Articles | Volume 12, issue 9
https://doi.org/10.5194/se-12-2041-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-12-2041-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
| 
09 Sep 2021
Research article | Highlight paper |
| 09 Sep 2021
| 09 Sep 2021
Rheological stratification in impure rock salt during long-term creep: morphology, microstructure, and numerical models of multilayer folds in the Ocnele Mari salt mine, Romania
Marta Adamuszek
CORRESPONDING AUTHOR
Computational Geology Laboratory, Polish Geological Institute – National Research Institute,
Warsaw, Poland
Dan M. Tămaş
Department of Geology and Research Center for Integrated Geological
Studies, Babeș-Bolyai University, Cluj-Napoca, Romania
Jessica Barabasch
Institute for Tectonics and Geodynamics, RWTH Aachen University, Aachen,
Germany
Janos L. Urai
Institute for Tectonics and Geodynamics, RWTH Aachen University, Aachen,
Germany
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Marbles in the desert areas of Namibia and Oman were found to be consumed from inside the rock mass by microbiological activity of a thus far unknown nature that created bands of parallel tubules. These bands formed along fractures in the rock and only surfaced after erosion made them visible. We consider this a new niche for life that has so far not been described. These life forms may have an unknown impact on the global carbon cycle.
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Triaxial compression tests at different effective stresses allow for analysing the deformation behaviour of Opalinus Clay, the potential host rock for nuclear waste in Switzerland. We conducted microstructural investigations of the deformed samples to relate the bulk hydro-mechanical behaviour to the processes on the microscale. Results show a transition from brittle- to more ductile-dominated deformation. We propose a non-linear failure envelop associated with the failure mode transition.
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Rock fractures are organized as networks with spatially varying arrangements. Due to networks' influence on bulk rock behaviour, it is important to quantify network spatial variation. We utilize an approach where fracture networks are treated as spatial graphs. By combining graph similarity measures with clustering techniques, spatial clusters within large-scale fracture networks are identified and organized hierarchically. The method is validated on a dataset with nearly 300 000 fractures.
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An experimentally deformed sample of Opalinus Clay (OPA), which is being considered as host rock for nuclear waste in Switzerland, was studied by electron microscopy to image deformation microstructures. Deformation localised by forming micrometre-thick fractures. Deformation zones show dilatant micro-cracking, granular flow and bending grains, and pore collapse. Our model, with three different stages of damage accumulation, illustrates microstructural deformation in a compressed OPA sample.
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Short summary
We analyse folded multilayer sequences in the Ocnele Mari salt mine (Romania) to gain insight into the long-term rheological behaviour of rock salt. Our results indicate the large role of even a small number of impurities in the rock salt for its effective mechanical behaviour. We demonstrate how the development of folds that occur at various scales can be used to constrain the viscosity ratio in the deformed multilayer sequence.
We analyse folded multilayer sequences in the Ocnele Mari salt mine (Romania) to gain insight...
