Abstract
We conducted hydration experiments of peridotites at 580°C,1.3GPa to investigate the hydration rate of peridotite in the mantle wedge. Orthpyroxene(opx) showed serrated texture ,but olivine(ol) did not show any obvious reaction texture. Thus, hydration rate of opx is probably much higher than that of ol at this condition. Avrami equation was fitted into bulk(peridotite) conversion rate data,and we got the reaction front migration velocity G=1 μm/day.Then, the hydration velocity was compared with the fluid advection velocity by using the characteristic time. Consequently, it is suggested that the modes of porous flow and channel flow are equilibrium and disequilibrium respectively. These flow modes is the same as the assumed flow modes in Iwamori(1998).
