Computer Science
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...274...79k&link_type=abstract
Science, Volume 274, Issue 5284, pp. 79-81
Computer Science
41
Scientific paper
Experiments on Mg1.8Fe0.2SiO_4 olivine at 18 to 20 gigapascals and 1000^circ to 1400^circC show that transformation to the high-pressure polymorphs wadsleyite and ringwoodite involves two competing nucleation mechanisms when the grain size of the olivine is large: (i) incoherent nucleation on olivine grain boundaries and (ii) coherent intracrystalline nucleation of ringwoodite lamellae on shear-induced stacking faults in olivine on the (100) planes, followed by the nucleation of wadsleyite on the ringwoodite. The large amount of intracrystalline transformation, which occurs under low differential stress under the pressure and temperature conditions of the mantle transition zone, suggests that shear-induced intracrystalline transformation of olivine to wadsleyite and ringwoodite is important in subducting slabs.
Kerschhofer Ljuba
Rubie David C.
Sharp Thomas G.
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