Scale of relief growth in the forearc of the Andes of Northern Chile (Arica latitude, 18 degrees S)

Schlunegger, F. and Zeilinger, G. and Kounov, A. and Kober, F. and Husser, B.. (2006) Scale of relief growth in the forearc of the Andes of Northern Chile (Arica latitude, 18 degrees S). Terra nova, Vol. 18, no. 3. pp. 217-223.

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The stream profiles of rivers of northern Chile reveal two graded segments separated by 20-km-long knickzones. Their formation was initiated in the Late Miocene in response to surface uplift of the western flank of the Altiplano. This phase of uplift that was coeval with the shift of deformation from the Altiplano to the sub-Andean zone caused relief to grow at the scale of the whole drainage basin. Above and beneath these knickzones, the presence of braided channels and the absence of erosion on adjacent pediplains suggest no substantial modification in the local relief. The knickzones, however, show bedrock channels, and fluvial dissection rates have exceeded erosion rates on adjacent pediplains by two orders of magnitudes. Hence, the data imply that the only geomorphic recorders of relief growth are the knickzones that currently transpose the effects of the Late Miocene phase of surface uplift from the coast to the Altiplano.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Tektonik (nn)
UniBasel Contributors:Kounov, Alexandre
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Blackwell Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:28
Deposited On:22 Mar 2012 14:02

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