Hydrothermal processes at oceanic spreading centers are largely influenced by changing magmatic heat input. I use the NaCl-H 2 O FISHES code to investigate the evolution of surface temperature and salinity as a function of time-varying heat flux at the base of a two-phase, vaporbrine hydrothermal system. I consider a two-dimensional rectangular box that is 1.5 km deep and 4 km long with homogeneous permeability of 10 -13 m 2 . Temperature and pressure at top boundary correspond to seafloor conditions of 10C, 25MPa respectively. Impermeable,
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