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Modélisation du cisaillement hercynien de Bretagne centrale : déformation crustale et implications lithosphériques

Abstract : Central Brittany is a particular domain of the Hercynian belt of western Europe that suffered limited thickening during continental collision. It is bounded by two major dextral strike-slip zones. The present study argues that a large part of Central Brittany has been deformed by simple shear. A kinematic model based on a geostatistical analysis of structural data allowed to restore the strain in the area and to examine consequences along its faulted borders. South of Central Brittany, restoration of the deformation was further performed using new geophysical data that show that shearing of this domain was accommodated by scissor-type crustal-scale thrusts. Finally, a comparison of seimic tomographic data with the simple shear model suggests that the whole lithosphere was implied in the Hercynian dextral shearing below Central Brittany.
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https://tel.archives-ouvertes.fr/tel-00003938
Contributor : Alain-Hervé Le Gall <>
Submitted on : Wednesday, December 10, 2003 - 2:45:09 PM
Last modification on : Thursday, January 14, 2021 - 11:42:52 AM
Long-term archiving on: : Wednesday, November 23, 2016 - 4:03:16 PM

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  • HAL Id : tel-00003938, version 2

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Charles Gumiaux. Modélisation du cisaillement hercynien de Bretagne centrale : déformation crustale et implications lithosphériques. Géophysique [physics.geo-ph]. Université Rennes 1, 2003. Français. ⟨tel-00003938v2⟩

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