DOI: 10.1038/ngeo2801
论文题名: Carbon and sulfur budget of the silicate Earth explained by accretion of differentiated planetary embryos
作者: Li Y. ; Dasgupta R. ; Tsuno K. ; Monteleone B. ; Shimizu N.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 10 起始页码: 781
结束页码: 785
语种: 英语
Scopus关键词: accretion
; carbon
; fugacity
; hydrogen
; laboratory method
; mantle
; nitrogen
; oxygen
; planetary atmosphere
; siderophile element
; silicate
; sulfur
英文摘要: The abundances of volatile elements in the Earth's mantle have been attributed to the delivery of volatile-rich material after the main phase of accretion. However, no known meteorites could deliver the volatile elements, such as carbon, nitrogen, hydrogen and sulfur, at the relative abundances observed for the silicate Earth. Alternatively, Earth could have acquired its volatile inventory during accretion and differentiation, but the fate of volatile elements during core formation is known only for a limited set of conditions. Here we present constraints from laboratory experiments on the partitioning of carbon and sulfur between metallic cores and silicate mantles under conditions relevant for rocky planetary bodies. We find that carbon remains more siderophile than sulfur over a range of oxygen fugacities; however, our experiments suggest that in reduced or sulfur-rich bodies, carbon is expelled from the segregating core. Combined with previous constraints, we propose that the ratio of carbon to sulfur in the silicate Earth could have been established by differentiation of a planetary embryo that was then accreted to the proto-Earth. We suggest that the accretion of a Mercury-like (reduced) or a sulfur-rich (oxidized) differentiated body - in which carbon has been preferentially partitioned into the mantle - may explain the Earth's carbon and sulfur budgets. © 2016 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105916
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 Earth Science, Rice University, 6100 Main Street, Houston, TX, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Recommended Citation:
Li Y.,Dasgupta R.,Tsuno K.,et al. Carbon and sulfur budget of the silicate Earth explained by accretion of differentiated planetary embryos[J]. Nature Geoscience,2016-01-01,9(10)