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Petrogenesis of massive sulphides from the Lac-des-Iles Palladium ore deposits, Western Ontario, Canada

Duran Charley J., Barnes Sarah-Jane et Corkery John T.. (2013). Petrogenesis of massive sulphides from the Lac-des-Iles Palladium ore deposits, Western Ontario, Canada. Dans : 12th SGA Biennial Meeting "Mineral deposits research for a high-tech world" , 12–15 August 2013, Uppsala, Sweden.

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Résumé

Previously characterised as a sulphide-poor Pd ore deposit, massive sulphides have recently been discovered in Lac-des-Iles. The massive sulphides occur across the different lithological units and show variable degrees of alteration. The least altered samples comprise a typical magmatic assemblage of pyrrhotite, pentlandite and chalcopyrite. Chalcopyrite-rich samples are found at the edges of the pyrrhotite/pentlandite-rich pods. Base metal and platinum-group element (PGE) compositions indicate that as a whole they represent a frozen sulphide liquid, different from the one that formed the sulphide-poor samples, that was injected along structural features. The altered samples are rich in pyrite and magnetite. Molecular proportions of base metals and S/Se ratios are the same for the altered and unaltered samples indicating that neither S nor Fe has been remobilized from the system. We propose instead that oxidation was responsible for the observed changes in mineralogy. This alteration event appears not to have affected the PGE content.

Type de document:Matériel de conférence (Article)
Date:2013
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:Massive sulphides, structural control, Lac-des-Iles Pd ore deposits
Déposé le:06 juill. 2016 19:54
Dernière modification:09 déc. 2016 16:07
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