Geochemistry and REE distribution of apatite from pyroxenite and carbonatite in the Lillebukt Alkaline Complex, Stjernøy, Finnmark, Northern Norway

Abstract

This report presents a chemical analysis of apatite from pyroxenite in the Lillebukt alkaline complex together with older analytical data on REE in apatite from the associated carbonatite. Published REE data on apatite from Siilinj\u00E4rvi are also presented for comparison. \rThe apatite shows a strong enrichment in REE, up to 3000-4000 times chondritic values for LREE. The total REE (including Y) in apatite from the pyroxenite is 3605 ppm and in the carbonatite 3416 ppm. However these values are not directly comparable since there is a difference in the number of analysed elements.\rWhen compared, the apatites from carbonatite (Stjernøy and Siilinj\u00E4rvi) show slightly lower LREE, elevated MREE and lower HREE than apatite from the pyroxenite.