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 and Morgan, Jason P. (2015) How and when plume zonation appeared during the 132 Myr evolution of the Tristan Hotspot Nature Communications, 6 (7799). DOI 10.1038/ncomms8799.

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Abstract

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 B70 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.

Document Type: Article
Keywords: Walvis Ridge, Tristan Hotspot, Mantle Plumes, Mantle Plume Zonation, Mantle Plume Evolution, Geochemistry, Sr-Nd-Pb-Hf Isotope Geochemistry
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Kiel University
Refereed: Yes
DOI etc.: 10.1038/ncomms8799
ISSN: 2041-1723
Projects: WALVIS II, WALVIS I, SAMPLE, Future Ocean
Expeditions/Models:
Date Deposited: 31 Jul 2015 10:11
Last Modified: 19 Dec 2017 12:48
URI: http://eprints.uni-kiel.de/id/eprint/29325

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