Home page: Last glacial push moraines - Ice-contact deformations

P. Gander (1996): Letzteiszeitliche Stauchmoränen - Deformation am Eisrand; Diplomarbeit mit Diplomkartierung in Theben West, Luxor, Ägypten; University of Berne, Switzerland.

Lastglacial push moraines - Ice-contact deformations
(Abstract)

Last glacial push moraine in Southern Chile.
Photo Ch. Schlüchter.

Longitudinal ridges in the glacially shaped landscape north of Puerto Montt, Southern Chile are interpreted as a complex of push moraines. They mark the maximum extension of the Llanquihue-Glaciation (21'000 BP). An overview of the properties and processes of push moraines is given.

Structural analysis of the deformed glaciofluvial sediments of the former outwash plain yields the orientation of the push moraine complex and the NNW direction of the former glacier. Glacial stress of ca. 0.2 MPa is deduced from the structural measurements. Modelling hints to high pore water pressures up to l ~ 0.7 Mpa and to a sandy layer of décollement. Furthermore permafrost seems to hinder formation of the push moraine, rather than helping it.

Last glacial push moraine in Linden, Switzerland.
Photo P. Gander.

A profile, glacially multiphased deformed, in Linden, Switzerland is interpreted as an overridden and overconsolidated push moraine. Structural measurements reflect the eastward direction of the Aaregletscher during the last glaciation and allow the distinction of three deformation zones.  
 

Last updated: 10/5/2001