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DOI	10.1016/j.earscirev.2019.103073
	Generation of continental intraplate alkali basalts and implications for deep carbon cycle
	Xu R.; Liu Y.; Wang X.-C.; Foley S.F.; Zhang Y.; Yuan H.
发表日期	2020
ISSN	00128252
卷号	201
英文摘要	Although the deep recycling of carbon has been proposed to play a key role in producing intraplate magmatism, the question of how it controls or triggers mantle melting remains poorly understood. In addition, generation of incipient carbonated melts in the mantle and their subsequent reaction with the mantle are critical processes that can influence the geochemistry of intraplate basalts, but the details of such processes are also unclear. Here we present geochemical evidence for the existence of pervasive carbonate melt in the mantle source of Cenozoic continental intraplate highly alkali basalts (SiO2 < 45 wt%), which are volumetrically minor but widespread in eastern China. The primary magma compositions of these basalts cannot be explained by either partial melting of a single mantle source lithology or mixing of magmas derived from distinct mantle sources, but can be adequately explained by carbonate-fluxed melting of eclogite and subsequent reaction between silica-rich melts and peridotite that ultimately transformed the initial carbonated silica-rich melts into silica-undersaturated alkalic magmas. The source of the carbonate is in subducted eclogites associated with the Pacific plate, which stagnated in the mantle transition zone (MTZ). The spatial distribution of the alkali basalts is in accord with large-scale seismic low-velocity anomalies in the upper mantle above the MTZ. Similar scenarios in central-western Europe and eastern Australia lead us to propose that reaction between carbonated silica-rich melt and peridotite may be a pivotal mechanism for the generation of continental intraplate alkali basalts elsewhere in the world. © 2019 Elsevier B.V.
关键词	Alkali basalt Carbonate-fluxed melting Eastern China Mantle transition zone Melt-peridotite reaction
英文关键词	alkali basalt; carbon cycle; carbonate; Cenozoic; geochemistry; magma; mantle; partial melting; peridotite; transition zone; Australia; China; Europe
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203937
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; ARC Centre of Excellence for Core to Crust Fluid Systems, Department of Earth and Planetary Sciences, Macquarie University, North Ryde, New South Wales 2109, Australia; College of Oceanography, Hohai University, Nanjing, 210093, China; Geological Survey of Western Australia, Mineral House, 100 Plain Street, East Perth, Western Australia 6004, Australia; Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley, Perth, Western Australia 6009, Australia
推荐引用方式 GB/T 7714	Xu R.,Liu Y.,Wang X.-C.,et al. Generation of continental intraplate alkali basalts and implications for deep carbon cycle[J],2020,201.
APA	Xu R.,Liu Y.,Wang X.-C.,Foley S.F.,Zhang Y.,&Yuan H..(2020).Generation of continental intraplate alkali basalts and implications for deep carbon cycle.Earth Science Reviews,201.
MLA	Xu R.,et al."Generation of continental intraplate alkali basalts and implications for deep carbon cycle".Earth Science Reviews 201(2020).