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The Role of High Field Strength Cations in Silicate Melts

  • Paul C. Hess
Part of the Advances in Physical Geochemistry book series (PHYSICAL GEOCHE, volume 9)

Abstract

Early models of melt structure focused almost exclusively on the role of the polymerized aluminosilicate tetrahedral framework. Solubility relations, trace element partitioning patterns, redox equilibria and the occurrence of liquid immiscibility among other properties were explained in the following way. A highly polymerized melt is a relatively inflexible structure with few non-bridging oxygen. High field strength cations cannot substitute into the tetrahedrally coordinated structure (TO), and have difficulty in achieving coordination polyhedra of oxygen within the network. This difficulty limits the solubility of the cations whose addition leads eventually to crystallization or to silicate liquid immiscibility.

Keywords

Silicate Glass Silicate Liquid Rare Earth Element Redox Ratio Homogeneous Equilibrium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag New York Inc. 1991

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  • Paul C. Hess

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