Comment on "Density calculations for silicate liquids. I. Revised method for aluminosilicate compositions" by Bottinga, Weill and Richet

Details Comment on "Density calculations for silicate liquids. I. Revised method for aluminosilicate compositions" by Bottinga, Weill and Richet Comment on "Density calculations for silicate liquids. I. Revised method for aluminosilicate compositions" by Bottinga, Weill and Richet

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..401g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 2, pp.401-408

Computer Science

2

Scientific paper

Using density measurements on liquids in the systems Al 2 O 3 -SiO 2 , Na 2 O-Al 2 O 3 -SiO 2 , MgO-Al 2 O 3 -SiO 2 and CaO-Al 2 O 3 -SiO 2 the compositional dependence of the apparent partial molar volume of alumina ( ) in multicomponent silicate liquids is critically examined. These data do not support the recent suggestion of et al. (1982) that should be expressed as a linear function of composition. Thermodynamic analysis of the derivation of el al. 's (1982) model for molar volumes in aluminumbearing multicomponent silicate liquids reveals that their comprehensive equation (no. 21) has been improperly formulated, and statistical considerations indicate that bias was introduced in calibrating the model parameters which appear in this equation. Our analysis suggests that a much simpler formulation, which does not incorporate non-zero volume of mixing terms, adequately reproduces the available data on the densities of multicomponent silicate liquids (including magmas) to within the limits of measurement.

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