Australia: Geoscience Australia has recently released two web-based map sheets that show the continental extent and age relationships of Archean mafic and ultramafic rocks and associated mineral deposits. These maps will be of interest to explorers searching for nickel, platinum-group elements, chromium, titanium, vanadium and cobalt.
In Australia, Archean mafic and ultramafic igneous rocks with reliable crystallisation ages are confined to the older crustal components in Western Australia and South Australia. During compilation of the map, twenty-six Archean Magmatic Events (AME) ranging in age from the Eoarchean (~3730 Ma: AME 1) to the late Neoarchean (~2520 Ma: AME 26) were identified.
The Archean mafic-ultramafic magmatism event series commenced in the northwest Yilgarn Craton, with 3730