Nature and distribution of Harmettan dust

Auteurs :
McTAINSH, G. H.
WALKER, P. H.

Description :
Harmettan dust deposition rates measured at Kano northern Nigeria during 1976-1979 range from 137 to 181 t/km/y. The characteristics and geomorphic history of the Chad Basin source deposits are inferred from the broad particle-size range, and the mineralogical and geochemical characteristics of the deposited dust. Sediment supply to the lake source deposits involves fluvio-lacustrine transport of clays, with fluvial transport and salt weathering of silts and aeolian transport of sands. Subsequent aeolian deflation of these produces the Harmattan dust plumes.


Type de document :
Article de périodique

Source :
Zeitschrift für Geomorphologie Stuttgart, 1982, vol. 26, n°. 4, p. 417-435, Références bibliographiques : 43 réf.

Date :
1982