EGU22-2214
https://doi.org/10.5194/egusphere-egu22-2214
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Large impact cratering during lunar magma ocean solidification

Katarina Miljkovic1, Mark A. Wieczorek2, Matthieu Laneuville3, Alexander Nemchin1, Phil A. Bland1, and Maria T. Zuber4
Katarina Miljkovic et al.
  • 1School of Earth and Planetary Sciences, Curtin University, Western Australia (katarina.miljkovic@curtin.edu.au)
  • 2Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
  • 3Earth-Life Science Institute, Tokyo, Japan
  • 4Massachusetts Institute of Technology, Cambridge, USA

The lunar cratering record is used to constrain the bombardment history of both the Earth and the Moon. However, it is suggested from different perspectives, including impact crater dating, asteroid dynamics, lunar samples, impact basin-forming simulations, and lunar evolution modelling, that the Moon could be missing evidence of its earliest cratering record. Here we report that impact basins formed during the lunar magma ocean solidification should have produced different crater morphologies in comparison to later epochs. A low viscosity layer, mimicking a melt layer, between the crust and mantle could cause the entire impact basin size range to be susceptible to immediate and extreme crustal relaxation forming almost unidentifiable topographic and crustal thickness signatures. Lunar basins formed while the lunar magma ocean was still solidifying may escape detection, which is agreeing with studies that suggest a higher impact flux than previously thought in the earliest epoch of Earth-Moon evolution.

How to cite: Miljkovic, K., Wieczorek, M. A., Laneuville, M., Nemchin, A., Bland, P. A., and Zuber, M. T.: Large impact cratering during lunar magma ocean solidification, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-2214, https://doi.org/10.5194/egusphere-egu22-2214, 2022.

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