气候变化领域集成服务门户(CCPortal): Multiple early-formed water reservoirs in the interior of Mars

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DOI	10.1038/s41561-020-0552-y
	Multiple early-formed water reservoirs in the interior of Mars
	Barnes J.J.; McCubbin F.M.; Santos A.R.; Day J.M.D.; Boyce J.W.; Schwenzer S.P.; Ott U.; Franchi I.A.; Messenger S.; Anand M.; Agee C.B.
发表日期	2020
ISSN	17520894
起始页码	260
结束页码	264
卷号	13 期号:4
英文摘要	The abundance and distribution of water within Mars through time plays a fundamental role in constraining its geological evolution and habitability. The isotopic composition of Martian hydrogen provides insights into the interplay between different water reservoirs on Mars. However, D/H (deuterium/hydrogen) ratios of Martian rocks and of the Martian atmosphere span a wide range of values. This has complicated identification of distinct water reservoirs in and on Mars within the confines of existing models that assume an isotopically homogenous mantle. Here we present D/H data collected by secondary ion mass spectrometry for two Martian meteorites. These data indicate that the Martian crust has been characterized by a constant D/H ratio over the last 3.9 billion years. The crust represents a reservoir with a D/H ratio that is intermediate between at least two isotopically distinct primordial water reservoirs within the Martian mantle, sampled by partial melts from geochemically depleted and enriched mantle sources. From mixing calculations, we find that a subset of depleted Martian basalts are consistent with isotopically light hydrogen (low D/H) in their mantle source, whereas enriched shergottites sampled a mantle source containing heavy hydrogen (high D/H). We propose that the Martian mantle is chemically heterogeneous with multiple water reservoirs, indicating poor mixing within the mantle after accretion, differentiation, and its subsequent thermochemical evolution. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	detection method; Holocene; isotopic composition; mantle source; Mars; Martian atmosphere; meteorite; reservoir
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206743
作者单位	NASA Johnson Space Center, Houston, TX, United States; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; NASA Glenn Research Center, Cleveland, OH, United States; Scripps Institution of Oceanography, La Jolla, CA, United States; The Open University, Milton Keynes, United Kingdom; Max-Planck-Institut für Chemie, Mainz, Germany; MTA Atomki, Debrecen, Hungary; The Natural History Museum, London, United Kingdom; Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States
推荐引用方式 GB/T 7714	Barnes J.J.,McCubbin F.M.,Santos A.R.,et al. Multiple early-formed water reservoirs in the interior of Mars[J],2020,13(4).
APA	Barnes J.J..,McCubbin F.M..,Santos A.R..,Day J.M.D..,Boyce J.W..,...&Agee C.B..(2020).Multiple early-formed water reservoirs in the interior of Mars.Nature Geoscience,13(4).
MLA	Barnes J.J.,et al."Multiple early-formed water reservoirs in the interior of Mars".Nature Geoscience 13.4(2020).