Catalysis of the olivine to spinel transformation by high clinoenstatite

T. G. Sharp, D. C. Rubie

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

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)2SiO4-(Mg,Fe) SiO3 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.

Original languageEnglish (US)
Pages (from-to)1095-1098
Number of pages4
JournalScience
Volume269
Issue number5227
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • General

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