Some Issues on Core‐Mantle Chemical Interactions: The Role of Core Formation Processes

Karato, Shun‐ichiro

doi:10.1002/9781119526919.ch7

Cited by 2 publications

References 79 publications

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Hydrogen and silicon are the preferred light elements in Earth’s core

Liu,

Jing

2024

Commun Earth Environ

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Hydrogen is an important light element in the Earth’s core for its high cosmochemical abundance and strong affinity to iron under core-formation conditions. Thus, constraining the core composition requires knowledge on the distribution of hydrogen between the liquid outer core and solid inner core. Here we investigate the chemical equilibrium of hydrogen at the inner-core boundary by calculating the chemical potential of hydrogen in solid and liquid iron-hydrogen alloys, respectively, using first-principles molecular dynamic simulations and neural network methods. We find that hydrogen partitions preferentially into the outer core and provides a major contribution to the density jump across the inner-core boundary. Combining geophysical constraints, mineral physics data, and chemical equilibrium, we evaluated light element abundances in the outer and inner cores simultaneously. Our results suggest hydrogen and silicon are the preferred light elements in the core, implying a relatively reduced environment during the Earth’s accretion and core-formation processes.

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Hydrogen and silicon are the preferred light elements in Earth’s core

Liu,

Jing

2024

Commun Earth Environ

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Earth’s core composition constrained by H partitioning at the inner core boundary

Jing,

Liu

2024

Preprint

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Recent studies suggest that H is an important light element in the Earth’s core for its high cosmochemical abundance and strong affinity to Fe under core-formation conditions. Thus, constraining the light element contents in the core requires knowledge on the distribution of H between the liquid outer core and solid inner core. Here we investigate the chemical equilibrium of H at the inner-core boundary (ICB) by calculating the chemical potential of H in solid and liquid Fe-H alloys, respectively, using first-principles molecular dynamic simulations in conjunction with the particle insertion and neural network methods. We find that H partitions preferentially into the outer core and provides a major contribution to the density jump across the ICB boundary. Combining geophysical constraints, mineral physics data, and chemical equilibrium at the ICB, we evaluated light element abundances in the outer and inner cores simultaneously. Our results suggest H and Si are the preferred light elements in the core, implying a relatively reduced environment during the Earth’s accretion and core-formation processes.

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Some Issues on Core‐Mantle Chemical Interactions: The Role of Core Formation Processes

Cited by 2 publications

References 79 publications

Hydrogen and silicon are the preferred light elements in Earth’s core

Hydrogen and silicon are the preferred light elements in Earth’s core

Earth’s core composition constrained by H partitioning at the inner core boundary

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