globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1827
论文题名:
Graphite formation by carbonate reduction during subduction
作者: Galvez M.E.; Beyssac O.; Martinez I.; Benzerara K.; Chaduteau C.; Malvoisin B.; Malavieille J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:6
起始页码: 473
结束页码: 477
语种: 英语
Scopus关键词: alpine environment ; carbon isotope ; carbonate ; graphite ; hydrothermal alteration ; low temperature ; mass balance ; Raman spectroscopy ; serpentinite ; stable isotope ; subduction zone ; volcanism ; wollastonite ; Corse ; France
英文摘要: Carbon is transported from Earth's surface into its interior at subduction zones. Carbonates in sediments overlying hydrothermally altered rocks (including serpentinites) within the subducted slab are the main carriers of this carbon. Part of the carbon is recycled back to the surface by volcanism, but some is transferred to the deep Earth. Redox transformations during shallow subduction control the transfer and long-term fate of carbon, but are poorly explored. Here we use carbon stable isotopes and Raman spectroscopy to analyse the reduction of carbonate in an exhumed serpentinite-sediment contact in Alpine Corsica, France. We find that highly crystalline graphite was formed during subduction metamorphism and was concentrated in the sediment, within a reaction zone in direct contact with the serpentinite. The graphite in this reaction zone has a carbon isotopic signature (δ13C) of up to 0.8±0. 1‰, similar to that of the original calcite that composed the sediments, and is texturally associated with the calcium-bearing mineral wollastonite that is also formed in the process. We use mass-balance calculations to show that about 9% of the total carbonaceous matter in the sedimentary unit results from complete calcite reduction in the reaction zone. We conclude that graphite formation, under reducing and low-temperature conditions, provides a mechanism to retain carbon in a subducting slab, aiding transport of carbon into the deeper Earth. © 2013 Macmillan Publishers Limited. All rights reserved.
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被引频次[WOS]:148   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106789
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: IMPMC, CNRS-UPMC-IRD UMR 7590, UPMC Campus Jussieu, 4 Place Jussieu, 75005 Paris, France; Géochimie des Isotopes Stables, IPGP, PRES Sorbonne Paris Cité, 1 Rue Jussieu, 75005 Paris, France; Laboratoire de Géologie, Département des Géosciences, ENS-CNRS, 24 Rue Lhomond, 75005 Paris, France; ISTerre, CNRS UMR 5275, Université Grenoble i, BP 53, 38041 Grenoble CEDEX 9, France; Géosciences Montpellier, UMR 5243, CNRS-Université Montpellier II, 34095 Montpellier CEDEX 05, France; Carnegie Institution OfWashington, Geophysical Laboratory, 5251 Broad Branch Road NW, Washington, DC 20015, United States

Recommended Citation:
Galvez M.E.,Beyssac O.,Martinez I.,et al. Graphite formation by carbonate reduction during subduction[J]. Nature Geoscience,2013-01-01,6(6)
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