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Origin of the vanadiferous serpentine–magnetite rocks of the Mt. Sorcerer area, Lac Doré layered intrusion, Chibougamau, Québec

Mathieu Lucie. (2019). Origin of the vanadiferous serpentine–magnetite rocks of the Mt. Sorcerer area, Lac Doré layered intrusion, Chibougamau, Québec. Geosciences, 9, (3), p. 110-146.

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Magmatic processes dominate Fe–Ti–V mineralization and revealing these processes is essential for providing a scientific foundation for exploration models. This study focuses on the metamorphosed Neoarchean (ca. 2728 Ma) tholeiitic layered Lac Doré Complex (LDC) that is currently being explored for V. Contamination may play an important role in the evolution of the Fe–Ti–V-enriched layered zone (magnetitite, anorthosite, and gabbro mostly, and ultramafic rocks locally) of the LDC. This hypothesis is tested by performing a detailed chemical and petrological investigation of serpentine-magnetite-dominated rocks located in the Mt. Sorcerer area. The studied rocks have evolved (apatite-bearing, Fe-rich, Cr-Ni-Ti-poor) and primitive (Mg-rich, Si-poor) characteristics. Pre-metamorphism rocks contained olivine Fo82–90 (now serpentine) and magnetite. These rocks formed from a Si-depleted magma under high fO2 conditions (+1.8 to +3.0 relative to the fayalite-magnetite-quartz buffer; FMQ). The V-content of the magnetite varies due to reversals related to multiple injections of an evolved basaltic magma in the upper part of the LDC. The magma interacted with Fe-Mg-rich and Si-Ca-poor carbonate-facies iron formation and crystallized in the presence of oxidizing CO2-bearing fluids. Compositional layering is poorly defined due to a fast cooling rate. Consequently, the distribution of V is relatively homogeneous in the Fe–Mg-rich units of the Mt. Sorcerer area.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 110-146
Version évaluée par les pairs:Oui
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:Lac Doré Complex (LDC), layered intrusion, magnetite, olivine, V mineralization, vanadiferous titanomagnetite, Complexe du Lac Doré (PMA), intrusion stratifiée, magnétite, minéralisation en V, titanomagnétite vanadifère
Déposé le:17 oct. 2019 22:30
Dernière modification:17 oct. 2019 22:30
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