The role of hydrogen in promoting Al-Si interdiffusion in albite (NaAlSi3O8) at high pressures

Details The role of hydrogen in promoting Al-Si interdiffusion in albite (NaAlSi3O8) at high pressures The role of hydrogen in promoting Al-Si interdiffusion in albite (NaAlSi3O8) at high pressures

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..80..135g&link_type=abstract

Earth and Planetary Science Letters, Volume 80, Issue 1-2, p. 135-138.

Physics

6

Scientific paper

The rate of Al/Si disorder in ``dry'' low albite is greatly enhanced at high pressures. This enhancement takes place in a P-T regime where the presence of water would induce melting; none was observed. The experimental work was carried out in piston-cylinder apparatus using NaCl pressure medium. Modification of the experimental conditions to avoid production of hydrogen by dissociation of moisture in the pressure medium, as well as to capture hydrogen with Fe2O3 and ZnO indicates that hydrogen is the active agent in promoting Al/Si diffusion at high pressures in NaAlSi3O8. A mechanism involving transient OH groups that stimulate coordinations greater than 4, simultaneously breaking Al-O and Si-O network bonds is proposed.

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