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

Authors
  • GODARD, Vincent
  • Salgado, Andre
  • Siame, Lionel
  • FLEURY, Jules
  • Team, Aster
Publication Date
Apr 28, 2021
Identifiers
DOI: 10.5194/egusphere-egu21-10051
OAI: oai:HAL:hal-03209511v1
Source
HAL-INRIA
Keywords
Language
English
License
Unknown
External links

Abstract

<p>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 (<sup>10</sup>Be and <sup>26</sup>Al) 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.</p>

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