Insights into the dynamics of mantle plumes from uranium-series geochemistry

Bernard Bourdon (), Neil M. Ribe, Andreas Stracke, Alberto E. Saal and Simon P. Turner
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Bernard Bourdon: Institut de Physique du Globe de Paris-CNRS
Neil M. Ribe: Institut de Physique du Globe de Paris-CNRS
Andreas Stracke: Max-Planck-Institut für Chemie, Abteilung Geochemie
Alberto E. Saal: Brown University
Simon P. Turner: Macquarie University

Nature, 2006, vol. 444, issue 7120, 713-717

Abstract: Abstract The long-standing paradigm that hotspot volcanoes such as Hawaii or Iceland represent the surface expression of mantle plumes—hot, buoyant upwelling regions beneath the Earth’s lithosphere—has recently been the focus of controversy. Whether mantle plumes exist or not is pivotal for our understanding of the thermal, dynamic and compositional evolution of the Earth’s mantle. Here we show that uranium-series disequilibria measured in hotspot lavas indicate that hotspots are indeed associated with hot and buoyant upwellings and that weaker (low buoyancy flux) hotspots such as Iceland and the Azores are characterized by lower excess temperatures than stronger hotspots such as Hawaii. This direct link between buoyancy flux and mantle temperature is evidence for the existence of mantle plumes.

Date: 2006
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DOI: 10.1038/nature05341

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