(Article of periodic en Anglais - 2012)

Document title

The possible role of magnetic measurements in the discrimination of Sahara/Sahel dust sources

Authors(s) and Affiliation(s)

LYONS R. (1 2) ; OLDFIELD F. (1) ; WILLIAMS E. (3) ;
(1) School of Environmental Sciences, Univ., Liverpool, ROYAUME-UNI
(2) Inst. of Geography and Earth Sciences, Univ. of Wales, Aberystwyth, ROYAUME-UNI
(3) Parsons Lab., Massachusetts Inst. of Technology, Cambridge, ETATS-UNIS


The mineral magnetic properties of deposited dusts collected along a broadly north-to-south transect across Niger have been investigated on both a bulk and particle size-specific basis. Dusts display a general north-to-south gradient in fine-grained ferrimagnetic mineral (magnetite/maghemite) concentrations, with samples south of the Sahara/Sahel transition, generally containing greater concentrations than dusts from further north where the climate is much drier. This distinction is seen especially clearly in the clay fraction, which harbours the products of weathering and pedogenesis. The AA. suggest that the regional distinction in both dust and surface soil/sand magnetic properties can be related to differences in weathering regime between the arid Saharan parts of the transect and the Sahel sites where higher rainfall has permitted stronger weathering and pedogenesis.


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, no6 [pp. 594-606]

Bibliographic references : 2 p.

Collation : 7 fig., 4 tabl.



INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2268

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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