Fig. 6.
Left side: [La/Sm]N, Na8.0, 143Nd/144Nd, and Fe8.0 vs. Cumulative angular distance Dc (°). La and Sm concentrations have been normalized to primitive mantle [9]. Orange, green, and yellow fields correspond to the seafloor domains opened by the X, Y, and Z axes, respectively. The Dc value for each sample was calculated as follow: Dcx = Dxi; Dcy= D1/2(X) + Dyi; Dcz = D1/2(X) + D1/2(Y) + Dzi. Symbols and colors of all samples are the same as presented in other figures. The figure should be read as follows: from left to right the higher the Dc value, the older the seafloor is.