Figure F74. Downhole variation of the Mg# over the entire depth of Hole 735B (Legs 118 and 176) based on 357 whole-rock analyses (see text for sources). The section consists of a stack of a number of chemical/magmatic units, which, in most cases, exhibit an evolution from more primitive gabbro at the bottom to more differentiated members at the top. Symbols are as in Figure F64. Filled triangle = basalt dike Sample 118-735B-23R-4, 83-86 cm.