Emplacement and deformation features of syntectonic leucocratic veins from Rainy Lake zone (Western Superior Province, Canada)

摘要: Abstract Networks of leucocratic veins are widespread in the Rice Bay–Redgut Bay domain Rainy Lake zone at Wabigoon–Quetico subprovince boundary (Archean Superior Province, Canada). Vein geometries and their cross-cutting relationships with host rocks indicative syntectonic emplacement within a regional late Archean transpressional deformation event (Kenoran orogeny). The relative folding boudinage compared to indicate that they were emplaced syntectonically D2 deformation. Semi-quantitative strain vorticity analyses confirm syn-D2 timing veins. observed structural features interpreted as being formed during magma along dilatant fractures subsequent solid-state under overall ductile conditions. structures related better preserved domains low post-emplacement intruded into competent rocks, whereas folds boudins well developed relatively incompetent rocks. In high strain, primary intrusive modified or even locally obliterated due increasing It is envisaged kinematics rheological state main controls on style vein variety considered result lithological heterogeneity rather than several distinct magmatic events.