Mechanisms and rates of quartz dissolution in melts in the CMAS (CaO?MgO?Al2O3?SiO2) system

The dissolution rate of minerals in silicate melts is generally assumed to be a function of the rate of mass transport of the released cations in the solvent. While this appears to be the case in moderately to highly viscous solvents, there is some evidence that the rate-controlling step may be diff...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2004-10, Vol.148 (2), p.180-200
Main Author: Shaw, Cliff S. J.
Format: Article
Language:English
Subjects:
Cations
Dissolution
Experiments
Heating
Mass transport
Mineralogy
Petrology
Quartz
Silica
Solvents
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Summary:The dissolution rate of minerals in silicate melts is generally assumed to be a function of the rate of mass transport of the released cations in the solvent. While this appears to be the case in moderately to highly viscous solvents, there is some evidence that the rate-controlling step may be different in very fluid, highly silica undersaturated melts such as basanites. In this study, convection-free experiments using solvent melts with silica activity from 0.185-0.56 and viscosity from 0.03-4.6 Pa s show that the dissolution rate is strongly dependent on the degree of superheating, silica activity and the viscosity of the solvent. Dissolution rates increase with increasing melt temperature and decreasing silica activity and viscosity. Quartz dissolution in melts with viscosity
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-004-0581-3