Bandou, D.; Schlunegger, F.; Kissling, E.; Marti, U.; Schwenk, M.; Schläfli, P.; Douillet, G.; Mair, D. (2022). Three-dimensional gravity modelling of a Quaternary overdeepening fill in the Bern area of Switzerland discloses two stages of glacial carving. Scientific reports, 12(1), p. 1441. Springer Nature 10.1038/s41598-022-04830-x
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The geometry of glacial overdeepenings on the Swiss Plateau close to Bern was inferred through a combination of gravity data with a 3D gravity modelling software. The target overdeepenings have depths between 155 and > 270 m and widths between 860 and 2400 m. The models show incisions characterized by U‐shaped cross‐sectional geometries and steep to over‐steepened lateral anks. Existing stratigraphic data reveals that the overdeepenings were formed and then lled during at least two glacial stages, which occurred during the Last Glacial Maximum (LGM) within the Marine Isotope Stage (MIS) 2, and possibly MIS 6 or before. The U‐shaped cross‐sectional geometries point towards glacial erosion as the main driver for the shaping of the overdeepenings. The combination
of the geometries with stratigraphic data suggests that the MIS 6 (or older) glaciers deeply carved the bedrock, whereas the LGM ice sheet only widened the existing valleys but did not further deepen them. We relate this pattern to the di erent ice thicknesses, where a thicker MIS 6 ice was likely more powerful for wearing down the bedrock than a thinner LGM glacier. Gravity data in combination with forward modelling thus o ers robust information on the development of a landscape formed through glaciers.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Institute of Geological Sciences 08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology 08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) |
UniBE Contributor: |
Bandou, Dimitri Tibo, Schlunegger, Fritz, Schwenk, Michael Alfred, Schläfli, Patrick Fabian, Douillet, Guilhem Amin, Mair, David |
Subjects: |
500 Science > 550 Earth sciences & geology 500 Science > 580 Plants (Botany) |
ISSN: |
2045-2322 |
Publisher: |
Springer Nature |
Language: |
English |
Submitter: |
Fritz Schlunegger |
Date Deposited: |
04 Feb 2022 11:55 |
Last Modified: |
05 Dec 2022 16:06 |
Publisher DOI: |
10.1038/s41598-022-04830-x |
PubMed ID: |
35087080 |
Uncontrolled Keywords: |
Geology; Geomorphology; Geophysics; Sedimentology |
BORIS DOI: |
10.48350/164963 |
URI: |
https://boris.unibe.ch/id/eprint/164963 |
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