Palaeoproterozoic to Mesoproterozoic Geology of North Queensland

Other Proterozoic Inliers – northern Georgetown (Dargalong)•McDevitt Metamorphics– Laminated to thin-bedded metapelites & subordinate meta-sandstone,quartzite & mafic sills– No isotopic constraints, but lithologically like Corbett and Lane CreekFormations in the Etheridge Group– Intruded by Fig Tree Hill Granite (part of Forsayth Supersuite)•Dargalong Metamorphic Group– Migmatitic gneiss, augen gneiss, amphibolite, schist, quartzite and minorcalc-silicate gneiss– Isotopic constraints• Mylonitised granodioritic to tonalitic gneisses; 1586±5Ma and 1580±4Ma(Blewett et al., 1998)Note that these are orthogneisses and ages probably reflect anatexis andpeak of metamorphism – therefore original age of paragneisses is stillunknown