Contrasting types of Late Archean plutonic rocks in northwestern Ontario: implications for crustal evolution in the Superior Province

The Late Archean Aulneau and Lount Lake batholiths have contrasting geochemical characteristics that are interpreted to be a consequence of derivation from different sources. The Aulneau batholith, which was intruded into low-grade metavolcanic rocks of the Wabigoon subprovince, is characterized by high Na2O and low K2O, Rb and Y, together with enriched light rare earth elements (LREE), near-chondritic heavy rare earth elements (HREE), …