Figure F16. Mg# (calculated as Mg²+/Fe²++Mg²+; Fe²+ = 0.85 × Fe³+) vs. depth for Hole 735B. Gabbroic samples are subdivided on the basis of TiO₂ (see Fig. F17, p. 63). Filled diamonds = troctolite and olivine gabbro having less than 0.4 wt% TiO₂; half-filled diamonds = gabbro, gabbonorite, and disseminated--oxide gabbro having between 0.4 and 1.0 wt% TiO₂; open diamonds = Fe-Ti oxide gabbro with more than 1.0 wt% TiO₂; half-filled squares = felsic samples or hybrid samples with a significant felsic component. Filled triangle = a sample from a basaltic dike.