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- W2163673065 abstract "The structure of melts in the composition join Na2Si2O5-NaaAlzOs has been evaluated by Raman spectroscopy of melts quenched at 1 atm from 1600'C, at 30 kbar quenched from 1600'C, and at 30 kbar quenched from 1400C. The Al3+ is in tetrahedral coordination. Under all conditions, this tetrahedrally coordinated Al3+ displays strong preference for three-dimensional units in the melts. The relative abundance of three-dimensional network units increases, therefore, with increasing Al/(Al+Si) of the melt even though its bulk NBO/T is unchanged (NBO/T, nonbridging oxygen per tetrahedrally coordinated cation). This increase is compensated for by an increase in the relative abundance of anionic units with NBO/T > 2. The proportion of units with NBO/T = I decreases. These efects become more pronounced with increasing pressure at the same temperature. For basaltic liquids with similar NBO/T and A1/(Al+Si) the type of charge-balancing cation for tetrahedrally coordinated Al3+ and the types of network-modiffing metal cations control the relative importance of feldspar and olivine on the liquidus at 1 atm. Increasing M+/(M++M2*) results in an increase in the relative abundance of three-dimensional aluminosilicate units and a decrease in SiOX- units in the liquid. Thus, the liquidus volume of three-dimensional aluminosilicate minerals (feldspar) will increase as the alkali/alkaline earth increases. This trend is borne out by experimental phase-equilibrium measurements at I atm on natural rock compositions." @default.
- W2163673065 created "2016-06-24" @default.
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- W2163673065 date "1985-01-01" @default.
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- W2163673065 title "Relationships between properties and structure of aluminosilicate melts" @default.
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