Metastable superplumes and mantle compressibility

Details Metastable superplumes and mantle compressibility Metastable superplumes and mantle compressibility

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220307t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 20, CiteID L20307

Physics

31

Seismology: Mantle (1212, 1213, 8124), Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

Seismically, the African superplume is known to have a sharp lateral transition in VS and an interface between seismic anomalies with high relief. Such a structure is usually unstable in conventional thermo-chemical convection models. Using a compressible thermo-chemical convection model in which each material has a distinct equation of state, we find an expanded regime of metastable superplumes. In the preferred model, superplume material has a bulk modulus 6% higher and density 2.25% higher than ambient mantle. The inferred physical properties of the superplume are consistent with subducted oceanic crust, simultaneously satisfying seismological, geodynamical, mineralogical and geochemical constraints.

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