DOI: 10.1038/s41561-021-00762-9
论文题名: A tree of Indo-African mantle plumes imaged by seismic tomography
作者: Tsekhmistrenko M. ; Sigloch K. ; Hosseini K. ; Barruol G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 8 起始页码: 612
结束页码: 619
语种: 英语
英文关键词: hot dry rock
; hot spot
; mantle plume
; seismic tomography
; seismic wave
; volcanism
; Africa
; Southern Ocean
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169823
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Tsekhmistrenko M.,Sigloch K.,Hosseini K.,et al. A tree of Indo-African mantle plumes imaged by seismic tomography[J]. Nature Geoscience,2021-01-01,14(8)