气候变化领域集成服务门户(CCPortal): The Evolution of Mantle Plumes in East Africa

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DOI	10.1029/2020JB019929
	The Evolution of Mantle Plumes in East Africa
	Chang S.-J.; Kendall E.; Davaille A.; Ferreira A.M.G.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	Global tomography models show a large low-velocity anomaly extending from the core-mantle boundary (CMB) beneath South Africa to the upper mantle in East Africa. Although it is believed that this anomaly is linked to mantle upwellings that control key surface features of the African continent, its origin and evolution are still debated. Here we assemble geochemical and seismological constraints along with information from new seismic analyses and geodynamic laboratory experiments to propose that presently there are at least two different plume heads beneath Afar and Kenya that originated at the CMB. A third plume between Kenya and Afar may have caused the Ethiopia-Yemen traps 30 Ma, now merging with the Afar plume. We infer that the Afar plume is presently detached from the CMB probably because of an interaction with the subducted Tethyan slab and that it is likely a dying plume. This may imply that rifts along the Main Ethiopian Rift would fail by the loss of thermal sources, which consequently hampers continental breakup. ©2020. The Authors.
英文关键词	East Africa; geochemistry; geodynamics; mantle plume; Tethyan slab; tomography
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187461
作者单位	Department of Geophysics, Kangwon National University, Chuncheon, South Korea; Department of Earth Sciences, University College London, London, United Kingdom; Laboratoire FAST, CNRS/Université Paris Sud, Orsay, France; CERIS, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
推荐引用方式 GB/T 7714	Chang S.-J.,Kendall E.,Davaille A.,et al. The Evolution of Mantle Plumes in East Africa[J],2020,125(12).
APA	Chang S.-J.,Kendall E.,Davaille A.,&Ferreira A.M.G..(2020).The Evolution of Mantle Plumes in East Africa.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Chang S.-J.,et al."The Evolution of Mantle Plumes in East Africa".Journal of Geophysical Research: Solid Earth 125.12(2020).