Figure 15. A spidergram for a basalt clast from interval 149-899B-27R-1, 13-15 cm, normalized to primitive mantle and the five common basalt provinces for comparison and source determination. The large Nb-Ta peaks relative to the IAT spidergram eliminate this environment as a possible source despite the parallelism of the less mobile elements at an abundance of one. This basalt clast is slightly more enriched in the LREE relative to HREE than either the typical E-MORB or CFB spidergrams, but are most similar to basalts from these environments. The negative Th peak relative to MORB and CFB spidergrams may indicate some removal by seafloor weathering. Ti values are also slightly low.