%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Sawadogo, B.
%A Bamba, O.
%A Chardon, Dominique
%T Landform-regolith mapping in the West African context
%D 2020
%L fdi:010080410
%G ENG
%J Ore Geology Reviews
%@ 0169-1368
%K Pediment ; Weathering profile ; Duricrust ; Detrital duricrust ; Mineral exploration
%K BURKINA FASO ; AFRIQUE DE L'OUEST
%M ISI:000591448400001
%P 103782 [17 ]
%U https://www.documentation.ird.fr/hor/fdi:010080410
%> https://www.documentation.ird.fr/intranet/publi/2020/12/010080410.pdf
%V 126
%W Horizon (IRD)
%X In this paper, we present an integrated landform-regolith mapping protocol/chart for West Africa developed using a case from Central Burkina Faso. The chart accounts for (i) the specificities of the ubiquitous, duricrust-capped remnants of the regional paleolandsurfaces - particularly the residual or detrital character of the Fe duricrusts - and (ii) the diversity of the remaining, non-duricrusted portions of the landscape, with an emphasis on the pitfalls encountered in determining the in-situ or transported character of the regolith. The paper also provides field identification criteria and illustrations of the typical West African landform-regolith associations. The landform-regolith mapping chart is integrated into a prospectivity chart, which is used to define exploration guides: (i) defining sampling strategies, (ii) interpreting potential geochemical anomalies and (iii) targeting lateral extensions of known bedrock mineralizations. The mapping protocol further allows for the definition of a class of landform-regolith association propitious to supergene mineral concentrations. The mapping protocol is shown to be transposable to wetter contexts and, more generally, to other tropical shield provinces.
%$ 064