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A mathematical model for steady-state regolith production at constant erosion rate

Auteur(s) et Affiliation(s)

LEBEDEVA, M.I.
Center for Environmental Kinetics Analysis, Earth and Environmental Systems Inst., Pennsylvania State Univ., University Park, Etats-Unis
FLETCHER, R.C.
Center for Environmental Kinetics Analysis, Earth and Environmental Systems Inst., Pennsylvania State Univ., University Park, Etats-Unis
Physics of Geological Processes, Univ., Oslo, Norvege
BRANTLEY, S.L.
Center for Environmental Kinetics Analysis, Earth and Environmental Systems Inst., Pennsylvania State Univ., University Park, Etats-Unis


Description :
In this paper, the AA. develop a model for the weathering of a model granite that contains albite and quartz. The model yields 3 different steady-state regimes of weathering. At the lowest erosion rates, a local-equilibrium regime is established where albite is completely depleted in the weathering zone. With an increase in erosion rate, transition and kinetic regimes are established. The steady-state thickness of regolith decreases with increasing erosion rate in the local equilibrium and transition regimes, but in the kinetic regime, this thickness is independent of erosion rate. Analytical expressions derived from the model are used to show that regolith production rates decrease exponentially with regolith thickness. This model illustrates how geochemical and geomorphological observations are related for a simple compositional system.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 5, p. 508-524, nombre de pages : 17, Références bibliographiques : 50 ref.

Date :
2010

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

Langue :
Anglais
Droits :
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