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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Croydon Volcanic Group• Dominated by almost flat-lying sheets <strong>of</strong> felsic ignimbrite• Undeformed and unmetamorphosed• Intruded by comagmatic granites <strong>of</strong> the Esmeralda Supersuite• Both granites and volcanics contain abundant graphitic enclaves– presumably derived from the Etheridge Group at depth• Geochemically peraluminous and reduced – S-types or I-typesmodified by assimilation?• Conventional U-Pb zircon age <strong>of</strong> 1552Ma
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