Mechanical validation of balanced cross-sections: The case of the Mont Terri anticline at the Jura front (NW Switzerland) |
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| Institution: | 1. Université de Cergy-Pontoise, Département Géosciences et Environnement, 95000 Cergy-Pontoise, France;2. Federal Office of Topography swisstopo, Wabern, Switzerland;1. School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, NSW 2522, Australia;2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, PR China;3. Changsha University of Science and Technology, Changsha, Hunan 410114, PR China;1. Department of Theoretical and Applied Sciences, Insubria University, Varese, Italy;2. Department of Earth and Environmental Sciences, University of Milan-Bicocca, Milan, Italy;3. Centre for Applied Geoscience, School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth, UK;4. Gole della Breggia Geopark, Morbio Inferiore, Switzerland;1. State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth Sciences, China University of Geosciences, Beijing 100083, PR China;2. CSIRO Earth Science and Resource Engineering, PO Box 1130, Bentley, WA 6102, Australia;3. School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. Department of Applied Geology, Curtin University, Bentley, WA 6845, Australia;5. Department of Geosciences, National Taiwan University, Taipei 106, Taiwan;6. Geological Survey of Norway-NGU, 7491 Trondheim, Norway;7. Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology-NTNU, 7491 Trondheim, Norway;1. Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Spain;2. Université Lille, CNRS UMR 8187, Laboratoire d''Océanologie et de Géosciences, France;3. Instituto Geológico y Minero de España, Unidad de Zaragoza, Spain;1. Department of Geology, Southern Illinois University, Carbondale, IL 62901-4324, USA;2. Department of Geosciences, National Taiwan University, Taipei 106, Taipei, Taiwan, ROC;3. Department of Earth Sciences, National Taiwan Normal University, Wenshan District, Taipei, Taiwan, ROC;4. School of Earth & Environment, University of Leeds, Leeds, UK;5. Department of Geosciences, University of Texas at Dallas, Richardson, TX 75080-3021, USA;1. Physics of Geological Processes (PGP), The NJORD Centre, Department of Geosciences, University of Oslo, Norway;2. Mineralogy Petrology and Tectonics (MPT), Department of Earth Science, Uppsala University, Sweden;3. PoreLab, The NJORD Centre, Department of Geosciences, University of Oslo, Norway;4. Geological Institute, Technical University Bergakademie Freiberg, Germany |
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| Abstract: | Close to north-west front of the Jura thrust belt in Switzerland, the Mont Terri anticline is located at a disruption of the Muschelkalk decollement, due to a former normal fault. Numerous geological data are available thanks to a motorway tunnel cross-cutting the fold and an underground laboratory. Original field data, two geological maps, a borehole, and a highway tunnel constrain the inner structure. The anticline is characterized by an overturned frontal limb, a steep back limb, and a ramp cross-cutting older normal faults. Three geological cross-sections and three 2D kinematic models are proposed as various combinations of fault-bend folding, fault-propagation folding and detachment folding. The main motivation of this study is to illustrate how geometrical constructions can be constrained by the kinematic approach of limit analysis, which determines the optimal deformation, including faults, that verifies mechanical equilibrium and the Coulomb criterion. Matching some of the important kinematic steps assumed in each three interpretations to the optimal deformation leads us to define the compatible ranges of values of the frictional parameters. These ranges allow us to assess the likeliness of the important kinematic steps of each kinematic model. The present analysis provides a quantitative link between the assumed evolution of the internal structure, and the concomitant evolutions of the topography and of the frictional parameters. |
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| Keywords: | Mont Terri Fold-and-thrust belt Limit analysis Balanced cross-section Mechanics |
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