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Articles | Volume 16, issue 4/5
Articles | Volume 16, issue 4/5
https://doi.org/10.5194/se-16-297-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-297-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 4/5
Research article
 | 
14 May 2025
Research article |  | 14 May 2025

On the global geodynamic consequences of different phase boundary morphologies

Gwynfor T. Morgan, J. Huw Davies, Robert Myhill, and James Panton

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Cited articles

Baumgardner, J. R.: A Three-Dimensional Finite Element Model for Mantle Convection, Ph.D. thesis, University of California, Los Angeles, 1983. a, b
Bina, C. R. and Helffrich, G.: Geophysical Constraints on Mantle Composition, in: Treatise on Geochemistry, 2nd edn., vol. 3, 41–65, Elsevier Inc., https://doi.org/10.1016/B978-0-08-095975-7.00202-3, 2013. a
Bina, C. R. and Liu, M.: A note on the sensitivity of mantle convection models to composition-dependent phase relations, Geophys. Res. Lett., 22, 2565–2568, https://doi.org/10.1029/95GL02546, 1995. a
Birch, F.: Elasticity and constitution of the Earth's interior, J. Geophys. Res. (1896–1977), 57, 227–286, https://doi.org/10.1029/JZ057i002p00227, 1952. a
Bunge, H. P., Richards, M. A., and Baumgardner, J. R.: A sensitivity study of three-dimensional spherical mantle convection at 108 Rayleigh number: Effects of depth-dependent viscosity, heating mode, and an endothermic phase change, J. Geophys. Res.-Sol. Ea., 102, 11991–12007, https://doi.org/10.1029/96jb03806, 1997. a, b, c
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Phase transitions can influence mantle convection, inhibiting or promoting vertical flow. We are motivated by two examples: the post-spinel reaction proceeding via akimotoite at cool temperatures and a curving post-garnet boundary. Some have suggested these could change mantle dynamics. We find this is unlikely for both reactions: the first due to the uniqueness of thermodynamic state and the second due to the low magnitude of the boundary’s  slope in pressure–temperature space and density change.
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