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• W2148031991 endingPage "166" @default.
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• W2148031991 abstract "The Archean Bousquet 2-Dumagami deposit is an Au-rich volcanogenic massive sulfide deposit (VMS) with atotal production of 3.87 Moz Au, 2.77 Moz Ag, 80,000 metric tons (t) Cu, and 5,000 t Zn. The deposit is locatedwithin the Doyon-Bousquet-LaRonde mining camp in northwestern Quebec and hosted by the 2704 to 2695Ma Blake River Group, the world’s most productive volcanic assemblage for Au-rich VMS deposits.The Bousquet 2-Dumagami deposit consists of stacked, deformed, and transposed semimassive to massivepyrite-rich lenses, breccia zones, and associated sulfide veins and stringer zones hosted by the upper memberof the Bousquet Formation, ~50 to 100 m stratigraphically below the <2687 Ma Cadillac Group sedimentaryrocks. The main ore zone is known as the Massive Hangingwall zone at the Bousquet 2 mine and Zone 5 at theDumagami mine. Another semimassive to disseminated pyrite-rich auriferous zone with coarsely recrystallizedmassive pyrite is present in the footwall (Massive Footwall zone). The Massive Hangingwall zone is an Au-Ag-Cu-Zn sheet-like, semimassive to massive, pyrite-rich sulfide lens intermixed with vein and breccia zones. Thedominant ore type consists of Au-Cu mineralization, but its upper and eastern parts are enriched in Zn. The oreconsists of a complex assemblage of sulfides, sulfosalts, and native gold, including abundant pyrite, sphalerite,a few percent of chalcopyrite, bornite, and galena, with some visible gold. The Massive Hangingwall zone wasformed by subsea-floor replacement of footwall calc-alkaline dacitic volcaniclastic rocks and hanging-wall bluequartz-phyric rhyolite.Despite significant north-south shortening and metamorphism, which was responsible for transposition,flattening, folding, and recrystallization, mineralogical gradients related to alteration-induced compositionalvariations can still be identified. A number of different metamorphic mineral assemblages can be mapped overseveral tens of meters from distal to proximal to the ore: (1) quartz-muscovite ± Mn-garnet ± biotite ± chlorite;(2) quartz-muscovite ± pyrite; (3) quartz-muscovite-andalusite-pyrophyllite-pyrite with topaz and diaspore; and(4) massive quartz-pyrite. A quartz-carbonate-biotite assemblage occurs in the hanging wall of the Zn-rich MassiveHangingwall zone and is hosted by andesitic sills. The thickness of each of these assemblages varies from afew meters to tens of meters. All metamorphosed alteration assemblages are characterized by strong progressiveNa2O depletion. Gains in MnO, Fe2O3(total), MgO, and CaO are recorded in the quartz-muscovite ± Mngarnet± biotite ± chlorite assemblage, whereas gains in K2O and losses in CaO occur in the quartz muscovite± pyrite assemblage. In the quartz-muscovite-andalusite-pyrophyllite-pyrite and the proximal massive quartzpyriteassemblages all oxides, except SiO2, Fe2O3(total), and TiO2, were strongly to almost entirely leached. Theandalusite-kyanite-pyrophyllite–bearing aluminous assemblages are interpreted to represent metamorphosedequivalents of synvolcanic alteration produced by acidic and oxidizing hydrothermal fluids (i.e., metamorphosedadvanced argillic-style alteration), whereas the massive quartz-pyrite assemblage is similar to the massive silicicalteration commonly associated with advanced argillic alteration. The timing of Au mineralization is consideredto be close to the age of the host rhyolite (2697.8 ± 1 Ma) and the age of the overlying felsic volcanic rocks(2697.5 ± 1.1 Ma).The major Au endowment of the Doyon-Bousquet-LaRonde mining camp may be related to favorablesource rock or Au reservoirs specific to the lower crust or upper mantle beneath the eastern Archean BlakeRiver Group. Exploration for additional Au-rich VMS in this environment should focus on distal quartz- andMn-rich garnet-biotite and proximal aluminous assemblages with anomalously high Au and/or Cu and Zn inintermediate to felsic transitional to calc-alkaline volcanic or volcaniclastic rocks located underneath a youngersedimentary cover." @default.
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• W2148031991 date "2013-11-19" @default.
• W2148031991 modified "2023-10-15" @default.
• W2148031991 title "The Bousquet 2-Dumagami World-Class Archean Au-Rich Volcanogenic Massive Sulfide Deposit, Abitibi, Quebec: Metamorphosed Submarine Advanced Argillic Alteration Footprint and Genesis" @default.
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• W2148031991 doi "https://doi.org/10.2113/econgeo.109.1.121" @default.
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