气候变化领域集成服务门户(CCPortal): Massive carbon storage in convergent margins initiated by subduction of limestone

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DOI	10.1038/s41467-021-24750-0
	Massive carbon storage in convergent margins initiated by subduction of limestone
	Chen C.; Förster M.W.; Foley S.F.; Liu Y.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Remobilization of sedimentary carbonate in subduction zones modulates arc volcanism emissions and thus Earth’s climate over geological timescales. Although limestones (or chalk) are thought to be the major carbon reservoir subducted to subarc depths, their fate is still unclear. Here we present high-pressure reaction experiments between impure limestone (7.4 wt.% clay) and dunite at 1.3–2.7 GPa to constrain the melting behaviour of subducted natural limestone in contact with peridotite. The results show that although clay impurities significantly depress the solidus of limestone, melting will not occur whilst limestones are still part of the subducting slab. Buoyancy calculations suggest that most of these limestones would form solid-state diapirs intruding into the mantle wedge, resulting in limited carbon flux to the deep mantle (< ~10 Mt C y−1). Less than 20% melting within the mantle wedge indicates that most limestones remain stable and are stored in subarc lithosphere, resulting in massive carbon storage in convergent margins considering their high carbon flux (~21.4 Mt C y−1). Assimilation and outgassing of these carbonates during arc magma ascent may dominate the carbon flux in volcanic arcs. © 2021, The Author(s).
语种	英语
scopus关键词	carbonic acid; carbonic acid derivative; limestone; carbon flux; carbon storage; convergent margin; limestone; magma; mantle; reservoir; subduction zone; Article; carbon storage; chemical composition; controlled study; lithosphere; rock; sediment; solid state; temperature
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251380
作者单位	Department of Earth and Environmental Sciences and ARC Centre of Excellence for Core to Crust Fluid Systems, Macquarie University, North Ryde, NSW, Australia; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, China; Research School of Earth Sciences, Australia National University, Canberra, ACT, Australia
推荐引用方式 GB/T 7714	Chen C.,Förster M.W.,Foley S.F.,et al. Massive carbon storage in convergent margins initiated by subduction of limestone[J],2021,12(1).
APA	Chen C.,Förster M.W.,Foley S.F.,&Liu Y..(2021).Massive carbon storage in convergent margins initiated by subduction of limestone.Nature Communications,12(1).
MLA	Chen C.,et al."Massive carbon storage in convergent margins initiated by subduction of limestone".Nature Communications 12.1(2021).