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Mineralogical Magazine; October 1999; v. 63; no. 5; p. 673-686
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High-temperature diffusion of oxygen in synthetic diopside measured by nuclear reaction analysis

L. Pacaud, J. Ingrin, and O. Jaoul

CNRS, Laboratoire d'Etude des Mecanismes de Transfert en Geologie, Toulouse, France

We have performed O self-diffusion experiments in synthetic diopside single crystals along the b-axis at temperatures ranging from 1473-1643 K, under controlled O partial pressure (10 (super -11) -10 (super -2) atm). The 18 O tracer diffusion was imposed by solid/gas exchange between 16 O in diopside and 18 O 2 -enriched argon-hydrogen-H 2 O gas mixture. Diffusion profiles of 18 O were measured by Nuclear Reaction Analysis 18 O (p,alpha ) 15 N. The diffusion coefficients are described by D = D 0 exp (-E/RT), with log D 0 (m 2 /s) = -9.2+ or -1.0 and E = 310+ or -30 kJ/mol. Our results are in agreement with Ryerson and McKeegan's (1994) data and Farver's (1989) data along a direction perpendicular to the c direction. Experiments performed in a wide pO 2 range show that D is independent of pO 2 . We observe no change in the diffusion regime up to 1643 K (i.e. 22 K prior to melting temperature). This result differs from the diffusion study of Ca in diopside by Dimanov and Ingrin (1995), where a strong enhancement of Ca mobility, attributed to an excess disorder in the Ca-sublattice, was observed above 1523 K. We conclude that O diffusion in diopside is not affected by this premelting phenomenon.

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