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TitleLithologic controls on Paleoproterozoic BIF-hosted/associated gold: overview of Re-Os geochronology and Pb isotopes preliminary results
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AuthorMercier-Langevin, P; Valette, M; De Souza, S; Creaser, R A; McNicoll, V J; Grondin-LeBlanc, P; St. Pierre, B; Lauzon, M -C; Malo, M; Côté-Mantha, O; Simard, M
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 147-152, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
NTS45M; 46D; 46E; 46L; 46M; 47D; 55; 56; 57A; 57B; 65; 66A; 66B; 66C; 66F; 66G; 66H; 66I; 66J; 66K; 66N; 66O; 66P; 67A
AreaMeliadine District
Lat/Long WENS-104.0000 -86.0000 68.5000 60.0000
Subjectseconomic geology; tectonics; geochronology; mineral deposits; mineral exploration; mineral potential; gold; ore mineral genesis; mineralization; ore controls; modelling; bedrock geology; basement geology; lithology; sedimentary rocks; iron formations; igneous rocks; intrusive rocks; syenites; granites; greenstones; metamorphic rocks; gneisses; structural features; faults; shear zones; metamorphism; radiometric dating; isotopic studies; lead isotope ratios; metallotects; tectonic history; hydrothermal systems; orogenesis; scanning electron microscopy; mass spectrometer analysis; arsenopyrite; pyrrhotite; Archean; Canadian Shield; Western Churchill Province; Hearne Domain; Rae Domain; Chesterfield Block; Chesterfield Fault Zone; Amaruq Deposit; Vault Deposit; Meadowbank Deposit; Tiriganiaq Deposit; Three Bluffs Deposit; Nueltin Suite; Dubawnt Supergroup; Amer Shear Zone; Happy Lake Shear Zone; Josephine River Shear Zone; Pyke Fault; Queen Maud Block; Snowbird Tectonic Zone; Tyrrell Shear Zone; Wager Bay Shear Zone; Paleoproterozoic; ore systems approach; banded iron-formation-hosted gold deposits; rhenium-osmium dating; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Gold systems
Released2018 01 19
AbstractEastern Nunavut represents an excellent site to study BIF-hosted gold deposits. Many examples of this type of deposit are present in this region that is largely underlain by Neoarchean rocks that were deformed at Archean and Paleoproterozoic times. Recent research indicates that what was previously considered to be a simple Early Proterozoic gold metallotect associated with the Trans-Hudson orogen at ca. 1.9 to 1.8 Ga rather appears to be a long, multiphase hydrothermal history associated with a number of distinct orogenic events. Preliminary Re-Os analyses on ore-associated arsenopyrite from the Amaruq deposit suggest a major time span with the youngest model ages at ca. 2250 and the oldest at ca. 2650 Ma. Such a long ore-forming history is in agreement with results obtained in the Meliadine district where arsenopyrite Re-Os ages range from 2.3 Ga to 1.8 Ga. The oldest model ages suggest that the Archean basement and host rocks may have played an active role in forming the Paleoproterozoic gold systems.