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Platinum-group elements in silicate rocks of the Lower, Critical and Main Zones at Union Section, Western Bushveld Complex

Maier Wolfgang D. et Barnes Sarah-Jane. (1999). Platinum-group elements in silicate rocks of the Lower, Critical and Main Zones at Union Section, Western Bushveld Complex. Journal of Petrology, 40, (11), p. 1647-1671.

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Résumé

Concentration patterns of platinum-group elements (PGE) in the Lower, Critical and Main Zones of the Bushveld Complex are modelled by a process of metal collection by segregating sulphide melt followed by fractional crystallization of monosulphide solid solution (mss). Separation of Os–Ir–Ru–Rh-enriched mss cumulate ore and Pt–Pd-enriched residual sulphide melt is inferred to have occurred by upward percolation of interstitial silicate melt entraining sulphide melt, whereas mss crystals are entrapped by early crystallizing chromite. This process resulted in Os–Ir–Ru–Rh enrichment of the chromitites and an upward increasing trend of(Pt + Pd)/(Os + Ir + Ru). Crystallization of platinum-group minerals (PGM) from S-undersaturated sulphide melt or from coalescing noble metal clusters are alternative possibilities to explain the observed PGE patterns, but remain difficult to model at present. Remobilization of Pt and Pd by percolating late magmatic hydrous fluids could have resulted in metal enrichment of pre-existing magmatic sulphides, but this model is not supported by the metal budget of the ‘reefs’ and the field data. There is no evidence for solid substitution of PGE into oxides and silicates.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0022-3530
Volume:40
Numéro:11
Pages:p. 1647-1671
Version évaluée par les pairs:Oui
Date:1999
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:Bushveld Complex, magmatic sulphides, platinum-group elements, South Africa
Déposé le:04 mai 2016 21:16
Dernière modification:09 déc. 2016 14:12
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