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TitlePaleoproterozoic gold and its tectonic triggers and traps
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AuthorLawley, C J M; Davis, W J; Jackson, S E; Petts, D C; Yang, E; Zhang, S; Selby, D; O'Connor, A R; Schneider, D A
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 71-75, https://doi.org/10.4095/313641 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
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
ProvinceManitoba
NTS64B/12; 64B/13; 64C/09; 64C/10; 64C/11; 64C/12; 64C/13; 64C/14; 64C/15; 64C/16; 64D/09; 64D/16; 64E/01; 64F/01; 64F/02; 64F/03; 64F/04; 64G/04
AreaLeaf Rapids; Lynn Lake
Lat/Long WENS-102.0833 -99.7500 57.1667 56.5000
Subjectseconomic geology; tectonics; structural geology; geochronology; mineral deposits; gold; mineral exploration; modelling; ore controls; ore mineral genesis; mineralization; field relations; greenstone belts; tectonic setting; tectonic history; magmatism; deformation; metamorphism; orogenesis; intrusions; dykes; sills; mineral assemblages; fabric analyses; veins; veinlets; thermal analyses; radiometric dating; bedrock geology; structural features; folds; faults; lithology; Paleoproterozoic; Lynn Lake Greenstone Belt; MacLellan gold deposit; Hearne-La Ronge-Lynn Lake Block; Sask Craton; Superior Province; Hearne Craton; Superior Craton; Trans-hudson Orogeny; Sickle Group; Ralph Lake conglemates; Burntwood Group; Wasekwan Group; Pool Lake Intrusive Suite; Eden Carbonatite; Wathaman Suite; ore systems approach; thermochronology; rhenium-osmium dating; lithotectonic controls; plate collisions; Precambrian; Proterozoic
Illustrationsgeological sketch maps; schematic sections; photomicrographs
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramGold ore systems - tectonic drivers and conduits, Targeted Geoscience Initiative (TGI-5)
ProgramGold ore systems - System Controls - Time and Space, Targeted Geoscience Initiative (TGI-5)
Released2019 03 01
AbstractThe tectonic trigger(s) that controls the formation of large gold deposits hosted within ancient greenstone belts re-main poorly understood. Herein we address that knowledge gap by merging macro- to micro-scale field relationships and multiple mineral chronometers to constrain the timing of magmatism, deformation, metamorphism, and gold in the Lynn Lake greenstone belt, Manitoba. Preliminary monazite and xenotime ages from the MacLellan gold deposit (1.83-1.75 Ga) are coeval with previously reported metamorphic ages for northern Manitoba (1.81-1.78 Ga), which also marks the terminal collision of the composite Hearne-La Ronge-Lynn Lake block and Sask-Superior craton at 1.83 to 1.80 Ga. The peak metamorphic mineral assemblage and dated phosphate minerals define the main structural fabric (D2) of the Lynn Lake greenstone belt, which coupled with the folded, transposed auriferous veins, places a lower limit for the timing of gold at or before 1.75 Ga. However, xenotime within a garnet-hosted and gold-bearing veinlet dated at ca. 1.83 Ga may provide the first evidence for a cryptic early stage of gold mineralization that is coeval with the onset of collisional orogenesis between the composite Hearne and Superior cratons. Ongoing thermo-chronology (e.g. apatite, biotite) and Re-Os pyrite and arsenopyrite dating at gold deposits within the Lynn Lake greenstone belt will further constrain the timing of gold deposition relative to the different stages of the Trans-Hudson orogeny. New ages will inform ore system models by identifying the tectonic trigger(s) for gold and improving exploration targeting in ancient greenstone belts.
GEOSCAN ID313641