The use of ablation-dominated medial moraines as samplers for 10Be-derived erosion rates of glacier valley walls, Kichatna Mountains, AK

Auteur(s) et Affiliation(s)

WARD, D.J.

Dep. of Geological Sciences and Inst. for Arctic and Alpine Research (INSTAAR), Univ. of Colorado, Boulder, Etats-Unis

ANDERSON, R.S.

Dep. of Geological Sciences and Inst. for Arctic and Alpine Research (INSTAAR), Univ. of Colorado, Boulder, Etats-Unis

Description :
The AA. use cosmogenic 10Be concentrations in amalgamated rock samples from active, ice-cored medial moraines to constrain glacial valley sidewall backwearing rates in the Kichatna Mountains, Alaska Range, Alaska. They sampled medial moraines on each of 3 glaciers of different sizes and topographic aspects. Results and discussion about quantitatively several factors that complicate interpretation of cosmogenic concentrations in this material, including the complex scaling of production rates in very steep terrain, the stochastic nature of the rockfall erosion process, the unmixed nature of the moraine sediment, and additional cosmogenic accumulation during transport of the sediment.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 4, p. 495-512, nombre de pages : 18, Références bibliographiques : 1 p.

Date :
2011

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

Langue :
Anglais