Low-temperature olivine rheology at high pressure Article

Raterron, P, Wu, Y, Weidner, DJ et al. (2004). Low-temperature olivine rheology at high pressure . PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 145(1-4), 149-159. 10.1016/j.pepi.2004.03.007

cited authors

  • Raterron, P; Wu, Y; Weidner, DJ; Chen, J

authors

abstract

  • San-Carlos olivine rheology was investigated at pressure (P) up to 9 GPa and temperature (T) lower than 890 °C. Six powder specimens were cold compressed and sintered into dense and compact materials, then deformed during relaxation experiments carried out at constant pressure and temperature in DIA-type cubic-anvil apparatus. Sample elastic strain was monitored during relaxation by in situ X-ray diffraction. Run product microstructures were characterized by transmission electron microscopy (TEM). A new method for measuring olivine rheology at high pressure from X-ray diffraction peak broadening is documented. From the data collected between 500 and 740 °C, the following rheological law is obtained: ε̇ (s-1)=2.6 (+23/-2.3) ×1016 ×exp {- (564±89 ×103/ RT(J/mol) [1-(σ(GPa)/15.4±1.0 2/3]2}, where ε̇ and σ are respectively the olivine microscopic plastic strain rate and internal stress, and R is the gas constant. TEM investigation of deformed sample microstructures reveals that this law corresponds to the activation of c-dislocation glide, and is thus representative of the olivine low-temperature dislocation-creep regime at high pressure. © 2004 Elsevier B.V. All rights reserved.

publication date

  • July 30, 2004

published in

Digital Object Identifier (DOI)

start page

  • 149

end page

  • 159

volume

  • 145

issue

  • 1-4