Kinetics of the olivine-->spinel transition: Implications to deep-focus earthquake genesis

Details Kinetics of the olivine-->spinel transition: Implications to deep-focus earthquake genesis Kinetics of the olivine-->spinel transition: Implications to deep-focus earthquake genesis

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..165s&link_type=abstract

Earth and Planetary Science Letters, Volume 32, Issue 2, p. 165-170.

Mathematics

Logic

25

Scientific paper

The rate of the olivine-->spinel transition at high overpressure increases with diminishing grain size, or increasing shear stress, temperature, and possibly pressure. The transition rate is higher in Fe-rich compositions than in Mg-rich compositions, and it can be greatly increased by adding water or other mineralizers. Of all variables controlling the kinetics of the olivine-->spinel transition in the mantle, temperature is the most critical. The olivine-->spinel transition can be suppressed below 500°C in Mg-rich compositions, even in geological period of time. Since the temperature within a downgoing slab varies greatly according to different models of calculation, it is not clear at this stage whether the temperature is low enough to suppress the olivine-->spinel transition. If the olvine-->spinel transition cannot be suppressed, it may not be responsible for the genesis of deep-focus earthquakes. However, the rise of the olivine-spinel boundary in the cold interior of downgoing slabs provides an additional driving force for the plunging of these slabs. The distortion of the olivine-spinel boundary may also control the stress distribution in downgoing slabs and may be responsible for the observed alignment of principal stress axes of deep-focus earthquakes.

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