Fe2+-Mg interdiffusion in orthopyroxene: retrieval from the data on intracrystalline exchange reaction

J. Ganguly, V. Tazzoli

Research output: Contribution to journalArticle

144 Scopus citations

Abstract

Crystal structural data of orthopyroxene suggest that Fe-Mg interdiffusion should be fastest along the c axis and slowest along the a axis and that the overall kinetics of the Fe2+-Mg fractionation, or order-disorder, between the M1 and M2 sites should be dominated by exchange along the c and b directions. Using these crystallographic constraints and a formulation of the diffusion process according to absolute reaction rate theory, an expression of the average Fe2+-Mg interdiffusion coefficient along the c and b directions of orthopyroxene in terms of the rate constant of the disordering process the equilibrium intracrystalline distribution of Fe2+ and Mg, and the average distance between the neighboring M1 and M2 sites along c and b is developed. -from Authors

Original languageEnglish (US)
Pages (from-to)930-937
Number of pages8
JournalAmerican Mineralogist
Volume79
Issue number9-10
StatePublished - Jan 1 1994

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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