Abstract
Publisher Summary This chapter describes the geology of the 3.8 Ga Nuvvuagittuq Greenstone belt, Northeastern Superior province, Canada. The Nuvvuagittuq belt is a volcano-sedimentary succession that occurs as a tight to isoclinal synform refolded into a more open south-plunging synform, with bedding largely parallel to the main, steeply dipping schistosity. The supracrustal assemblage of the belt is essentially composed of three major lithological units. The Nuvvuagittuq belt is surrounded by a 3.6 Ga tonalite, itself surrounded by a younger 2.75 Ga tonalite. Cummingtonite-amphibolites are the predominant lithologies of the Nuvvuagittuq greenstone belt. These peculiar amphibolites are dominated by cummingtonite, which gives this lithology a light gray to beige color, rather than the dark green to black color characteristic of hornblende-dominated amphibolites typical of the Superior Province. The striking feature of the western limb of the Nuvvuagittuq belt is the presence of numerous ultramafic and gabbroic conformable bodies within the faux-amphibolite.
Published Version
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