Implications of a metal‐bearing chemical boundary layer in D″ for mantle dynamics

Michael Manga; Raymond Jeanloz

doi:10.1029/96gl03021

journal article Nov 01, 1996

Implications of a metal‐bearing chemical boundary layer in D″ for mantle dynamics

Michael Manga

Raymond Jeanloz

Geophysical Research Letters Vol. 23 No. 22 pp. 3091-3094 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/96gl03021

Abstract

At lower mantle conditions, the thermal conductivity of non‐metallic crystals is an order of magnitude lower than that of dense metallic minerals such as FeO, FeSi and Fe, which may be present in a chemical boundary layer at the base of the mantle. Because the core‐mantle boundary is nearly isothermal, variations in the thickness of a metal‐bearing layer induce lateral temperature variations of several hundred kelvin, which in turn affect the pattern of mantle convection. Upwellings should occur where the layer is thickest; the resulting stability of the metal + silicate layer with respect to the flow may also stabilize the pattern of mantle convection, and reduce its time‐dependence.

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Metrics

97

Citations

44

References

Details

Published: Nov 01, 1996
Vol/Issue: 23(22)
Pages: 3091-3094
License: View

Authors

Department of Earth and Planetary Science University of California Berkeley California USA

Cite This Article

Michael Manga, Raymond Jeanloz (1996). Implications of a metal‐bearing chemical boundary layer in D″ for mantle dynamics. Geophysical Research Letters, 23(22), 3091-3094. https://doi.org/10.1029/96gl03021

Implications of a metal‐bearing chemical boundary layer in D″ for mantle dynamics

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