globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2231
论文题名:
Record of the ancient martian hydrosphere and atmosphere preserved in zircon from a martian meteorite
作者: Nemchin A.A.; Humayun M.; Whitehouse M.J.; Hewins R.H.; Lorand J.-P.; Kennedy A.; Grange M.; Zanda B.; Fieni C.; Deldicque D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:9
起始页码: 638
结束页码: 642
语种: 英语
英文摘要: Mars exhibits ample evidence for an ancient surface hydrosphere. The oxygen isotope compositions of carbonate minerals and alteration products in martian meteorites suggest that this ancient hydrosphere was not in isotopic equilibrium with the martian lithosphere. Martian meteorite NWA 7533 is composed of regolith breccia from the heavily cratered terrains of ancient Mars and contains zircon grains for which U-Pb ages have been reported. Here we report variations between the oxygen isotopic compositions of four zircon grains from NWA 7533. We propose that these variations can be explained if the mantle melts from which the zircon crystallized approximately 4.43 Gyr ago had assimiliated 17 O-enriched regolith materials, and that some of the zircon grains, while in a metamict state, were later altered by low-temperature fluids near the surface less than 1.7 Gyr ago. Enrichment of the martian regolith in 17 O before the zircon crystallized, presumably through exchange with the 17 O-enriched atmosphere or hydrosphere during surface alteration, suggests that the thick primary atmosphere of Mars was lost within the first 120 Myr after accretion. We conclude that the observed variation of 17 O anomalies in zircon from NWA 7533 points to prolonged interaction between the martian regolith, atmosphere and hydrosphere. © 2014 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106585
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Geosciences, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden; Department of Applied Geology, Curtin University, Perth, WA 6845, Australia; Department of Earth, Ocean AndAtmospheric Science and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, United States; Institut de Minéralogie de Physique des Matériaux et Cosmochimie (IMPMC), Sorbonne Université, Muséum National d'Histoire Naturelle, UPMC Université Paris 06, 61 rue Buon, F-75005 Paris, France; Department of Earth and Planetary Sciences, Rutgers University, Piscataway NJ 08854, United States; Laboratoire de Planétologie et Géodynamique de Nantes, CNRS UMR 6112, Université de Nantes, 2 Rue de la Houssinière, BP 92208 44322 Nantes Cédex 3, France; Department of Applied Physics, Curtin University, Perth WA 6845, Australia; Ecole Normale Supérieure, UMR 8538, 75231 Paris CEDEX 5, France

Recommended Citation:
Nemchin A.A.,Humayun M.,Whitehouse M.J.,et al. Record of the ancient martian hydrosphere and atmosphere preserved in zircon from a martian meteorite[J]. Nature Geoscience,2014-01-01,7(9)
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