Hydrogeologic evidence for a continuous basal shear zone within a deep-seated gravitational slope deformation (Eastern Alps, Tyrol, Austria) |
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Authors: | Herfried Madritsch Bernard M J Millen |
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Institution: | (1) Institute of Geology and Paleontology, Leopold Franzens University, Innrain 52, 6020 Innsbruck, Austria;(2) Present address: Institute of Geology and Palaeontology, University of Basel, Bernoullistrasse 32, 4056 Basel, Switzerland |
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Abstract: | The currently inactive deep-seated gravitational slope deformation (DGSD) Sagspitz in Tyrol, Austria, covers an area of 3 km2 and originated along a glacially over-steepened slope composed mainly of phyllites belonging to the Innsbruck Quartzphyllite
Complex. Past mass movement processes caused the formation of fracture systems and slump bodies which consequently form the
aquifers of relatively large springs in a rock type with generally very low permeability and poor porosity. Analysis of water
chemistry, oxygen isotope, and field parameters of the springs emerging from the DGSD imply that multilevel aquifers exist
and enabled the detection of continuous deep flow paths through the entire length of the mass movement from the main scarp
to the toe of the slope. It is shown that the aquifer boundaries and spring emergences throughout the loosened rock mass can
be correlated to the internal and basal shear zones of the DGSD so that this hydrogeological approach proved to be useful
for evaluating the mass movement structure. |
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Keywords: | Deep-seated gravitational slope deformation Oxygen isotope Hydrogeology Basal shear zones Tyrol Austria |
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