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TitleAge relationships and preliminary U-Pb zircon geochronology results from the Lynn Lake Greenstone Belt
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLawley, C J MORCID logo; Schneider, D; Yang, E; Davis, W JORCID logo; Jackson, S EORCID logo; Yang, Z; Zhang, S; Selby, D
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 133-137, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
NTS64C/05; 64C/06; 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
AreaLynn Lake; Dunphy Lake; Motriuk Lake; Cockeram Lake; Dot Lake; Anson Lake; Barrington Lake; Barrington River; Cartwright Lake; Todd Lake; Zed Lake; Goldstand Lake
Lat/Long WENS-102.0714 -100.0214 57.0642 56.3572
Subjectseconomic geology; geochronology; tectonics; structural geology; mineral deposits; mineral potential; mineral exploration; ore mineral genesis; ore controls; structural controls; gold; base metals; radiometric dating; uranium lead dating; zircon dates; tectonic history; tectonic setting; metamorphism; deformation; foliation; faulting; paragenesis; hydrothermal alteration; intrusions; veins; bedrock geology; structural features; faults; shear zones; host rocks; lithology; igneous rocks; intrusive rocks; diorites; granites; monzo-granites; granodiorites; tonalites; gabbros; volcanic rocks; sediments, volcanogenic; rhyolites; dacites; basalts; tholeiites; andesites; volcano-sedimentary strata; conglomerates; greywackes; Lynn Lake Greenstone Belt; Johnson Shear Zone; Nickel Lake Shear Zone; MacLellan Deposit; Gordon Gold Deposit; Trans-Hudson Orogeny; Paleoproterozoic; Sickle Group; Pool Lake Intrusive Suite; Burntwood Group; Wasekwan Group; Agassiz Metallotect; Phanerozoic; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; tables; photographs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Gold systems
Released2018 01 19
AbstractEvaluating the genetic link between gold, faulting and metamorphism remains a significant challenge at orogenic gold deposits in the absence of precise geochronological constraints with clear paragenetic context. Here we report new field observations and preliminary U-Pb zircon age results from gold deposits hosted within the Paleoproterozoic Lynn Lake greenstone belt. New zircon ages from a faulted, hydrothermally altered and metamorphosed diorite sample intruding the southern edge of the past-producing open-pit constrain the timing of gold, deformation and metamorphism at the Gordon gold deposit to ?1854 Ma. Auriferous veining thus significantly post-dates the age of the volcano-sedimentary host rocks, which are constrained to 1879 to 1892 Ma based on new zircon age dating from two granitic intrusions south of the Gordon gold deposit. Gold thus clearly post-dates some of the earliest deformation events recognized in the La Ronge - Lynn Lake segments of the Trans-Hudson orogeny (ca. 1.87 Ga). The temporal relationship between gold, peak metamorphism and a major deformation phase at ca. 1.81 Ga will be the focus of ongoing Re-Os pyrite and arsenopyrite geochronology of auriferous veins.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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