Oxygen diffusion in grossular and some geological implications

K. Wright, R. Freer, C. R.A. Catlow

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Computer simulation techniques were used to investigate defect formation and the diffusion of O and OH groups in grossular garnet. Diffusion of both species along an octahedral edge was simulated, and activation energies for the jump were calculated. The activation energy for O diffusion in the extrinsic regime is predicted to be 106 kJ/mol, whereas for the high-temperature intrinsic regime, an activation energy of 383 kJ/mol is calculated. Extrinsic diffusion of the OH group along the same pathway also has an activation energy of 106 kJ/mol. However, when structurally bound H2O in the form of hydrogarnet defects is introduced into the system, the OH diffusion activation energy is reduced to 67 kJ/mol. The high activation energy combined with experimentally available diffusion coefficients for O in garnet suggest that O mobility is very low at metamorphic temperatures. -from Authors

Original languageEnglish
Pages (from-to)1020-1025
Number of pages6
JournalAmerican Mineralogist
Volume80
Issue number9-10
DOIs
Publication statusPublished - 1 Jan 1995
Externally publishedYes

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