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A thermodynamic model for polymerized sodium aluminosilicate melts

Alexander G. Simakin, Vladimir O. Zavel'sky, Harald Behrens, Jaroslav Kucherinenko and Tamara Salova
A thermodynamic model for polymerized sodium aluminosilicate melts (in EMPG X; Experimental mineralogy, petrology and geochemistry, A. B. Woodland (editor) and S. F. Foley (editor))
European Journal of Mineralogy (April 2005) 17 (2): 243-250


A simplified thermodynamic model is proposed assuming nepheline-like and tridymite-like structural units being major constituents of polymerized aluminosilicate melts. In the frame of the model, dissolution of albite in the melt can be described by the dissociation reaction Ab (super L) = Ne (super L) + Q (super L) . Static (super 23) Na NMR spectra recorded for glasses along the binary join Ab-Q are consistent with the proposed structural units. The NMR spectra can be broken into two mixed (Lorentzian + Gaussian) components. The narrow line is comparable in chemical shift and width with the symmetric position of sodium in crystalline nepheline. The second much broader line is assigned to a more asymmetric albite-like environment. The proportion of both sites estimated fom static NMR for glasses of the dry Ab-Q binary are close to the calculated proportion in the melt at the glass transition. Using the new thermodynamic model, the liquidus of silica polymorphs in the system Ab-Q can be described well by assuming non-ideal mixing of structural units in the melt with small interaction parameters.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 17
Serial Issue: 2
Title: A thermodynamic model for polymerized sodium aluminosilicate melts
Title: EMPG X; Experimental mineralogy, petrology and geochemistry
Author(s): Simakin, Alexander G.Zavel'sky, Vladimir O.Behrens, HaraldKucherinenko, JaroslavSalova, Tamara
Author(s): Woodland, A. B.editor
Author(s): Foley, S. F.editor
Affiliation: Russian Academy of Sciences, Institute of Experimental Mineralogy, Chernogolovka, Russian Federation
Pages: 243-250
Published: 200504
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: 10th international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Frankfurt, DEU, Federal Republic of Germany
Meeting date: 20040404April 4-7, 2004
References: 52
Accession Number: 2005-041698
Categories: General geochemistry
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. table
Secondary Affiliation: Universitaet Hannover, DEU, Federal Republic of GermanyMoscow University, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200525
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