An experimental study of the diffusion of oxygen in quartz and albite using an overgrowth technique

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

Research output: Contribution to journalArticlepeer-review

Abstract

Diffusion rates ofO tracer in quartz (∥ c, 1 Kb HO) and Amelia albite (⊥ 001, 2 Kb HO) have been measured, using Secondary Ion Mass Spectrometry (SIMS). A new technique involving hydrothermal deposition of labelled materials has removed the possibility of pressure solution-reprecipitation processes adversely affecting the experiments. Reported diffusion constants are:β-quartz (∥ c), {Mathematical expression}, Q=98±7 KJ mol (600-825° C, 1 Kb); Amelia albite (⊥ 001), {Mathematical expression}, Q=85±7 KJ mol, (400-600° C, 2 Kb). Measured quartzO diffusivities decrease discontinuously at the α-β transition, reflecting strong structural influences. The reported albite data agree with previously recorded studies, but β-quartz data indicate significantly lower activation energies. Possible causes of this discrepancy, and some geological consequences, are noted.
Original languageEnglish
Pages (from-to)322-330
Number of pages9
JournalContributions to Mineralogy and Petrology
Volume92
Issue number3
DOIs
Publication statusPublished - 1 Sep 1986

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