Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..36r&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 36-1, CiteID 1401, DOI 10.1029/2002GL015003
Physics
1
Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior-Composition And State (1212), Tectonophysics: Stresses-General, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction, Tectonophysics: Dynamics Of Lithosphere And Mantle-General
Scientific paper
The behavior of fayalite-the Fe2SiO4 olivine end-member (Fa100)-has been monitored during high-pressure and low-temperature experiments using in-situ x-ray synchrotron radiation, in order to investigate the effect of stress on the olivine (α-phase)-spinel (γ-phase, or ringwoodite) transition. The run products were investigated by optical and transmission electron microscopy (TEM). A low-temperature mechanism for the α-γ transformation is documented. This shear induced mechanism is operative in hydrostatically compressed samples at temperature as low as 450°C, and is driven by the shear stress generated by the volume change of the transformation itself. Projection to mantle compositions suggests that metastable subduction of olivine will not occur in the deep transition zone.
Chen Jiuhua
Raterron Paul
Weidner Donald J.
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