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

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doi: 10.1016/0012-821X(86)90026-9
Authors:Goldsmith, Julian R.
Author Affiliations:Primary:
Univ. Chicago, Dep. Geophys. Sci., Chicago, IL, United States
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 80(1-2), p.135-138. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1986
Note:In English. 15 refs.; illus. incl. 1 table
Summary:The rate of Al/Si disorder in 'dry' low albite is greatly enhanced at high P. This enhancement occurs in a P-T regime where the presence of water would induce melting; none was observed. This experimental work was done in a piston-cylinder apparatus, using a NaCl pressure medium. Modifications of the experimental conditions to avoid production of H2 by dissociation of moisture in the P medium, and to capture H2, with Fe2O3 and ZnO indicate that H2 is the active agent in promoting Al/Si diffusion at high P 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. [P.Br.]
Subjects:Albite; Aluminosilicates; Aluminum; Bonding; Crystal chemistry; Diffusion; Experimental studies; Feldspar group; Framework silicates; Geochemistry; High pressure; Hydrogen; Metals; Minerals; Natural materials; Order-disorder; Phase equilibria; Plagioclase; Pressure; Silicates; Silicon
Abstract Numbers:87M/2561
Record ID:1987039042
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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