Figure 14From: Water-melt interaction in hydrous magmatic systems at high temperature and pressure Effect of composition of Na 2 O-SiO 2 melt on the change of NBO/Si caused by dissolved water. Samples were quenched at 100°C/s from 1,400°C at 1.5 GPa. In this system, the Na/Si ratio is equal to the NBO/Si of the anhydrous melt (data from Cody et al. 2005).Back to article page