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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?. Science Advances, 6 (28). eaba0282. DOI 10.1126/sciadv.aba0282.
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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 |
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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 Magmatic and Hydrothermal Systems |
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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