Grain boundary diffusion cannot explain the W isotope heterogeneities of the deep mantle

Yihang Peng (), Takashi Yoshino and Jie Deng ()
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Yihang Peng: Princeton University
Takashi Yoshino: Okayama University, Misasa
Jie Deng: Princeton University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract The low 182W/184W and high 3He/4He in some ocean island basalts compared to the bulk mantle values may derive from the Earth’s core through long-term core-mantle interactions. It has been proposed that the grain boundary diffusion of siderophile elements is an efficient mechanism for core-mantle interaction and may effectively modify the W isotopic compositions of the plume-source mantle. In this study, we perform large-scale molecular dynamics simulations driven by machine learning potentials of ab initio quality to investigate the diffusion of W along ferropericlase grain boundaries and in (Mg,Fe)O liquid. Here we show that the diffusion of W is sluggish under core-mantle boundary conditions, and thus is unlikely to have observable impacts on the W isotopic compositions of terrestrial igneous rocks.

Date: 2025
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DOI: 10.1038/s41467-025-57120-1

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