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TitlePaleoproterozoic gold and its tectonic triggers and traps: implications from Re-Os sulphide and U-Pb detrital zircon geochronology, Lynn Lake, Manitoba
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLawley, C J MORCID logo; Selby, D; Davis, W JORCID logo; Yang, E; Zhang, S; Jackson, S EORCID logo; Petts, D CORCID logo; O'Connor, A R; Schneider, D A
SourceTargeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems; by Mercier-Langevin, P (ed.); Lawley, C J MORCID logo (ed.); Castonguay, SORCID logo (ed.); Geological Survey of Canada, Open File 8712, 2020 p. 211-222, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems
File formatpdf
ProvinceManitoba; Saskatchewan
NTS63B/13; 64C/05; 64C/06; 64C/07; 64C/08; 64C/09; 64C/10; 64C/11; 64C/12; 64C/13; 64C/14; 64C/15; 64C/16; 64D/08; 64D/09; 64D/16; 64F/01; 64F/02; 64F/03; 64F/04; 64G/04
AreaLynn Lake
Lat/Long WENS-102.0267 -99.5747 57.0444 56.4706
Subjectseconomic geology; geochronology; tectonics; stratigraphy; Nature and Environment; Science and Technology; mineral deposits; gold; vein deposits; ore mineral genesis; mineralization; ore controls; traps; models; mineral potential; mineral exploration; exploration guidelines; radiometric dating; uranium lead dating; zircon dates; arsenopyrite; pyrite; biotite; tectonic history; tectonic setting; crustal evolution; fluid flow; flow mechanisms; flow regimes; magmatism; intrusions; dykes; sills; volcanism; orogenies; basin evolution; subduction; plate margins; accretion; continental crust; craton; metamorphism; thermal history; crustal thickness; hydrothermal systems; bedrock geology; structural features; faults; faults, normal; lithology; volcano-sedimentary strata; igneous rocks; intrusive rocks; syenites; pegmatites; carbonatites; tonalites; granodiorites; diorites; gabbros; granites; diabases; ultramafic rocks; volcanic rocks; rhyolites; dacites; mafic volcanic rocks; felsic volcanic rocks; sedimentary rocks; psammites; arkoses; conglomerates; pelites; iron formations; metamorphic rocks; migmatites; metavolcanic rocks; unconformities; core samples; Paleoproterozoic; Lynn Lake Greenstone Belt; Trans-Hudson Orogen; Hearne Craton; Sask Craton; Superior Craton; Sickle Group; Burntwood Group; Wasekwan Group; Hughes Lake Unconformity; Wathaman Suite; Pool Lake Suite; Kisseynew Basin; Phanerozoic; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; stratigraphic columns; photographs; geochronological charts; schematic representations
ProgramTargeted Geoscience Initiative (TGI-5) Gold ore systems
Released2020 06 11; 2023 03 17
AbstractOrogenic Au deposits require a trigger to transport auriferous fluids from their deep-seated source regions to their depositional site in the mid- to upper-crust. Defining the tectonic trigger of Au ore systems requires precise age constraints. Herein we address that knowledge gap with new Re-Os sulphide (arsenopyrite and pyrite) and U-Pb detrital zircon geochronology results from the Lynn Lake greenstone belt of the Paleoproterozoic Trans-Hudson Orogen, Manitoba, Canada. We document an early-stage of Au-rich veins (ca. 1.82 Ga) that are coeval with syenitic magmatism (1.83-1.82 Ga) and immediately post-date new ages for the opening and closure of synorogenic basins (1.84-1.83 Ga) and late-stage arc magmatism (1.84-1.83 Ga). Together these data point to the importance of stalled subduction and upwelling asthenosphere as possible triggers for fluid release during the earliest stages of continental collision between the Hearne, Superior, and Sask cratons. New dating further documents a second, overprinting generation of auriferous fluids (ca. 1.78 Ga) that post-dates peak metamorphism (ca. 1.81 Ga). These late-stage fluids were driven by a second thermal pulse (ca. 1.78 Ga), which, based on the timing of coeval, crustally derived pegmatitic dykes, may be related to crustal thickening and/or another unrecognized subcrustal heat source. Mineral exploration should focus on the large-scale architecture that is required to focus multiple pulses of auriferous fluids to the same depositional trap over the lifespan of an orogen.
Summary(Plain Language Summary, not published)
The main objective of phase 5 (2015-2020) of Natural Resources Canada and Geological Survey of Canada's Targeted Geoscientific Initiative (TGI) program was to generate new knowledge, methodologies and models to enhance the exploration industry's ability to detect buried ore deposits. This synthesis volume contains 20 individual papers that discuss craton to deposit-scale characteristics of auriferous deposits, plus some support material pertaining to the TGI-5 Gold project.

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