Paleoproterozoic submarine intrabasinal rifting, Baffin Island, Nunavut, Canada: volcanic structure and geochemistry of the Bravo Lake Formation

Rocks of the Bravo Lake Formation on Turtle Back Island and Pillow Island off the western coast of central Baffin Island, Nunavut, represent a well-exposed example of the mafic volcanic and intrusive sequences commonly preserved near the base of Paleoproterozoic intracratonic basins in the Archean Rae and Hearne provinces of the Canadian Shield. The Bravo Lake Formation is composed of relatively undeformed amygdaloidal pillowed flows, radial columnar and tortoise-shell jointed pillows, hydroclastic breccia, extensional partially sheeted dyke swarms, laminated mafic sediments, massive and fragmental flows, and layered and megacrystic intrusions. Volcanic structures and textures imply emplacement in a low-energy shallow (