Siderophile elements in Martian meteorites and implications for core formation in Mars

P. Kong*, M. Ebihara, H. Palme

*この研究の対応する著者

研究成果: Article査読

46 被引用数 (Scopus)

抄録

Noble metals, Mo, W, and 24 other elements were determined in six SNC meteorites of presumably Martian origin. Based on element correlations, representative siderophile element concentrations for the silicate mantle of Mars were inferred. From a comparison with experimentally determined metal/silicate partition coefficients of the moderately siderophile elements: Fe, Ni, Co, W, Mo, and Ga, it is concluded that equilibrium between core forming metal and silicates in Mars has occurred at high temperatures (around 2200°C) and low pressures (<1 GPa). This suggests that metal segregation occurred concurrently with rapid accretion of Mars, which is consistent with the inference from excess 182W in Martian meteorites (Lee and Halliday, 1997). Concentrations of Ir, Os, Ru, Pt, and Au in the analyzed Martian meteorites, except ALH84001, are at a level of approximately 10-2-10-3 X CI. The comparatively high abundances of noble metals in Martian meteorites require the addition of chondritic material after core formation. The similarity in Au/La and Pt/Ca ratios between ALH84001 and the other Martian meteorites suggests crystallization of ALH84001 after complete accretion of Mars.

本文言語English
ページ(範囲)1865-1875
ページ数11
ジャーナルGeochimica et Cosmochimica Acta
63
11-12
DOI
出版ステータスPublished - 1999 6月 1
外部発表はい

ASJC Scopus subject areas

  • 地球化学および岩石学

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