The role of impact bombardment history in lunar evolution

• Published in: Icarus (New York, N.Y. 1962) Vol. 286; pp. 138 - 152
• Main Authors: Rolf, T., Zhu, M.-H., Wünnemann, K., Werner, S.C.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.04.2017
• Subjects: Impact processes; Internal evolution; Lunar basins; Mantle convection; Moon; Lunar basins; Impact processes; Internal evolution; Moon; Mantle convection
• ISSN: 0019-1035; 1090-2643
• DOI: 10.1016/j.icarus.2016.10.007

•We present 3D evolution models of the Moon coupled to its early bombardment history.•Thermal anomalies induced by impacts on the Moon decay within 100–200 Myrs.•Ejecta deposits modify surface heat flux even on long timescales.•Surface insulation may maintain bombardment-induced anomalies until present.•Impact bombardment may alter lunar contraction history. The lunar surface features diverse impact structures originating from its early bombardment; the largest among them are the lunar basins. Basin-forming impacts delivered large amounts of energy to the target and expelled lots of material that deposited as an insulating blanket in the vicinity of the impact. Here, we investigate how such processes may have altered the lunar evolution. We combine lunar basin chronologies with numerical models of basin formation and 3D thermochemical mantle convection and analyse the role of single generic impacts resulting in basins with varying diameter, formation time, location and ejecta properties. The direct effects of a single impact are enhanced melt generation as well as thermal and heat flux anomalies, but these are limited to ∼ 100 Myr following the impact. We use these insights in multi-impact scenarios more relevant for the Moon, which lead to a widespread ejecta blanket and make impact-induced effects more substantial. Lunar contraction history may be altered by the impact bombardment in favour of an early expansion phase as suggested by recent observations. Moreover, imprints of the early bombardment may be kept in the thermal and compositional state of the Moon’s interior until modern times. These can be as large as those induced by uncertainties in bulk lunar heat content, if surface insulation due to ejecta is efficient. In this case, model-predicted present-day thermal profiles match independent constraints better if the bulk Moon is not significantly enriched in refractory elements compared to Earth.