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Timing of crystallization of the lunar magma ocean constrained by the oldest zircon

Abstract

The Moon is thought to have formed through the consolidation of debris from the collision of a Mars-sized body with the Earth more than 4,500 million years ago. The primitive Moon was covered with a thick layer of melt known as the lunar magma ocean1, the crystallization of which resulted in the Moon’s surface as it is observed today. There is considerable debate, however, over the precise timing and duration of the process of magma ocean crystallization. Here we date a zircon from lunar breccias to an age of 4,417±6 million years. This date provides a precise younger age limit for the solidification of the lunar magma ocean. We propose a model that suggests an exponential rate of lunar crystallization, based on a combination of this oldest known lunar zircon and the age of the Moon-forming giant impact. We conclude that the formation of the Moon’s anorthositic crust followed the solidification of 80–85% of the original melt, within about 100 million years of the collision. The existence of younger zircons2 is indicative of the continued solidification of a small percentage of melt for an extra 200–400 million years.

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Figure 1: Microstructure of the zircon grain from lunar breccia 72215, 195.
Figure 2: U–Pb SHRIMP data for the zircon from the breccia thin section 72215, 195.
Figure 3: LMO crystallization paths based on the available chronological data.

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Acknowledgements

In particular we would like to thank the astronauts of Apollo 17 for collecting the sample. The project was supported by the office of R&D department at Curtin University of Technology. Imaging was supported by the Australian Research Council Discovery Grant DP0664078 to S.R. and N.T.

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Correspondence to A. Nemchin.

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Supplementary Information, Table S1

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Nemchin, A., Timms, N., Pidgeon, R. et al. Timing of crystallization of the lunar magma ocean constrained by the oldest zircon. Nature Geosci 2, 133–136 (2009). https://doi.org/10.1038/ngeo417

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