Tracer diffusion coefficients of 153Gd and 152Eu in olivine tholeiite were determined at 1150 to 1440C. The results were identical for both tracers within experimental error. Between 1440 and 1320C the diffusion coefficients were given by:

D(cm2/s) = 0.058 exp[-40600/RT]

M.Magaritz, A.W.Hofmann:  Geochimica et Cosmochimica Acta, 1978, 42[6], 847-58