DOI: 10.1038/ngeo2574
论文题名: Lunar volatile depletion due to incomplete accretion within an impact-generated disk
作者: Canup R.M. ; Visscher C. ; Salmon J. ; Fegley B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 12 起始页码: 918
结束页码: 921
语种: 英语
Scopus关键词: accretion
; lunar crust
; lunar mantle
; planetary landform
; volatile organic compound
英文摘要: The Moon may have formed from an Earth-orbiting disk of vapour and melt produced by a giant impact. The mantles of the Moon and Earth have similar compositions. However, it is unclear why lunar samples are more depleted in volatile elements than terrestrial mantle rocks, given that an evaporative escape mechanism seems inconsistent with expected disk conditions. Dynamical models suggest that the Moon initially accreted from the outermost disk, but later acquired up to 60% of its mass from melt originating from the inner disk. Here we combine dynamical, thermal and chemical models to show that volatile depletion in the Moon can be explained by preferential accretion of volatile-rich melt in the inner disk to the Earth, rather than to the growing Moon. Melt in the inner disk is initially hot and volatile poor, but volatiles condense as the disk cools. In our simulations, the delivery of inner disk melt to the Moon effectively ceases when gravitational interactions cause the Moon's orbit to expand away from the disk, and this termination of lunar accretion occurs before condensation of potassium and more volatile elements. Thus, the portion of the Moon derived from the inner disk is expected to be volatile depleted. We suggest that this mechanism may explain part or all of the Moon's volatile depletion, depending on the degree of mixing within the lunar interior. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106130
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: Planetary Sciences Dir., Southwest Research Institute, Boulder, CO, United States; Department of Chemistry and Planetary Sciences, Dordt College, Sioux Center, Iowa, United States; Department of Earth and Planetary Sciences, McDonnell Center for Space Sciences, Washington University, St Louis, MO, United States
Recommended Citation:
Canup R.M.,Visscher C.,Salmon J.,et al. Lunar volatile depletion due to incomplete accretion within an impact-generated disk[J]. Nature Geoscience,2015-01-01,8(12)