气候变化领域集成服务门户(CCPortal): Large-scale flow of Indian Ocean asthenosphere driven by Réunion plume

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DOI	10.1038/s41561-019-0479-3
	Large-scale flow of Indian Ocean asthenosphere driven by Réunion plume
	Barruol G.; Sigloch K.; Scholz J.-R.; Mazzullo A.; Stutzmann E.; Montagner J.-P.; Kiselev S.; Fontaine F.R.; Michon L.; Deplus C.; Dyment J.
发表日期	2019
ISSN	17520894
卷号	12 期号:12
英文摘要	Volcanic hotspot islands are thought to be surface manifestations of mantle plumes that rise from the core–mantle boundary. When mantle plumes approach the surface, their mostly vertical rise must be deflected into near-horizontal flow beneath tectonic plates. This creates an opportunity to constrain their dynamics and their interactions with lithospheric plates and mid-ocean ridges. Seafloor observations have been used to propose that a focused flow in the asthenosphere transports plume heat to the nearest mid-ocean ridge, where it efficiently dissipates through formation of lithosphere. Here we present imaging results from a seismological survey of a proposed plume-to-ridge flow channel between the Réunion hotspot and the Central Indian Ridge. Rayleigh-wave tomography and shear-wave splitting confirm the presence of a channelized flow of shallow asthenosphere, eastward from the hotspot to the spreading ridge. At a larger scale, a deeper reservoir of hot asthenosphere fills vast tracts of the Indian Ocean basin east and north of Réunion Island. Its flows, decoupled from overlying lithospheres, are also directed towards the Central Indian Ridge but extend well beyond, tapped but not significantly depleted by the spreading ridge. Based on seismic and geochemical observations, we suggest that this hidden heat reservoir is generated and driven by the mantle plume, which buffers more heat near the surface than expected. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	asthenosphere; core-mantle boundary; hot spot; mantle plume; mid-ocean ridge; Rayleigh wave; S-wave; seafloor; tectonic plate; volcanic island; Central Indian Ridge; Indian Ocean; Indian Ocean; Mascarene Islands; Mid-Indian Ridge; Reunion
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/124555
作者单位	Université de Paris, Institut de Physique du Globe de Paris, CNRS, UMR 7154, Paris, France; Université de La Réunion, Laboratoire GéoSciences Réunion, Saint Denis, France; University of Oxford, Earth Sciences Department, Oxford, United Kingdom; Institute of Physics of the Earth, Moscow, Russian Federation
推荐引用方式 GB/T 7714	Barruol G.,Sigloch K.,Scholz J.-R.,et al. Large-scale flow of Indian Ocean asthenosphere driven by Réunion plume[J],2019,12(12).
APA	Barruol G..,Sigloch K..,Scholz J.-R..,Mazzullo A..,Stutzmann E..,...&Dyment J..(2019).Large-scale flow of Indian Ocean asthenosphere driven by Réunion plume.Nature Geoscience,12(12).
MLA	Barruol G.,et al."Large-scale flow of Indian Ocean asthenosphere driven by Réunion plume".Nature Geoscience 12.12(2019).