Quantifying the impact of former glaciation on catchment-wide denudation rates derived from cosmogenic ¹⁰Be

verfasst von

Christoph Glotzbach, Markus Röttjer, Andrea Hampel, Ralf Hetzel, Peter W. Kubik

Abstract

Glacial denudation can significantly perturb terrestrial cosmogenic nuclide depth profiles and, if this is not corrected for, derived apparent denudation rates will overestimate the actual denudation rates. Here we determine how much ¹⁰Be-derived denudation rates - calculated under the assumption of steady state - deviate from actual denudation rates as a function of three parameters: (1) the total amount of glacial denudation, (2) the post-glacial denudation rate and (3) the time elapsed since deglaciation. We provide correction lines for the full parameter space explored (glacial denudation: 0.01-100 m; post-glacial denudation rate: 1-1000 mm/ka; deglaciation: 1-100 ka before present), to evaluate and, if necessary, correct denudation rates for the impact of glacial denudation. Applied to ¹⁰Be-derived catchment-averaged denudation rates for formerly glaciated catchments in the Black Forest, Germany, we find that uncorrected denudation rates overestimate actual rates by up to a factor of three.

Organisationseinheit(en)

Institut für Geologie
Abteilung Geologie
AG Tektonik, Strukturgeologie und tektonische Geomorphologie
Institut für Erdsystemwissenschaften

Externe Organisation(en)

Westfälische Wilhelms-Universität Münster (WWU)
ETH Zürich

Typ

Artikel

Journal

TERRA NOVA

Band

26

Seiten

186-194

Anzahl der Seiten

9

ISSN

0954-4879

Publikationsdatum

06.2014

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Geologie

Ziele für nachhaltige Entwicklung

SDG 15 – Lebensraum Land

Elektronische Version(en)

https://doi.org/10.1111/ter.12085 (Zugang: Geschlossen)