The investigated carbonatite occurrence is situated in the southern part of the farm Eureka No. 99 which is located on the south-eastern border of Damaraland (Fig. 1). Von Knorring and Clifford (1960) have previously interpreted the monazite-rich carbonate veins as skarn deposits. While the U-Pb isotope study of Burger et al (1965) on monazites from these "marbles of the Hakos Series" yielded a concordant age of 500 ± 20 Ma, an igneous origin of the Eureka carbonatite dykes was considered by Verwoerd (1967). A detailed re-investigation of the occurrence by Dunai (1989) led to the present Sr-isotope study to assess a possible magmatic origin of the Eureka carbonatite dykes.