| Title: |
Lunar mantle differentiation and Earth–Moon similarity constrained by Ni stable isotopes |
| Authors: |
Zhu, Ke; Ni, Peng; Chen, Qi; Anand, Mahesh; Zhu, Meng-Hua; Elliott, Tim |
| Source: |
Zhu, K, Ni, P, Chen, Q, Anand, M, Zhu, M-H & Elliott, T 2026, 'Lunar mantle differentiation and Earth–Moon similarity constrained by Ni stable isotopes', Earth and Planetary Science Letters, vol. 683, 119974. https://doi.org/10.1016/j.epsl.2026.119974 |
| Publication Year: |
2026 |
| Collection: |
University of Bristol: Bristol Reserach |
| Description: |
Although the Moon is thought to have formed through a giant impact between proto-Earth and a Mars-sized body, the processes responsible for the chemical and mass-dependent isotopic differences between Earth and Moon remain debated. We report high-precision mass-dependent Ni isotope data for 19 Apollo samples, including one dunite (72415), fifteen low-Ti basalts, and three high-Ti basalts, analyzed by double-spike technique using a multi-collector plasma-sourced mass spectrometer. The dunite 72415 shows an extremely high δ 60/58 Ni value of +1.80 ± 0.01‰, which we attribute to kinetic isotope fractionation from Ni diffusion during re-equilibration between olivine and a later melt. Diffusion modeling of Ni–Fe–Mg systematics reproduces the observed heavy Ni enrichment. In contrast, low-Ti basalts display a mean δ60/58Ni of 0.23 ± 0.20‰ (2SD), unaffected by cosmic-ray exposure, while high-Ti basalts are slightly isotopically lighter (0.06 ± 0.22‰, 2SD). Petrological modeling using pMELTS with recently constrained silicate mineral-melt fractionation factors suggests limited Ni isotope fractionation ( |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/hdl/https://hdl.handle.net/1983/bf220117-66cb-4e39-919b-869dc6334d7d |
| DOI: |
10.1016/j.epsl.2026.119974 |
| Availability: |
https://hdl.handle.net/1983/bf220117-66cb-4e39-919b-869dc6334d7d; https://research-information.bris.ac.uk/en/publications/bf220117-66cb-4e39-919b-869dc6334d7d; https://doi.org/10.1016/j.epsl.2026.119974 |
| Rights: |
info:eu-repo/semantics/openAccess ; http://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.77ED9683 |
| Database: |
BASE |