Petrogenesis of Granitoid and Greenstone Rocks in the Yalgoo Area, Murchison Domain of the Youanmi Terrane, Yilgarn Craton, Western Australia, with Emphasis on Granitoid-Hosted Gold Mineralization

Abstract

Two groups of mafic volcanic rocks and three types of granitoids have been identified in the Yalgoo area of Western Australia. Granodiorite records ages of ~2760 Ma and biotite monzogranite ages of 2636 Ma. A 1.85 Ga dolerite dyke is the first Paleoproterozoic dyke identified from the Yilgarn Craton. An indirect age of ~2.63 Ga is inferred for gold mineralization. Geochemical data indicate formation in a continental marginal arc with traces of Hadean crust.