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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)
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, (Open Access)
PublisherNatural Resources Canada
Documentopen file
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
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.