(Article of periodic en Anglais - 2012)

Document title

Annual fossil organic carbon delivery due to mechanical and chemical weathering of marly badlands areas

Authors(s) and Affiliation(s)

GRAZ Y. (1) ; DI-GIOVANNI C. (1) ; COPARD Y. (2) ; MATHYS N. (3) ; CRAS A. (4) ; MARC V. (4) ;
(1) Univ. Orléans, Univ. François Rabelais -Tours, CNRS/INSU Inst. des Sciences de la Terre Orléans - UMR 7327, Orléans, FRANCE
(2) UMR CNRS 6143 M2C, Univ. Rouen, Dep. Sciences de la Terre, Mont Saint-Aignan, FRANCE
(3) Cemagref Grenoble, U.R. Erosion Torrentielle, Neige et Avalanches, Saint Martin d'Hères, FRANCE
(4) Lab. Hydrogéologie, Fac. des Sciences, Univ., Avignon, FRANCE


This work focuses on fossil organic carbon (FOC) fluxes due to chemical and mechanical weathering of marls in 2 experimental watersheds with typical badlands geomorphology (Draix watersheds, Laval and Moulin, Alpes de Haute Provence, France). A classical geochemical analysis (Rock-Eval 6 pyrolysis) was used to characterize organic matter in the studied samples (bedrocks, soil litters and riverine particles). FOC fluxes were estimated by monitoring the particulate (1985-2005 period) and dissolved (year 2002) exports at the outlet of the watersheds. Results show that FOC delivery is mainly driven by mechanical weathering. These high FOC fluxes from badlands are similar to those observed in tectonically active mountain catchments. At a global scale, these findings suggest that erosion of badlands may contribute significantly to the transfer of FOC from continental surfaces to depositional environments


Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2012, vol. 37, no12 [pp. 1263-1271]

Bibliographic references : 2 p.

Collation : 2 fig., 3 tabl.



INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3232

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