globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0552-y
论文题名:
Multiple early-formed water reservoirs in the interior of Mars
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:4
起始页码: 260
结束页码: 264
语种: 英语
英文关键词: detection method ; Holocene ; isotopic composition ; mantle source ; Mars ; Martian atmosphere ; meteorite ; reservoir
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169551
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Barnes J.J.,McCubbin F.M.,Santos A.R.,et al. Multiple early-formed water reservoirs in the interior of Mars[J]. Nature Geoscience,2020-01-01,13(4)
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