Pb-isotopic evidence for an early, enriched crust on Mars

J.J. Bellucci, A.A. Nemchin, M.J. Whitehouse, M. Humayun, R. Hewins, B. Zanda

Earth and Planetary Science Letters
Volume 410, 15 January 2015, Pages 34–41
available online 2 December 2014

LINK (open access)