期刊
GEOPHYSICAL RESEARCH LETTERS
卷 32, 期 20, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL024190
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Seismically, the African superplume is known to have a sharp lateral transition in V-S 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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