Helium in earth's early core

M. A. Bouhifd, Andrew P. Jephcoat, Veronika S. Heber, Simon P. Kelley

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The observed escape of the primordial helium isotope, 3 He, from the Earth's interior indicates that primordial helium survived the energetic process of planetary accretion and has been trapped within the Earth to the present day. Two distinct reservoirs in the Earth's interior have been invoked to account for variations in the 3 He/ 4 He ratio observed at the surface in ocean basalts: a conventional depleted mantle source and a deep, still enigmatic, source that must have been isolated from processing throughout Earth history. The Earth's iron-based core has not been considered a potential helium source because partitioning of helium into metal liquid has been assumed to be negligible. Here we determine helium partitioning in experiments between molten silicates and iron-rich metal liquids at conditions up to 16 GPa and 3,000 K. Analyses of the samples by ultraviolet laser ablation mass spectrometry yield metal-silicate helium partition coefficients that range between 4.7×10 -3 and 1.7×10 -2 and suggest that significant quantities of helium may reside in the core. Based on estimated concentrations of primordial helium, we conclude that the early core could have incorporated enough helium to supply deep-rooted plumes enriched in 3 He throughout the age of the Earth.

Original languageEnglish
Pages (from-to)982-986
Number of pages5
JournalNature Geoscience
Volume6
Issue number11
DOIs
Publication statusPublished - Nov 2013
Externally publishedYes

Fingerprint

early Earth
helium
metal
partitioning
silicate
helium isotope
iron
liquid
partition coefficient
mantle source
ablation
energetics
plume
mass spectrometry
basalt
laser
accretion
ocean
history

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Bouhifd, M. A., Jephcoat, A. P., Heber, V. S., & Kelley, S. P. (2013). Helium in earth's early core. Nature Geoscience, 6(11), 982-986. https://doi.org/10.1038/ngeo1959

Helium in earth's early core. / Bouhifd, M. A.; Jephcoat, Andrew P.; Heber, Veronika S.; Kelley, Simon P.

In: Nature Geoscience, Vol. 6, No. 11, 11.2013, p. 982-986.

Research output: Contribution to journalArticle

Bouhifd, MA, Jephcoat, AP, Heber, VS & Kelley, SP 2013, 'Helium in earth's early core', Nature Geoscience, vol. 6, no. 11, pp. 982-986. https://doi.org/10.1038/ngeo1959
Bouhifd MA, Jephcoat AP, Heber VS, Kelley SP. Helium in earth's early core. Nature Geoscience. 2013 Nov;6(11):982-986. https://doi.org/10.1038/ngeo1959
Bouhifd, M. A. ; Jephcoat, Andrew P. ; Heber, Veronika S. ; Kelley, Simon P. / Helium in earth's early core. In: Nature Geoscience. 2013 ; Vol. 6, No. 11. pp. 982-986.
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