A volume equation of state that extends thermodynamic datasets, using the Bridgman Power Series, to very high pressures (20 GPa)

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ID: 308496
2016
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Abstract
Thermodynamic datasets are essential for phase equilibrium computations, from which metamorphic pressure and temperature conditions of rocks can be estimated. In addition, they are used to model rock properties such as volume or density. The theoretical framework for thermodynamic volume modeling is imposed by the equation of state (EOS), which can be represented using many possible formulations. Until the 19909s, the Bridgman Power Series was a popular approach to model mineral volumes. Many experiments were fitted to this equation and input parameters for almost every mineral exist. Unfortunately, the equation has a drawback and does not allow the extrapolation of mineral volumes to pressures above 1 GPa. In this paper, an inverted EOS is introduced which uses the same input parameters as the Bridgman Power Series. Converting the fit parameters of the Bridgman Power Series to commonly used physical input parameters at reference conditions (κ~00~, κ′~00~, and α~00~, α′~00~) allows extrapolation of mineral volumes to very high pressure (20 GPa). The results from this study show in detail how the extended EOS improves the volumes of solid mineral phases such as coesite, jadeite and forsterite above 1 GPa, while retaining consistent volumes at low pressure temperature conditions. In this manner, the extended EOS also improves the phase equilibrium computations of the thermodynamic datasets built on the Bridgman Power Series. The proposed inverted EOS could be easily implemented by thermodynamic software packages with no modification of the dataset because the same input parameters are used.
Reference Key
openalex_W2471417416 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Erik Duesterhoeft
Journal american journal of science
Year 2016
DOI
10.2475/06.2016.03
URL
https://doi.org/10.2475/06.2016.03
Keywords Keywords not found

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