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| Titel |
Porosity and permeability studies along fault zones in the Wetterstein platform (Triassic) of the Hochschwab area (Eastern Alps, Styria) |
| VerfasserIn |
Doris Rupprecht, Helene Bauer, Kurt Decker |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112023
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| Publikation (Nr.) |
 EGU/EGU2015-12181.pdf |
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| Zusammenfassung |
| The Hochschwab area is a karst plateau in Styria (Austria) that covers an area of about 560
km2. Springs in this area provide about 60% of Vienna´s drinking water. The stratigraphic
sequences comprise Permian to Upper Triassic sedimentary rocks, including limestones and
dolostones of the Wetterstein Fm.
The groundwater circulation follows an E-W directed fluvial pattern and is mainly
controlled by major tectonic faults. The aim of this study is the investigation of the porosity
and permeability evolution along these faults from main slip zones to unfractured
protolith.
Using the standard fault core and damage zone model, we grouped samples into
unfractured and fractured protolith as well as in different fault rocks, like breccias,
cataclasites and stylolithic-fault rocks. Rocks of the damage zone are classified by their
fracture density (m2 fracture surface per m3 rock) and fault rocks according to their matrix
content and differences in grain sizes.
A total of 287 samples from 10 different faults has been investigated in the laboratory
using different methods for porosity and permeability measurements. Results indicate that
limestones and dolostones show different trends in the poro/perm evolution along fault zones.
Also the different rock categories show complex poro/perm features within one
lithology.
Furthermore this study also deals with the applicability of the used methods for the
different rocks categories and presents ideas for further applications. |
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