EGU21-10051
https://doi.org/10.5194/egusphere-egu21-10051
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Detecting transience in slow evolution landscapes using cosmogenic nuclides and high resolution morphometry

Vincent Godard1, Andre Salgado2, Lionel Siame1, Jules Fleury1, and Aster Team1
Vincent Godard et al.
  • 1Aix-Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, 13545, Aix-en-Provence, France
  • 2Department of Geography, Minas Gerais Federal University, CEP 31270-901 Belo Horizonte MG, Brazil

Transient evolution and adjustment to changing tectonic and climatic boundary conditions is an essential attribute of landscapes. We present a new approach to detect and quantify transience in slow erosion landscapes over 100 ka timescales. We compare curvature and cosmogenic nuclides measurements (10Be and 26Al) at hilltop sites with predictions of hillslope diffusion theory, in the slowly evolving quartzitic Serra do Cipó range in SE Brazil, and we observe a distinctive signature of an acceleration of denudation. The timing of this increase cannot be unequivocally associated with a single climatic event but is consistent with climatically-modulated important fluctuations in precipitation and erosion in this area during Middle and Late Pleistocene.

How to cite: Godard, V., Salgado, A., Siame, L., Fleury, J., and Team, A.: Detecting transience in slow evolution landscapes using cosmogenic nuclides and high resolution morphometry, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10051, https://doi.org/10.5194/egusphere-egu21-10051, 2021.

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