Figure 20. A spidergram for a diabase clast from interval 149-899B-35R-1, 0-7 cm, normalized to primitive mantle and the five common basalt provinces for comparison and source determination. The strong enrichment in Rb, Ba, and K by seafloor weathering is obvious in the large peaks for these elements. There are also small Sr and Eu peaks related to the abundance of plagioclase in this clast.