Rare earth abundances in Mesozoic undersaturated alkaline rocks from West Greenland

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Rare earth element analyses from a series of Mesozoic undersaturated lamprophyre dykes from southern West Greenland show concentration levels comparable to similar rock types elsewhere. An earlier published simple fractionation model, describing their evolution, must be modified. A primitive olivine nephelinitic parent magma similar to the most primitive lamprophyre coexisted in the mantle with a fluid phase and evolved — possibly at a higher level — mainly through crystal fractionation and liquid immiscibility. Crustal contamination may have had minor importance for their evolution.