New insight into polycrystalline diamond genesis from modern nanoanalytical techniques

On the basis of thermodynamic equilibrium data for C-H-O fluids in the mantle we argue that submicron inclusions in diamonds are products of local remobilization connected to fluid-fluxed partial melting and redox freezing. Thus, evidence from these inclusions complements information from classical work on larger inclusions and allows a unique direct insight into the medium in which diamond formed.