气候变化领域集成服务门户(CCPortal): Dynamics of a chemically pulsing mantle plume

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DOI	10.1016/j.epsl.2020.116182
	Dynamics of a chemically pulsing mantle plume
	Taylor R.N.; Davila-Harris P.; Branney M.J.; Ruth Farley E.M.; Gernon T.M.; Palmer M.R.
发表日期	2020
ISSN	0012821X
卷号	537
英文摘要	Upwelling plumes from the deep mantle have an impact on the Earth's surface for tens to hundreds of millions of years. During the lifetime of a mantle plume, periodic fluctuations in its composition and temperature have the potential to generate changes in the nature and volume of surface volcanism. We constrain the spatial and temporal scale of compositional changes in a plume using high-resolution Pb isotopes, which identify chemical pulses emerging from the Canary Islands hotspot over the last ∼15 million years (Myr). Surface volcanism spanning ∼ 400 km along the island chain changes composition systematically and synchronously, representing a replenishment of the plume head by a distinct mantle flavour on timescales of 3-5 Myr. These low-frequency compositional changes are also recorded by individual volcanoes, and comprise a sequence of closely-spaced isotopic trajectories. Each trajectory is maintained for ∼1 Myr and is preceded and followed by ∼0.3 Myr transitions to magmas with distinct isotope ratios. Relatively sharp transitions between periods of sustained isotopic stability require discrete yet coherent heterogeneities rising at speeds of ∼100-200 km Myr−1 and extending for ∼150 km vertically in the conduit. The long-term synchronous changes require larger scale isotopic domains extending ∼600 km vertically through in the plume stem. These observations demonstrate that plumes can chemically “pulse” over short and long-timescales reflecting the characteristics and recycling history of the deep mantle. © 2020 Elsevier B.V.
关键词	Canary Islands geochemistry magmatic evolution mantle plume Pb isotopes temporal and spatial volcanism Tenerife
英文关键词	Geochemistry; Thermal plumes; Canary islands; Magmatic evolution; Mantle plume; Pb isotopes; Temporal and spatial; Tenerife; Isotopes; chemical composition; geochemistry; lead isotope; magma; magmatism; mantle plume; volcanism; Canary Islands; Santa Cruz de Tenerife [(PRV) Canary Islands]; Spain; Tenerife
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202929
作者单位	School of Ocean and Earth Science, University of Southampton, Waterfront Campus, Southampton, SO14 3ZH, United Kingdom; Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí, Mexico; Department of Geography, Geology and the Environment, University of Leicester, United Kingdom
推荐引用方式 GB/T 7714	Taylor R.N.,Davila-Harris P.,Branney M.J.,et al. Dynamics of a chemically pulsing mantle plume[J],2020,537.
APA	Taylor R.N.,Davila-Harris P.,Branney M.J.,Ruth Farley E.M.,Gernon T.M.,&Palmer M.R..(2020).Dynamics of a chemically pulsing mantle plume.Earth and Planetary Science Letters,537.
MLA	Taylor R.N.,et al."Dynamics of a chemically pulsing mantle plume".Earth and Planetary Science Letters 537(2020).