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...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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European Association of Geochemistry
2020
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| _version_ | 1826288321058308096 |
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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. |
| first_indexed | 2024-03-07T02:11:56Z |
| format | Journal article |
| id | oxford-uuid:a0f3a124-37ff-43e7-8463-b5a39e3ea92c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:11:56Z |
| publishDate | 2020 |
| publisher | European Association of Geochemistry |
| record_format | dspace |
| 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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