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| Titel |
Effect of water on metal-silicate partitioning and hydrogen incorporation in
the core of the Earth and Mars |
| VerfasserIn |
Vincent Clesi, Mohamed Ali Bouhifd, Nathalie Bolfan-Casanova, Geeth Manthilake, Denis Andrault, Caroline Raepsaet, Hélène Bureau, Hicham Khodja |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250152059
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| Publikation (Nr.) |
 EGU/EGU2017-16849.pdf |
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| Zusammenfassung |
| The accretion of planets from primordial materials and their subsequent
differentiation to form a core and a mantle are fundamental questions in
terrestrial and solar system. Many of the questions about the processes are
still open and much debated. For example, could the presence of water during
the metallic phase segregation affect the planet-accretion models?
The existing studies on the elemental metal-silicate partitioning under
hydrous conditions are limited to 1 GPa [5,6] well below the likely
conditions prevailing during core formation on Earth and Mars. In the
present study we use multi-anvil technique aver a range of $P$, $T$, $f_{O$_2$}$ and
water content (5 -- 20 GPa, 2000 -- 2500 K, from 1 to 5 log units below the
iron-w\"{u}stite buffer, and for $X_{H2O}$ varying from 500 ppm to 1.5
wt.{\%}).
The present experimental results show that except for Fe, there is no effect
of water on the partitioning of moderately siderophile elements. It allowed
us to build consistent models of planetary accretion from reducing to
oxidized conditions. Furthermore, for the range of water concentrations
studied, there is no evidence of an important hydrogen incorporation into
planetary cores, thus making unlikely for hydrogen to be a major light
element of the core as previsously assumed [7].
[1] Morbidelli \textit{et al}. (2000) \textit{Meteoritics {\&} Planetary Science} \textbf{1320}, 1309-1320. [2] Marty (2012) \textit{EPSL}
\textbf{313-314, }56-66. [3] O'Brien \textit{et al}. (2014) \textit{Icarus} \textbf{239}, 74-84. [4]
Sarafian \textit{et al}. (2014) \textit{Science} \textbf{346}, 623-626. [5] Righter and Drake (1999) \textit{EPSL }\textbf{171},
383-399. [6] Jana and Walker (1999) \textit{GCA} \textbf{63}, 2299-2310. [7] Okuchi, T.
(1997) \textit{Science} \textbf{278}, 1781-1784 |
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