Physical Properties and Composition of Cores of Terrestrial Planets

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  • TERASAKI Hidenori
    Department of Earth and Planetary Science, Faculty of Science, Osaka University Department of Earth Sciences, Graduate School of Natural Science and Technology, Okayama University

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  • 地球型惑星核の物性と組成
  • チキュウガタ ワクセイカク ノ ブッセイ ト ソセイ

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Abstract

<p>To constrain the core compositions of terrestrial planets, sound velocity and density of liquid Fe-Ni-S and Fe-Ni-Si alloys were measured up to 14 GPa. Addition of S reduces the P-wave velocity and bulk modulus of liquid Fe-Ni while addition of Si rises the P-wave velocity and does not affect on the bulk modulus in the present pressure range. Based on the obtained elastic properties of liquid Fe-Ni-S and Fe-Ni-Si, the compositions of planetary cores are estimated by matching the planetary geodesy data to 3-7 wt%S or 7-14 wt%Si for Mercury and 30-34 wt%S or 28-33 wt%Si for Mars.</p>

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