DOI: 10.1016/j.epsl.2020.116324
论文题名: Fast magma ascent, revised estimates from the deglaciation of Iceland
作者: Rees Jones D.W. ; Rudge J.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 542 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165228
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Rees Jones D.W.,Rudge J.F.. Fast magma ascent, revised estimates from the deglaciation of Iceland[J]. Earth and Planetary Science Letters,2020-01-01,542