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Felsic I-type granites and associated volcanic rocks of Carboniferous age are extensively developed over an area of 15,000 km2 in northern Queensland. These granites have been subdivided into four supersuites: Almaden, Claret Creek, Ootann and O’Briens Creek.

Granites of the Almaden Supersuite are intermediate to felsic (56–72% SiO2) and are characterised by high K2O, K/K(K + Na), Rb, Rb/Sr, Th, U and relatively low Ba and Sr. The Claret Creek Supersuite granites are a little more felsic (65–77% SiO2), and are chemically distinctive, having higher A12O3, CaO, Na2...

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