Fluviatile Erosions- und Akkumulationsformen
als Indizien jurigpleistozäner und
holozäner Bewegungen in der Nordschweiz
und angrenzenden Gebieten
Abstract
The present report contains the results of a study made in order to find geological evidence for Pleistocene and Holocene tectonic movements in northern Switzerland and neighbouring areas.
In the first part, a study of the subcrop-morphology and a comparative analysis of accumulation- and erosion-terraces is presented in order to find indices for Pleistocene and Holocene movements in the northern Aare valley. There is evidence for a regional tilting movement, with relative uplift in the south (area around Brugg and folded Jura eventually) and down-dip in the north (Rhine-line). Furthermore there are arguments to suspect Pleistocene and Holocene uplifting along the Mandach-fault and along an anticline striking SW-NE through Klingnau.
The second part is a discussion about the geological and geomorphological arguments for movements of the crust in the valley of the Upper Rhine between Tössegg and Basle during the Late Pleistocene and the Holocene. In this area there are neotectonic lines which usually keep distances of 3 to 8 km. Between them the blocks have been rigid at least since the Riss/Würm Interglacial. The differential velocities of the movements are about 0.1 – 0.2 mm a year. However on several neotectonic lines the indicated movements already ended during the Late Pleistocene.
In the third part the courses and the longitudinal gradients of the Black Forest rivers flowing into the Upper Rhine as well as their tributaries are examined referring to neotectonic indications. This goes to prove that various movements of the crust occurred during the whole Quarternary. For example the Hotzenwald directly neighbouring to the valley of the Upper Rhine in the north was upliftet and tilted after the Riss Glaciation.
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