气候变化领域集成服务门户(CCPortal): Is There a Global Carbonate Layer in the Oceanic Mantle?

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DOI	10.1029/2020GL089752
	Is There a Global Carbonate Layer in the Oceanic Mantle?
	Hammouda T.; Manthilake G.; Goncalves P.; Chantel J.; Guignard J.; Crichton W.; Gaillard F.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	Previous modeling of carbonate subduction by high-pressure experimentation has allowed to propose scenarios for bulk carbon return to the mantle, but the detailed transfer mechanisms have seldom been studied. We monitored carbonate–silicate reactions by combining high-pressure experiments and synchrotron-based X-ray diffraction. Carbonates break down at moderate pressure and high temperature and CO2 is trapped at grain boundaries. Further isothermal compression yields melting, which may control continuous carbon introduction, first in the mantle wedge, and next, away from the wedge. Carbon presence has been discussed in a variety of magmatic contexts, under the oceanic lithosphere (hotspots, petit spots, and fossil ridges). We suggest the presence of a global carbon-rich layer under the oceanic lithosphere that is steadily fed by subduction processes. This layer can be the source of mechanical weakening of the lithosphere–asthenosphere boundary under the oceans. Therefore, carbon-induced compression melting may be a key mechanism of modern-style plate tectonics. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Carbonation; Grain boundaries; Melting; Silicates; Structural geology; Carbon-rich layers; High-pressure experiment; Isothermal compressions; Mechanical weakening; Moderate pressures; Oceanic lithosphere; Subduction process; Transfer mechanisms; Carbon
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169195
作者单位	Laboratoire Magmas et Volcans, Université Clermont-Auvergne, Aubière, France; Chrono-environnement - UMR 6249, Université de Bourgogne Franche-Comté, France; Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH, United States; Now at Unité Matériaux et Transformations, Université Lille1, Villeneuve d'Ascq, France; Now at Géosciences Environnement Toulouse (GET), OMP-UPS-CNRS, Toulouse, France; ESRF, Grenoble, France; ISTO, Orléans Cedex 2, France
推荐引用方式 GB/T 7714	Hammouda T.,Manthilake G.,Goncalves P.,et al. Is There a Global Carbonate Layer in the Oceanic Mantle?[J],2021,48(2).
APA	Hammouda T..,Manthilake G..,Goncalves P..,Chantel J..,Guignard J..,...&Gaillard F..(2021).Is There a Global Carbonate Layer in the Oceanic Mantle?.Geophysical Research Letters,48(2).
MLA	Hammouda T.,et al."Is There a Global Carbonate Layer in the Oceanic Mantle?".Geophysical Research Letters 48.2(2021).