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Rotations tectoniques et déformation de l'avant-arc des Andes centrales au cours du Cénozoïque

Abstract : A palaeomagnetic and structural study in northern Chile has shown that the sedimentary infill of the Atacama Basin has accumulated in a compressional context since the Late Cretaceous. The palaeomagnetic data point to clockwise rotations and suggest that a right-lateral transpressional shear zone may have controlled the rotations during the Palaeogene. Restoration of the deformation of the Central Andes in map view indicates that the orocline is a feature mainly of the Eastern Cordillera. The spatial variability and large amount of rotation on the Chilean margin point to two episodes of rotation, one in the fore-arc during the Palaeogene and another, more regional, of the entire margin, which was synchronous with deformation in the eastern Cordillera. In conclusion, the results of this study show that compressional deformation and tectonic rotations are two key elements of Andean deformation.
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https://tel.archives-ouvertes.fr/tel-00006036
Contributor : Alain-Hervé Le Gall <>
Submitted on : Friday, May 7, 2004 - 3:17:33 PM
Last modification on : Thursday, January 14, 2021 - 11:41:26 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:53:08 PM

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  • HAL Id : tel-00006036, version 1

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César Arriagada. Rotations tectoniques et déformation de l'avant-arc des Andes centrales au cours du Cénozoïque. Tectonique. Université Rennes 1, 2003. Français. ⟨tel-00006036⟩

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