The Paleoproterozoic Otish Gabbro suite and coeval dyke swarms of the Superior Province: Probing the ca. 2.17 Ga mantle
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Otish Gabbros were emplaced into the Superior Province ca. 2172–2162 Ma.

Otish Gabbros are contemporaneous with the Biscotasing and Payne River swarms.

Group 1 Otish Gabbros approach liquid compositions. Group 2 gabbros are cumulates.

Ca. 2.17 Ga magmas reflect shallow melting of heterogeneous and enriched mantle.

Ca. 2.7 Ga mafic magmas were emplaced into thin lithosphere in a rifting environment.

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