GSTDTAP  > 地球科学
DOI10.1038/NGEO2939
Rise of Earth's atmospheric oxygen controlled by efficient subduction of organic carbon
Duncan, Megan S.1,2; Dasgupta, Rajdeep1
2017-05-01
发表期刊NATURE GEOSCIENCE
ISSN1752-0894
EISSN1752-0908
出版年2017
卷号10期号:5
文章类型Article
语种英语
国家USA
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 pressure-temperature 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 CO2 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 (similar to 10(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.


领域地球科学 ; 气候变化
收录类别SCI-E
WOS记录号WOS:000400407000018
WOS关键词HIGH-PRESSURE ; MELTING EXPERIMENTS ; OXIDATION-STATE ; RHYOLITIC MELT ; CO2 SOLUBILITY ; MANTLE ; GRAPHITE ; CRUST ; CONSTRAINTS ; SPECIATION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/34952
专题地球科学
气候变化
作者单位1.Rice Univ, Dept Earth Sci, MS 126, 6100 Main St, Houston, TX 77005 USA;
2.Carnegie Inst Sci, Geophys Lab, 5251 Broad Branch Rd NW, Washington, DC 20015 USA
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Duncan, Megan S.,Dasgupta, Rajdeep. Rise of Earth's atmospheric oxygen controlled by efficient subduction of organic carbon[J]. NATURE GEOSCIENCE,2017,10(5).
APA Duncan, Megan S.,&Dasgupta, Rajdeep.(2017).Rise of Earth's atmospheric oxygen controlled by efficient subduction of organic carbon.NATURE GEOSCIENCE,10(5).
MLA Duncan, Megan S.,et al."Rise of Earth's atmospheric oxygen controlled by efficient subduction of organic carbon".NATURE GEOSCIENCE 10.5(2017).
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