Low-temperature olivine rheology at high pressure

Details Low-temperature olivine rheology at high pressure Low-temperature olivine rheology at high pressure

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..145..149r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 145, Issue 1-4, p. 149-159.

Physics

23

Scientific paper

San-Carlos olivine rheology was investigated at pressure (P) up to 9GPa 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: ɛ˙ (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 ɛ˙ 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.

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