Journal Article

PUBDB-2025-05569

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Depth-dependent anisotropy in the Earth’s inner core linked to chemical stratification

Kolesnikov, E. (Corresponding author)Extern* ; Li, X.Extern* ; Mueller, S.Extern* ; Rohrbach, A.Extern* ; Klemme, S.Extern* ; Berndt-Gerdes, J.Extern* ; Liermann, H.-P.XFEL.EU*DESY* ; Sanchez-Valle, C.Extern* ; Kupenko, I.Extern*

2025
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-025-67067-y  doi:10.3204/PUBDB-2025-05569

Abstract: Seismic anisotropy in the Earth’s inner core (IC), including the heterogeneous, depth-dependent anisotropy structure, is a well-documented yet poorly understood feature plausibly related to the alignment of iron alloy crystals. Here, we report the effect of silicon and carbon on the plastic deformation of hexagonal close-packed (hcp) iron using radial X-ray diffraction at pressures up to 128 GPa and temperatures up to 1100 K. Our results reveal a low compressional wave anisotropy (~2 %) in the Fe-Si-C alloy, consistent with the seismic anisotropy observed in the outer regions of the IC. These findings, together with the higher anisotropy exhibited by pure hcp-Fe, suggest that the depth-dependent elastic anisotropy of the IC may originate from chemical stratification, i.e., radial gradients in silicon and carbon concentrations, during crystallization.

Note: The grant from German ResearchFoundation (DFG) through the DFG Project AOBJ: 662965 GZ.:KU 3832/2–1 was not found in the system. Please add this one also to the financial sources

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PET-D)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20211268 (I-20211268) (I-20211268)
4. LECOR - Light elements in the core (101042572) (101042572)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2025

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