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DOI	10.1016/j.epsl.2020.116324
	Fast magma ascent, revised estimates from the deglaciation of Iceland
	Rees Jones D.W.; Rudge J.F.
发表日期	2020
ISSN	0012821X
卷号	542
英文摘要	Partial melting of asthenospheric mantle generates magma that supplies volcanic systems. The timescale of melt extraction from the mantle has been hotly debated. Microstructural measurements of permeability typically suggest relatively slow melt extraction (1 m/yr) whereas geochemical (Uranium-decay series) and geophysical observations suggest much faster melt extraction (100 m/yr). The deglaciation of Iceland triggered additional mantle melting and magma flux at the surface. The rapid response has been used to argue for relatively rapid melt extraction. However, this episode must, at least to some extent, be unrepresentative, because the rates of magma eruption at the surface increased about thirty-fold relative to the steady state. Our goal is to quantify this unrepresentativeness. We develop a one-dimensional, time-dependent and nonlinear (far from steady-state), model forced by the most recent, and best mapped, Icelandic deglaciation. We find that 30 m/yr is the best estimate of the steady-state maximum melt velocity. This is a factor of about 3 smaller than previously claimed, but still relatively fast. We translate these estimates to other mid-ocean ridges accounting for differences in passive and active upwelling and degree of melting. We find that fast melt extraction greater than about 10 m/yr prevails globally. © 2020 Elsevier B.V.
关键词	deglaciation Iceland magma migration magma velocity mid-ocean ridges
英文关键词	Melting; Best estimates; Geophysical observations; Melt extraction; Microstructural measurements; Mid-ocean ridges; Partial melting; Uranium decay series; Volcanic systems; Extraction; deglaciation; estimation method; magmatic differentiation; mantle source; mantle upwelling; partial melting; volcanic eruption; Iceland
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/202850
作者单位	University of Cambridge, Bullard Laboratories, Department of Earth Sciences, Madingley Road, Cambridge, CB3 0EZ, United Kingdom; University of St Andrews, School of Mathematics and Statistics, Mathematical Institute, North Haugh, St Andrews, KY16 9SS, United Kingdom
推荐引用方式 GB/T 7714	Rees Jones D.W.,Rudge J.F.. Fast magma ascent, revised estimates from the deglaciation of Iceland[J],2020,542.
APA	Rees Jones D.W.,&Rudge J.F..(2020).Fast magma ascent, revised estimates from the deglaciation of Iceland.Earth and Planetary Science Letters,542.
MLA	Rees Jones D.W.,et al."Fast magma ascent, revised estimates from the deglaciation of Iceland".Earth and Planetary Science Letters 542(2020).