Late Quaternary depositional history of the Reuss delta, Switzerland: constraints from high-resolution seismic reflection and georadar surveys

Publication Type  Journal Article
Year of Publication  2002
Authors  Nitsche, F. O.; Green, A. G.; Horstmeyer, H.; Buker, F.
Journal Title  Journal of Quaternary Science
Volume  17
Issue  2
Pages  131-143
Journal Date  Feb
ISBN Number  0267-8179
Accession Number  ISI:000174804800003
Key Words  high-resolution seismic; georadar; overdeepened valley; delta; lake lucerne; 3-dimensional georadar; sediments; architecture; stratigraphy
Abstract  

Glacial erosion has caused overdeepening of many alpine valleys. After retreat of the ice, they were filled with heterogeneous deposits of glacial, lacustrine and fluvial sediments. A typical example of such a valley segment and its infill is the Reuss delta on the southern shore of Lake Lucerne in Switzerland. To obtain a detailed three-dimensional image of this valley segment, the ETH Institute of Geophysics has acquired several two-dimensional, high-resolution seismic and georadar profiles, and conducted a three-dimensional georadar survey. Interpretations of these geophysical data were constrained by a geological core extracted from a borehole 300 m deep near the investigation site. The seismic profiles imaged ca. 600 m of sediment infill above bedrock. Based on their reflection characteristics, five different deposition units were distinguished. These units were interpreted as a succession of clay/silt at the base, followed by different sand units with variable but generally increasing amounts of gravel. This succession represented a prograding delta that filled the southern part of Lake Lucerne. The latest fluvial development of the region is best represented by the georadar data. In particular, the three-dimensional georadar data set provides a detailed view of an ancient braided river channel Copyright (C) 2002 John Wiley Sons, Ltd.

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URL  <Go to ISI>://000174804800003
DOI  Doi 10.1002/Jqs.645