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DOI	10.1038/s41561-021-00838-6
	Sulfur isotopic signature of Earth established by planetesimal volatile evaporation
	Wang W.; Li C.-H.; Brodholt J.P.; Huang S.; Walter M.J.; Li M.; Wu Z.; Huang F.; Wang S.-J.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:11
英文摘要	How and when Earth’s volatile content was established is controversial with several mechanisms postulated, including planetesimal evaporation, core formation and the late delivery of undifferentiated chondrite-like materials. The isotopes of volatile elements such as sulfur can be fractionated during planetary accretion and differentiation and thus are potential tracers of these processes. Using first-principles calculations, we examine sulfur isotope fractionation during core formation and planetesimal evaporation. We find no measurable sulfur isotope fractionation between silicate and metallic melts at core-forming conditions, indicating that the observed light sulfur isotope composition of the bulk silicate Earth relative to chondrites cannot be explained by metal–silicate fractionation. Our thermodynamic calculations show that sulfur evaporates mostly as H2S during planetesimal evaporation when nebular H2 is present. The observed bulk Earth sulfur isotope signature and abundance can be reproduced by evaporative loss of about 90% sulfur mainly as H2S from molten planetesimals before nebular H2 is dissipated. The heavy sulfur isotope composition of the Moon relative to the Earth is consistent with evaporative sulfur loss under 94–98% saturation condition during the Moon-forming giant impact. In summary, volatile evaporation from molten planetesimals before Earth’s formation probably played a key role in establishing Earth’s volatile element content. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	abundance; accretion; differentiation; evaporation; fractionation; planetesimal; saturation; sulfur isotope; Chondrites
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/250838
作者单位	Laboratory of Seismology and Physics of Earth’s Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Department of Earth Sciences, University College London, London, United Kingdom; Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, United States; International Center for Planetary Science, College of Geosciences, Chengdu University of Technology, Chengdu, China; CAS Key Laboratory of Crust–Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway; Department of Geoscience, University of Nevada, Las Vegas, NV, United States; Department of Physics and Astronomy, University of Nevada, Las Vegas, NV, United States; College of Physics, Jilin Normal University, Siping, China; CAS Center for Excellence in Comparative Planetology, USTC, Hefei, China; National Geophysical Observatory at...
推荐引用方式 GB/T 7714	Wang W.,Li C.-H.,Brodholt J.P.,et al. Sulfur isotopic signature of Earth established by planetesimal volatile evaporation[J],2021,14(11).
APA	Wang W..,Li C.-H..,Brodholt J.P..,Huang S..,Walter M.J..,...&Wang S.-J..(2021).Sulfur isotopic signature of Earth established by planetesimal volatile evaporation.Nature Geoscience,14(11).
MLA	Wang W.,et al."Sulfur isotopic signature of Earth established by planetesimal volatile evaporation".Nature Geoscience 14.11(2021).