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Communication Dans Un Congrès Année : 2001

Characteristics of smectites from nickeliferous laterite in Australia

A Gaudin
  • Fonction : Auteur
A Decarreau
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  • IdRef : 028306554
S Petit

Résumé

Lateritic weathering profiles developed on ultrabasic rocks of the Yilgarn craton (Western Australia) are worked as nickel ore (Murrin Murrin). The upper part of the saprolite consists of a thick (up to 30 m) smectite zone in which nickel is concentrated (up to 2.5 % Ni). These smectites were previously described as nontronites. A refined mineralogical and crystallochemical study (XRD, SEM, TEM, FTIR spectroscopy) gives evidence of a complex nature of these smectites. Their layer charge arises mainly from the octahedral sheet and they must be considered as intermediate between four end-members: Al-montmorillonite, Albeidellite, Fe-montmorillonite, and Fe-nontronite. Moreover these uncommon smectites have a large range of Al for Fe octahedral substitution, more extended than previously reported for natural smectite. Finally, contrary to other lateritic ores (Brazil, New Caledonia) nickel is not clustered in trioctahedral domains or layers of secondary phyllosilicates, but is randomly distributed within the octahedral sheet of dioctahedral smectites.
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Dates et versions

hal-01424691 , version 1 (02-01-2017)

Identifiants

  • HAL Id : hal-01424691 , version 1

Citer

A Gaudin, Y Noack, A Decarreau, S Petit. Characteristics of smectites from nickeliferous laterite in Australia. WATER-ROCK INTERACTION, VOLS 1 AND 2, 2001, Unknown, Unknown Region. pp.395-398. ⟨hal-01424691⟩
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