Three-dimensional gravity modelling of a Quaternary overdeepening fill in the Bern area of Switzerland discloses two stages of glacial carving ...
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 characteriz...
| Main Authors: | , , , , , , , |
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| Format: | Text |
| Language: | unknown |
| Published: |
Springer Nature
2022
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.48350/164963 https://boris.unibe.ch/164963/ |
| Summary: | 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 ... |
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