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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Other Proterozoic Inliers – Coen•Newberry Metamorphic Group– Divided in<strong>to</strong> 3 named units– High-grade metasedimentary and meta-igneous rockssimilar <strong>to</strong> Yambo Metamorphic Group– Sedimentary pro<strong>to</strong>liths uncertain– Iso<strong>to</strong>pic constraints (Blewett et al., 1998)• Felsic gneisses; ages <strong>of</strong> 1564±12Ma and 1561±15Maare probably metamorphic ages• Cores in one sample yield an age <strong>of</strong> 1638±9Ma•Coen Metamorphic Group– Divided in<strong>to</strong> 4 metamorphic units– Schist, gneiss and lesser quartzite; lacks orthogneissand mafic rocks <strong>of</strong> Newberry and Yambo MetamorphicGroups– Iso<strong>to</strong>pic constraints (OZCHRON)• Feldspathic gneiss has zircons with zoned igneousrims <strong>of</strong> 1554±4Ma (possibly in situ partial melting)with cores at ~1585, ~1700 and 1770Ma