Abstract

The Mudjatik River area of Northern Saskatchewan is underlain by granitic gneisses interlayered with subordinate metasediments and pyribolites, all of which contain granulite facies mineral assemblages.Four fold-forming deformations (D1 to D4), of presumed Hudsonian age, have resulted in closed and arcuate strike patterns that contrast with the linear domain of the Wollaston Lake fold-belt. Fold superposition involving second and third generation (D2 and D3) major structures is considered the most likely cause of this basin and dome geometry.The orientation and geometry of the fold interference structures are explained by a variation in the amplitude/wavelength (a/w) ratios of the two fold sets involved. Where the a/w ratios of the constituent folds are similar, structural isotropy prevails; where these ratios are markedly different, structural elongation results.An increase in the a/w ratio of the D3 fold set is postulated to account for the eastward transitional passage into the linear pattern of the Wollaston Lake fold-belt.

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