Articles | Volume 74, issue 2
https://doi.org/10.5194/egqsj-74-125-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egqsj-74-125-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
The Mid-Pleistocene landscape history of the Lower Aare Valley with emphasis on subglacial overdeepening
Lukas Gegg
CORRESPONDING AUTHOR
Institute of Geological Sciences, University of Bern, Baltzerstrasse 1 + 3, 3012 Bern, Switzerland
present address: Institute of Earth and Environmental Sciences, University of Freiburg, Albertstraße 23b, 79104 Freiburg, Germany
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The subdivision and distinction of gravel units is an important tool in terrestrial Quaternary stratigraphy but can be challenging. Here, we investigate the glaciofluvial infill of the Upper Rhine Graben as an archive of recurring Alpine glaciations. With the help of statistical approaches, we identify differences in petrographic compositions, thereby differentiating two units that are likely representative of the last and penultimate glaciation, which have previously been difficult to pinpoint.
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Erosion processes below glacier ice have carved large and deep basins in the landscapes surrounding mountain ranges as well as polar regions. With our comparison, we show that these two groups of basins are very similar in their shapes and sizes. However, open questions still remain especially regarding the sediments that later fill up these basins. We aim to stimulate future research and promote exchange between researchers working around the Alps and the northern central European lowlands.
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Sci. Dril., 33, 191–206, https://doi.org/10.5194/sd-33-191-2024, https://doi.org/10.5194/sd-33-191-2024, 2024
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The Tannwald Basin, explored by drilling and formed by repeated advances of the Rhine Glacier, reveals key geological insights. Ice-contact sediments and evidence of deformation highlight gravitational and glaciotectonic processes. ICDP DOVE 5068_1_C core data define lithofacies associations, reflecting basin infill cycles, marking at least three distinct glacial advances. Integrating these findings aids understanding the broader glacial evolution of the Lake Constance amphitheater.
Felix Martin Hofmann, Claire Rambeau, Lukas Gegg, Melanie Schulz, Martin Steiner, Alexander Fülling, Laëtitia Léanni, Frank Preusser, and ASTER Team
Geochronology, 6, 147–174, https://doi.org/10.5194/gchron-6-147-2024, https://doi.org/10.5194/gchron-6-147-2024, 2024
Short summary
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We determined 10Be concentrations in moraine boulder surfaces in the southern Black Forest, SW Germany. We applied three independent dating methods to younger lake sediments. With the aid of independent age datasets, we calculated the growth of 10Be concentrations in moraine boulder surfaces.
Lukas Gegg and Johann Gegg
Sci. Dril., 32, 55–59, https://doi.org/10.5194/sd-32-55-2023, https://doi.org/10.5194/sd-32-55-2023, 2023
Short summary
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Geoscientists working with drill cores often struggle with proper photo documentation. We present a simple smartphone-based setup for acquiring high-resolution undistorted core pictures as an alternative to state-of-the-art commercial line scan imaging systems that are typically expensive and inflexible. It makes use of the phone's panoramic picture mode while being guided along the core in question on a rail, and the resulting images are of similar quality to classic line scan photos.
Lukas Gegg and Frank Preusser
E&G Quaternary Sci. J., 72, 23–36, https://doi.org/10.5194/egqsj-72-23-2023, https://doi.org/10.5194/egqsj-72-23-2023, 2023
Short summary
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Erosion processes below glacier ice have carved large and deep basins in the landscapes surrounding mountain ranges as well as polar regions. With our comparison, we show that these two groups of basins are very similar in their shapes and sizes. However, open questions still remain especially regarding the sediments that later fill up these basins. We aim to stimulate future research and promote exchange between researchers working around the Alps and the northern central European lowlands.
Cited articles
Anselmetti, F. S., Bavec, M., Crouzet, C., Fiebig, M., Gabriel, G., Preusser, F., Ravazzi, C., and DOVE scientific team: Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations, Sci. Dril., 31, 51–70, https://doi.org/10.5194/sd-31-51-2022, 2022.
Bini, A., Buoncristiani, J. F., Couterrand, S., Ellwanger, D., Felber, M., Florineth, D., Graf, H. R., Keller, O., Kelly, M., and Schlüchter, C.: Die Schweiz während des letzteiszeitlichen Maximums (LGM) 1 : 500 000, Bundesamt für Landestopographie swisstopo, https://opendata.swiss/de/dataset/die-schweiz-wahrend-des-letzteiszeitlichen-maximums-lgm-1-500000 (last access: 6 November 2024), 2009.
Gegg, L. and Preusser, F.: Comparison of overdeepened structures in formerly glaciated areas of the northern Alpine foreland and northern central Europe, E&G Quaternary Sci. J., 72, 23–36, https://doi.org/10.5194/egqsj-72-23-2023, 2023.
Gegg, L., Buechi, M. W., Ebert, A., Deplazes, G., Madritsch, H., and Anselmetti, F. S.: Brecciation of glacially overridden palaeokarst (Lower Aare Valley, northern Switzerland): result of subglacial water-pressure peaks?, Boreas, 49, 813–827, https://doi.org/10.1111/bor.12457, 2020.
Gegg, L., Deplazes, G., Keller, L., Madritsch, H., Spillmann, T., Anselmetti, F. S., and Buechi, M. W.: 3D morphology of a glacially overdeepened trough controlled by underlying bedrock geology, Geomorphology, 394, 107950, https://doi.org/10.1016/j.geomorph.2021.107950, 2021.
Gegg, L., Anselmetti, F. S., Deplazes, G., Knipping, M., Madritsch, H., Mueller, D., Preusser, F., Vogel, H., and Buechi, M. W.: Rinikerfeld Palaeolake (Northern Switzerland) – a sedimentary archive of landscape and climate change during the penultimate glacial cycle, J. Quaternary Sci., 38, 174–185, https://doi.org/10.1002/jqs.3471, 2023.
Gegg, L., Anselmetti, F. S., Deplazes, G., Fuelling, A., Madritsch, H., Mueller, D., Preusser, F., and Buechi, M. W.: Glaciations and landscape change in the Lower Aare Valley (Northern Switzerland) through the Middle Pleistocene, Quaternary Res., 125, 134–153, https://doi.org/10.1017/qua.2024.61, 2025a.
Gegg, L., Salcher, B. C., Pollhammer, T., Cohen, D., Fischer, U. H., and Landgraf, A.: An inventory of subglacial overdeepenings in southern Germany and Austria, Boreas, https://doi.org/10.1111/bor.12693, online first, 2025b.
Gegg, L., Kuster, A. M., Schmid, D., and Buechi, M. W.: Quaternary Boreholes QBO Riniken-1 & -2 (QRIN1 & QRIN2) Data Report, Nagra Arbeitsbericht NAB 18-40, https://nagra.ch/downloads/arbeitsbericht-nab-18-40/ (last access: 6 November 2024), 2018.
Gegg, L., Kuster, A. M., Deplazes, G., Madritsch, H., and Buechi, M. W.: Quaternary Borehole QBO Gebenstorf-Brüel (QGBR) Data Report, Nagra Arbeitsbericht NAB 19-02, https://nagra.ch/downloads/arbeitsbericht-nab-19-02/ (last access: 6 November 2024), 2019a.
Gegg, L., Kuster, A. M., Amschwand, D., Huber, M., Deplazes, G., Madritsch, H., and Buechi, M. W.: Quaternary Borehole QBO Gebenstorf-Vogelsang (QGVO) Data Report, Nagra Arbeitsbericht NAB 19-03, https://nagra.ch/downloads/arbeitsbericht-nab-19-03/ (last access: 6 November 2024), 2019b.
Gegg, L., Kuster, A. M., Schmid, D., Lemke, K., Deplazes, G., Madritsch, H., and Buechi, M. W.: Quaternary Borehole QBO Untersiggenthal (QUST) Data Report, Nagra Arbeitsbericht NAB 19-01, https://nagra.ch/downloads/arbeitsbericht-nab-19-01/ (last access: 6 November 2024), 2019c.
Graf, H. R.: Stratigraphie von Mittel-und Spätpleistozän in der Nordschweiz, Beiträge zur Geologischen Karte der Schweiz (N. F.) 168, 198 pp., ISBN 978-3-302-40050-1, 2009.
Lowick, S. E., Buechi, M. W., Gaar, D., Graf, H. R., and Preusser, F.: Luminescence dating of Middle Pleistocene proglacial deposits from northern Switzerland: methodological aspects and stratigraphical conclusions, Boreas, 44, 459–482, https://doi.org/10.1111/bor.12114, 2015.
Magrani, F., Valla, P. G., Gribenski, N., and Serra, E.: Glacial overdeepenings in the Swiss Alps and foreland: Spatial distribution and morphometrics, Quaternary Sci. Rev., 243, 106483, https://doi.org/10.1016/j.quascirev.2020.106483, 2020.
Mueller, D., Preusser, F., Buechi, M. W., Gegg, L., and Deplazes, G.: Luminescence properties and dating of glacial to periglacial sediments from northern Switzerland, Geochronology, 2, 305–323, https://doi.org/10.5194/gchron-2-305-2020, 2020.
Mueller, D., Gegg, L., Fülling, A., Buechi, M. W., Deplazes, G., and Preusser, F.: Luminescence dating of glacially sourced deposits from northern Switzerland: Comparing multigrain aliquots and single grains of quartz and feldspar, Quat. Geochronol., 82, 101551, https://doi.org/10.1016/j.quageo.2024.101551, 2024.
Nagra: Morphology of the Overdeepened Gebenstorf-Stilli Trough (Lower Aare Valley) from Seismic Surface Wave Investigations, Nagra Arbeitsbericht NAB 21-18, https://nagra.ch/en/downloads/arbeitsbericht-nab-21-18-2/ (last access: 6 November 2024), 2021.
Pietsch, J. and Jordan, P.: Digitales Höhenmodell Basis Quartär der Nordschweiz – Version 2014 und ausgewählte Auswertungen, Nagra Arbeitsbericht NAB 14-02, https://nagra.ch/downloads/arbeitsbericht-nab-14-02 (last access: 6 November 2024), 2014.
Preusser, F., Graf, H. R., Keller, O., Krayss, E., and Schlüchter, C.: Quaternary glaciation history of northern Switzerland, E&G Quaternary Sci. J., 60, 21, https://doi.org/10.3285/eg.60.2-3.06, 2011.
Swisstopo: swissALTI3D, Swisstopo, https://www.swisstopo.admin.ch/de/hoehenmodell-swissalti3d (last access: 6 November 2024), 2011.
Short summary
Drillings, outcrops, and seismic data provide insights into a glacial basin and a former river channel in northern Switzerland. Both are infilled with diverse (glacial, lacustrine, fluvial, colluvial) sediments attributed to three separate glaciations. The depth of the glacial basin depends strongly on the underlying rock type, which together with (hydro)fractures provides evidence on the conditions and erosion processes at the ice–rock interface.
Drillings, outcrops, and seismic data provide insights into a glacial basin and a former river...