Griffin gabbro sills (2111 Ma, Nunavut, Canada)

Griffin gabbro (2111 Ma) ridge, in middle of photo, forming a sill in south-dipping Paleoproterozoic Hurwitz Group strata, Montgomery Lake, Nunavut, northern Canada. The Griffin gabbro sills may record a mantle plume related to the opening of the Manikewan Ocean, which separated the Superior and Churchill provinces before Trans-Hudson orogenic events. Photo by L.B. Aspler.

see: Aspler, L.B., Cousens, B.L., and Chiarenzelli, J.R., 2002. Griffin gabbro sills (2.11 Ga), Hurwitz Basin, Nunavut, Canada: long-distance intracratonic transport of mafic magmas in western Churchill Province crust. Precambrian Research , 117, 269-294.