Palaeoproterozoic to Mesoproterozoic Geology of North Queensland

Einasleigh Metamorphics• Psammopelitic gneisses (biotite & calc-silicate types); common mafics; rareleucogneiss (feldspathic psammite?) –> migmatite and anatectic granite• Previously correlated with lower part of Etheridge Group – gradationalboundary - may be partly true, but geochemistry and zircons suggestprovenance differences• Upper amphibolite to transitional granulite metamorphism• Age constraints‣ 1700Ma SHRIMP on detrital zircons in leucogneiss (epiclastic sediments froma felsic igneous source – Black & others, 2005)‣ ~1690Ma SHRIMP on zircons from gneissic granite gives minimum age~1675Ma SHRIMP on zircons from amphiboliteintruding 1695Ma granite gneiss