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The partial molar volume of Fe2O3 in multicomponent silicate liquids and the pressure dependence of oxygen fugacity in magmas

Published online by Cambridge University Press:  05 July 2018

X. Mo ,
I. S. E. Carmichael ,
M. Rivers  and
J. Stebbins
X. Mo
Affiliation:
Lawrence Berkeley Laboratory, Department of Geology and Geophysics, University of California, Berkeley, California 94720 USA
I. S. E. Carmichael
Affiliation:
Lawrence Berkeley Laboratory, Department of Geology and Geophysics, University of California, Berkeley, California 94720 USA
M. Rivers
Affiliation:
Lawrence Berkeley Laboratory, Department of Geology and Geophysics, University of California, Berkeley, California 94720 USA
J. Stebbins
Affiliation:
Lawrence Berkeley Laboratory, Department of Geology and Geophysics, University of California, Berkeley, California 94720 USA
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Abstract

Density measurements of eight silicate liquids containing substantial amounts of Fe2O3 have been made over a range of 250 °C. These have been combined with published density measurements on multicomponent silicate liquids to yield (by multiple regression) partial molar volumes of SiO2, TiO2, Al2O3, Fe2O3, FeO, MgO, CaO, Na2O, and K2O. The data on Fe2O3-liquids are neither precise nor abundant enough to show a compositional dependence of . In a liquid of constant composition and temperature, the pressure dependence of the oxygen fugacity is given by

which, if ΔV is independent of pressure, necessitates an increase in fO2 with increasing pressure of about 1 log10 unit for 10 kbars.

Combining an equation relating oxygen fugacity to composition, T, and Fe2O3 at 1 bar (Sack et al., 1980) with the results for partial molar volumes, the oxygen fugacity of any magma can be calculated as a function of P and T. If basic magmas have their Fe2O3/FeO set in the source regions, and ascend isochemically, then the calculated oxygen fugacities in the mantle increase as pressure increases and silica activity decreases. A P-T grid has been constructed to show the calculated oxygen fugacities in a source region which has equilibrated with some common lava types, based on their FeO and Fe2O3 contents.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 237 - 245
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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Footnotes

*

Permanent address: Beijing College of Geology, Beijing, China.

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