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Commentary on “Constraints on the Equations of State of stiff anisotropic minerals: rutile, and the implications for rutile elastic barometry” [Miner. Mag. 83 (2019) pp. 339–347]

Published online by Cambridge University Press:  18 March 2020

Ross J. Angel Open the ORCID record for Ross J. Angel [Opens in a new window] ,
Matteo Alvaro Open the ORCID record for Matteo Alvaro [Opens in a new window] ,
Peter Schmid-Beurmann  and
Herbert Kroll
Ross J. Angel*
Affiliation:
Istituto di Geoscienze e Georisorse, CNR, Via Giovanni Gradenigo, 6, I-35131Padova, Italy
Matteo Alvaro
Affiliation:
Department of Earth and Environmental Sciences, University of Pavia, Via A. Ferrata 1, I-27100, Pavia, Italy
Peter Schmid-Beurmann
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, D-48149 Münster, Germany
Herbert Kroll
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, D-48149 Münster, Germany
*
*Author for correspondence: Ross J. Angel, Email: [email protected]
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Abstract

The conclusion of Zaffiro et al. (2019; Constraints on the Equations of State of stiff anisotropic minerals: rutile, and the implications for rutile elastic barometry. Mineralogical Magazine, 83, 339–347) that the Mie–Grüneisen–Debye (MGD) Equation of State (EoS) cannot fit the available data for rutile is shown to be incorrect, even though rutile exhibits significant anisotropic thermal pressure which invalidates the quasi-harmonic approximation used as the basis for the MGD EoS. The refined parameters for the MGD EoS of rutile are: KTR0= 205.05(25) GPa, $K_{TR0}^{\prime} $ = 7.2(5), θD = 399(20) K, γ0= 1.40(2) and q = 1.5(7). This EoS predicts volumes, bulk moduli and volume thermal expansion coefficients for rutile at metamorphic conditions that are statistically indistinguishable from those predicted by the ‘isothermal’ type of EoS reported previously.

Keywords

rutileEquation of StateMie–Grüneisen–Debye EoS
Type
Commentary
Information
Mineralogical Magazine , Volume 84 , Issue 2 , April 2020 , pp. 355 - 357
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: Juraj Majzlan

References

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