Potential of Earth's core as a reservoir for noble gases: case for helium and neon

This study investigates metal–silicate partitioning of neon (DNe) under the likely conditions of early Earth’s core formation: up to 16 GPa, ∼ 3000 K and an oxygen fugacity near IW-2 (2 log units below the Iron-Wüstite buffer). We find that the DNe coefficients range between 10−2 and 10−1. These par...

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主要な著者: Bouhifd, MA, Jephcoat, AP, Porcelli, D, Kelley, SP, Marty, B
フォーマット: Journal article
言語:English
出版事項: European Association of Geochemistry 2020
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author Bouhifd, MA
Jephcoat, AP
Porcelli, D
Kelley, SP
Marty, B
author_facet Bouhifd, MA
Jephcoat, AP
Porcelli, D
Kelley, SP
Marty, B
author_sort Bouhifd, MA
collection OXFORD
description This study investigates metal–silicate partitioning of neon (DNe) under the likely conditions of early Earth’s core formation: up to 16 GPa, ∼ 3000 K and an oxygen fugacity near IW-2 (2 log units below the Iron-Wüstite buffer). We find that the DNe coefficients range between 10−2 and 10−1. These partition coefficients are only one of the controlling factors of noble gas distributions within the early Earth: because, even if DHe and DNe are low (∼10−4), there may have been sufficient noble gases present in the mantle to supply a significant quantity of He and Ne to the core. Assuming gas-melt equilibrium of the molten proto-Earth with a nebular gas composition and concomitant metal-silicate differentiation, the core would have inherited and maintained throughout Earth’s history high 3He/4He ratios and low 3He/22Ne ratios (<0.6), making the core a potential source of primordial light noble gases in mantle plumes.
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spelling oxford-uuid:a0f3a124-37ff-43e7-8463-b5a39e3ea92c2022-03-27T02:09:25ZPotential of Earth's core as a reservoir for noble gases: case for helium and neonJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a0f3a124-37ff-43e7-8463-b5a39e3ea92cEnglishSymplectic ElementsEuropean Association of Geochemistry2020Bouhifd, MAJephcoat, APPorcelli, DKelley, SPMarty, BThis study investigates metal–silicate partitioning of neon (DNe) under the likely conditions of early Earth’s core formation: up to 16 GPa, ∼ 3000 K and an oxygen fugacity near IW-2 (2 log units below the Iron-Wüstite buffer). We find that the DNe coefficients range between 10−2 and 10−1. These partition coefficients are only one of the controlling factors of noble gas distributions within the early Earth: because, even if DHe and DNe are low (∼10−4), there may have been sufficient noble gases present in the mantle to supply a significant quantity of He and Ne to the core. Assuming gas-melt equilibrium of the molten proto-Earth with a nebular gas composition and concomitant metal-silicate differentiation, the core would have inherited and maintained throughout Earth’s history high 3He/4He ratios and low 3He/22Ne ratios (<0.6), making the core a potential source of primordial light noble gases in mantle plumes.
spellingShingle Bouhifd, MA
Jephcoat, AP
Porcelli, D
Kelley, SP
Marty, B
Potential of Earth's core as a reservoir for noble gases: case for helium and neon
title Potential of Earth's core as a reservoir for noble gases: case for helium and neon
title_full Potential of Earth's core as a reservoir for noble gases: case for helium and neon
title_fullStr Potential of Earth's core as a reservoir for noble gases: case for helium and neon
title_full_unstemmed Potential of Earth's core as a reservoir for noble gases: case for helium and neon
title_short Potential of Earth's core as a reservoir for noble gases: case for helium and neon
title_sort potential of earth s core as a reservoir for noble gases case for helium and neon
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AT kelleysp potentialofearthscoreasareservoirfornoblegasescaseforheliumandneon
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