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Articles | Volume 14, issue 2
Articles | Volume 14, issue 2
https://doi.org/10.5194/se-14-119-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-14-119-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 14, issue 2
Research article
 | 
07 Feb 2023
Research article |  | 07 Feb 2023

Influence of heterogeneous thermal conductivity on the long-term evolution of the lower-mantle thermochemical structure: implications for primordial reservoirs

Joshua Martin Guerrero, Frédéric Deschamps, Yang Li, Wen-Pin Hsieh, and Paul James Tackley

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Cited articles

Ammann, M. W., Walker, A. M., Stackhouse, S., Wookey, J., Forte, A. M., Brodholt, J. P., and Dobson, D. P.: Variation of thermal conductivity and heat flux at the Earth's core mantle boundary, Earth Planet. Sc. Lett., 390, 175–185, 2014. a
Boehler, R.: High-pressure experiments and the phase diagram of lower mantle and core materials, Rev. Geophys., 38, 221–245, 2000. a
Citron, R. I., Lourenço, D. L., Wilson, A. J., Grima, A. G., Wipperfurth, S. A., Rudolph, M. L., Cottaar, S., and Montési, L. G.: Effects of Heat‐Producing Elements on the Stability of Deep Mantle Thermochemical Piles, Geochem. Geophy. Geosy., 21, e2019GC008895, https://doi.org/10.1029/2019GC008895, 2020. a
Dalton, D. A., Hsieh, W. P., Hohensee, G. T., Cahill, D. G., and Goncharov, A. F.: Effect of mass disorder on the lattice thermal conductivity of MgO periclase under pressure, Scientific Reports, 3, 2400, https://doi.org/10.1038/srep02400, 2013. a, b
Davaille, A. and Romanowicz, B.: Deflating the LLSVPs: bundles of mantle thermochemical plumes rather than thick stagnant “piles”, Tectonics, 39, e2020TC006265, https://doi.org/10.1029/2020TC006265, 2020. a, b, c
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The mantle thermal conductivity's dependencies on temperature, pressure, and composition are often suppressed in numerical models. We examine the effect of these dependencies on the long-term evolution of lower-mantle thermochemical structure. We propose that depth-dependent conductivities derived from mantle minerals, along with moderate temperature and compositional correction, emulate the Earth's mean lowermost-mantle conductivity values and produce a stable two-pile configuration.
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