Igneous‐textured and recrystallized amphibolite or pyroxene granulite dykes cut Proterozoic granitoid gneisses in the Port Lincoln area of South Australia. The igneous‐textured dykes are largely Ol‐normative, and the amphibolites Qz‐normative, tholeiites. The igneous‐textured dykes comprise norites, gabbronorites and plagioclase‐phyric dolerites which may be readily distinguished by their different Hy/Di ratios. All three igneous‐textured groups are LREE enriched, but they are further distinguished by their different degrees of HREE fractionation, distinct Zr/Ti and Zr/Y ratios and different combinations of normalized negative Ti, Nb, P, Sr and V anomalies. The compositional variation within the three groups may be modelled by crystal fractionation of opx + cpx + plag and cpx + plag dominated assemblages.