Cation diffusion in olivine--II. Ni-Mg, Mn-Mg, Mg and Ca

Details Cation diffusion in olivine--II. Ni-Mg, Mn-Mg, Mg and Ca Cation diffusion in olivine--II. Ni-Mg, Mn-Mg, Mg and Ca

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1573m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 9, pp.1573-1580

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34

Scientific paper

Diffusivities of bivalent cations. Mg, Ni. Mn and Ca, in olivine were determined experimentally. The diffusivities of Ni and Mn in forsterite were determined by couple annealing between Ni 2 SiO 4 and Mg 2 SiO 4 , and Mn 2 SiO 4 and Mg 2 SiO 4 , respectively. The diffusivities of Mg and Ca in forsterite were determined by the use of 26 Mg and Ca tracers, respectively. Combined with other published results, the diffusion coefficients for bivalent cation diffusion in pure forsterite along the c crystallographic axis range from 2.45 × 10 -11 to 1.4 × 10 -13 cm 2 sec -1 at 1200°C, in the order of Fe > Mn > Co > Ni > Mg > Ca. The results suggest that the diffusivity is governed by at least two factors, i.e. the size of the diffusing ionic species and the change of defect density in the crystal structure which is induced by substitution of diffusing ion for Mg ion.

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