“…In supergene environments, and particularly under lateritic conditions, PGEs can be remobilized to form significant supergene enrichments and dispersion haloes in weathering profiles Travis et al, 1976Travis et al, 1993Augé and Maurizot, 1995). Salpeteur et al (1995) show that Pd is preferentially leached in comparison to Pt in laterites.…”
of platinum in aqueous solutions at 25°C and pHs 4 to 10 under oxidizing conditions. Geochimica et Cosmochimica Acta, Elsevier, 2001Elsevier, , 65, pp.4453-4466. <10.1016
“…In supergene environments, and particularly under lateritic conditions, PGEs can be remobilized to form significant supergene enrichments and dispersion haloes in weathering profiles Travis et al, 1976Travis et al, 1993Augé and Maurizot, 1995). Salpeteur et al (1995) show that Pd is preferentially leached in comparison to Pt in laterites.…”
of platinum in aqueous solutions at 25°C and pHs 4 to 10 under oxidizing conditions. Geochimica et Cosmochimica Acta, Elsevier, 2001Elsevier, , 65, pp.4453-4466. <10.1016
“…Keays and Davison (1976) have noted palladium enrichment in lower sections of the oxide zone at Kambalda, Australia. Travis et al (1976) have noted that palladium is depleted at the surface and strongly enriched in the base of the laterite profile at Gilgarna Rocks, Australia. The depletion of palladium in the upper zone of laterite profiles is probably related to concentration of chloride in ground water.…”
A silver-palladium alloy with structural formula close to AgPd has been found in laterite from the Bahia lateritic gold deposit. The alloy occurs in a void of an iron oxide nodule, associated with goethite and hematite. The angular shape and protuberances of the alloy grains suggest crystal growth in a lateritic environment, indicating that the alloy is a secondary mineral precipitated during lateritisation. The oxidation of sulphides of the parent rocks probably favoured the migration of palladium and silver as transient thiosulphate and sulphite complexes. Destruction of the thiosulphate and sulphite ligands could result in precipitation of both palladium and silver as an alloy. Eh-pH phase diagrams for PdHzO-C1 and Ag-H20-C1 systems show that both palladium and silver are stable in lateritic environments under lower redox potentials. Such an environment may exist at the top of the ferruginous zone due to the abundant organic matter near the surface.
“…L'Ir a été également utilisé comme une référence chimique par Travis et al (1976), dans une étude d'évaluation des chapeaux de fer nickélifères en Australie Occidentale. Grant (1986), Olsen et Grant (1991) ont proposé à leur tour la méthode d'isocon, ou ligne formée d'un ensemble de points de même concentration géochimique, pour le calcul des transferts de masse.…”
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