An asteroidal origin for water in the Moon

作者：Barnes Jessica J; Kring David A; Tartese Romain; Franchi Ian A; Anand Mahesh; Russell Sara S

来源：Nature Communications, 2016, 7(1): 11684.

DOI：10.1038/ncomms11684

The Apollo-derived tenet of an anhydrous Moon has been contested following measurement of water in several lunar samples that require water to be present in the lunar interior. However, significant uncertainties exist regarding the flux, sources and timing of water delivery to the Moon. Here we address those fundamental issues by constraining the mass of water accreted to the Moon and modelling the relative proportions of asteroidal and cometary sources for water that are consistent with measured isotopic compositions of lunar samples. We determine that a combination of carbonaceous chondrite-type materials were responsible for the majority of water (and nitrogen) delivered to the Earth-Moon system. Crucially, we conclude that comets containing water enriched in deuterium contributed significantly <20% of the water in the Moon. Therefore, our work places important constraints on the types of objects impacting the Moon similar to 4.5-4.3 billion years ago and on the origin of water in the inner Solar System.

• 出版日期2016-5