气候变化领域集成服务门户(CCPortal): A tree of Indo-African mantle plumes imaged by seismic tomography

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DOI	10.1038/s41561-021-00762-9
	A tree of Indo-African mantle plumes imaged by seismic tomography
	Tsekhmistrenko M.; Sigloch K.; Hosseini K.; Barruol G.
发表日期	2021
ISSN	17520894
起始页码	612
结束页码	619
卷号	14 期号:8
英文摘要	Mantle plumes were conceived as thin, vertical conduits in which buoyant, hot rock from the lowermost mantle rises to Earth’s surface, manifesting as hotspot-type volcanism far from plate boundaries. Spatially correlated with hotspots are two vast provinces of slow seismic wave propagation in the lowermost mantle, probably representing the heat reservoirs that feed plumes. Imaging plume conduits has proved difficult because most are located beneath the non-instrumented oceans, and they may be thin. Here we combine new seismological datasets to resolve mantle upwelling across all depths and length scales, centred on Africa and the Indian and Southern oceans. Using seismic waves that sample the deepest mantle extensively, we show that mantle upwellings are arranged in a tree-like structure. From a central, compact trunk below ~1,500 km depth, three branches tilt outwards and up towards various Indo-Austral hotspots. We propose that each tilting branch represents an alignment of vertically rising blobs or proto-plumes, which detached in a linear staggered sequence from their underlying low-velocity corridor at the core–mantle boundary. Once a blob reaches the viscosity discontinuity between lower and upper mantle, it spawns a ‘classical’ plume-head/plume-tail sequence. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	hot dry rock; hot spot; mantle plume; seismic tomography; seismic wave; volcanism; Africa; Southern Ocean
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206967
作者单位	Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Geophysics Section, Dublin Institute of Advanced Studies, Dublin, Ireland; Université Côte d’Azur, Géoazur, CNRS, UMR 7329, Sophia Antipolis Cedex, France; The Alan Turing Institute, British Library, London, United Kingdom; Université de Paris, Institut de physique du globe de Paris, CNRS, UMR 7154, Paris, France
推荐引用方式 GB/T 7714	Tsekhmistrenko M.,Sigloch K.,Hosseini K.,et al. A tree of Indo-African mantle plumes imaged by seismic tomography[J],2021,14(8).
APA	Tsekhmistrenko M.,Sigloch K.,Hosseini K.,&Barruol G..(2021).A tree of Indo-African mantle plumes imaged by seismic tomography.Nature Geoscience,14(8).
MLA	Tsekhmistrenko M.,et al."A tree of Indo-African mantle plumes imaged by seismic tomography".Nature Geoscience 14.8(2021).