Hf–W–Th evidence for rapid growth of Mars and its status as a planetary embryo

N. Dauphas () and A. Pourmand
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N. Dauphas: Origins Laboratory, The University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637, USA
A. Pourmand: Origins Laboratory, The University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637, USA

Nature, 2011, vol. 473, issue 7348, 489-492

Abstract: The making of Mars Nicolas Dauphas and Ali Pourmand use precise hafnium–tungsten–thorium isotopic data to show that Mars accreted very rapidly and reached about half of its present size in two million years or less. This is consistent with it being a stranded planetary embryo that has not subsequently collided and merged with others, and may explain why the mass of Mars is much smaller than that of Venus and Earth. The results also show that Mars grew before dissipation of the nebular gas, when ∼100-km planetesimals, such as the parent bodies of chondrites, were still being formed.

Date: 2011
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DOI: 10.1038/nature10077

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