Constraining on the evolution timescale and internal structure of Mars from Martian magma ocean crystallization model

Abstract

We developed a Martian magma ocean (MMO) crystallization model to simultaneously constrain the evolutionary timescale and internal structure of Mars, using Nd isotopic compositions recorded in Martian meteorites. By incorporating multi-stage crystallization and the accumulation of Ca-perovskite, the model successfully reproduces the anomalous Nd isotopic signatures observed in nakhlites and chassignites. The best-fit model suggests that core formation occurred ~1 Myr after CAI formation and that the MMO solidified over ~70 Myrs. This model can also be applied to other differentiated planetary bodies.