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Anomalous rheology of peraluminous melts

Mineralogy Department, GZG, Georg-August-University of Göttingen, Germany

Correspondence: ^* E-mail: swebb{at}gwdg.de

The viscosity of peraluminous Na₂O-Al₂O₃-SiO₂ melts of constant SiO₂ content is essentially independent of Al₂O₃ content. The addition of more Al³⁺ to the peraluminous melts does not result in a decrease in viscosity. This finding indicates that the Al³⁺ in these melts does not enter the structure as a viscosity reducing network-modifier. The most probable charge-balanced structural unit in these melts is a tri-cluster that involves one Al-tetrahedron sharing an O atom with two Si-tetrahedra. Both viscosity and activation energy for viscous flow in the investigated viscosity range in these peraluminous melts are largely unaffected by the Al³⁺ content, indicating that increasing the proportion of tri-clusters does not significantly affect the mechanism of viscous flow. Comparison of data for melts of different SiO₂ contents shows that the viscosity of melts in the Na₂O-Al₂O₃-SiO₂ system form the same trend ±1 log₁₀ unit as a function of Na:Al ratio within the 10⁸–10¹⁴ Pa·s range.

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