The diffusivity was measured under 0.1 to 200MPa at 600 to 800C in a pure CO2 atmosphere. The samples were single pre-annealed crystals of Chihuahuan calcite in an isotopically labelled atmosphere, and the diffusion profiles were measured using secondary ionization mass spectrometry. The values of diffusivity at 0.1MPa were described by:

D(cm2/s) = 0.017 exp[-261(kJ/mol)/RT]

This was similar to the relationship for Do at 100MPa:

D(cm2/s) = 0.008 exp[-242(kJ/mol)/RT]

T.C.Labotka, D.R.Cole, L.R.Riciputi, M.Fayek: American Mineralogist, 2004, 89[5-6], 799-806