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The Narsajuaq terrane is a major component of the Paleoproterozoic Ungava (Trans-Hudson) Orogen of northern Quebec and is a well-exposed mid-crustal block interpreted to be the plutonic roots of a magmatic arc. The Narsajuaq terrane is comprised of a series of hornblende ± pyroxene-bearing plutons and supracrustal rocks which were accreted to the Archean Superior Province basement during the Paleoproterozoic...
There are very few alkaline rocks in Precambrian terrains. The oldest well-documented examples are 2.7 Ga trachytes and leucite phonolites from the Kirkland Lake region of Canada. These rocks are highly potassic, with major- and trace-element characteristics closely resembling those of shoshonitic lavas in modern island arcs. Other examples of Archean alkaline rocks are limited to rare, volumetrically...
The Ungava orogen of northern Quebec is one of the best preserved Proterozoic mobile belts of the world, recording > 200 Ma of plate divergence and convergence. Voluminous magmatism associated with rifting of the Superior Province basement 2.04 Ga resulted in the development of a volcanic rift margin sequence and an ocean basin. Four distinct mafic magma suites were erupted: (1) continental...
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