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The first major incision of the Swiss Deckenschotter landscape

Akçar, Naki ; Ivy-Ochs, Susan ; Alfimov, Vasily ; Claude, Anne ; Graf, Hans ; Dehnert, Andreas ; Kubik, Peter ; Rahn, Meinert ; Kuhlemann, Joachim ; Schlüchter, Christian

In: Swiss Journal of Geosciences, 2014, vol. 107, no. 2-3, p. 337-347

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    Titre
    • The first major incision of the Swiss Deckenschotter landscape
    Auteur
    • Akçar, Naki. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland
    • Ivy-Ochs, Susan. Labortory of Ion Beam Physics (LIP), ETH Zurich, Schafmattstrasse 20, 8093, Zurich, Switzerland
    • Alfimov, Vasily. Labortory of Ion Beam Physics (LIP), ETH Zurich, Schafmattstrasse 20, 8093, Zurich, Switzerland
    • Claude, Anne. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland
    • Graf, Hans. Dorfstrasse 40, 8014, Gächlingen, Switzerland
    • Dehnert, Andreas. Swiss Federal Nuclear Safety Inspectorate ENSI, Industriestrasse 19, 5200, Brugg, Switzerland
    • Kubik, Peter. Labortory of Ion Beam Physics (LIP), ETH Zurich, Schafmattstrasse 20, 8093, Zurich, Switzerland
    • Rahn, Meinert. Swiss Federal Nuclear Safety Inspectorate ENSI, Industriestrasse 19, 5200, Brugg, Switzerland
    • Kuhlemann, Joachim. Swiss Federal Nuclear Safety Inspectorate ENSI, Industriestrasse 19, 5200, Brugg, Switzerland
    • Schlüchter, Christian. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Swiss Journal of Geosciences, 2014, vol. 107, no. 2-3, p. 337-347. Springer Basel
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:326158
    Summary
    The Swiss Deckenschotter ("cover gravels”) is the oldest Quaternary units in the northern Swiss Alpine Foreland. They are a succession of glaciofluvial gravel layers intercalated with glacial and/or overbank deposits. This lithostratigraphic sequence is called Deckenschotter because it "covers” Molasse or Mesozoic bedrock and forms mesa-type hill-tops. Deckenschotter occurs both within and beyond the extent of the Last Glacial Maximum glaciers. The Swiss Deckenschotter consist of two sub-units: Höhere (Higher) and Tiefere (Lower) Deckenschotter. Although the Höhere Deckenschotter sub-unit (HDS) is topographically higher than the Tiefere Deckenschotter, it is older. The only available age for the Swiss Deckenschotter is 2.5-1.8Ma based on mammal remains found in HDS at the Irchel site. In this study, we present an exposure age for the topographically lowest HDS, calculated from a cosmogenic 10Be depth-profile. Our results show that the first phase of the Deckenschotter glaciations in the Swiss Alps terminated at least 1,020 $$_{ - 120}^{ + 80}$$ - 120 + 80 ka ago, which is indicated by a significant fluvial incision. This line of evidence seems to be close to synchronous with the beginning of the Mid-Pleistocene Revolution, when the frequency of the glacial-interglacial cyclicity changed from 41 to 100ka and the amplitude from low to high, between marine isotope stages 23 and 22.