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TitleRecognizing IOCG alteration facies at granulite facies in the Bondy Gneiss Complex of the Grenville Province
AuthorBlein, O; Corriveau, L
Source14th SGA Biennial Meeting, Québec City, Canada: mineral resources to discover, proceedings, volume 3; 2017 p. 907-910
Alt SeriesEarth Sciences Sector, Contribution Series 20160409
PublisherSociety for Geology Applied to Mineral Deposits (SGA)
Meeting14th Biennial SGA Meeting, Society for Geology Applied to Mineral Deposits; Québec, QC; CA; August 20-23, 2017
Mediapaper; on-line; digital
File formatpdf
NTS31G; 31J
Lat/Long WENS -76.0000 -74.0000 47.0000 45.0000
Subjectseconomic geology; mineral deposits; mineral occurrences; mineral assemblages; alteration; volcanogenic deposits; hydrothermal alteration; Bondy Gneiss Complex; Grenville province; IOA-IOCG deposits; Precambrian; Proterozoic
Illustrationsgeological sketch maps; plots
ProgramTargeted Geoscience Initiative (TGI-4), Uranium Ore Systems
AbstractThe Bondy gneiss complex in the southwestern Grenville Province, Canada, hosts a series of 1.4-1.35 Ga mafic to felsic volcanic rocks at granulite facies. Metamorphosed hydrothermal alteration zones constitute large sectors of the complex and have mineral occurrences with up to 28000 ppm Cu, 67 ppm Ag, 500 ppm Co, 9862 ppm total REE and 20 ppm U. Mineral assemblages and lithogeochemical analysis of meta-hydrothermal zones have attributes of Na, Ca-Fe, K-Fe, K, Mg, argillic, phyllic and advanced argillic altered volcanic rocks. In alteration discrimination diagrams, the hydrothermal system shares attributes of IOA-IOCG systems that evolve toward epithermal caps (e.g., Great Bear magmatic zone, Canada; Central Andes, Chile). Bondy footprint is significantly distinct from VMS deposits and other deposit types. We thus interpret the Bondy hydrothermal system as prospective for the variety of mineralisation types typical of IOA-IOCG-epithermal systems.
Summary(Plain Language Summary, not published)
This contribution, co-authored by the Canadian (GSC) and French (BRGM) geological surveys for the SGA 2017 meetings, compares the footprints of the deep metasomatic iron oxide and alkali-calcic alteration ore systems of the Great Bear magmatic zone with the footprint of the Bondy Gneiss Complex in the SW Grenville Province, Québec. This system contrasts with others studied within the Uranium 2.1 activity of the Targeted Geoscience Initiative program in that it was metamorphosed to high grade. Geochemical tools to identify ore deposit models were tested on this metamorphic target and proved highly efficient. Results indicate that Bondy footprint is distinct from the one of volcanogenic massive sulphide deposits and similar to the one of iron oxide copper-gold (IOCG) systems, including of Mantoverde which evolved to the most fertile components of this deposit type. We interpret the Bondy hydrothermal system as prospective for iron oxide-apatite, IOCG and epithermal deposits.