Figure F3. Figure F3. Estimated Kerguelen hotspot magma output since ~130 Ma (Coffin et al., 2002). 130 Ma (Coffin et al., 2002). Analytical uncertainties for ⁴⁰Ar/³⁹Ar ages are variable, but 2- values are generally <5 m.y. Therefore, ages were assigned to various portions of the province (Fig. F1) in 5-m.y. bins (diamonds) for the purpose of calculating the hotspot magma flux. The dashed line between 95 and 85 Ma indicates assumed Ninetyeast Ridge crust of that age buried beneath the Bengal Fan, produced at the same rate as Ninetyeast Ridge and Skiff Bank crust from 85 to 35 Ma.