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Oxygen Fugacity at High Pressure: Equations of State of Metal-Oxide PairsOxygen fugacity (fO2) varies by orders of magnitude in nature, and can induce profound changes in the chemical state of a substance, and also in the chemical equilibrium of multicomponent systems. One prominent area in high pressure geochemistry, in which fO2 is widely recognized as a principal controlling factor, is that of metal-silicate partitioning of siderophile trace elements (e.g., [1]). Numerous experiments have shown that high pressures and temperatures can significantly affect metal/silicate partitioning of siderophile and moderately siderophile elements. Parameterization of these experimental results over P, T, X, and fO2 can allow the observed siderophile element composition of the mantle to be associated with particular thermodynamic conditions [2]. However, this is best done only if quantitative control exists over each thermodynamic variable relevant to the experiments. The fO2 values for many of these partitioning experiments were determined relative to a particular metal-oxide buffer (e.g., Fe-FeO (IW), Ni-NiO (NNO), Co-CoO, Re-ReO2 (RRO)), but the parameterization of all experimental results is weakened by the fact that the pressure-induced relative changes between these buffer systems are imprecisely known.
Document ID
20080029367
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Campbell A. J. (Maryland Univ. College Park, MD, United States)
Danielson, L. (NASA Johnson Space Center Houston, TX, United States)
Righter, K. (NASA Johnson Space Center Houston, TX, United States)
Wang, Y. (Chicago Univ. Argonne, IL, United States)
Davidson, G. (Maryland Univ. College Park, MD, United States)
Wang, Y. (Chicago Univ. Argonne, IL, United States)
Date Acquired
August 24, 2013
Publication Date
March 13, 2006
Subject Category
Metals And Metallic Materials
Meeting Information
Meeting: 37th Lunar and Planetary Science Conference
Location: Houston, TX
Country: United States
Start Date: March 13, 2006
End Date: March 17, 2006
Distribution Limits
Public
Copyright
Public Use Permitted.

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