干旱区生态环境知识资源中心

The distribution of some trace and rare earth elements in phosphorite samples from the Red Sea area, the Nile Valley and the Western Desert of Egypt is described in this paper. The phosphorites are interbedded with siliciclastic and/or carbonate facies. Elements such as Sc, As and Sr are concentrated in the phosphorites associated with the siliciclastic facies, whereas Cr, V, Zn, Sb, I, Ba, U and Th are enriched in the phosphorites associated with the carbonate facies. Shale-normalized rare-earth element pattern for the Abu Tartur and Yunis phosphorites are similar to those reported for shale, while phosphorites interbedded with the carbonate facies (Wadi Abu Hamra, Abu Shgeili, Queih, Nasser, Duwi together with those of the Nile Valley) show a sea water pattern.