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Érosion et transport de matière sur le versant occidental des Andes semiarides du Nord du Chili (27 - 32 ° S) : d'une approche à grande échelle temporelle et spatiale, jusqu'à l'évolution quaternaire d'un système fluvial

Abstract : The Principal Cordillera of the semiarid Andes is a transient relief that developed after the Andean uplift initiated in the Oligocene. Pediment altitudes of the Principal Cordillera in relation with others of the Coastal Cordillera indicate two kilometers of uplift. In response to the uplift depth-incised valleys (~2 km) were excavated in the high cordillera during the last six million years. The incised volume of the valleys and 10Be concentration of fluvial-glacial sediments indicate erosion rates from thirty to seventy-five meters per million years, values that have been relatively constant during the last six million years. During this period the dynamic of material transfer has been modulated by glacial erosion and exportation of fluvial-glacial sediments downstream from the plio-quaternary glacial fronts.
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https://tel.archives-ouvertes.fr/tel-00546459
Contributor : Williams Exbrayat <>
Submitted on : Tuesday, December 14, 2010 - 11:56:45 AM
Last modification on : Thursday, October 15, 2020 - 4:07:04 AM
Long-term archiving on: : Tuesday, March 15, 2011 - 3:19:49 AM

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  • HAL Id : tel-00546459, version 1

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Germán Alfredo Aguilar Martorell. Érosion et transport de matière sur le versant occidental des Andes semiarides du Nord du Chili (27 - 32 ° S) : d'une approche à grande échelle temporelle et spatiale, jusqu'à l'évolution quaternaire d'un système fluvial. Planète et Univers [physics]. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00546459⟩

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