Figure
F30. Downcore
variations in trace element abundances and primitive mantle-normalized ratios
(indicated by a subscript N) for Site 1140 basalts. Lavas from Units 2 and 3 are
distinctly more enriched in Zr and Nb, have lower Cr concentrations, and have
higher (Zr/Ti)N, (Nb/Zr)N, and (Zr/Y)N ratios.