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  The Evolution of Mantle Plumes in East Africa

Chang, S., 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, e2020JB019929.
https://doi.org/10.1029/2020JB019929

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007693 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007693_1
Genre: Journal Article

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 Creators:
Chang, Sung‐Joon1, Author
Kendall, Elodie2, Author              
Davaille, Anne1, Author
Ferreira, Ana M. G.1, Author
Affiliations:
1External Organizations, ou_persistent22              
20 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2020-11-282020
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1029/2020JB019929
 Degree: -

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Title: Journal of Geophysical Research: Solid Earth
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 125 (12) Sequence Number: e2020JB019929 Start / End Page: - Identifier: ISSN: 2169-9313
ISSN: 2169-9356
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_solid_earth
Publisher: American Geophysical Union (AGU)