Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites

@article{Herzberg2007TemperaturesIA,
  title={Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites},
  author={Claude T. Herzberg and Paul D. Asimow and Nicholas T. Arndt and Y. Niu and C. Michael Lesher and J. Godfrey Fitton and Michael J. Cheadle and Ad D. Saunders},
  journal={Geochemistry},
  year={2007},
  volume={8}
}
Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e., TP) of ambient mantle below oceanic ridges is 1430°C, the same as Hawaii. Another has ridges with a large range in ambient mantle potential temperature (i.e., TP = 1300–1570°C), comparable in some cases to hot spots (Klein and Langmuir, 1987… 

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References

SHOWING 1-10 OF 170 REFERENCES

Petrology and thermal structure of the Hawaiian plume from Mauna Kea volcano

Samples in the Hawaiian core are consistent with previous suggestions that pyroxenite occurs in a host peridotite, and both contribute to melt production, and reveal evidence for temperature variations within the underlying mantle plume.

Partial Crystallization of Mid-Ocean Ridge Basalts in the Crust and Mantle

Pressures at which partial crystallization occurs for mid-ocean ridge basalts (MORB) have been examined by a new petrological method that is based on a parameterization of experimental data in the

Mantle potential temperatures at Hawaii, Iceland, and the mid‐ocean ridge system, as inferred from olivine phenocrysts: Evidence for thermally driven mantle plumes

Temperature differences between lavas erupted at ocean islands and mid‐ocean ridges are crucial to documenting the existence of mantle plumes. Olivines are useful for T estimation because they

Primary magmas of mid-ocean ridge basalts 2. Applications

Variable initial mantle composition and extent of depletion during dynamic melting processes strongly influence compositions of primary basaltic magmas. The descriptions of the equilibria that

Volatiles in Basaltic Glasses from Loihi Seamount, Hawaii: Evidence for a Relatively Dry Plume Component

New H2O, CO2 and S concentration data for basaltic glasses from ‘hotspot’, with temperature differences of 200°C or more between hotter upwelling plumes and the ambient mantle Loihi seamount, Hawaii,

The thermal state of the upper mantle; No role for mantle plumes

A variety of geophysical data indicates that long wavelength temperature variations of the asthenosphere depart from the mean by ±200°C, not the ±20°C adopted by plume theoreticians. The ‘normal’

Kistufell: Primitive Melt from the Iceland Mantle Plume

This paper presents new geochemical data from Kistufell (64°48′N, INTRODUCTION 17°13′W), a monogenetic table mountain situated directly above Iceland is the surface manifestation of a plume of

Multiple volcanic episodes of flood basalts caused by thermochemical mantle plumes

Numerical experiments are presented to demonstrate that the entrainment of a dense eclogite-derived material at the base of the mantle by thermal plumes can develop secondary instabilities due to the interaction between thermal and compositional buoyancy forces.
...