Understanding the fluxes of Au and other trace metals (As, Sb, Ag, Cu, Co, Ni) during Barrovian and blueschist metamorphisms is paramount for improving the geological models of orogenic Au deposits. Gold mobilisation, however, remains poorly understood in certain terranes such as Paleoproterozoic and Archean greenstone belts. During blueschist metamorphism Au behaviour is even less well understood. The driving hypothesis is that Au and other elements are partially mobilised in subduction zones during slab dehydration, leading to Au enrichment in the metasomatised mantle with far reaching implication on a large suite of ore deposit.
