High strain torsion experiment on olivine aggregates

Yong Hong Zhao, Chao Qi, Yang Li, M. Zimmerman, David L. Kohlstedt

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4 Scopus citations

Abstract

Torsion experiments were conducted in a high-pressure and high-temperature gas medium torsion apparatus under anhydrous conditions to shear strains of - 4 at a constant angular velocity, a temperature of 1473 K and a confining pressure of 300MPa. The compositions of the aggregates were Fo50 and Fo70 synthesized from Fa100 and Fo90 mixture. The geometry of the samples was a cylinder with 9.4mm in diameter and 5.0mm in length encapsuled by the Ni sleeve to buffer oxygen fugacity at olivine stability field. The small element in the sample undergoes deformation at constant strain rate by simple shear. The applied shear strain rate ranged from 10-4 to 10-5 s-1, yielding shear stresses of 82 - 124 MPa supported by the sample. Microstructures were analyzed with optical and electron microscopies. A series of parallel sections were examined starting near the outside edge of the cylindrical sample and proceeding to the central section (Fig. 1). The EBSD was performed on a profile to determine the LPO changes with different strains. The LPO indicates that slip on the (010) [100] slip system dominated. This observation is consistent with the LPO reported by Bystricky et al. for samples of Fo90.

Original languageEnglish (US)
Pages (from-to)1411-1416
Number of pages6
JournalActa Petrologica Sinica
Volume24
Issue number6
StatePublished - Jun 2008

Keywords

  • Experimental study
  • Fe Olivine aggregates
  • High strain torsion
  • High temperature high pressure
  • Lattice preferred orientation (LPO)

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