Catalysis of the Olivine to Spinel Transformation by High Clinoenstatite

Details Catalysis of the Olivine to Spinel Transformation by High Clinoenstatite Catalysis of the Olivine to Spinel Transformation by High Clinoenstatite

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...269.1095s&link_type=abstract

Science, Volume 269, Issue 5227, pp. 1095-1098

Physics

7

Scientific paper

Although enstatite is a major constituent of the Earth's upper mantle and subducting lithosphere, most kinetic studies of olivine phase transformations have typically involved single-phase polycrystalline aggregates. Transmission electron microscopy investigations of olivine to spinel and modified spinel (β phase) reactions in the (Mg,Fe)_2SiO_4-(Mg,Fe)SiO_3 system show that transformation of olivine in the stability field of spinel plus β phase begins with coherent nucleation of spinel on high-clinoenstatite grains. These observations demonstrate that high clinoenstatite can catalyze the transformation by enhancing nucleation kinetics and therefore imply that secondary phases can influence reaction kinetics during high-pressure mineral transformations.

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