DOI: 10.1038/ngeo2939
论文题名: Rise of Earth's atmospheric oxygen controlled by efficient subduction of organic carbon
作者: Duncan M.S. ; Dasgupta R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 5 起始页码: 387
结束页码: 392
语种: 英语
Scopus关键词: Archean
; carbon flux
; carbon sequestration
; diamond
; diamond anvil cell
; graphite
; mobility
; numerical model
; organic carbon
; oxygen
; Proterozoic
; rhyolite
; slab
; subduction
; subduction zone
英文摘要: The net flux of carbon between the Earth's interior and exterior, which is critical for redox evolution and planetary habitability, relies heavily on the extent of carbon subduction. While the fate of carbonates during subduction has been studied, little is known about how organic carbon is transferred from the Earth's surface to the interior, although organic carbon sequestration is related to sources of oxygen in the surface environment. Here we use high pressureerature experiments to determine the capacity of rhyolitic melts to carry carbon under graphite-saturated conditions in a subducting slab, and thus to constrain the subduction efficiency of organic carbon, the remnants of life, through time. We use our experimental data and a thermodynamic model of CO 2 dissolution in slab melts to quantify organic carbon mobility as a function of slab parameters. We show that the subduction of graphitized organic carbon, and the graphite and diamond formed by reduction of carbonates with depth, remained efficient even in ancient, hotter subduction zones where oxidized carbon subduction probably remained limited. We suggest that immobilization of organic carbon in subduction zones and deep sequestration in the mantle facilitated the rise (-1/410 3-5 fold) and maintenance of atmospheric oxygen since the Palaeoproterozoic and is causally linked to the Great Oxidation Event. Our modelling shows that episodic recycling of organic carbon before the Great Oxidation Event may also explain occasional whiffs of atmospheric oxygen observed in the Archaean. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105787
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 MS 126, 6100 Main Street, Houston, TX, United States; Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch Rd. NW, Washington, DC, United States
Recommended Citation:
Duncan M.S.,Dasgupta R.. Rise of Earth's atmospheric oxygen controlled by efficient subduction of organic carbon[J]. Nature Geoscience,2017-01-01,10(5)