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Affolter, T. and Gratier, J. (2004). Map view retrodeformation of an arcuate fold-and-thrust belt: The Jura case. Journal of Geophysical Research 109. doi: 10.1029/2002JB002270. issn: 0148-0227. |
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The mechanism of arcuate mountain range formation is a matter of debate. Here we perform a map view restoration of a detailed three-dimensional model of the Jura arc, a typical arcuate mountain range in the foothills of the Swiss and French Alps. This retrodeformation is performed using the UNFOLD surface-balanced program, based on a block mosaic method. It results in a displacement field divergent toward the deformation front. This displacement field suggests counterclockwise rigid rotations in the horizontal plane up to 30¿ in the southern Internal Jura and a corresponding vertical axis rotation or shear strain of the Savoie molasse basin hinterlandward. We also predict a 10¿ clockwise, vertical axis rotation of the molasse basin in Switzerland. All these rotations agree with those documented by paleomagnetic data. The former are taken to result from a substantial decrease in shortening at the southern Jura end, while the divergence of displacements is interpreted to result from variations in the detachment level distribution. The mechanism of arcuate mountain range formation is a matter of debate. Here we perform a map view restoration of a detailed three-dimensional model of the Jura arc, a typical arcuate mountain range in the foothills of the Swiss and French Alps. This retrodeformation is performed using the UNFOLD surface-balanced program, based on a block mosaic method. It results in a displacement field divergent toward the deformation front. This displacement field suggests counterclockwise rigid rotations in the horizontal plane up to 30¿ in the southern Internal Jura and a corresponding vertical axis rotation or shear strain of the Savoie molasse basin hinterlandward. We also predict a 10¿ clockwise, vertical axis rotation of the molasse basin in Switzerland. All these rotations agree with those documented by paleomagnetic data. The former are taken to result from a substantial decrease in shortening at the southern Jura end, while the divergence of displacements is interpreted to result from variations in the detachment level distribution. |
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Methods (continued 2) |
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Keywords
Tectonophysics, Continental contractional orogenic belts, Tectonophysics, Dynamics, gravity and tectonics, Structural Geology, Folds and folding, Structural Geology, Fractures and faults, Geomagnetism and Paleomagnetism, Paleomagnetism applied to tectonics (regional, global), displacement field, fold-thrust belt, restoration, unfolding, Jura, Alps |
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Publisher
American Geophysical Union
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