How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot

Increasingly, spatial geochemical zonation, present as geographically distinct, subparallel trends, is observed along hotspot tracks, such as Hawaii and the Galapagos. The origin of this zonation is currently unclear. Recently zonation was found along the last ∼70 Myr of the Tristan-Gough hotspot tr...

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Autores principales: Hoernle, Kaj, Rohde, Joana, Hauff, Folkmar, Garbe-Schönberg, Dieter, Homrighausen, Stephan, Werner, Reinhard, Morgan, Jason P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525177/
https://www.ncbi.nlm.nih.gov/pubmed/26213112
http://dx.doi.org/10.1038/ncomms8799
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author Hoernle, Kaj
Rohde, Joana
Hauff, Folkmar
Garbe-Schönberg, Dieter
Homrighausen, Stephan
Werner, Reinhard
Morgan, Jason P.
author_facet Hoernle, Kaj
Rohde, Joana
Hauff, Folkmar
Garbe-Schönberg, Dieter
Homrighausen, Stephan
Werner, Reinhard
Morgan, Jason P.
author_sort Hoernle, Kaj
collection PubMed
description Increasingly, spatial geochemical zonation, present as geographically distinct, subparallel trends, is observed along hotspot tracks, such as Hawaii and the Galapagos. The origin of this zonation is currently unclear. Recently zonation was found along the last ∼70 Myr of the Tristan-Gough hotspot track. Here we present new Sr–Nd–Pb–Hf isotope data from the older parts of this hotspot track (Walvis Ridge and Rio Grande Rise) and re-evaluate published data from the Etendeka and Parana flood basalts erupted at the initiation of the hotspot track. We show that only the enriched Gough, but not the less-enriched Tristan, component is present in the earlier (70–132 Ma) history of the hotspot. Here we present a model that can explain the temporal evolution and origin of plume zonation for both the Tristan-Gough and Hawaiian hotspots, two end member types of zoned plumes, through processes taking place in the plume sources at the base of the lower mantle.
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spelling pubmed-45251772015-09-04 How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot Hoernle, Kaj Rohde, Joana Hauff, Folkmar Garbe-Schönberg, Dieter Homrighausen, Stephan Werner, Reinhard Morgan, Jason P. Nat Commun Article Increasingly, spatial geochemical zonation, present as geographically distinct, subparallel trends, is observed along hotspot tracks, such as Hawaii and the Galapagos. The origin of this zonation is currently unclear. Recently zonation was found along the last ∼70 Myr of the Tristan-Gough hotspot track. Here we present new Sr–Nd–Pb–Hf isotope data from the older parts of this hotspot track (Walvis Ridge and Rio Grande Rise) and re-evaluate published data from the Etendeka and Parana flood basalts erupted at the initiation of the hotspot track. We show that only the enriched Gough, but not the less-enriched Tristan, component is present in the earlier (70–132 Ma) history of the hotspot. Here we present a model that can explain the temporal evolution and origin of plume zonation for both the Tristan-Gough and Hawaiian hotspots, two end member types of zoned plumes, through processes taking place in the plume sources at the base of the lower mantle. Nature Pub. Group 2015-07-27 /pmc/articles/PMC4525177/ /pubmed/26213112 http://dx.doi.org/10.1038/ncomms8799 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Hoernle, Kaj
Rohde, Joana
Hauff, Folkmar
Garbe-Schönberg, Dieter
Homrighausen, Stephan
Werner, Reinhard
Morgan, Jason P.
How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot
title How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot
title_full How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot
title_fullStr How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot
title_full_unstemmed How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot
title_short How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot
title_sort how and when plume zonation appeared during the 132 myr evolution of the tristan hotspot
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4525177/
https://www.ncbi.nlm.nih.gov/pubmed/26213112
http://dx.doi.org/10.1038/ncomms8799
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