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, Na_2...