Mantle plume and rift-related volcanism during the evolution of the Rio Grande Rise

The Rio Grande Rise in the western South Atlantic Ocean has been interpreted as either an oceanic plateau related to the Tristan-Gough mantle plume, or a fragment of detached continental crust. Here we present new major and trace element data for volcanic rocks from the western and eastern Rio Grand...

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Bibliographic Details
Published in:Communications Earth & Environment
Main Authors: Hoyer, Patrick A., Haase, Karsten M., Regelous, Marcel, O’Connor, John M., Homrighausen, Stephan, Geissler, Wolfram H., Jokat, Wilfried
Format: Article in Journal/Newspaper
Language:English
Published: 2022
Subjects:
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
name=SDG 14 - Life Below Water
Charcot
Gough
Mid-Atlantic Ridge
Tristan
South Atlantic Ocean
Online Access:https://research.vu.nl/en/publications/d6e68135-961c-40d5-96f6-b539f3bfda10
https://doi.org/10.1038/s43247-022-00349-1
https://hdl.handle.net/1871.1/d6e68135-961c-40d5-96f6-b539f3bfda10
http://www.scopus.com/inward/record.url?scp=85130436134&partnerID=8YFLogxK
http://www.scopus.com/inward/citedby.url?scp=85130436134&partnerID=8YFLogxK
Description
Summary:The Rio Grande Rise in the western South Atlantic Ocean has been interpreted as either an oceanic plateau related to the Tristan-Gough mantle plume, or a fragment of detached continental crust. Here we present new major and trace element data for volcanic rocks from the western and eastern Rio Grande Rise and the adjacent Jean Charcot Seamount Chain. The eastern Rio Grande Rise and older parts of the western Rio Grande Rise are comprised of tholeiitic basalt with moderately enriched trace element compositions and likely formed above the Tristan-Gough mantle plume close to the southern Mid-Atlantic Ridge. Younger alkalic lavas from the western Rio Grande Rise and the Jean Charcot Seamount Chain were formed by lower degrees of melting beneath thicker lithosphere in an intraplate setting possibly during rifting of the plateau. There is no clear geochemical evidence that remnants of continental crust are present beneath the Rio Grande Rise.

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