Abstract
26Mg tracer diffusion coefficients were determined in single crystals of pure synthetic forsterite (Mg2SiO4). Isotopically enriched powder sources both acted as the 26Mg source and buffered the activities of silica
Mg tracer diffusion is anisotropic, with D[001] > D[010] > D[100], the difference in diffusion coefficients varying by about one order of magnitude at a given temperature with crystallographic orientation. Diffusion is faster in protoenstatite-buffered than periclase-buffered conditions, again with around one order of magnitude difference in diffusivity between buffering conditions. There is no apparent effect of
where log10D0 is –3.15 (±0.08), –3.61 (±0.02), and –4.01 (± 0.05) m2 s–1 for the [001], [010], and [100] directions, respectively (1 s.d.). The LA-ICP-MS technique reproduces diffusion coefficients determined by SHRIMP-RG, albeit with slightly different absolute values of isotope ratios. This shows that LA-ICP-MS, which is both accessible and rapid, is a robust analytical method for such tracer diffusion studies.
Acknowledgments
Trevor Ireland, Peter Holden, Morgan Williams, Laure Gauthiez-Putallaz, and Mari-Rosa Schiccitano are thanked for help with various aspects of SHRIMP analyses. Joshua Muir, Andrew Walker, Othmar Müntener, Elias Bloch, Jung-Woo Park, Carl Mitchell, Dave Clark, and Dean Scott are acknowledged for various assistance and useful discussions. Daniele Cherniak and an anonymous reviewer are thanked for reviews that helped to strengthen the manuscript.
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