Pétrologie et métallogénie d'indices de Ni-Cu de la suite plutonique de "De la Blache", province de Grenville, Québec
|Advisor:||Constantin, Marc; Clark, Thomas|
|Abstract:||This master thesis is a petrographic and metallogenic study of Ni-Cu prospects associated with the De La Blache Plutonic Suite (DLBPS), in the eastern part of the Grenville Province. Dated at 1327 Ma, the DLBPS intruded during the middle Elsonian. It consists of an anorthositic to leucotroctolitic core, and a (gabbro)noritic(±Ol) to ultramafic border. The studied prospects can be subdivided in two groups: the Outardes-4 South, Boudrias- Est/Doyon and Buse prospects, hosted in ultramafic rocks; and the Thibault prospect, hosted in leucotroctolites. Geochemical data suggests that the different prospects originated from distinct magmas. Se and S concentrations, as well as δ34S values show an important crustal component, related to contamination by the country-rock gneisses. The Ni-Cu deposits formed in the (ultra)mafic units produced by fractional crystallization, as in the classical sulfide magmatic deposits genesis model. The weak economic importance of the studied prospects can be explained by the absence of key factors generally present in worldclass Ni-Cu-PGE magmatic deposits.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||12 April 2018|
|Collection:||Thèses et mémoires|
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