Scientific article

Origin of turbidites in deep Lake Geneva (France–Switzerland) in the last 1500 years

Published inJournal of sedimentary research, vol. 85, no. 12, p. 1455-1465
Publication date2015

Turbidites in lacustrine sediments are commonly used to assess the frequencies of flood events and/or earthquakes. Understanding the origin of those deposits is key to adequately assess the sources and triggers of such events in large lacustrine systems. Ca/Ti X-ray fluorescence core scanner and magnetic susceptibility values on sediment cores of the deep basin of Lake Geneva are used as a provenance indicator of the turbidites either from the Dranse or Rhone deltas or from the slopes not influenced by deltaic input. This tool is validated by mineralogical analyses (X-ray diffraction), major-, and trace-element geochemistry (X-ray fluorescence). Based on this discrimination method, the turbidites deposited in the central part of the deep basin can be classified regarding their origin. From all identified turbidites, four turbidites are chosen based on their large depositional area and volumes and are studied in more detail in order to better understand the processes leading to turbidite deposition in the deep basin. The age intervals of these turbidites were compared to the historical records of extreme events in the region of Lake Geneva. These turbidites can be related to extreme floods, earthquakes, and “spontaneous” delta collapses. The cause of two turbidites could not be identified precisely due to large dating intervals that did not allow attributing a specific historical event to the turbidite layer. Overall, this study provides a tool in classifying the turbidites in deep Lake Geneva and exemplifies that defining the cause of turbidites is complex although it remains a prerequisite for paleohydrology and paleoseismology studies.

  • Turbidite
  • Lake Geneva
  • XRF
  • Flood deposit
  • Rhône
  • Dranse
  • Mineralogy
  • History
  • Delta collapse
  • Sublacustrine mass movement
  • Holocene
  • Swiss National Science Foundation - 121666; 146889; R'Equip-146889; 133481
  • Swiss National Science Foundation - International Short Visit IZK0Z_154263
Citation (ISO format)
KREMER, Katrina et al. Origin of turbidites in deep Lake Geneva (France–Switzerland) in the last 1500 years. In: Journal of sedimentary research, 2015, vol. 85, n° 12, p. 1455–1465. doi: 10.2110/jsr.2015.92
Main files (1)
Article (Published version)
ISSN of the journal1527-1404

Technical informations

Creation12/14/2015 10:22:00 AM
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