Articles | Volume 14, issue 2
https://doi.org/10.5194/se-14-119-2023
https://doi.org/10.5194/se-14-119-2023
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
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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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Short summary
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.