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

@article{Bourdon2006InsightsIT,
  title={Insights into the dynamics of mantle plumes from uranium-series geochemistry},
  author={Bernard Bourdon and Neil M. Ribe and Andreas Stracke and Alberto E Saal and Simon Turner},
  journal={Nature},
  year={2006},
  volume={444},
  pages={713-717}
}
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… Expand

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References

SHOWING 1-10 OF 46 REFERENCES
Seismic structure of the Iceland mantle plume
Oceanic hotspots are generally accepted to be the manifestations of plumes of hot, upwelling mantle material1,2, but the nature of such flows remains enigmatic. Iceland, for example, is one of theExpand
The excess temperature of plumes rising from the core‐mantle boundary
We study the rise of conduit-type thermal plumes from the core-mantle boundary (CMB) in a simplified numerical model. Viscosity is a strong function of temperature and pressure. Assuming that allExpand
Mantle flow, melting, and dehydration of the Iceland mantle plume
Abstract Recent studies have shown that the extraction of water from the mantle due to partial melting beneath mid-ocean ridges may increase the viscosity of the residuum by 2–3 orders of magnitude.Expand
Hotspots and Mantle Plumes' Some Phenomenology
The available data, mainly topography, geoid, and heat flow, describing hotspots worldwide are examined to constrain the mechanisms for swell uplift and to obtain fluxes and excess temperatures ofExpand
Excess temperature of mantle plumes: The role of chemical stratification across D″
The temperature increase across the thermal boundary layer at the base of the Earth's mantle (D″) may be as high as 1000–1300°C, while the excess temperature of mantle plumes, inferred fromExpand
The importance of water to oceanic mantle melting regimes
TLDR
Two quantitative models of ridge melting, mixing and fractionation are extended to show that the addition of water can cause an increase in total melt production and crustal thickness while causing a decrease in mean extent of melting. Expand
Finite-Frequency Tomography Reveals a Variety of Plumes in the Mantle
We present tomographic evidence for the existence of deep-mantle thermal convection plumes. P-wave velocity images show at least six well-resolved plumes that extend into the lowermost mantle:Expand
Fluxes and excess temperatures of mantle plumes inferred from their interaction with migrating mid-ocean ridges
The behaviour of thermal plumes in the Earth's upper mantle is strongly affected by their interaction with nearby mid-ocean ridges. The magnitude of the buoyant topography and the length of theExpand
Three distinct types of hotspots in the Earth's mantle
The origin of mantle hotspots is a controversial topic. Only seven (‘primary’) out of 49 hotspots meet criteria aimed at detecting a very deep origin (three in the Pacific, four in the Indo-AtlanticExpand
Mechanisms of Magma Generation Beneath Hawaii and Mid-Ocean Ridges: Uranium/Thorium and Samarium/Neodymium Isotopic Evidence
TLDR
Midocean ridge basalts shows a systematic but much different relation between uranium/thorium fractionation and samarium/neodymium fractionations, which, although broadly consistent with melting of a garnet-bearing peridotite source, requires a more complex melting model. Expand
...
1
2
3
4
5
...