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Dr. Borg has recently conducted high precision SmNd isotopic analyses of a suite of 11 Martian basaltic meteorites in order to better constrain the age of planetary core formation on Mars. Dr. Borg will show how these data can be used to evaluate the merits and disadvantages of various mathematical approaches that have been employed in previous isotopic work on Martian core formation. Dr. Borg will explain how Late accretional heating of Mars could either be associated with protracted accretion occurring at a quasi-steady state or alternatively be associated with a late giant impact. If this scenario is correct, then accretion of Mars-sized bodies takes up to 60 Ma and is likely to be contemporaneous with planetary core formation. Dr. Borg will explain how this further challenges the concept that isotopic equilibrium is attained during primordial evolution of planets, and may help to account for geochemical evidence implying addition of material into planetary interiors after core formation was completed.
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