Palaeoproterozoic to Mesoproterozoic Geology of North Queensland
Palaeoproterozoic to Mesoproterozoic Geology of North Queensland
Palaeoproterozoic to Mesoproterozoic Geology of North Queensland
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Einasleigh Metamorphics• Psammopelitic gneisses (biotite & calc-silicate types); common mafics; rareleucogneiss (feldspathic psammite?) –> migmatite and anatectic granite• Previously correlated with lower part <strong>of</strong> Etheridge Group – gradationalboundary - may be partly true, but geochemistry and zircons suggestprovenance differences• Upper amphibolite <strong>to</strong> transitional granulite metamorphism• Age constraints‣ 1700Ma SHRIMP on detrital zircons in leucogneiss (epiclastic sediments froma felsic igneous source – Black & others, 2005)Complex provenance forleucogneiss in the western areaRelatively simple zircon populations in leucogneiss in theLyndhurst area suggesting a 1565Ma metamorphic even<strong>to</strong>verprinting a single ca 1700Ma igneous provenance