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- W294570897 abstract "The Red Lake greenstone belt records a 300 Ma history of episodic volcanism, sedimentation, deformation, and mineralization. The Balmer assemblage, host to current and past-producing gold mines, consists of tholeiitic and komatiitic lava flows intercalated with 2.98–2.96 Ga felsic volcanic, clastic, and chemical sedimentary rocks. The Ball assemblage comprises crustally contaminated komatiite, tholeiitic basalt, 2.94–2.92 Ga calc-alkaline, felsic volcanic rocks, and stromatolitic carbonate. The Slate Bay sedimentary assemblage of wacke, conglomerate and less than 2.91 Ga quartzose arenite records accumulated Balmerand Ball-age material, prior to the 2.89 Ga intermediate pyroclastic volcanism and sedimentation of the Bruce Channel assemblage. The Confederation assemblage rests unconformably on the Balmer, and consists of basal conglomerate, 2.74 Ga FIII-type rhyolite and tholeiitic basalt with volcanogenicmassive-sulphide-style alteration-mineralization, and younger 2.73 Ga calc-alkaline pyroclastic rocks. Polyphase deformation involved pre-Confederation tilting and at least two episodes of post-Confederation deformation reflected by folds and fabrics of low to moderate finite strain. 1 Contribution to the Western Superior NATMAP Project 1 Resume : La ceinture de roches vertes de Red Lake temoigne de 300 Ma de volcanisme episodique, de sedimentation, de deformation et de mineralisation. L’assemblage de Balmer, hote de mines d’or actuelles et passees, contient des coulees de laves tholeiitiques et komatiitiques intercalees avec des roches volcaniques felsiques, des roches clastiques et des roches sedimentaires chimiques datant de 2,98 a 2,96 Ga. L’assemblage de Ball comporte des komatiites a contamination crustale, des basaltes tholeiitiques, des roches volcaniques felsiques calco-alcalines de 2,94 a 2,92 Ga, et des roches carbonatees stromatolitiques. L’assemblage sedimentaire de Slate Bay comprend des wackes, des conglomerats et des arenites quartzeuses de moins de 2,91 Ga et atteste l’accumulation de materiaux de l’âge des assemblages de Balmer et de Ball avant le volcanisme pyroclastique intermediaire et la sedimentation (2,98 Ga) qui ont produit l’assemblage de Bruce Channel. L’assemblage de Confederation repose en discordance sur l’assemblage de Balmer et comporte un conglomerat de base, une rhyolite du type FIII et du basalte tholeiitique (2,74 Ga) avec alteration-mineralisation de type sulfures massifs volcanogenes, et des roches pyroclastiques calco-alcalines plus jeunes (2,73 Ga). La deformation polyphasee a comporte un basculement anterieur et au moins deux episodes de deformation posterieures a la formation de l’assemblage de Confederation, ce dont temoigne la presence de plis et de fabriques associes a des contraintes totales faibles a moderees." @default.
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- W294570897 date "2000-01-01" @default.
- W294570897 modified "2023-10-14" @default.
- W294570897 title "Integrated regional analysis of the Red Lake greenstone belt and its mineral deposits, western Superior Province, Ontario" @default.
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