Fe2+-Mg interdiffusion in orthopyroxene

retrieval from the data on intracrystalline exchange reaction

Jibamitra Ganguly, V. Tazzoli

Research output: Contribution to journalArticle

140 Citations (Scopus)

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 - 1994

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orthopyroxene
retrieval
Order disorder transitions
Fractionation
crystal structure
fractionation
reaction rate
Reaction rates
Rate constants
reaction kinetics
disorders
crystal
formulations
kinetics
Crystals
Kinetics
coefficients
crystals
Direction compound
distribution

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Fe2+-Mg interdiffusion in orthopyroxene : retrieval from the data on intracrystalline exchange reaction. / Ganguly, Jibamitra; Tazzoli, V.

In: American Mineralogist, Vol. 79, No. 9-10, 1994, p. 930-937.

Research output: Contribution to journalArticle

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