Abstract
THE Grenville Province is bounded on the north by the Grenville Front (Fig. 1) and on the south-east by the Appalachian Fold Belt. To the south-west in the St Lawrence Lowlands, Grenville rocks pass beneath sub-horizontal Lower Palaeozoic cover rocks. The Grenville Front is observed to be a fault or metamorphic boundary extending for 1,500 km which truncates several older structural trends. It separates Archaean and Lower and Middle Proterozoic rocks (some of which are unmetamorphosed) to the north from more strongly metamorphosed but generally younger rocks to the south.
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IRVING, E., PARK, J. & ROY, J. Palaeomagnetism and the Origin of the Grenville Front. Nature 236, 344–346 (1972). https://doi.org/10.1038/236344a0
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DOI: https://doi.org/10.1038/236344a0
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