Si and O diffusion in olivine and implications for characterizing plastic flow in the mantle

Details Si and O diffusion in olivine and implications for characterizing plastic flow in the mantle Si and O diffusion in olivine and implications for characterizing plastic flow in the mantle

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..26d&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 21, pp. 26-1, CiteID 2030, DOI 10.1029/2002GL015480

Physics

34

Mineral Physics: Creep And Deformation, Mineral Physics: Defects, Mineralogy, Petrology, And Mineral Physics: Experimental Mineralogy And Petrology, Mineral Physics: Instruments And Techniques

Scientific paper

The relationship between diffusion of individual species and creep of silicates is unclear and has long been debated, factually anchored by the central observation that the activation energies for creep are higher than the activation energy for diffusion of any species. There have been numerous attempts to explain this difference. New advances in experimental technology enable us to demonstrate that this difference does not exist and was an artefact of the limited experimental resolution of earlier studies - the activation energies of creep and diffusion of Si in olivine are identical, 530 kJ/mol. This allows the creep mechanism in olivine to be understood as one of simple climb (consistent with microstructural observations) and opens possibilities of estimating, understanding and predicting the (much simplified) creep behavior of diverse silicates under a wide range of P-T-X conditions through the use of diffusion data-measured or computed.

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