Fig. 13

Computed viscosities based upon dark and clear glass compositions as a function of temperature. Temperature values taken from Kreston et al. [20] for the estimates of the clear melt liquidus and FeMg exchange between olivine and melt for the dark melt. Note: The range of liquidus temperatures for the clear melt is smaller than the size of the blue-filled circle. Viscosity uncertainties are ± 10% for 95% confidence limits [41] and the gray dashed lines represent isothermal ties for the two temperatures