Kinetics of iron redox reaction in silicate melts: A high temperature Xanes study on an alkali basalt | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Kinetics of iron redox reaction in silicate melts: A high temperature Xanes study on an alkali basalt

Type de publication:

Book Chapter

Source:

14th International Conference on X-Ray Absorption Fine Structure, Volume 190 (2009)

ISBN:

1742-6588

Numéro d'accès:

ISI:000275152100183

URL:

http://iopscience.iop.org/1742-6596/190/1/012182/

Mots-clés:

UMR 7154 ; Géochimie et Cosmochimie

Résumé:

In Earth and Materials sciences, iron is the most important transition element. Glass and melt properties are strongly affected by iron content and redox state, with the consequence that some properties (i. e. viscosity, heat capacity, crystallization.) depend not only on the amounts of Fe2+ and Fe3+, but also on the coordination state of these ions. In this work we investigate iron redox reactions through XANES experiments at the K-edge of iron. Using a high-temperature heating device, pre-edge of XANES spectra exhibits definite advantages to make in-situ measurements and to determine the evolution of redox state with time, temperature and composition of synthetic silicate melts. In this study, new kinetics measurements are presented for a basalt melt from the 31,000-BC eruption of the Puy de Lemptegy Volcano in France. These measurements have been made between 773 K and at superliquidus temperatures up to 1923 K.

Notes:

Cochain, B. Neuville, D. R. de Ligny, D. Roux, J. Baudelet, F. Strukelj, E. Richet, P. XAFS14 14th International Conference on X-Ray Absorption Fine Structure (XAFS14) JUL 26-31, 2009 Camerino, ITALY