Genesis of Ferropotassic A-Type Granitoids of Mühlig-Hofmannfjella, Central Dronning Maud Land, East Antarctica

Ferrosilite-fayalite bearing charnockite and biotite-hornblende bearing granite areexposed in Mühlig-Hofmannfjella, central Dronning Maud Land of East Antarctica. Both areinterpreted as essentially parts of a single pluton in spite of their contrasting mineralassemblages. Based on petrologic and geochemical studies, it is proposed that H2Oundersaturated parent magma with igneous crustal component that fractionated under different oxygen fugacity conditions resulted in the Mühlig-Hofmannfjella granitoids.