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PII S0016-7037(98)00172-0 Determination of the partial molar volume of SiO2 in silicate liquids
 

Summary: PII S0016-7037(98)00172-0
Determination of the partial molar volume of SiO2 in silicate liquids
at elevated pressures and temperatures: A new experimental approach
GLENN A. GAETANI,* PAUL D. ASIMOW,
and EDWARD M. STOLPER
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA
(Received August 4, 1997; accepted in revised form April 20, 1998)
Abstract--This study presents a new approach for determining the partial molar volume and its pressure
derivative for a silicate liquid component through an experimental determination of the isothermal pressure
dependence of the solubility in the liquid of a crystalline phase having the composition of the component.
Because this approach allows the determination of partial molar volumes of liquid components at elevated
pressure, it has the potential to detect pressure-induced structural changes associated with particular compo-
nents in silicate liquid through their influence on partial molar volumes. To illustrate the approach, an
experimental determination of the solubility of quartz in a rhyolitic liquid was used to determine the partial
molar volume of SiO2 at pressures up to 35 kbar and a temperature of 1350C. The 1 bar partial molar volume
for SiO2 determined in this way, 2.635 0.009 J/bar, is slightly smaller than the 2.690 0.006 J/bar
determined by Lange and Carmichael (1987) (all uncertainties are 1 ). The isothermal pressure dependence
of the partial molar volume of SiO2 at 10 to 35 kbar ( 8.69 10 6
6.1 10 7
J/bar2

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences