Plateau reduction by drainage divide migration in the Eastern Cordillera of Colombia defined by morphometry and ¹⁰Be terrestrial cosmogenic nuclides

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(Universitat Autònoma de Barcelona. Departament de Geologia)
Owen, Lewis A. (University of Cincinnati. Department of Geology)
Babault, Julien

(Universitat Autònoma de Barcelona. Departament de Geologia)

Date:	2017
Abstract:	Catchment-wide erosion rates were defined using Be terrestrial cosmogenic nuclides for the Eastern Cordillera of the Colombian Andes to help determine the nature of drainage development and landscape evolution. The Eastern Cordillera, characterized by a smooth axial plateau bordered by steep flanks, has a mean erosion rate of 11 ± 1 mm/ka across the plateau and 70 ± 10 mm/ka on its flanks, with local high rates >400 mm/ka. The erosional contrast between the plateau and its flanks was produced by the increase in the orogen regional slope, derived from the progressive shortening and thickening of the Eastern Cordillera. The erosion rates together with digital topographic analysis show that the drainage network is dynamic and confirms the view that drainage divides in the Eastern Cordillera are migrating towards the interior of the mountain belt resulting in progressive drainage reorganization from longitudinal to transverse-dominated rivers and areal reduction of the Sabana de Bogotá plateau.
Grants:	Ministerio de Economía y Competitividad CGL2014-54180-P Ministerio de Economía y Competitividad CGL2010-15416
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Cosmogenic nuclides ; Erosion rates ; Drainage evolution ; Divide migration ; Eastern Cordillera of Colombia
Published in:	Earth surface processes and landforms, Vol. 42, Issue 8 (June 2017) , p. 1155-1170, ISSN 1096-9837

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Record created 2016-12-07, last modified 2022-09-04

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