Siderophile and chalcophile element abundances in shergottites: Implications for Martian core formation

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Shuying Yang, Munir Humayun, Kevin Righter, Gwendolyn Jefferson, Dana Fields and Anthony J. Irving

Meteoritics & Planetary Science. doi: 10.1111/maps.12384

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An unexpected benefit has been the determination of the abundances of Ir and Os with a precision and accuracy comparable to the isotope dilution technique. Overall, the speed and small sample consumption afforded by this technique makes it an important tool widely applicable to small or rare meteorites for which a polished sample was prepared. The new volatile siderophile and chalcophile element abundances have been employed to determine Ge and Sb abundances, and revise Zn, As, and Bi abundances for the Martian mantle. The new estimates of Martian mantle composition support core formation at intermediate pressures (14 ± 3 GPa) in a magma ocean on Mars.

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