Quantifying effects of deep and near-surface chemical erosion on cosmogenic nuclides in soils, saprolite, and sediment

Auteur(s) et Affiliation(s)

RIEBE, C.S.

Dept. of Geology and Geophysics, Univ. of Wyoming, Laramie, Etats-Unis

GRANGER, D.E.

Dept. of Earth and Atmospheric Sciences, Purdue Univ., West Lafayette, Etats-Unis

Description :
The AA. quantify the extent to which overlooking effects of chemical erosion introduces bias in interpreting denudation rates from cosmogenic nuclides. They consider two end-member effects : one due to weathering near the surface and the other due to weathering at depth. If this effect is ignored, denudation rates inferred from cosmogenic nuclides will be too low. The AA. derive a general expression, termed the chemical erosion factor, or CEF, which corrects for biases introduced by both deep and near-surface chemical erosion in regolith. CEF is strongly correlated with mean annual precipitation across the sites, reflecting climatic influence on chemical weathering. These results indicate that quantifying CEFs is crucial in cosmogenic nuclide studies of landscapes where chemical erosion accounts for a significant fraction of the overall denudation.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 5, p. 523-533, nombre de pages : 11, Références bibliographiques : 2 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais