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La Déformation alpine des massifs cristallins externes (Mont-blanc, Aiguilles rouges, Belledonne) et celle de leur couverture mésozoique (Alpes occidentales)

Abstract : Compared study of structures at all scales of the three external cristalline massive Mont Blanc, Aiguilles Rouges, Belledonne) and their dauphinois cover, has shown that this both structural units has been intensively deformed during the alpine phases. This alpine deformation combines gravitational motion for superficial dauphinois nappes and crustal shortening for the basement. This complex process leads to a regional strain pattern which is the result of superposed deformations. Nevertheless, incremental strain studies have alowed to state precisely the directions of these deformations and have shown a generalized left hand rotation of stretching during the tertiary time. These data alow to propose a tectonic history for the alpine deformation in this external zone. The direction of crustal shortening and gravitational displacement has been firstly northward and secondly westward. This change occurs progressively and is recorded by the ductile and heterogeneous tertiary deformation in both the basement and the coyer.
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Submitted on : Monday, November 21, 2011 - 2:37:45 PM
Last modification on : Monday, December 14, 2020 - 9:42:24 AM
Long-term archiving on: : Wednesday, February 22, 2012 - 2:31:36 AM

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  • HAL Id : tel-00643229, version 1

Citation

Pierre Gourlay. La Déformation alpine des massifs cristallins externes (Mont-blanc, Aiguilles rouges, Belledonne) et celle de leur couverture mésozoique (Alpes occidentales). Tectonique. Université Pierre et Marie Curie - Paris VI, 1984. Français. ⟨tel-00643229⟩

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