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TitleStructural and lithological controls on gold mineralization at the Cheminis mine: implications for the formation of gold deposits along the Larder Lake - Cadillac deformation zone, Ontario
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLafrance, B
SourceTargeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration; by Dubé, B (ed.); Mercier-Langevin, P (ed.); Geological Survey of Canada, Open File 7852, 2015 p. 49-54, https://doi.org/10.4095/296628 Open Access logo Open Access
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Dubé, B; Mercier-Langevin, P; (2015). Targeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration, Geological Survey of Canada, Open File 7852
File formatpdf
ProvinceOntario
NTS32D/03; 32D/04
AreaKirkland Lake; Larder lake
Lat/Long WENS -80.0000 -79.0000 78.2500 78.0000
Subjectseconomic geology; structural geology; quartz veins; Archean; gold; mineralization; deformation; structural analyses; structural interpretations; Larder Lake-Cadillac deformation zone; Cheminis Mine; Precambrian
Illustrationslocation maps; photographs; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-4), Gold Ore Systems
Released2015 06 11
AbstractThe Larder Lake-Cadillac deformation zone (LLCDZ) is a major deformation zone within the southern Abitibi subprovince of the Archean Superior Province. It hosts several gold deposits, including the Cheminis and the giant Kerr Addison - Chesterville deposits in Ontario. The two deposits occur along a strongly deformed band of Fe-rich tholeiitic basalt and komatiite of the Larder Lake Group (ca. 2705 Ma), bounded on both sides by younger, less deformed, Timiskaming turbidite (2680-2670 Ma). Gold was emplaced during D2 closure of an extensional Timiskaming basin, following the formation of early F1 folds. D2 deformation was a progressive compressive deformation event that began with regional F2 folding and the formation of a regional S2 cleavage, and ended with the localization of the deformation along the band of older volcanic rocks, the formation of the LLCDZ, and the introduction of gold during south-side-up reverse-slip faulting along the LLCDZ. The presence of weakly deformed syenite dykes suggests a minor magmatic contribution to the gold-bearing hydrothermal fluids. Thus, gold was deposited as hydrothermal fluids flowed upward along the LLCDZ during D2 south-side-up shearing.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This volume summarizes 18 research activities completed under the TGI-4 lode gold ore systems project that focused on lode gold deposits in ancient, deformed and metamorphosed terranes mainly located in the Superior and western Churchill geological Provinces.
GEOSCAN ID296628

 
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