Alkaline lamprophyres from the Sokli complex, northern Finland

Abstract

Alkaline lamprophyric dykes in the Sokli carbonatite complex closely resemble kimberlites in mineralogical and chemical composition. Mineralogically, they differ from kimberlites by the presence of high-manganese ilmenite and richterite, and the absence of high-pressure minerals and cognate inclusions. They most likely represent altered kimberlites with a high degree of crustal contamination and carbonatite admixture.