“…However, there are important differences; the trapped fluid is more enriched in LILE (Ba, K, U, Sr,) and La and is relatively depleted in HFSE (Nb, Ta, Ti and to a lesser extent Zr) when baselined to chondritic-Al. This is demonstrated by comparing trace element ratios in the diamond coat to those from the Mbuji Mayi kimberlite, the host kimberlite for these samples The diamond coat has Nb/Ba ϭ 0.003 to 0.012 and Nb/La ϭ 0.05 to 0.17, which are an order or magnitude lower than in the Mbuji Mayi kimberlite (Nb/La ϭ 0.45 Ϯ 0.25, Nb/La ϭ 3.0 Ϯ 1.1; data from Fieremans et al, 1984;Taylor et al, 1994); Ta/K ϭ 0.0001 to 0.0003 and Ta/U ϭ 0.086 to 0.26, also order of magnitude lower than the Mbuji Mayi kimberlite (Ta/K ϭ 0.004 Ϯ 0.003, Ta/U ϭ 4.5 Ϯ 3, data from Fieremans et al, 1984;Taylor et al, 1994).…”