Cenozoic alkali basaltic magmas of western Germany and their products of differentiation

An analysis of data on major elements and 31 trace elements in olivine nephelinites, nepheline basanites, basanitic alkali olivine basalts and their differentiates reveals that a granitic partial melt from the wall rocks of magma chambers is responsible for contamination. This is evident from the Nd- and Sr-isotopic patterns of most of these differentiates from different regions in western Germany.