Figure F70. Variation of vanadium with titanium (<2 wt%) in Leg 176 gabbros. Symbols are as in Figure F64. Filled triangle = basalt dike Sample 118-735B-23R-4, 83-86 cm; Leg 118 shipboard sample analysis. Cpx = estimate of average Ti,V composition of clinopyroxene in oceanic gabbros. The variation of vanadium concentration with TiO₂ content shows an inflection at ~0.4 wt% TiO₂, which marks a change in the processes controlling the V and Ti in gabbroic rocks. The Ti-poor samples lie on a mixing line between clinopyroxene, the main Ti and V host phase in these gabbros, and olivine and plagioclase that are virtually devoid of these elements. Samples having >0.4 wt% TiO₂ have lower V/Ti ratios, due to either trapping of interstitial liquid or accumulation of Ti-rich oxide minerals.