Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2022

Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body

, (1, 2) , , (3) , (3) , , (4)
1
2
3
4

Abstract

We report the first Ni and Cr stable isotope data for ureilite meteorites that are the mantle residue of a carbon-rich differentiated planet. Ureilites have similar Ni stable isotope compositions as chondrites, suggesting that the core-mantle differentiation of ureilite parent body (UPB) did not fractionate Ni isotopes. Since the size of Earth is potentially larger than that of UPB; with diameter >690 km), resulting in higher temperatures at the core-mantle boundary of Earth, it can be predicted that the terrestrial core formation may not directly cause Ni stable isotope fractionation. On the other hand, we also report high-precision Cr stable isotope composition of ureilites, including one ureilitic trachyandesite (ALM-A) that is enriched in lighter Cr stable isotopes relative to the main-group ureilites, which suggests that the partial melting occurred on UPB. The globally heavy Cr in the UPB compared to chondrites can be caused by sulfur-rich core formation processes.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2022 - Zhu - Nickel and Chromium Stable Isotopic Composition of Ureilites Implications for.pdf (787.25 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03685884 , version 1 (02-06-2022)

Licence

Attribution - NoDerivatives - CC BY 4.0

Identifiers

Cite

Ke Zhu, Jean-Alix Barrat, Akira Yamaguchi, Olivier Rouxel, Yoan Germain, et al.. Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body. Geophysical Research Letters, 2022, 49, ⟨10.1029/2021GL095557⟩. ⟨insu-03685884⟩
15 View
15 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More