气候变化领域集成服务门户(CCPortal): Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii

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DOI	10.1016/j.tecto.2021.228885
	Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii
	Simpson F.; Bahr K.
发表日期	2021
ISSN	00401951
卷号	812
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.
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
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208070
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
推荐引用方式 GB/T 7714	Simpson F.,Bahr K.. Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii[J],2021,812.
APA	Simpson F.,&Bahr K..(2021).Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii.Tectonophysics,812.
MLA	Simpson F.,et al."Geomagnetic evidence for a continuously connected plume conduit extending to at least the 660-km discontinuity below Hawaii".Tectonophysics 812(2021).