Greenstone‐Up Shear Sense at the Margin of the Mt Edgar Dome, East Pilbara Terrane: Implications for Dome and Keel Formation in the Early Earth

Abstract

The formation of large granitic domes mantled by metamorphic supracrustal rocks ("greenstones") is a hallmark of Paleoarchean crust (e.g., Hickman, 1984;Ramsay, 1989). Together, they define a "dome-and-keel" architecture, observed in many Paleoarchean to Mesoarchean terranes. Dome-and-keel terranes are thought to record a distinct mode of continental construction on Earth that seeded the growth of continental crust in the Mesoarchean and Neoarchean (Dhuime et al., 2012;Van Kranendonk, 2011). Yet the origin of Eoarchean to Paleoarchean dome-and-keel terranes remains a topic of vigorous debate (e.g., see the starkly different reviews