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Crystallization experiments were conducted at 200 MPa to determine the effect of small amounts of H 2 O on the liquidus temperature of basaltic melts in which plagioclase is the liquidus phase. The H 2 O concentrations in the quenched glasses, determined by infrared spectroscopy and Karl-Fischer titration, ranged from 0.02 to 4.2 wt% H 2 O. The dry liquidus temperature at 200 MPa was estimated from experiments at 1 atm (H 2 O-free) and from the known pressure dependence of plagioclase crystallization temperature. The effect of water (expressed as wt% H 2 O) on the plagioclase liquidus temperature is nonlinear and diminishing with increasing melt H 2 O concentrations. According to our new experimental data, it can be empirically predicted with following equation: (T DRY -T WET ) = 76.99·CH 0.71  H ₂ O

Experimental calibration of the effect of H 2 O on plagioclase crystallization in basaltic melt at 200 MPa