HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ghiorso, M. S. Search for Related Content Articles by Ghiorso, M. S. GeoRef GeoRef Citation

An equation of state for silicate melts. IV. Calibration of a multicomponent mixing model to 40 GPa

Department of Geophysical Sciences, The University of Chicago,5723 S. Ellis Avenue, Chicago, Illinois 60637

ghiorso{at}geosci.uchicago.edu

Mixing relations for the "high-pressure" parameters of the equation of state of Ghiorso (2004a) are developed and compositional coefficients are optimized to permit calculation of melt density in portions of the system SiO₂-TiO₂-Al₂O₃-FeO-MgO-CaO-Na₂O-K₂O to pressures in excess of 40 GPa and temperatures up to 2500°C. Four data sets are analyzed and fitted to yield an internally consistent model: (1) density estimates made from measurements of the sinking/floating of reference mineral markers in silicate liquids at known temperatures and pressures, (2) density estimates obtained from shock compression studies on molten liquids, (3) liquid densities inferred from the temperature and pressure dependence of the slopes of mineral fusion curves, and (4) estimates of densities of molten silicate liquids obtained by molecular dynamics simulations. Calibration compositions include chemically complex liquids (komatiite, peridotite and MORB bulk compostions) as well as simple liquids with mineral-like stoichiometry. The model recovers density with an average error of 2 percent. The model is limited by not including the effects of volatiles or oxidized iron at elevated pressure.

This article has been cited by other articles:

				G. S. Henderson, G. Calas, and J. F. Stebbins The Structure of Silicate Glasses and Melts Elements, October 1, 2006; 2(5): 269 - 273. [Abstract] [Full Text] [PDF]

				M. S. Ghiorso and V. C. Kress An equation of state for silicate melts. II. Calibration of volumetric properties at 105 Pa Am J Sci, October 1, 2004; 304(8-9): 679 - 751. [Abstract] [Full Text] [PDF]

				M. S. Ghiorso An equation of state for silicate melts. III. Analysis of stoichiometric liquids at elevated pressure: shock compression data, molecular dynamics simulations and mineral fusion curves Am J Sci, October 1, 2004; 304(8-9): 752 - 810. [Abstract] [Full Text] [PDF]