Figure 19. A spidergram for a diabase clast from interval 149-899B-34R-1, 58-62 cm, normalized to primitive mantle and the five common basalt provinces for comparison and source determination. The large Rb, Ba, and K peaks reflect the strong enrichment of these elements by seafloor weathering. These peaks are so large they obscure the typical strong Nb-Ta peak relative to the IAT spidergram, although it is still present. The positive Sr and Eu peaks must relate to the abundance of plagioclase in this clast.