Cation diffusion in olivine--I. Cobalt and magnesium

Details Cation diffusion in olivine--I. Cobalt and magnesium Cation diffusion in olivine--I. Cobalt and magnesium

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..759m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 5, pp.759-762

Computer Science

15

Scientific paper

Cobalt and magnesium interdiffusion coefficients in synthetic crystals of olivine have been determined by a method of couple annealing. These coefficients increase with temperature and Co concentration. The coefficients in forsterite along the c crystallographic axis range from 1.13 × 10 -12 to 6.85 × 10 -11 cm 2 sec -1 at temperatures ranging from 1150 to 1400°C. The calculated activation energies for Co-Mg interdiffusion in forsterite are 526 kJmol -1 above approximately 1300°C and 196 kJmol -1 at lower temperatures. These results indicate that the Co-Mg mobility in olivine is relatively low compared to published results for Fe-Mg interdiffusion.

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