedrock weathering rates under diverse climate conditions is essential to understanding timescales of landscape evolution. Yet, weathering rates are often difficult to constrain, and associating a weathered landform to a specific formative environment can be complicated by overprinting of successive processes and temporally varying climate. In this study, we investigate three sites between 59°N and 69°N along the Norwegian coast that display grussic saprolite, tafoni, and linear weathering grooves on diverse lithologies. These weathering phenomena have been invoked as examples of geomorphic archives predating Quaternary glaciations and consequently as indicators of minimal glacial erosion. Here we apply cosmogenic nuclide chronometry to assess the recent erosional history. Our results demonstrate that all three sites experienced sufficient erosion to remove most cosmogenic nuclides formed prior to the Last Glacial Maximum. This finding is inconsistent with preservation of surficial (<1–2 m) weathered landforms under non-erosive ice during the last glacial period, while simultaneously demonstrating that post-glacial weathering and erosion rates can be locally rapid (4–10 cm kyr−1) in cold temperate to subarctic coastal locations.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Akçar, Naki

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0169-555X

Publisher:

Elsevier Science

Language:

English

Submitter:

Naki Akçar

Date Deposited:

30 Mar 2022 14:24

Last Modified:

03 Apr 2022 01:55

Publisher DOI:

10.1016/j.geomorph.2021.108003

BORIS DOI:

10.48350/166696

URI:

https://boris.unibe.ch/id/eprint/166696

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