New geochronologic and paleomagnetic data from the North American Midcontinent Rift (MCR) reveal synchronous emplacement of Beaver River diabase, anorthosite xenoliths within it, Greenstone Flow—one largest lava flows on Earth. A U-Pb zircon date 1091.83 0.21 Ma (2) one is consistent with cumulate forming as part MCR provides a maximum age constraint for diabase. Paired minimum cross-cutting Si...

The Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits in the western segment of Russian Arctic Kolmozero–Voronya greenstone belt are considered two parts an Archean (2.83–2.82 Ga) porphyry-epithermal system, probably oldest one defined Fennoscandian Shield. Formation deposit at epithermal stage system is indicated by spatial genetic relationships with sills granite porphyry, geochemical association...