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Metastable superplumes and mantle compressibility

Tan, Eh and Gurnis, Michael (2005) Metastable superplumes and mantle compressibility. Geophysical Research Letters, 32 (20). Art. No. L20307. ISSN 0094-8276.

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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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Additional Information:© 2005 American Geophysical Union. Received 25 July 2005; accepted 19 September 2005; published 22 October 2005. We thank Don Helmberger for continuous discussion during the course of this work. This work has been supported by the National Science Foundation CSEDI program and represents Contribution number 9120 of the Division of Geological and Planetary Sciences, California Institute of Technology.
Group:Seismological Laboratory
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Subject Keywords:Seismology: Mantle; Tectonophysics: Dynamics: convection currents, and mantle plumes; Tectonophysics: Earth's interior: composition and state
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Caltech Division of Geological and Planetary Sciences9120
Record Number:CaltechAUTHORS:20121119-135002294
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Official Citation:Tan, E. and M. Gurnis (2005), Metastable superplumes and mantle compressibility, Geophys. Res. Lett., 32, L20307, doi:10.1029/2005GL024190.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35548
Deposited By: Jason Perez
Deposited On:19 Nov 2012 22:39
Last Modified:11 Jun 2015 12:59

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