Details

Autor(en) / Beteiligte

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

Titel

Experimental Investigation of the Creep Behavior of Garnet at High Temperatures and Pressures

Ist Teil von

• Journal of earth science (Wuhan, China), 2010-10, Vol.21 (5), p.532-540

Ort / Verlag

China University of Geosciences: China University of Geosciences

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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^- 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.