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

Lucía Struth, Antonio Teixell, Lewis A. Owen, Julien Babault

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Copyright © 2016 John Wiley & Sons, Ltd. Catchment-wide erosion rates were defined using 10Be 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. Copyright © 2016 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)1155-1170
JournalEarth Surface Processes and Landforms
Volume42
Issue number8
DOIs
Publication statusPublished - 30 Jun 2017

Keywords

  • cosmogenic nuclides
  • divide migration
  • drainage evolution
  • eastern Cordillera of Colombia
  • erosion rates

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