The geochemistry of some kimberlites from the type area in Kimberley South Africa, in relation to models of kimberlite petrogenesis

sition elements may carry information on the origin of the magmas.If melting of a recently metasomatized mantle could provide a sa¬ tisfactory interpretation, v/all rock alteration formalized with the zone refining equation fit well the present data.An important im¬ plication of this process is the rapid equilibration of high partition coefficient elements (HRE for instance) with conduit walls in con¬ trast witn low partition coefficient elements (LRE).It is found that a liquid generated in the garnet stability field of the mantle and rising through spinel Iherzolites or harznurgites would result in mag¬ mas .lavinggeochemical characteristics similar to melilitites or K! nberlites.