Partitioning of silicon and sulfur between solid and liquid iron under core pressures: Constraints on Earth's core composition

Sakai, Fumiya; Hirose, Kei; Morard, Guillaume

doi:10.1016/j.epsl.2023.118449

Cited by 4 publications

(3 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Seismic velocities of the inner core could provide additional constraints to our composition model, but awaiting future studies on the velocity of Fe-S-Si-H alloys under inner core conditions. It should be noted that our composition model assumes that the partition coefficients of various light elements are independent from each other for the composition range relevant to the core, however, pair interactions between light elements in Fe-alloys have been observed for S-Si 53,54 , S-C 55 , C-H 56 , etc. Specifically, recent solid/ liquid partition experiments 54 on the Fe-Si-S system up to 189 GPa have demonstrated that D S decreases considerably with increasing Si content, whereas D Si increases with increasing S content.…”

Section: The Composition Of the Earth's Corementioning

confidence: 99%

“…It should be noted that our composition model assumes that the partition coefficients of various light elements are independent from each other for the composition range relevant to the core, however, pair interactions between light elements in Fe-alloys have been observed for S-Si 53,54 , S-C 55 , C-H 56 , etc. Specifically, recent solid/ liquid partition experiments 54 on the Fe-Si-S system up to 189 GPa have demonstrated that D S decreases considerably with increasing Si content, whereas D Si increases with increasing S content. We conducted an additional global search of core compositions by using D Si = 1.1 and Ds = 0.2 extrapolated from ref.…”

Section: The Composition Of the Earth's Corementioning

confidence: 99%

“…We conducted an additional global search of core compositions by using D Si = 1.1 and Ds = 0.2 extrapolated from ref. 54. to explore the effect of Si-S interactions on the optimal compositions.…”

Section: The Composition Of the Earth's Corementioning

confidence: 99%

See 2 more Smart Citations

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

Liu,

Jing

2024

Commun Earth Environ

View full text Add to dashboard Cite

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.

show abstract

Section: The Composition Of the Earth's Corementioning

confidence: 99%