Gaetani, Glenn A, and Asimow, Paul D. and Stolper, Edward M. (1998) Determination of the partial molar volume of SiO_2 in silicate liquids at elevated pressures and temperatures: A new experimental approach. Geochimica et Cosmochimica Acta, 62 (14). pp. 2499-2508. ISSN 0016-7037 http://resolver.caltech.edu/CaltechAUTHORS:20120823-104105677
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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 components 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 SiO_2 at pressures up to 35 kbar and a temperature of 1350°C. The 1 bar partial molar volume for SiO_2 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 1σ). The isothermal pressure dependence of the partial molar volume of SiO_2 at 10 to 35 kbar (−8.69 × 10^(−6) ± 6.1 × 10^(−7) J/bar^2) is approximately one-half of the value determined by Kress and Carmichael (1991) at 1 bar (−1.96 × 10^(−5) ± 0.2 × 10^(−6) J/bar^2). Our high pressure determination can be reconciled with the existing 1 bar volume and compressibility data if the isothermal pressure dependence of the partial molar volume of SiO_2 in silicate liquids decreases rapidly between 1 bar and 10 kbar, then remains approximately constant to at least 35 kbar.
|Additional Information:||© 1998 Elsevier Science Ltd. Received 4 August 1997. Revised 20 April 1998. Accepted 20 April 1998. Available online 21 November 1998. The authors thank R. Lange, A. Navrotsky, and an anonymous referee for helpful reviews. The comments of Y. Bottinga and T. Grove are also gratefully acknowledged. The authors thank S. Newman for performing FTIR analyses of Glass Buttes rhyolite. This research was supported by DOE grant DE-FG03-85ER13445, by NSF grant EAR-9725461, and by an O. K. Earl prize postdoctoral fellowship (to GG) from the Division of Geological and Planetary Sciences at the California Institute of Technology. Caltech Division of Geological and Planetary Sciences Contribution 5707.|
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|Official Citation:||Glenn A. Gaetani, Paul D. Asimow, Edward M. Stolper, Determination of the partial molar volume of SiO2 in silicate liquids at elevated pressures and temperatures: a new experimental approach, Geochimica et Cosmochimica Acta, Volume 62, Issue 14, July 1998, Pages 2499-2508, ISSN 0016-7037, 10.1016/S0016-7037(98)00172-0. (http://www.sciencedirect.com/science/article/pii/S0016703798001720)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||23 Aug 2012 20:07|
|Last Modified:||23 Aug 2012 20:07|
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