DOI: 10.1038/ngeo2281
论文题名: A continuous 55-million-year record of transient mantle plume activity beneath Iceland
作者: Parnell-Turner R. ; White N. ; Henstock T. ; Murton B. ; Maclennan J. ; Jones S.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 12 起始页码: 914
结束页码: 919
语种: 英语
Scopus关键词: core-mantle boundary
; mantle plume
; mid-ocean ridge
; oceanic crust
; seismic reflection
; solitary wave
; upwelling
; Atlantic Ocean
; Atlantic Ocean (North)
; Iceland
英文摘要: In the North Atlantic Ocean, a mid-ocean ridge bisects the Icelandic mantle plume, and provides a window into its temporal evolution. V-shaped ridges of thick oceanic crust observed south of Iceland are thought to record pulses of upwelling within the plume. Specifically, excess crust is thought to form during the quasi-periodic generation of hot solitary waves triggered by thermal instabilities in the mantle. Here we use seismic reflection data to show that V-shaped ridges have formed over the past 55 million years - providing the longest record of plume periodicity of its kind. We find evidence for minor, but systematic, asymmetric formation of crust, due to migration of the mid-ocean ridge with respect to the underlying plume. We also find changes in periodicity: from 55 to 35 million years ago, the V-shaped ridges form every 3 million years or so and reflect small fluctuations in plume temperature of about 5-10 °C. From 35 million years ago, the periodicity changes to about 8 million years and reflects changes in mantle temperature of 25-30 °C. We suggest that this change in periodicity is probably caused by perturbations in the thermal state at the plume source, either at the mantle-transition zone or core-mantle boundary. © 2014 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106505
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; National Oceanography Centre Southampton, University of Southampton, European Way, Southampton, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Birmingham, United Kingdom
Recommended Citation:
Parnell-Turner R.,White N.,Henstock T.,et al. A continuous 55-million-year record of transient mantle plume activity beneath Iceland[J]. Nature Geoscience,2014-01-01,7(12)