Isotopic evidence for volatile replenishment of the Moon during the Late Accretion

• 来源期刊: 国家科学评论（英文版）
• 关键词: hydrogen and chlorine isotopes lunar apatite volatile replenishment Late Accretion
• 年，卷（期）: 2019,（6）
• 页码范围: 1247-1254
• 页数: 8页
• 语种: 英文
• DOI: 10.1093/nsr/nwz033

摘要

The traditional view of a dry,volatile-poor Moon has been challenged by the identification of water and other volatiles in lunar samples,but the volatile budget delivery time(s),source(s) and temporal evolution remain poorly constrained.Here we show that hydrogen and chlorine isotopic ratios in lunar apatite changed significantly during the Late Accretion (LA,4.1-3.8 billion years ago).During this period,deuterium/hydrogen ratios in the Moon changed from initial carbonaceous-chondrite-like values to values consistent with an influx of ordinary-chondrite-like material and pre-LA devated δ37C1 values drop towards lower chondrite-like values.Inferred pre-LA lunar interior water contents are significantly lower than pristine values suggesting degassing,followed by an increase during the LA.These trends are consistent with dynamic models of solar-system evolution,suggesting that the Moon's (and Earth's) initial volatiles were replenished ～0.5 Ga after their formation,with their final budgets reflecting a mixture of sources and delivery times.