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Schaller, Sebastian; Böttcher, Michael E.; Buechi, Marius W.; Epp, Laura S.; Fabbri, Stefano C.; Gribenski, Natacha; Harms, Ulrich; Krastel, Sebastian; Liebezeit, Alina; Lindhorst, Katja; Marxen, Hanna; Raschke, Ulli; Schleheck, David; Schmiedinger, Iris; Schwalb, Antje; Vogel, Hendrik; Wessels, Martin; Anselmetti, Flavio S.

Postglacial evolution of Lake Constance: sedimentological and geochemical evidence from a deep-basin sediment core

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  • Media type: E-Article
  • Title: Postglacial evolution of Lake Constance: sedimentological and geochemical evidence from a deep-basin sediment core
  • Contributor: Schaller, Sebastian; Böttcher, Michael E.; Buechi, Marius W.; Epp, Laura S.; Fabbri, Stefano C.; Gribenski, Natacha; Harms, Ulrich; Krastel, Sebastian; Liebezeit, Alina; Lindhorst, Katja; Marxen, Hanna; Raschke, Ulli; Schleheck, David; Schmiedinger, Iris; Schwalb, Antje; Vogel, Hendrik; Wessels, Martin; Anselmetti, Flavio S.
  • Published: Springer Science and Business Media LLC, 2022
  • Published in: Swiss Journal of Geosciences, 115 (2022) 1
  • Language: English
  • DOI: 10.1186/s00015-022-00412-1
  • ISSN: 1661-8726; 1661-8734
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title><jats:p>The modern, over 250-m-deep basin of Lake Constance represents the underfilled northern part of an over 400-m-deep, glacially overdeepened trough, which reaches well into the Alps at its southern end. The overdeepening was formed by repeated glacial advance-retreat cycles of the Rhine Glacier throughout the Middle to Late Pleistocene. A seismic survey of Lake Constance revealed a Quaternary sediment fill of more than 150 m thickness representing at least the last glacial cycle. The stratified sedimentary fill consists at the base of ice-contact deposits on top of the molasse bedrock, overlain by glaciolacustrine to lacustrine sediments. During the successful field test of a newly developed, mid-size coring system ("HIPERCORIG"), the longest core (HIBO19) ever taken in Lake Constance was retrieved with an overall length of 24 m. The sediments recovered consist of a nearly continuous succession of lacustrine silts and sands including more than 12 m of Late Glacial sediment at the base. 14 lithotypes were identified through petrophysical and geochemical analyses. In combination with a <jats:sup>14</jats:sup>C- and OSL-based age-depth model, the core was divided into three main chronostratigraphic units. The basal age of ~ 13.7 ka BP dates the base of the succession back to the Bølling-Allerød interstadial, with overlying strata representing a complete and thick Younger-Dryas to Holocene succession. The sediments offer a high-resolution insight into the evolution of paleo-Lake Constance from a cold, postglacial to a more productive and warmer Holocene lake. The Late Glacial succession is dominated by massive, m-thick sand beds reflecting episodic sedimentation pulses. They are most likely linked to a subaquatic channel system originating in the river Seefelder Aach, which is, despite the Holocene drape, still apparent in today’s lake bathymetry. The overlying Holocene succession reveals a prominent, several cm-thick, double-turbiditic event layer representing the most distal impact of the Flimser Bergsturz, the largest known rockslide of the Alps that occurred over 100 km upstream the river Rhine at ~ 9.5 ka BP. Furthermore, lithologic variations in the Holocene succession document the varying sediment loads of the river Rhine and the endogenic production representing a multitude of environmental changes.</jats:p>
  • Access State: Open Access