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TitleContrasting alteration mineral assemblages associated with the Westwood deposit ore zones, Doyon-Bousquet-LaRonde mining camp, Abitibi, Quebec
AuthorWright-Holfeld, A; Mercier-Langevin, P; Dubé, B
SourceGeological Survey of Canada, Current Research (Online) no. 2010-9, 2010, 27 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf (Adobe Acrobat Reader)
NTS32D/01; 32D/02; 32D/03; 32D/06; 32D/07; 32D/08; 32D/11
AreaAbitibi; Rouyn-Noranda; Doyon-Bousquet-LaRonde; 24
Lat/Long WENS-79.5000 -78.0000 48.7500 48.0000
Subjectsmineralogy; economic geology; mineral deposits; mineral occurrences; volcanogenic deposits; sulphide deposits; sulphides; mineralization; alteration; mineral assemblages; deformation; host rocks; Doyon-Bousquet-LaRonde Mining Camp; Westwood Deposit; Noranda Mining Camp; Abitibi Greenstone Belt
Illustrationslocation maps; cross-sections; tables; plots; photomicrographs; profiles
Released2010 11 16
AbstractThe Westwood deposit is located in the prolific Doyon-Bousquet-LaRonde mining camp of the Abitibi greenstone belt. The gold-rich polymetallic ore zones of the Westwood deposit are located in three stacked corridors from north to south: zone 2 extension, north corridor, and Westwood-Warrenmac corridor. The mineralized zones at the Westwood deposit are associated with contrasting alteration assemblages and ore styles described in this report. The study presented here is focused on a selection of closely spaced drill-holes that are aligned on a vertical cross-section cutting through the three mineralized corridors in the central part of the deposit. Widespread quartz-chlorite-sericite alteration and proximal Mn-garnet alteration suggest a volcanogenic massive-sulphide-style alteration halo for the Westwood-Warrenmac and north corridors. Intense deformation and stacking or telescoping of alteration halos hinders a definitive interpretation for the origin of the zone 2 extension veins and dissemination-style mineralization and sericite-quartz alteration assemblage, but a synvolcanic origin cannot be ruled out. Observations made at Westwood suggest that primary permeability of volcanic rocks played a major role in controlling the ore and alteration distribution. Based on these observa-tions, the north and Westwood-Warrenmac corridors are thought to be Au-rich volcanogenic massive-sulphide lenses. The north corridor polymetallic veins may also represent feeders to the ore lenses found higher in the stratigraphy. The zone 2 extension shares characteristics with Au-rich sulphide veins and disseminations typical of the neighbouring Doyon intrusion-related deposit, yet has some alteration traits similar to those of the north corridor and Westwood-Warrenmac ore zones.