Magrina, Benoit; Jébrak, Michel et Cuney, Michel
(2005).
« Le magmatisme de la région de Kwyjibo, Province
du Grenville (Canada) : intérêt pour les
minéralisations de type fer-oxydes associées ».
Canadian Journal of Earth Sciences, 42, pp. 1849-1864.
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Résumé
The granitic plutons located north of the Kwyjibo property in Quebec’s Grenville Province are of
Mesoproterozoic age and belong to the granitic Canatiche Complex . The rocks in these plutons are calc-alkalic, K-rich,
and meta- to peraluminous. They belong to the magnetite series and their trace element characteristics link them to
intraplate granites. They were emplaced in an anorogenic, subvolcanic environment, but they subsequently underwent
significant ductile deformation. The magnetite, copper, and fluorite showings on the Kwyjibo property are polyphased
and premetamorphic; their formation began with the emplacement of hydraulic, magnetite-bearing breccias, followed by
impregnations and veins of chalcopyrite, pyrite, and fluorite, and ended with a late phase of mineralization, during
which uraninite, rare earths, and hematite were emplaced along brittle structures. The plutons belong to two families:
biotite-amphibole granites and leucogranites. The biotite-amphibole granites are rich in iron and represent a potential
heat and metal source for the first, iron oxide phase of mineralization. The leucogranites show a primary enrichment in
REE (rare-earth elements), F, and U, carried mainly in Y-, U-, and REE-bearing niobotitanates. They are metamict and
underwent a postmagmatic alteration that remobilized the uranium and the rare earths. The leucogranites could also be
a source of rare earths and uranium for the latest mineralizing events.
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