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Déplacements et déformations dans l'avant-pays d'une chaine de collision (Méthodes d'études et modélisation - exemple du Jura)

Abstract : The sedimentary cover of the Internal Jura, displaced over its basement, conforms well with the model of a thin-skinned thrust sheet. The wedge-shaped sheet, which includes a thick sequence of molasse deposited ahead of the Alpine front, slid over the basement/cover interface. The Alpine crustal thrust sheets created a load at the south-east end of the overthrust European plate. Molass was deposited on the bent plate, and the internal part of the basin was progressively affected by thrusting. The process also induced deformation and displacements in the foreland : gravity spreading in the internal molasse, and a forward motion by rigid slipping. Movement led to a horizontal push, causing deformation by indentation in the Internal Jura. In the plateaux of the External Jura, there is very little extension in the cover and ùinimal shortening in the basement. This shortening induced a décollement under the plateaux. Over the Bresse graben, gravity sliding occured in the form of huge lanslides. These contrasts in the origin of the Jura structures, along a median cross-section from Thonon to Arbois, are shown by geophysical data, construction of a balanced cross-section and calculations of realistic mechanical models for the bending of the foreland plate and for the motion for the cover sheet.
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Submitted on : Friday, July 16, 2010 - 11:29:16 AM
Last modification on : Tuesday, October 19, 2021 - 6:57:59 PM
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Jean-Louis Mugnier. Déplacements et déformations dans l'avant-pays d'une chaine de collision (Méthodes d'études et modélisation - exemple du Jura). Tectonique. Université Joseph-Fourier - Grenoble I, 1984. Français. ⟨tel-00502967⟩

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