气候变化领域集成服务门户(CCPortal): Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids

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DOI	10.1038/s41561-023-01127-0
	Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids
	Padron-Navarta, Jose Alberto; Lopez Sanchez-Vizcaino, Vicente; Menzel, Manuel D.; Gomez-Pugnaire, Maria Teresa; Garrido, Carlos J.
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	268
结束页码	+
卷号	16 期号:3 页码:19
英文摘要	High-pressure dehydration of serpentinite during subduction generates fluids that flux and melt the overlying mantle wedge, forming primary arc basalts. These basalts are substantially more oxidized than their mid-ocean ridge counterparts. At the slab surface of current subduction zones, these deserpentinization fluids are intrinsically oxidized, but, owing to the low sulfur content of subducted serpentinite, they only result in a low mantle wedge oxidation rate, which cannot account for the oxidized source of arc basalts. Here we show that infiltration of sediment-derived fluids modulates and can drastically change the oxidation capacity of deserpentinization slab fluids. The modulation of the deserpentinization oxidation capacity mostly depends on the stability and abundance of dissolved oxidized aqueous species of redox-sensitive elements-notably sulfate-and not solely on the oxidation state of the sediment. Infiltration of CH4-bearing fluids derived from graphite-bearing sediment reduces the intrinsically high oxidant capacity of deserpentinization fluids, explaining the relatively low fO(2) observed in natural metaperidotite. Infiltration of sulfate-CO2-bearing, sediment-derived fluids-prevalent in modern subduction zones-generates deserpentinization fluids with a high oxidation capacity in cold and hot subduction zones, resulting in a global mantle wedge oxidation rate of 3.5 km(3) yr(-1). Such slab fluids will oxidize the mantle wedge at a rate similar to that of arc-basalt generation and thus account for the oxidized nature of arc volcanism. The source of highly oxidized arc magmas may rely on the infiltration of sediment-derived fluids that contain oxidized aqueous species-notably sulfate-into deserpentinization fluids, according to thermodynamic modelling.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000942760500001
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272446
作者单位	Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto Andaluz de Ciencias de la Tierra (IACT); Universite de Montpellier; Centre National de la Recherche Scientifique (CNRS); Consejo Superior de Investigaciones Cientificas (CSIC); Universidad de Jaen; University of Granada
推荐引用方式 GB/T 7714	Padron-Navarta, Jose Alberto,Lopez Sanchez-Vizcaino, Vicente,Menzel, Manuel D.,et al. Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids[J],2023,16(3):19.
APA	Padron-Navarta, Jose Alberto,Lopez Sanchez-Vizcaino, Vicente,Menzel, Manuel D.,Gomez-Pugnaire, Maria Teresa,&Garrido, Carlos J..(2023).Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids.NATURE GEOSCIENCE,16(3),19.
MLA	Padron-Navarta, Jose Alberto,et al."Mantle wedge oxidation from deserpentinization modulated by sediment-derived fluids".NATURE GEOSCIENCE 16.3(2023):19.