globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228885
论文题名:
Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii
作者: Simpson F.; Bahr K.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 812
语种: 英语
中文关键词: 660-km discontinuity ; Current-channelling ; Hawaiian hotspot ; Magnetic daily variation ; Mantle plume ; Secular variation
英文关键词: Electric connectors ; Continuous features ; Core-mantle boundary ; Electrical connection ; Geomagnetic data ; Mantle discontinuities ; Mantle transition zone ; Novel techniques ; Secular variation ; Geomagnetism ; core-mantle boundary ; discontinuity ; diurnal variation ; geomagnetism ; mantle plume ; quantitative analysis ; secular variation ; Hawaii [United States] ; United States
英文摘要: Do plumes exist? If so, do plume tails connect hotspots to the core-mantle boundary (CMB), or only to the 660-km discontinuity (between the upper and the lower mantle)? Are they continuous or fragmented? Here, we demonstrate quantitatively that the Hawaiian plume distorts 24-h-period magnetovariational data by providing a continuous electrical connection between the Earth's surface (via the ocean) and the 660-km mid-mantle discontinuity. We extend our analysis to predict how a plume ascending from the CMB should distort magnetic secular variation observed locally at the surface. Hence, the Hawaiian plume is demonstrated to be a continuous feature with a deep-seated (at least mid-mantle) source. Our analysis provides a novel technique for determining whether the Hawaiian plume originates at the mid-mantle transition zone or CMB subject to magnetic secular variation data being acquired locally, as well as allowing the depth of genesis of other mantle plumes to be constrained should further geomagnetic data become available in their vicinity. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170903
Appears in Collections:气候变化与战略

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作者单位: School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton, SO14 3ZH, United Kingdom; Institut für Geophysik, Universität Göttingen, Friedrich-Hund-Platz 137077, Germany

Recommended Citation:
Simpson F.,Bahr K.. Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii[J]. Tectonophysics,2021-01-01,812
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