Barometric results from the Isla Floreana gabbros (left-hand panels) against the estimated Moho pressure and barometric analysis of modern day volcanics in the western (Volcán Wolf) and eastern (Isla Floreana) Galápagos. Modern day estimates are calculated using published clinopyroxene and liquid compositions from Stock et al. (2018) and Gleeson et al. (2020b), for Volcán Wolf (orange) and Isla Floreana (blue), respectively. Calculations are performed in Thermobar, using the Neave and Putirka (2017) barometer solved iteratively with equation 33 from Putirka (2008). Melt matching algorithms were performed with the same limits as used in the original papers. Pressure and temperature estimates derived from the Isla Floreana gabbros, which include cpx–opx thermobarometry, Mg-in-plagioclase thermometry, and FI barometry (assuming pure CO₂ fluids), indicate storage of these gabbros at pressures below the Moho. FI pressures are determined by randomly sampling 1000 temperatures from the clinopyroxene–orthopyroxene thermometry results with the median (circles) and mean ± 2 × standard deviation (solid lines) pressure and temperature results shown. Similar calculations are performed using the Mg-in-plagioclase determined temperatures, with the results displayed using the dashed black lines.