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TitleGeological setting of the 5.2 Moz Au Amaruq banded iron formation-hosted gold deposit, Churchill Province, Nunavut
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AuthorValette, M; De Souza, S; Mercier-Langevin, P; McNicoll, V J; Wodicka, N; Creaser, R A; Côté-Mantha, O; Simard, M
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 83-87, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
AreaWhale Lake; Mammoth Lake
Lat/Long WENS -98.0000 -96.0000 66.0000 65.0000
Subjectseconomic geology; tectonics; mineral deposits; gold; strata-bound deposits; replacement deposits; mineral exploration; ore mineral genesis; mineralization; ore controls; modelling; tectonic setting; deformation; folding; metamorphism; greenschist facies; shearing; strain; fabric analyses; veins; hydrothermal alteration; intrusions; bedrock geology; lithology; sedimentary rocks; iron formations; Algoma type iron formations; cherts; igneous rocks; volcanic rocks; ultramafic rocks; mafic rocks; Archean; Canadian Shield; Churchill Province; Amaruq Deposit; Woodburn Lake Greenstone Belt; Woodburn Lake Group; Rumble Assemblage; Rae Domain; Snow Island Suite; Whale Tail Zone; IVR Zone; ore systems approach; banded iron formation-hosted deposits (BIF); silica flooding; supracrustal rocks; Precambrian
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Gold ore systems - tectonic drivers and conduits
Released2019 03 01
AbstractThe recently discovered 5.2 Moz Au Amaruq deposit in Nunavut is part of the Neoarchean (ca. 2.72-2.63 Ga) Wood-burn Lake greenstone belt, Churchill Province. It is hosted in polydeformed, upper greenschist facies banded iron formation (BIF), volcanic, and detrital sedimentary rocks of the Rumble assemblage of the Woodburn Lake group. The orebodies are primarily hosted in Algoma-type silicate-facies BIF and chert, and occur as stratabound to discord-ant pyrrhotite-rich replacements and arsenopyrite (± löllingite)-bearing zones of silica flooding. Several sets of discordant quartz±carbonate auriferous veins are present and include fault-fill laminated veins in high-strain zones preferentially developed along sheared/folded contacts between sedimentary and volcanic rocks. The host rocks are affected by at least three episodes of deformation. Textural relationships between silicate and sulphide minerals provide evidence for prograde metamorphism associated with the main phase of deformation and main fabrics affecting the ore. Gold was exsolved from löllingite during retrograde metamorphism to lower greenschist facies. Possible Arche-an gold heritage and the timing of the gold mineralization represent key issues that are being addressed to help im-prove exploration models for BIF-hosted/associated gold deposits in the Churchill Province and other Archean terranes.