High temperature deformation experiment on iron rich olivine

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Abstract

Triaxial compressive creep experiments were performed on fine-grained Fe rich olivine samples of (Mg0.5, Fe0.5)2SiO4 and (Mg0.7, Fe0.3)2SiO4. Firstly, the fayalite, Fe2SiO4, powder was synthesized in one atmosphere furnace from high-purity oxides. Then, the (Mg0.5)2 Fe0.5)2 SiO4 and (Mg0.7, Fe0.3)2 SiO4 samples were fabricated from a mixture of powders of San Carlos olivine, (Mg0.9, Fe0.1)2 SiO4, and synthetic fayalite, Fe2SiO4. Samples were deformed in a gas-medium apparatus at a temperature of 1223-1473 K and a confining pressure of 300 MPa. Differential stresses in the range from 10 to 300 MPa resulted in strain rates between 10-7 - 10-4S-1. The samples were deformed both in diffusion creep and dislocation creep regimes. From the three dimensional global non-linear fitting of the test data, the stress exponent for Fo50 and Fo70, were determined as 4.1 and 4.3, respectively, and the activation energy for Fo50, and Fo70 as 499kJ/mol and 510kj/mol, respectively. These Fo50 samples creep at a rate over a factor of 10 faster than similar samples of Fo70 and Fo70 samples creep at a rate over a factor of 10 faster than those of Fo90, deformed under the same conditions. Therefore, this paper gives a preliminary test result of effect of iron content on the viscosity of olivine aggregates.

Original languageEnglish (US)
Pages (from-to)999-1004
Number of pages6
JournalActa Petrologica Sinica
Volume21
Issue number3
StatePublished - May 2005

Keywords

  • Experimental study
  • Fe rich Olivine
  • High temperature creep
  • Three dimensional compression

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