Chemical diffusion of Ti under anhydrous conditions at 1atm and under fluid-present elevated pressures (1.1 to 1.2GPa) conditions was measured in natural zircon. Nuclear reaction analysis and the resonant nuclear reaction 48Ti(p,γ)49V were used to measure diffusion profiles. The Arrhenius expression for diffusion at 1350 to 1550C and 1atm was:

D(m2/s) = 3.33 x 102exp[-754(kJ/mol)/RT]

The diffusivities were similar for experiments run under fluid-present conditions. A fit to all of the data yielded the relationship:

D(m2/s) = 1.34 x 102exp[-741(kJ/mol)/RT]

D.J.Cherniak, E.B.Watson: Chemical Geology, 2007, 242[3-4], 473-86