Signatures géomorphologiques de l'activitée tectonique plio-quaternaire dans le sud des Andes centrales, Argentine

Abstract : The mechanisms and the timing of the building of the Neuquén Andes in the southern central Andes of Argentina, are poorly documented during the Plio-Quaternary. In this work, we studied morphotectonics evidence to characterize the orogenic front propagation showing a compressional state of stress during the Plio-Quaternary. The southern Neuquén Andes correspond mechanically to an orogenic tectonic wedge while its northern part implies initially isolated crustal blocks in the foreland. In addition, a broad uplifting area in the current foreland shows that the lateral growth of the Neuquén Andes is registered far from the commonly recognized orogenic front. Moreover, we interpret contemporaneous extensional structures as large scale gravity glidings which are usually observed along passive margins. Crustal uplifts and ductile layers in the sedimentary cover would be the primarily control parameters of the gliding. Numerical models and an analytical solution show that the incision and sedimentation could modify the mechanical parameters and thus favour or inhibit the process.
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Tectonics. Université de Pau et des Pays de l'Adour, 2010. French


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Contributor : Grégoire Messager <>
Submitted on : Tuesday, March 29, 2011 - 12:00:41 PM
Last modification on : Tuesday, March 29, 2011 - 1:25:53 PM

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  • HAL Id : tel-00580790, version 1

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Grégoire Messager. Signatures géomorphologiques de l'activitée tectonique plio-quaternaire dans le sud des Andes centrales, Argentine. Tectonics. Université de Pau et des Pays de l'Adour, 2010. French. <tel-00580790>

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