Experimental investigation of the creep behavior of garnet at high temperatures and pressures

Shenghua Mei, Ayako M. Suzuki, David L. Kohlstedt, Lili Xu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

To provide constraints on the rheological properties of garnet, we have experimentally investigated the creep behavior of garnet at high pressures and temperatures using a deformation-DIA. Samples were cold-pressed from a garnet powder and deformed at constant displacement rates ranging from 1.1×10-5 to 2.6×10-5 s-1 at high temperatures (1 273-1 473 K) and high pressures (2.4-4.1 GPa). Differential stress and pressure were measured using X-ray diffraction techniques based on the elastic strain of various lattice planes as a function of orientation with respect to the applied stress field. The plastic strain of a deforming sample was monitored in-situ through a series of radiographs. Our results provide a measure of the dependence of creep rate of garnet on the temperature with an activation energy of ~280 kJ/mol and on pressure with an activation volume of ~10×10-6 m3/mol. The flow behavior of garnet quantified by this study provides the basis for modeling geodynamic processes occurring within subducted lithosphere.

Original languageEnglish (US)
Pages (from-to)532-540
Number of pages9
JournalJournal of Earth Science
Volume21
Issue number5
DOIs
StatePublished - Oct 1 2010

Keywords

  • creep
  • garnet
  • geodynamics
  • high pressure
  • lithosphere

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