Paired EMI-HIMU hotspots in the South Atlantic-Starting plume heads trigger compositionally distinct secondary plumes?.

Homrighausen, Stephan, Hoernle, Kaj , Zhou, Hongpu , Geldmacher, Jörg , Wartho, Jo-Anne , Hauff, Folkmar , Werner, Reinhard, Jung, S. and Morgan, Jason P. (2020) Paired EMI-HIMU hotspots in the South Atlantic-Starting plume heads trigger compositionally distinct secondary plumes?. Open Access Science Advances, 6 (28). eaba0282. DOI 10.1126/sciadv.aba0282.

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Supplementary data:

Abstract

Age-progressive volcanism is generally accepted as the surface expression of deep-rooted mantle plumes, which are enigmatically linked with the African and Pacific large low-shear velocity provinces (LLSVPs). We present geochemical and geochronological data collected from the oldest portions of the age-progressive enriched mantle one (EMI)-type Tristan-Gough track. They are part of a 30- to 40-million year younger age-progressive hotspot track with St. Helena HIMU (high time-integrated U-238/Pb-204) composition, which is also observed at the EMI-type Shona hotspot track in the southernmost Atlantic. Whereas the primary EMI-type hotspots overlie the margin of the African LLSVP, the HIMU-type hotspots are located above a central portion of the African LLSVP, reflecting a large-scale geochemical zonation. We propose that extraction of large volumes of EMI-type mantle from the margin of the LLSVP by primary plume heads triggered upwelling of HIMU material from a more internal domain of the LLSVP, forming secondary plumes.

Document Type: Article
Keywords: VELOCITY PROVINCES; OCEANIC-CRUST; MANTLE PLUMES; GROUP-I; KIMBERLITES; GEOCHEMISTRY; BASALTS; GEOCHRONOLOGY; VOLCANISM; CHEMISTRY
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
Open Access Journal?: Yes
Publisher: AAAS (American Association for the Advancement of Science)
Expeditions/Models/Experiments:
Date Deposited: 31 Jul 2020 08:17
Last Modified: 08 Feb 2023 09:40
URI: https://oceanrep.geomar.de/id/eprint/50237

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