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- W2000837991 abstract "The Chilean Lake District is a geodynamically active area located at the foot of the Andean cordillera and permanently influenced by the Chilean active continental margin. The study area is prone to steady mass movements that are triggered by active volcanism, strong earthquakes and climatic forces. On the glacial-born lake Lago Calafquén high-resolution seismic investigation was performed to select suitable coring sites for sedimentary analyses, to revise the existing bathymetry and to integrate the lake bottom topography into the geomorphological context of the surroundings. The sub-bottom profiling reveals a complex structure of the lake floor, which results in a division into an eastern and a central sub-basin. The eastern basin encompasses the deep basin plain which is a depositional area for dense suspension-loaded underflows. The morphology of the basement of the central sub-basin is affected by large landslides. Large rock-slope failures of debuttressed sidewalls fill the primary lake floor of the southern side covered by more than 40 m of sediment. A high-resolution seismic analysis of the sedimentary infill reveals deposits and structures of large mass movements and turbidites, obviously triggered by strong earthquakes. Incidents related to rebound effects by isostatic uplift are also considered to provoke remarkable magnitudes that trigger mass movement processes in the central sub-basin. Furthermore, volcanic impact frequently interrupts normal lacustrine sedimentation of the sediment succession by deposition of tephra layers. The serialized geodynamic impacts on Lago Calafquén cause severe damage to the sedimentary archive. Thus, suitable coring sites for palaeoenvironmental reconstruction should be selected carefully." @default.
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- W2000837991 date "2007-02-01" @default.
- W2000837991 modified "2023-09-27" @default.
- W2000837991 title "Geomorphological and sedimentological evolution of a lake basin under strong volcano-tectonic influence: The seismic record of Lago Calafquén (south-central Chile)" @default.
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- W2000837991 doi "https://doi.org/10.1016/j.quaint.2006.10.025" @default.
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