globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1903
论文题名:
Carbon storage at defect sites in mantle mineral analogues
作者: Wu J.; Buseck P.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:10
起始页码: 875
结束页码: 878
语种: 英语
Scopus关键词: carbon dioxide ; carbon sequestration ; carbonate ; dissolved matter ; electrical conductivity ; experimental study ; graphite ; mantle chemistry ; methane ; oxidation ; perovskite ; volcanic eruption
英文摘要: A significant fraction of Earth's carbon resides in the mantle, but the mode of carbon storage presents a long-standing problem. The mantle contains fluids rich in carbon dioxide and methane, carbonate-bearing melts, carbonate minerals, graphite, diamond and carbides, as well as dissolved carbon atoms in metals. However, it is uncertain whether these can sufficiently account for the total amount of carbon thought to be stored in the mantle and the volume of carbon degassed from the mantle at volcanoes. Moreover, such carbon hosts should significantly affect the physical and chemical behaviour of the mantle, including its melting temperature, electrical conductivity and oxidation state. Here we use in situ transmission electron microscopy to measure the storage of carbon within common mantle mineral analogues - nickel-doped lanthanum chromate perovskite and titanium dioxide - in laboratory experiments at high pressure and temperature. We detect elevated carbon concentrations at defect sites in the nanocrystals, maintained at high pressures within annealed carbon nanocages. Specifically, our experiments show that small stacking faults within the mantle analogue materials are effective carbon sinks at mantle conditions, potentially providing an efficient mechanism for carbon storage in the mantle. Furthermore, this carbon can be readily released under lower pressure conditions, and may therefore help to explain carbon release in volcanic eruptions. © 2013 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106684
Appears in Collections:气候减缓与适应
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作者单位: School of Earth and Space Exploration, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AR 85287, United States

Recommended Citation:
Wu J.,Buseck P.R.. Carbon storage at defect sites in mantle mineral analogues[J]. Nature Geoscience,2013-01-01,6(10)
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