Preprints
https://doi.org/10.5194/esurf-2021-27
https://doi.org/10.5194/esurf-2021-27

  22 Apr 2021

22 Apr 2021

Review status: a revised version of this preprint was accepted for the journal ESurf and is expected to appear here in due course.

Escarpment retreat rates derived from detrital cosmogenic nuclide concentrations

Yanyan Wang and Sean Willett Yanyan Wang and Sean Willett
  • Department of Earth Sciences, ETH Zürich, Zürich, 8092, Switzerland

Abstract. High-relief great escarpments at passive margins present a paradoxical combination of high relief topography, but low erosion rates suggesting low rates of landscape change. However, vertical erosion rates do not offer a straightforward metric of horizontal escarpment retreat rates, so we attempt to address this problem in this paper. We show that detrital cosmogenic nuclide concentrations can be interpreted as a directionally-dependent mass flux to characterize patterns of non-vertical landscape evolution, e.g. an escarpment characterized by horizontal retreat. We present two methods for converting cosmogenic nuclide concentrations into escarpment retreat rates and calculate the retreat rates of escarpments with published cosmogenic 10Be concentrations from the western Ghats of India. Escarpment retreat rates of the Western Ghats inferred from this study vary within a range of 100s m/Ma to 1000s m/Ma. We show that the current position and morphology of the Western Ghats are consistent with an escarpment retreating at a near constant rate from the coastline since rifting.

Yanyan Wang and Sean Willett

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esurf-2021-27', Anonymous Referee #1, 04 Jun 2021
    • AC1: 'Response to Reviewer #1', Yanyan Wang, 03 Aug 2021
  • RC2: 'Comment on esurf-2021-27', Greg Balco, 29 Jun 2021
    • AC2: 'Response to Reviewer Greg Balco', Yanyan Wang, 03 Aug 2021
  • EC1: 'Comment on esurf-2021-27', Jens Turowski, 07 Jul 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esurf-2021-27', Anonymous Referee #1, 04 Jun 2021
    • AC1: 'Response to Reviewer #1', Yanyan Wang, 03 Aug 2021
  • RC2: 'Comment on esurf-2021-27', Greg Balco, 29 Jun 2021
    • AC2: 'Response to Reviewer Greg Balco', Yanyan Wang, 03 Aug 2021
  • EC1: 'Comment on esurf-2021-27', Jens Turowski, 07 Jul 2021

Yanyan Wang and Sean Willett

Yanyan Wang and Sean Willett

Viewed

Total article views: 978 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
727 234 17 978 4 8
  • HTML: 727
  • PDF: 234
  • XML: 17
  • Total: 978
  • BibTeX: 4
  • EndNote: 8
Views and downloads (calculated since 22 Apr 2021)
Cumulative views and downloads (calculated since 22 Apr 2021)

Viewed (geographical distribution)

Total article views: 860 (including HTML, PDF, and XML) Thereof 860 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 23 Sep 2021
Download
Short summary
Although great escarpment mountain ranges are characterized by high relief, modern erosion rates suggest slow rates of landscape change. We question this interpretation by presenting a new method for interpreting concentrations of cosmogenic isotopes. Our analysis shows that erosion has localized onto an escarpment face, driving retreat of the escarpment at high rates. Our quantification of this retreat rate rationalizes the high relief, dramatic landscape with the rates of geomorphic change.