An ion microprobe study of anhydrous oxygen diffusion in anorthite: a comparison with hydrothermal data and some geological implications

S.C. Elphick, Colin Graham, P.F. Dennis

Research output: Contribution to journalArticlepeer-review

Abstract

The diffusion rate of O tracer atoms in anorthite (AnAb) under anhydrous conditions has been measured using SIMS techniques. The tracer source was O 98.4% gas at 1 bar, in the temperature range 1300° C-850° C. The measured diffusion constants are D=1×10 msQ=236±8 kJ mol Comparison of these values with published data for O diffusion in anorthite under hydrothermal conditions shows that "dry" oxygen diffusivities are orders of magnitude lower than equivalent "wet" values at similar temperatures. The effect of these differences on oxygen isotope equilibration during cooling is discussed.
Original languageEnglish
Pages (from-to)490-495
Number of pages6
JournalContributions to Mineralogy and Petrology
Volume100
Issue number4
DOIs
Publication statusPublished - 1 Dec 1988

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