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(Article of periodic en Anglais - 2010)

Document title

The longevity of hillslope soil in SE and NW Australia

Authors(s) and Affiliation(s)

FIFIELD L.K. (1) ; WASSON R.J. (2) ; PILLANS B. (3) ; STONE J.O.H. (4) ;
(1) Dep. of Nuclear Physics, research School of Physics and Engineering, Australian National Univ., Canberra, AUSTRALIE
(2) Charles Darwin Univ., Northern Territory, Darwin, AUSTRALIE
(3) Research School of Earth Sciences, Australian National Univ., Canberra, AUSTRALIE
(4) Quaternary Research Center and Dep. of Geological Sciences, Univ. of Washington, Seattle, ETATS-UNIS

Abstract

The cosmogenic nuclide 10Be that is produced in the atmosphere and falls out in rainfall (‘garden-variety’ 10Be) is used at a site in SE Australia and one in NW Australia to estimate soil formation rates and natural erosion rates. These soil formation rates are then compared with estimates of modern erosion rates based on surveys of sedimentation in farm dams or 137Cs in hillslope soils. In both cases, modern erosion rates are markedly higher than either soil formation rates or natural erosion rates measured here. At the NW Australian site, the 10Be data are complemented by measurements of in situ 36Cl in nearby limestone cuesta surfaces. These show that the hard-rock surfaces are eroding more slowly than the soils, and that relief is therefore increasing in this landscape. Therefore, the ‘garden-variety’ 10Be can be a very useful tracer, but only if its transport both within the solum and saprolite is taken in account

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2010, vol. 81, no1 [pp. 32-42]

Bibliographic references : 48 ref.

Collation : 5 tabl., 6 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2010.01.003

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2010
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