Oxygen diffusion in anhydrous sanidine feldspar

Dagma Derdau; Robert Freer; Kate Wright

doi:10.1007/s004100050447

Oxygen diffusion in anhydrous sanidine feldspar

Dagma Derdau, Robert Freer, Kate Wright

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Oxygen exchange experiments have been performed between single crystals of sanidine feldspar and oxygen gas enriched in ¹⁸O, at temperatures in the range 869-1053°C, total pressure 1 atmosphere, for times up to 28 days. Oxygen isotope diffusion profiles in a direction perpendicular to (001) were determined with an ion microprobe. The experimental data obey a single Arrhenius relationship of the form D = 8.4 × 10^-11 exp. (-245 ± 15 kJ mol^-1/RT) m²s^-1. The results indicate that oxygen diffusion in anhydrous sanidine feldspar is marginally slower than oxygen diffusion in anhydrous anorthite. Comparison with published atomistic simulation studies suggests that oxygen transport in feldspar is by an interstitial mechanism.

Original language	English
Pages (from-to)	199-204
Number of pages	6
Journal	Contributions to Mineralogy and Petrology
Volume	133
Issue number	1-2
DOIs	https://doi.org/10.1007/s004100050447
Publication status	Published - 1 Jan 1998
Externally published	Yes

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title = "Oxygen diffusion in anhydrous sanidine feldspar",

abstract = "Oxygen exchange experiments have been performed between single crystals of sanidine feldspar and oxygen gas enriched in 18O, at temperatures in the range 869-1053°C, total pressure 1 atmosphere, for times up to 28 days. Oxygen isotope diffusion profiles in a direction perpendicular to (001) were determined with an ion microprobe. The experimental data obey a single Arrhenius relationship of the form D = 8.4 × 10-11 exp. (-245 ± 15 kJ mol-1/RT) m2s-1. The results indicate that oxygen diffusion in anhydrous sanidine feldspar is marginally slower than oxygen diffusion in anhydrous anorthite. Comparison with published atomistic simulation studies suggests that oxygen transport in feldspar is by an interstitial mechanism.",

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AU - Derdau, Dagma

AU - Freer, Robert

AU - Wright, Kate

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N2 - Oxygen exchange experiments have been performed between single crystals of sanidine feldspar and oxygen gas enriched in 18O, at temperatures in the range 869-1053°C, total pressure 1 atmosphere, for times up to 28 days. Oxygen isotope diffusion profiles in a direction perpendicular to (001) were determined with an ion microprobe. The experimental data obey a single Arrhenius relationship of the form D = 8.4 × 10-11 exp. (-245 ± 15 kJ mol-1/RT) m2s-1. The results indicate that oxygen diffusion in anhydrous sanidine feldspar is marginally slower than oxygen diffusion in anhydrous anorthite. Comparison with published atomistic simulation studies suggests that oxygen transport in feldspar is by an interstitial mechanism.

AB - Oxygen exchange experiments have been performed between single crystals of sanidine feldspar and oxygen gas enriched in 18O, at temperatures in the range 869-1053°C, total pressure 1 atmosphere, for times up to 28 days. Oxygen isotope diffusion profiles in a direction perpendicular to (001) were determined with an ion microprobe. The experimental data obey a single Arrhenius relationship of the form D = 8.4 × 10-11 exp. (-245 ± 15 kJ mol-1/RT) m2s-1. The results indicate that oxygen diffusion in anhydrous sanidine feldspar is marginally slower than oxygen diffusion in anhydrous anorthite. Comparison with published atomistic simulation studies suggests that oxygen transport in feldspar is by an interstitial mechanism.

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Oxygen diffusion in anhydrous sanidine feldspar

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