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Atmospheric dust contribution to the budget of U-series nuclides in soils from the Mount Cameroon volcano

Abstract : The atmospheric dust contribution to U-series nuclides in soils is evaluated by analyzing two soil and paleo-soil (<10 ka) profiles from the Mount Cameroon volcano where Sr-Nd-Pb fingerprints are clearly affected by Saharan dust accretion. The comparison of measured U-series disequilibria between bulk soils and associated parent lavas suggests that dust inputs can contribute up to 25% of the U and Th budget in soils whereas chemical weathering affects a maximum of 7% of the U budget. The uniform U-Th isotopic composition of the Saharan dust end-member inferred from the soils and the paleo-soils suggests a relative stability of the Saharan dust isotopic composition during the last 10 ka.
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https://hal-brgm.archives-ouvertes.fr/hal-01026403
Contributeur : Anne-Marie Pouget <>
Soumis le : lundi 21 juillet 2014 - 15:31:41
Dernière modification le : lundi 7 septembre 2020 - 16:34:03

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Eric Pelt, François Chabaux, Peter Stille, Christophe Innocent, Bassam Ghaleb, et al.. Atmospheric dust contribution to the budget of U-series nuclides in soils from the Mount Cameroon volcano. Chemical Geology, Elsevier, 2013, 341, pp.147-157. ⟨10.1016/j.chemgeo.2013.01.008⟩. ⟨hal-01026403⟩

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