Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Pt-Pd reefs in magnetitites of the Stella layered intrusion, South Africa : A world of new exploration opportunities for platinum group elements

Maier Wolfgang D., Barnes Sarah-Jane, Gartz V. et Andrews G.. (2003). Pt-Pd reefs in magnetitites of the Stella layered intrusion, South Africa : A world of new exploration opportunities for platinum group elements. Geology, 31, (10), p. 885-888.

[thumbnail of 03-miaer-Stella.pdf] PDF
Administrateurs seulement

367kB

URL officielle: http://geology.geoscienceworld.org/content/31/10/8...

Résumé

The 3033 Ma Stella layered intrusion of South Africa consists largely of magnetite gabbros and gabbros that are hosted by greenstones of the Kraaipan belt. The intrusion contains a 100-m-thick, platinum group elemen(PGE)–enriched interval that includes a number of laterally continuous PGE reefs constituting the oldest mineralization of this type known on Earth. The richest of the reefs is hosted by magnetitite and contains 10–15 ppm Pt 1 Pd over 1 m, representing by far the highest PGE grades known up to this time in magnetitite-hosted Pt-Pd reefs. The PGEs are interpreted to have been concentrated by sulfide melt, after S saturation had been reached in the advanced stages of magmatic differentiation, in response to magnetite crystallization. Reaction between sulfide melt and oxides led to late magmatic S loss, causing a paucity of sulfides in most of the PGE mineralized interval. As a result, the reefs cannot be distinguished macroscopically from their unmineralized host rocks, and we suggest that similar mineralization may have been overlooked in the upper parts of other tholeiitic intrusions elsewhere.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:31
Numéro:10
Pages:p. 885-888
Version évaluée par les pairs:Oui
Date:Octobre 2003
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:Stella intrusion, platinum group elements, South Africa, greenstone belts, magnetite
Déposé le:10 juin 2016 15:05
Dernière modification:17 nov. 2017 00:38
Afficher les statistiques de telechargements

Éditer le document (administrateurs uniquement)

Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

Bibliothèque Paul-Émile-Boulet, UQAC
555, boulevard de l'Université
Chicoutimi (Québec)  CANADA G7H 2B1
418 545-5011, poste 5630