Early Proterozoic deformation along the southern margin of the Kisseynew gneiss belt, Trans-Hudson Orogen: a 30 Ma progressive deformation cycle

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Abstract
Fold axes and lineations across the southern margin of the Kisseynew gneiss belt were progressively reoriented from northwesterly to northeasterly during an Early Proterozoic, southwest-directed, compressive deformation cycle. Partitioning of deformation resulted in a concentration of non-coaxial strain along the boundary between the Kisseynew gneiss belt and Flin Flon–Snow Lake belt. The structural evolution was complicated by streamlining of the movement vector around the comparatively rigid Flin Flon–Snow Lake belt. The relationship of metamorphic assemblages to kinematic fabrics indicates that deformation was coeval with a prograde–retrograde metamorphic cycle. Progressive deformation occurred during a period of 30 Ma, which is consistent with Phanerozoic orogenic time scales.