期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 473, 期 -, 页码 94-103出版社
ELSEVIER
DOI: 10.1016/j.epsl.2017.05.024
关键词
Earth's core; light elements; Melting curves
资金
- Planetlab program of the French National Research Agency (ANR) [ANR-12-BS04-001504]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [637748]
- UK Natural Environment Research Council [NE/J018945/1]
- Region Ile de France grant SESAME [I-07-593/R]
- INSU-CNRS
- INP-CNRS
- University Pierre et Marie Curie-Paris 6
- French National Research Agency (ANR) [ANR-07-BLAN-0124-01]
- Natural Environment Research Council [NE/J018945/1] Funding Source: researchfish
- European Research Council (ERC) [637748] Funding Source: European Research Council (ERC)
- NERC [NE/J018945/1] Funding Source: UKRI
Eutectic melting temperatures in the Fe-FeO and Fe-Fe3C systems have been determined up to 150 GPa. Melting criteria include observation of a diffuse scattering signal by in situ X-Ray diffraction, and textural characterisation of recovered samples. In addition, compositions of eutectic liquids have been established by combining in situ Rietveld analyses with ex situ chemical analyses. Gathering these new results together with previous reports on Fe-S and Fe-Si systems allow us to discuss the specific effect of each light element (Si, S, O, C) on the melting properties of the outer core. Crystallization temperatures of Si-rich core compositional models are too high to be compatible with the absence of extensive mantle melting at the core-mantle boundary (CMB) and significant amounts of volatile elements such as S and/or C (>5 at%, corresponding to >2 wt%), or a large amount of O(>15 at% corresponding to similar to 5 wt%) are required to reduce the crystallisation temperature of the core material below that of a peridotitic lower mantle. (C) 2017 Elsevier B.V. All rights reserved.
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