A fully funded 3.5-year PhD project in igneous petrology and geochemistry has opened at the Earth Dynamics Research Group (https://geodynamics.curtin.edu.au) as part of an Australian Research Council Discovery Future Fellowship project “Linking the deep carbon cycles with critical mineral deposits”. Project background The current consensus is that carbonatites are produced by low-degree partial melting of the Earth’s mantle, but not the usual mantle. Experimental, geochemical, and isotopic studies suggest that the lithospheric mantle is the source of carbonatite, but it must be fertilised in a particular way by CO2-rich fluids or magmas, the so-called carbonate metasomatism. Carbonate metasomatism has been rep